Unit 2 Topic 3 (核心必背知识清单）-2025-2026学年九年级英语上册单元复习与检测（仁爱科普版）

Unit 2 Saving the Earth Unit 2 Topic 3 话题复习 1. 情境语篇过单词 中文翻译 校园环保周的难忘经历 上周，我们学校举办了“环保周”活动，还邀请了当地一家环保组织的工作人员来指导。活动第一天，他们给我们讲解了环境保护的重要性，还教我们如何回收利用垃圾 —— 比如将塑料袋、罐头盒和旧报纸分类，送到专门的回收点。 活动中，大家就“如何减少浪费”展开讨论：有人建议购物时用布袋代替塑料袋，有人提出离开教室要关掉电源。讨论后，我们达成一致，但也有小分歧—— 比如是否该禁止使用一次性电池。这时老师提醒：“毕竟环保需要循序渐进，不要急于求成，更不能放弃。” 第二天，环保专家来做讲座，他高度地评价了中国的环保技术，比如利用太阳能的龙羊峡水坝，以及不需要汽油的电动汽车。他还说，高速列车不仅噪音小（车厢内部几乎听不到车轮声），还能减少碳排放，是很好的环保出行方式。 最后一天，我们分组行动：有的去清理校园角落的垃圾，去除地面的油污；有的种植小树苗，取代枯死的灌木，还要小心防止昆虫叮咬。专家说，太阳能、风能等可再生能源是未来的重要来源，它们不会耗尽，能保护地球免受污染。 这次活动让我明白：环保不是口号，而是需要每个人用行动去践行。即使是短距离出行选择步行，也是对地球的一份贡献。 英语短文 An Unforgettable Experience of School Environmental Protection Week Last week, our school held an “Environmental Protection Week” and invited staff from a local environmental ____________ (1) to guide us. On the first day of the activity, they explained the importance of environmental ____________ (2) to us and taught us how to ____________ (3) waste — such as sorting ____________ (4) bags, ____________ (5) and old newspapers, and sending them to special recycling points. During the discussion about “how to reduce waste”, someone suggested using ____________ (6) bags instead of plastic bags when shopping, and someone proposed to ____________ (7) the ____________ (8) when leaving the classroom. After the discussion, we reached an ____________ (9), but there was also a small ____________ (10) — such as whether to ban disposable ____________ (11). At this time, the teacher reminded us: “____________ (12), environmental protection needs to be gradual. Don’t finish it in a ____________ (13), and never ____________ (14) up.” On the second day, an environmental ____________ (15) gave a lecture. He thought ____________ (16) of China’s environmental protection technologies, such as the Longyangxia _________ (17) which uses __________ (18) energy, and ____________ (19) cars that don’t need ____________(20). He also said that ____________ (21) trains not only have low noise (you can hardly hear the ____________ (22) sound ____________ (23) the carriage) but also reduce carbon emissions, making them a good eco-friendly travel method. On the last day, we took ____________ (24) in groups: some cleaned the garbage in the corners of the campus and ____________ (25) oil stains on the ground; some planted small saplings to ____________ (26) dead shrubs, and had to be careful to prevent ____________ (27) from ____________ (28). The expert said that ____________ (29) energy, wind energy and other ____________ (30) energy sources are important ____________ (31) for the future. They will never ______ (32) out and can ____________ (33) the earth from pollution. This activity made me understand that environmental protection is not a slogan but requires everyone to practice it with ____________ (34). Even choosing to walk for a short ____________ (35) is a contribution to the earth. 【答案】1. organization 2. protection 3. recycle 4. plastic 5. cans 6. cloth 7. shut off 8. electricity 9. agreement 10. disagreement 11. batteries 12. After all 13. hurry 14. give 15. expert 16. highly 17. dam 18. solar 19. electric 20. petrol 21. high-speed 22. wheel 23. inside 24. action 25. remove 26. replace 27. insects 28. biting 29. solar 30. renewable 31. sources 32. run 33. protect 34. action 35. distance 2. 易考词汇变形归纳梳理 原形 变形 protect (v. 保护) protection (n. 保护) organize (v. 组织) organization (n. 组织) agree (v. 同意) agreement (n. 同意) agree (v. 同意) disagreement (n. 分歧) electric (adj. 电动的) electricity (n. 电) high (adj. 高的) highly (adv. 高度地) renew (v. 更新) renewable (adj. 可再生的) act (v. 行动) action (n. 行动) use (v. 使用) reusable (adj. 可重复使用的) remove (v. 去除) removal (n. 去除) 2. 词汇变形综合检测 1.The government has set up a new ____________ (organize) to deal with plastic pollution. 2.We should take part in ____________ (protect) activities to save endangered animals. 3.After a long discussion, they finally reached an ____________ (agree) on reducing car use. 4.There was a small ____________ (disagree) among students about whether to use disposable chopsticks. 5.Saving ____________ (electric) by shutting off lights is a simple way to protect the environment. 6.Experts think ____________ (high) of China’s solar energy technology because it’s green and cheap. 7.We should use more ____________ (renew) energy like wind and sunlight to replace coal. 8.It’s important to take ____________ (act) instead of just talking about environmental protection. 9.This shop sells ____________ (reuse) bags to encourage customers to reduce plastic waste. 10.The ____________ (remove) of oil stains from the river will take about three months. 【答案】1.organization；2.protection；3.agreement；4.disagreement；5.electricity；6.highly；7.renewable；8.action；9.reusable；10.removal 1. 短语梳理 核心短语 中文含义 hurry up 赶快，快点 give up 放弃 shut off 停止，关掉 run out (of) 用完，耗尽 after all 毕竟；归根结底 instead of 代替；而不是 take action 采取行动 think highly of 高度评价 reduce, reuse and recycle 减少、重复使用和回收利用 sort out 分类；整理 短语综合检测 （1）单项选择 1.We must ______ the electricity when we leave the classroom. It’s a simple way to save energy. A. shut off B. run out C. give up D. think highly of 2.Experts ______ the solar energy project in Qinghai because it helps reduce pollution a lot. A. hurry up B. think highly of C. take action D. instead of （2）用方框中短语的适当形式填空，每词限用一次。 （hurry up, give up, shut off, run out, after all, instead of, take action） 3. ____________! The environmental lecture will start in five minutes. Don’t be late. 4. We should walk or ride bikes ____________ taking cars for short trips to reduce air pollution. 5. If we don’t ____________ to protect the river, its water will ____________ soon and fish will die. （3）句子翻译 6.回收利用废纸和罐头盒不仅能保护环境，还能节约资源。（reduce, reuse and recycle） _________________________________________________________________________________ 7.毕竟我们只有一个地球，所以不要放弃任何环保的机会。（after all, give up） _________________________________________________________________________________ 【答案】 1.A 2. B 3. Hurry up 4. instead of 5. take action; run out 6.Reducing, reusing and recycling waste paper and cans can not only protect the environment but also save resources. 7.After all, we have only one earth, so don’t give up any chance to protect the environment. 话题概述 本话题写作围绕“环保行动（个人 / 学校 / 社会）与可再生能源”展开： 1.介绍个人环保做法（如节约用电、用布袋购物、短距离步行）； 2.描述学校 / 社区环保活动（如环保周、垃圾分类、植树）； 3.说明可再生能源的优势（如太阳能、风能、电动汽车）； 4.呼吁他人参与环保（强调 “行动比语言重要”）。 【高分写作句型】角度1：描述 “环保行动及好处” 1. 课文例句 Recycling can protect the environment, and it can save money, too. Solar energy requires less coal and oil. It is a good way to protect our earth from pollution. 2. 仿写练习 行动：参与垃圾分类能减少垃圾量，还能让可回收物变废为宝。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】Taking part in garbage sorting can reduce waste, and it can turn recyclables into valuable resources too. 好处：步行或骑行代替开车能减少碳排放，是改善空气质量的有效方式。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】Walking or riding a bike instead of driving can reduce carbon emissions. It is an effective way to improve air quality. 2. 【高分写作句型】表达 “环保呼吁” 1. 课文例句 Actions speak louder than words. After all, we have only one earth. We should do everything to protect it. 2. 仿写练习 呼吁1：不要等环境恶化了才行动——毕竟我们只有一个家园。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】Don’t wait until the environment gets worse to take action. After all, we have only one home. 呼吁2：每个人都该为环保出一份力，否则我们的后代将无处栖身。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】Everyone should do their part for environmental protection, or our future generations will have nowhere to live. 3. 【高分写作句型】提出 “个人环保建议” 1. 课文例句 irst, you ought to shut off the electricity when you leave a room. Second, you’d better walk or ride a bike instead of taking a bus if you travel a short distance. 2. 仿写练习 建议1：离开家时，我们应该检查水龙头是否关紧以节约用水。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】When leaving home, we ought to check if the taps are turned off to save water. 建议2：购物时，最好自带保温杯而不是买一次性纸杯。 ____________________________________________________________________________________ ____________________________________________________________________________________ 【答案】When shopping, we’d better bring our own thermos cups instead of buying disposable paper cups. 话题写作剖析 书面表达 假设你校上周举办了 “环保周” 活动，请根据以下提示，写一篇 80-100 词的短文，介绍活动内容及你的收获。提示： 活动内容：环保讲座（专家讲可再生能源）、垃圾分类比赛、植树； 你的做法：参与垃圾分类，用零花钱买布袋送给邻居； 你的收获：环保要从小事做起，行动比语言重要。 要求： 1.条理清晰，语句通顺； 2.包含所有提示要点，可适当发挥； 3.文中不得出现真实人名、校名。 ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 【例文】 Our School’s Environmental Protection WeekLast week, our school held an “Environmental Protection Week” and it was very meaningful. On Monday, an environmental expert gave a lecture. He talked about renewable energy like solar energy and electric cars, which I found very interesting. On Wednesday, we had a garbage sorting competition. I joined it and learned how to sort plastic bags and cans. On Friday, we planted small trees in the school yard. I also did my part: I used my pocket money to buy cloth bags and gave them to my neighbors to help reduce plastic waste. This week taught me that environmental protection starts with small things. As the saying goes, “Actions speak louder than words.” We all need to act to protect our earth. 【例文分析】 （1）结构清晰 开头：用 “held an ‘Environmental Protection Week’” 总起，呼应课文 Section A “环保活动” 场景； 中间：分 “活动内容（讲座、比赛、植树）”“个人做法” 两层，对应题目所有提示，逻辑与课文 “活动介绍” 结构一致； 结尾：用 “Actions speak louder than words” 呼应课文 Section B 1a 的功能句，升华主题。 （2）话题词句运用 词汇：renewable energy、solar energy、electric cars、sort、cloth bags； 短语：take part in、reduce plastic waste、start with； 句型：“which I found very interesting”（定语从句）、“As the saying goes...”（引用句式）。 （3）贴合主题 所有内容围绕 “环保周”，且活动（讲座、垃圾分类、植树）均来自课文核心场景； 个人做法 “买布袋送邻居” 符合“reuse cloth bags” 的环保理念，体现 “从课文到写作” 的应用能力。 1. 语法精讲(并列句) 并列连词 核心含义 分句关系 考点提示 and 和；并且 并列（顺承/递进） 考点 1：连接两个肯定分句，表 “同时发生的动作 / 递进的结果”； 考点 2：主语不同时，第二个分句需补全主语（如 “Recycling can protect... and it can save...”，不可漏 “it”） but 但是；然而 转折（前后对比） 考点1：连接语义相反的分句，不可与 “though/although” 连用（如 “Though it’s hard, but I’ll try→错误，去掉 but”）； 考点2：转折关系需明确（如 “想环保但不知怎么做”，用 but 衔接） or 或者；否则 选择/警告（否定结果） 考点 1：表 “选择” 时，用于疑问句 / 肯定句；表 “警告” 时，用于否定结果（如 “不快点就迟到”）；考点 2：连接两个动词时，后接动词原形（如 “walk or ride”，不可用 “ride”） while 然而；当…… 时（对比） 对比（前后分句对比） 考点 1：表 “对比” 时，分句主语通常不同，强调 “两者差异”（如 “点头表同意，摇头表不同意”）；考点 2：不可与 “when” 混淆（when 表 “时间”，while 表 “对比”） 2. 语法综合检测 （1）语法填空（用 and, but, or, while 填空） 1.We should reduce waste ______ reuse things — it’s good for the environment. 2.The expert talked about solar energy ______ I listened carefully. 3.You should shut off the lights when leaving ______ you will waste electricity. 4.I want to join the environmental organization, ______ I don’t have enough time. （2）句型转换 5.We collect waste paper. We send it to the recycling center.（用and连接）→ ________________________________________________ 6.You can walk to school. You can ride a bike to school.（用or连接）→ ________________________________________________ 7.Using plastic bags is convenient. It’s bad for the environment.（用but连接）→ ________________________________________________ （3）单项选择 8.—Should we plant trees in spring ______ autumn? —In spring, because trees grow better then. A. and B. but C. or D. while 9.Solar energy is clean ______ it can save coal, ______ many countries are using it now. A. and; so B. but; or C. or; while D. and; but 【答案】 1.and 2. while 3. or 4. but 5.We collect waste paper and send it to the recycling center. 6.You can walk to school or ride a bike to school. 7.Using plastic bags is convenient but it’s bad for the environment. 8.C 9. A 话题综合训练 一、单项选择 1．Rainforests are the lungs of the earth. They ________ make the air fresher. A．can B．must C．need 【答案】A 【详解】句意：雨林是地球的肺，它们能让空气更清新。 考查情态动词辨析。can 能够；must 必须；need 需要。根据句意“雨林是地球的肺”可知，这是对雨林客观能力和属性的描述，“能够让空气更清新”是其固有的、被公认的功能。情态动词“can”常用于表示能力或可能性，最符合此处的科学事实描述。故选A。 2．—I’m sorry I didn’t do a good job. —Never mind. ________, you have tried your best. A．After all B．In total C．As a result 【答案】A 【详解】句意：——我很抱歉我没有做好。——没关系。毕竟，你已经尽力了。 考查副词短语。after all毕竟；in total总共；as a result因此。根据“I’m sorry I didn’t do a good job.”和“you have tried your best.”可知，尽管没做好，但毕竟尽力了。after all符合语境，安慰对方并强调“尽力”这一事实。故选A。 3．If you have trouble, you ________ ask the police for help. A．ought to B．would C．must 【答案】A 【详解】句意：如果你有麻烦，你应该向警察求助。 考查情态动词辨析。 ought to应该；would会，通常用于假设或意愿；must必须。根据“If you have trouble, you ... ask the police for help.”可知，这是一个条件句，表示在真实可能的情况下给出建议。ought to用于表达建议或轻微的义务，语气较委婉，符合“向警察求助”这种常见建议的语境。故选A。 4．Ms. Li often tells us growing up is a ________ that takes time and learning. A．present B．program C．process 【答案】C 【详解】句意：李老师经常告诉我们成长是一个需要时间和学习的过程。 考查名词辨析。present礼物；program项目；process过程。根据“that takes time and learning”可知，成长是一个需要时间和学习的“过程”。故选C。 5．— I’m not sure if Tony ________ his hobby next term. — If he ________ his time well, his parents will allow him to keep it. A．will give up; manages B．will put up; will manage C．puts on; manages 【答案】A 【详解】句意：——我不确定托尼下学期是否会放弃他的爱好。 ——如果他管理好自己的时间，他的父母会允许他保留它。 考查时态和动词短语辨析。will give up将会放弃，一般将来时；will put up将会建立，一般将来时；puts on穿上，一般现在时；manages安排，一般现在时；will manage一般将来时。根据“I’m not sure if Tony...”可知是宾语从句，从句描述将来的动作，需用一般将来时，表示“放弃”；根据“If he...his time well, his parents will allow him”可知此处是“if”引导的条件状语从句，遵循“主将从现”原则，从句用一般现在时（manages）。故选A。 6．With good ________, high-speed railways of China are famous all over the world. A．technology B．program C．research 【答案】A 【详解】句意：凭借良好的技术，中国的高速铁路闻名世界。 考查名词辨析。technology技术；program项目；research研究。根据“high-speed railways of China are famous all over the world.”可知，是指凭借着良好的技术，中国高铁才能闻名于世。故选A。 7．—Do you think fresh water can ________ on the earth one day? —I’m afraid so, if people don’t save it. A．go out B．run out C．take out 【答案】B 【详解】句意：——你认为地球上的淡水有一天会耗尽吗？——恐怕会的，如果人们不节约它。 考查动词短语。go out出去；run out耗尽，用完；take out取出。根据“Do you think fresh water can... on the earth one day?”可知，此处询问淡水是否会耗尽。故选B。 8．The scientist has failed in the test many times, ________ he never gives up. A．but B．so C．or 【答案】A 【详解】句意：这位科学家在测试中多次失败了，但是他从不放弃。 考查连词。but但是，表转折；so所以，表结果；or或者，表选择。根据“The scientist has failed in the test many times ... he never gives up.”可知，前后句子意思发生了转折。but“但是”，表转折。故选A。 9．In the countryside, people live together in a huge house with gardens and backyards, ________ in cities, houses are usually close together. A．while B．so C．or 【答案】A 【详解】句意：在农村，人们一起住在一个带花园和后院的大房子里，而在城市，房子通常挨得很近。 考查连词辨析。while然而；so因此；or或者。根据分析句子“In the countryside, people live together in a huge house with gardens and backyards,… in cities, houses are usually close together.”可知，此处前后构成转折关系，所以此处填入转折连词while，意为“然而”符合语境。故选A。 10．Chemistry is not so easy, ________ I like it very much. A．but B．or C．and 【答案】A 【详解】句意：化学不容易，但是我非常喜欢它。 考查连词辨析。but但是，表示转折关系；or或者，表示选择关系；and和，表示并列关系；根据“Chemistry is not...very much.”可知，前后两句之间是转折关系。故选A。 11．It’s best to learn tai chi from a teacher, so you can either look for local clubs ________ ask at school about classes. A．and B．or C．but 【答案】B 【详解】句意：最好从老师那里学习太极，所以你可以寻找当地的俱乐部或者在学校询问课程。 考查连词用法。and和；or或者；but但是。根据“so you can either look for local clubs...ask at school about classes.”可知，空处表示选择关系，用“or”连接，either...or...表示“或者……或者……”。故选B。 12．Helen is only 5 years old, ________ she knows a lot about new energy. A．so B．or C．but 【答案】C 【详解】句意：海伦只有5岁，但她知道很多关于新能源的知识。 考查连词。so因此；or否则；but但是。根据“Helen is only 5 years old,...she knows a lot about new energy.”可知，前句说海伦年龄很小，后句说她懂得很多新能源知识，前后句应该表示转折关系，用but。故选C。 13．The T-shirt is really nice, _________ it’s too small for me. A．so B．for C．but D．or 【答案】C 【详解】句意：这件T恤真的很好看，但对我来说太小了。 考查连词辨析。so所以，表示因果关系；for因为，表示理由或原因；but但是，表示转折关系；or或者，否则，表示选择或条件关系。分析“The T-shirt is really nice”和“it’s too small for me”可知，前后句是转折关系，所以应该用but。故选C。 14．My bike was broken yesterday, ________ I had to walk to school. A．or B．when C．so D．but 【答案】C 【详解】句意：昨天我的自行车坏了，所以我不得不走路上学。 考查并列连词辨析。or或者；when当……的时候；so所以；but但是。根据“My bike was broken yesterday”和“I had to walk to school”可知，“走路上学”是“自行车坏了”的结果。故选C。 15．Mike ________ Tim are in the restaurant, ________ Milly is not. A．and; and B．but; but C．and; but D．but; and 【答案】C 【详解】句意：迈克和蒂姆在餐厅，但米莉不在。 考查连词的用法。and和；but但是。根据“Mike...Tim are in the restaurant”可知第一空连接并列名词Mike和Tim，应用and；第二个空，由“Milly is not.”可知，表示转折，用but。故选C。 二、完形填空 People usually check whether their keys, wallets and phones are with them before going out. But many people in China now have one more important thing to take: a face mask. They hope that it can protect them 16 the polluted air. Many cities in China saw a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air 17 looks like a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people’s health, 18 for children and old people. They fell ill easily and the 19 were full of people. They had problems with their noses and lungs. So it’s necessary 20 people from doing so many bad things to the environment. For example, people should use cars less and 21 burn lots of coal and gas. The government needs to take measures to make factories stop pouring 22 waste gas into the sky. Three students from No.4 High School in Beijing 23 a report to advise how to protect the environment. They suggested 24 people should plant more trees and let off fewer fireworks for celebration. We hope more people will join us in 25 a difference. In this way, the sky will certainly return to good. 16．A．in B．from C．for D．to 17．A．that B．/ C．who D．what 18．A．lucky B．especial C．especially D．specially 19．A．schools B．gardens C．hospitals D．museum 20．A．stop B．stopping C．to stop D．stopped 21．A．needn’t B．shouldn’t C．should D．could 22．A．too many B．many too C．too much D．much too 23．A．wrote B．write C．are writing D．written 24．A．which B．where C．that D．whether 25．A．make B．to make C．making D．made 【答案】 16．B 17．A 18．C 19．C 20．C 21．B 22．C 23．A 24．C 25．C 【导语】本文讲述了中国雾霾污染问题及防护措施，呼吁人们保护环境。 16．句意：他们希望口罩能保护他们免受污染空气的伤害。 in在；from从；for为了；to到。根据“it can protect them”可知，此处指口罩可以保护人们免受污染空气的伤害。protect sb from，“保护……免受……”，是固定搭配。故选B。 17．句意：这是看起来像雾和烟混合物的脏空气。 that那个，可引导定语从句，先行词为人或物；/不填；who谁，可引导定语从句，先行词为人；what什么，不能引导定语从句。分析句子结构可知，此句为定语从句，先行词为“air”，且从句中缺少主语，用that引导定语从句。故选A。 18．句意：糟糕的空气对人们的健康有害，尤其是儿童和老人。 lucky幸运的，形容词；especial特殊的，形容词；especially尤其，副词；specially专门地，副词。空处修饰介词短语“for children and old people”，用副词。且根据“Poor air is bad for people’s health”可知，此处指糟糕的空气尤其对老人和小孩有害，表示强调，用especially。故选C。 19．句意：他们很容易生病，然后医院里挤满了人。 schools学校；gardens花园；hospitals医院；museum博物馆。根据“They fell ill easily”可知，生病要去医院，所以医院挤满人。故选C。 20．句意：因此有必要阻止人们做这么多破坏环境的事。 stop阻止，动词原形；stopping阻止，动名词；to stop阻止，动词不定式；stopped阻止，动词过去式。此句为“It’s+形容词+to do sth”“做某事是……的”结构，空处填动词不定式。故选C。 21．句意：例如，人们应该少用车，不应该大量燃烧煤炭和燃气。 needn’t不必；shouldn’t不应该；should应该；could可以。根据“people should use cars”和“burn lots of coal and gas”可知，此处建议人们不应该烧煤和燃气。表示否定的建议，用shouldn’t。故选B。 22．句意：政府需采取措施阻止工厂排放过多废气到空气中。 too many太多，修饰可数名词复数；many too错误搭配；too much太多，修饰不可数名词；much too太，修饰形容词。“waste gas”为不可数名词短语，用too much修饰。故选C。 23．句意：北京第四中学的三名学生写了一份报告，就如何保护环境提出了建议。 wrote写了，动词过去式；write写，动词原形；are writing正在写，现在进行时结构；written写，动词过去分词。根据“They suggested”可知，此句时态为一般过去时，表示过去发生的事情，空处填动词过去式作谓语。故选A。 24．句意：他们建议人们应该种更多的树，放更少的烟花来庆祝。 which哪个，可引导宾语从句；where哪里，可引导宾语从句；that无实义，可引导宾语从句；whether是否，可引导宾语从句。分析句子结构可知，此句为宾语从句，且从句中不缺任何成分。根据“They suggested”和“people should plant”可知，此句为“suggest that sb should do”的虚拟语气结构，用that引导宾语从句。故选C。 25．句意：我们希望更多人将加入我们，引起变化。 make制作，动词原形；to make制作，动词不定式；making制作，动名词；made制作，动词过去式。空处位于介词“in”后，填动名词作宾语。故选C。 三、阅读理解 The world uses about one billion tons (吨) of water a day. Water is a human right and everyone should have their share. Yet more than 700 million people around the world have trouble getting clean, safe water. Treating wastewater is a good way to provide fresh water for us. And it also helps the environment by keeping waste out of rivers and oceans. 80% of wastewater around the world is not treated at all, and it is running into oceans. But now we have got the technology to treat and reuse the wastewater. While 75% of our planet is covered with water, only about 2% is fresh water—that comes from rivers, lakes, ice and snow. The rest, 98% of the water, is in seas and oceans. It is too salty to drink. Then desalination businesses come in. More than 19,000 factories have been built around the world, mostly in coastal (沿海的) countries. They process more than 92 million tons of water every day. But the technology they use requires a lot of energy. Scientists are working to create a less costly technology. They want to produce 20 times more clean water and make sure everyone has enough. But for now, the world still faces each day with not having enough water for everyone. 26．How many people have trouble in getting clean water around the world? A．About 1 billion. B．Over 700 million. C．About 98 million. D．Only 19 million. 27．How does treating waste water help the environment? A．By keeping waste out of rivers and oceans. B．By letting waste run into oceans. C．By storing waste in ice and snow. D．By sending waste to coastal countries. 28．What does the underlined word “desalination” in Paragraph 4 mean? A．远洋运输 B．潮汐发电 C．食盐销售 D．海水淡化 29．At present, the technology to process water ________. A．saves much money B．satisfies everyone C．needs much energy D．causes pollution 30．What can we infer from the last paragraph? A．Water should be a human right. B．The water problem is still serious. C．Our planet is covered with water. D．Everyone has enough clean water. 【答案】26．B 27．A 28．D 29．C 30．B 【导语】本文是一篇说明文，主要讲述了世界上水资源紧缺的问题，并介绍了废水处理和海水淡化技术，但目前仍面临能源消耗大和成本高的问题，全球水资源短缺问题依然严峻。 26．细节理解题。根据第一段“Yet more than 700 million people around the world have trouble getting clean, safe water.”可知，全球有超过7亿人难以获得清洁、安全的水。故选B。 27．细节理解题。根据第二段“And it also helps the environment by keeping waste out of rivers and oceans.”可知，废水处理通过防止废物进入河流和海洋来保护环境。故选A。 28．词句猜测题。根据第四段“The rest, 98% of the water, is in seas and oceans. It is too salty to drink. Then desalination businesses come in.”可知，98%的水在海洋中，太咸了不能饮用，因此需要“desalination”来处理。结合选项，可推知“desalination”意为“海水淡化”。故选D。 29．细节理解题。根据第四段“But the technology they use requires a lot of energy.”可知，目前处理水的技术需要大量能源。故选C。 30．推理判断题。根据最后一段“But for now, the world still faces each day with not having enough water for everyone.”可推知，目前世界仍然面临水资源不足的问题，水资源短缺问题依然严峻。故选B。 四、短文填空 阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。 The world has experienced a lot of extreme (极端的)weather this year because of environmental 31.______________[tʃeɪndʒ]. Scientists think Carbon emissions are the main reason after 32.______________(study) the subject for many years. To solve the problem, CO2 is turning into a hopeful choice.  “The beauty of carbon is that you can make so many different things,” Volker Sick, 33.______________ researcher at the University of Michigan, told the reporter. Making meat from CO2 is a way 34.______________ (reuse) it. It is hard to imagine that the food could be 35.______________ (produce) from CO2, but that is exactly one of the astronauts’ foods. As we all know, the process is rather difficult. 36.______________ the cost is very high. However, it makes the food nearly100 37. t______________ more environment- friendly than others. Scientists are trying their 38.______________ (good) to improve the process. And scientists want to make the public have the ability to afford it. Then, making 39.______________ (shoe) from CO2 is also a new technology. A sports shoe company is trying to make parts of shoes with carbon. Besides, Air Company is selling a kind of perfume (香水) made 40.______________ CO2. The perfume helps the new company get popular with the young. 【答案】 31．change 32．studying 33．a 34．to reuse 35．produced 36．And 37．times 38．best 39．shoes 40．from 【导语】本文讲述了通过创新技术将二氧化碳转化为产品以应对环境变化和减少碳排放的故事。 31．句意：由于环境变化，今年世界经历了许多极端天气。观察句子结构可知，空格所填词位于形容词“environmental”之后，所以空格处填名词。所给音标[tʃeɪndʒ]所对应的英文为change“改变”，名词，故填change。 32．句意：经过多年的研究，科学家们认为碳排放是主要原因。所给词study“学习”，动词，位于介词“after”之后，应该用其动名词形式studying。故填studying。 33．句意：密歇根大学的研究人员Volker Sick告诉记者。空格后的“researcher”是一个读音以辅音音素开头的单数可数名词，空格处应该填不定冠词a。故填a。 34．句意：利用二氧化碳制造肉类是一种再利用它的方法。观察句子结构可知，这里考查动词不定式作定语修饰空格前的名词“way”，故填to reuse。 35．句意：很难想象食物可以用二氧化碳来生产。空格所在句中的主语“the food”与谓语动词“produce”之间是动宾关系，所以用被动语态，所给词produced“生产”，动词，其过去分词为produced。故填produced。 36．句意：而且成本非常高。空格前句子“the process is rather difficult.”和空格后的句子“the cost is very high.”属于并列关系，用并列连词and，所填词位于句首，首字母需大写。故填And。 37．句意：然而，它使食物比其他食物环保近100倍。根据首字母提示以及“more environment-friendly than others.”可知，说的是“比其他食物环保近100倍”。这里要用time的复数形式times，表示倍数。故填times。 38．句意：科学家们正在尽最大努力改进这一过程。观察空格所在句可知，本题考查短语try one’s best to do sth“尽某人最大努力做某事”，故填good的最高级best。故填best。 39．句意：用二氧化碳制造鞋子也是一项新技术。这里是鞋类的泛指，应填shoe的复数形式，故填shoes。 40．句意：此外，Air公司正在销售一种由二氧化碳制成的香水。make from“由……制成的”，看不出原材料，故填from。 五、补全对话 A: Andy, I sent you a WeChat message half an hour ago, but you didn’t reply. B: I’m sorry. I didn’t see it. A: Never mind. 41._________________________________? B: I was watching a short video on my phone. A: 42._________________________________? B: It’s about environmental protection. It tells some good ways to save paper. A: Wow, it’s educational. 43._________________________________? B: Sure. For example, we should use both sides of paper. And we should send old books and magazines to the recycling center. A: Sounds great. 44._________________________________? B: We can also send e-cards instead of paper cards on New Year’s Day. By the way, I’m going to give away my old books to the recycling center. Would you like to go with me? A: 45._________________________________. Let’s go together. 【答案】41．What were you doing (then/at that time) 42．What is it/the video about 43．Can/Could you tell me some ways to save paper/Have you learned some good ways to save paper 44．What else/What else can we do (to save paper) 45．Yes, I’d love to/Sure 【导语】本文两人在讨论如何做些事情来节约用纸 41．根据下文“I was watching a short video on my phone.”可知，询问对方那时候正在做什么。故填What were you doing (then/at that time)。 42．根据下文“It’s about environmental protection.”可知，询问短视频是关于什么的。故填What is it/the video about。 43．根据下文“Sure. For example, we should use both sides of paper. And we should send old books and magazines to the recycling center.”可知，询问对方能否介绍一些方法来节约用纸。故填Can/Could you tell me some ways to save paper/Have you learned some good ways to save paper。 44．根据下文“We can also send e-cards instead of paper cards on New Year’s Day. ”可知，询问其他节约用纸的方法。故填What else/What else can we do ( to save paper)。 45．根据上文“Would you like to go with me?”以及“Let’s go together.”可知，此处同意对方的邀请。故填Yes, I’d love to/Sure。 第 1 页 第 2 页 学科网（北京）股份有限公司 $Unit 2 Saving the Earth Unit 2 Topic 3 话题复习 1. 情境语篇过单词 中文翻译 校园环保周的难忘经历 上周，我们学校举办了“环保周”活动，还邀请了当地一家环保组织的工作人员来指导。活动第一天，他们给我们讲解了环境保护的重要性，还教我们如何回收利用垃圾 —— 比如将塑料袋、罐头盒和旧报纸分类，送到专门的回收点。 活动中，大家就“如何减少浪费”展开讨论：有人建议购物时用布袋代替塑料袋，有人提出离开教室要关掉电源。讨论后，我们达成一致，但也有小分歧—— 比如是否该禁止使用一次性电池。这时老师提醒：“毕竟环保需要循序渐进，不要急于求成，更不能放弃。” 第二天，环保专家来做讲座，他高度地评价了中国的环保技术，比如利用太阳能的龙羊峡水坝，以及不需要汽油的电动汽车。他还说，高速列车不仅噪音小（车厢内部几乎听不到车轮声），还能减少碳排放，是很好的环保出行方式。 最后一天，我们分组行动：有的去清理校园角落的垃圾，去除地面的油污；有的种植小树苗，取代枯死的灌木，还要小心防止昆虫叮咬。专家说，太阳能、风能等可再生能源是未来的重要来源，它们不会耗尽，能保护地球免受污染。 这次活动让我明白：环保不是口号，而是需要每个人用行动去践行。即使是短距离出行选择步行，也是对地球的一份贡献。 英语短文 An Unforgettable Experience of School Environmental Protection Week Last week, our school held an “Environmental Protection Week” and invited staff from a local environmental ____________ (1) to guide us. On the first day of the activity, they explained the importance of environmental ____________ (2) to us and taught us how to ____________ (3) waste — such as sorting ____________ (4) bags, ____________ (5) and old newspapers, and sending them to special recycling points. During the discussion about “how to reduce waste”, someone suggested using ____________ (6) bags instead of plastic bags when shopping, and someone proposed to ____________ (7) the ____________ (8) when leaving the classroom. After the discussion, we reached an ____________ (9), but there was also a small ____________ (10) — such as whether to ban disposable ____________ (11). At this time, the teacher reminded us: “____________ (12), environmental protection needs to be gradual. Don’t finish it in a ____________ (13), and never ____________ (14) up.” On the second day, an environmental ____________ (15) gave a lecture. He thought ____________ (16) of China’s environmental protection technologies, such as the Longyangxia _________ (17) which uses __________ (18) energy, and ____________ (19) cars that don’t need ____________(20). He also said that ____________ (21) trains not only have low noise (you can hardly hear the ____________ (22) sound ____________ (23) the carriage) but also reduce carbon emissions, making them a good eco-friendly travel method. On the last day, we took ____________ (24) in groups: some cleaned the garbage in the corners of the campus and ____________ (25) oil stains on the ground; some planted small saplings to ____________ (26) dead shrubs, and had to be careful to prevent ____________ (27) from ____________ (28). The expert said that ____________ (29) energy, wind energy and other ____________ (30) energy sources are important ____________ (31) for the future. They will never ______ (32) out and can ____________ (33) the earth from pollution. This activity made me understand that environmental protection is not a slogan but requires everyone to practice it with ____________ (34). Even choosing to walk for a short ____________ (35) is a contribution to the earth. 2. 易考词汇变形归纳梳理 原形 变形 protect (v. 保护) protection (n. 保护) organize (v. 组织) organization (n. 组织) agree (v. 同意) agreement (n. 同意) agree (v. 同意) disagreement (n. 分歧) electric (adj. 电动的) electricity (n. 电) high (adj. 高的) highly (adv. 高度地) renew (v. 更新) renewable (adj. 可再生的) act (v. 行动) action (n. 行动) use (v. 使用) reusable (adj. 可重复使用的) remove (v. 去除) removal (n. 去除) 2. 词汇变形综合检测 1.The government has set up a new ____________ (organize) to deal with plastic pollution. 2.We should take part in ____________ (protect) activities to save endangered animals. 3.After a long discussion, they finally reached an ____________ (agree) on reducing car use. 4.There was a small ____________ (disagree) among students about whether to use disposable chopsticks. 5.Saving ____________ (electric) by shutting off lights is a simple way to protect the environment. 6.Experts think ____________ (high) of China’s solar energy technology because it’s green and cheap. 7.We should use more ____________ (renew) energy like wind and sunlight to replace coal. 8.It’s important to take ____________ (act) instead of just talking about environmental protection. 9.This shop sells ____________ (reuse) bags to encourage customers to reduce plastic waste. 10.The ____________ (remove) of oil stains from the river will take about three months. 1. 短语梳理 核心短语 中文含义 hurry up 赶快，快点 give up 放弃 shut off 停止，关掉 run out (of) 用完，耗尽 after all 毕竟；归根结底 instead of 代替；而不是 take action 采取行动 think highly of 高度评价 reduce, reuse and recycle 减少、重复使用和回收利用 sort out 分类；整理 短语综合检测 （1）单项选择 1.We must ______ the electricity when we leave the classroom. It’s a simple way to save energy. A. shut off B. run out C. give up D. think highly of 2.Experts ______ the solar energy project in Qinghai because it helps reduce pollution a lot. A. hurry up B. think highly of C. take action D. instead of （2）用方框中短语的适当形式填空，每词限用一次。 （hurry up, give up, shut off, run out, after all, instead of, take action） 3. ____________! The environmental lecture will start in five minutes. Don’t be late. 4. We should walk or ride bikes ____________ taking cars for short trips to reduce air pollution. 5. If we don’t ____________ to protect the river, its water will ____________ soon and fish will die. （3）句子翻译 6.回收利用废纸和罐头盒不仅能保护环境，还能节约资源。（reduce, reuse and recycle） _________________________________________________________________________________ 7.毕竟我们只有一个地球，所以不要放弃任何环保的机会。（after all, give up） _________________________________________________________________________________ 话题概述 本话题写作围绕“环保行动（个人 / 学校 / 社会）与可再生能源”展开： 1.介绍个人环保做法（如节约用电、用布袋购物、短距离步行）； 2.描述学校 / 社区环保活动（如环保周、垃圾分类、植树）； 3.说明可再生能源的优势（如太阳能、风能、电动汽车）； 4.呼吁他人参与环保（强调 “行动比语言重要”）。 【高分写作句型】角度1：描述 “环保行动及好处” 1. 课文例句 Recycling can protect the environment, and it can save money, too. Solar energy requires less coal and oil. It is a good way to protect our earth from pollution. 2. 仿写练习 行动：参与垃圾分类能减少垃圾量，还能让可回收物变废为宝。 ____________________________________________________________________________________ ____________________________________________________________________________________ 好处：步行或骑行代替开车能减少碳排放，是改善空气质量的有效方式。 ____________________________________________________________________________________ ____________________________________________________________________________________ 2. 【高分写作句型】表达 “环保呼吁” 1. 课文例句 Actions speak louder than words. After all, we have only one earth. We should do everything to protect it. 2. 仿写练习 呼吁1：不要等环境恶化了才行动——毕竟我们只有一个家园。 ____________________________________________________________________________________ ____________________________________________________________________________________ 呼吁2：每个人都该为环保出一份力，否则我们的后代将无处栖身。 ____________________________________________________________________________________ ____________________________________________________________________________________ 3. 【高分写作句型】提出 “个人环保建议” 1. 课文例句 irst, you ought to shut off the electricity when you leave a room. Second, you’d better walk or ride a bike instead of taking a bus if you travel a short distance. 2. 仿写练习 建议1：离开家时，我们应该检查水龙头是否关紧以节约用水。 ____________________________________________________________________________________ ____________________________________________________________________________________ 建议2：购物时，最好自带保温杯而不是买一次性纸杯。 ____________________________________________________________________________________ ____________________________________________________________________________________ 话题写作剖析 书面表达 假设你校上周举办了 “环保周” 活动，请根据以下提示，写一篇 80-100 词的短文，介绍活动内容及你的收获。提示： 活动内容：环保讲座（专家讲可再生能源）、垃圾分类比赛、植树； 你的做法：参与垃圾分类，用零花钱买布袋送给邻居； 你的收获：环保要从小事做起，行动比语言重要。 要求： 1.条理清晰，语句通顺； 2.包含所有提示要点，可适当发挥； 3.文中不得出现真实人名、校名。 ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 1. 语法精讲(并列句) 并列连词 核心含义 分句关系 考点提示 and 和；并且 并列（顺承/递进） 考点 1：连接两个肯定分句，表 “同时发生的动作 / 递进的结果”； 考点 2：主语不同时，第二个分句需补全主语（如 “Recycling can protect... and it can save...”，不可漏 “it”） but 但是；然而 转折（前后对比） 考点1：连接语义相反的分句，不可与 “though/although” 连用（如 “Though it’s hard, but I’ll try→错误，去掉 but”）； 考点2：转折关系需明确（如 “想环保但不知怎么做”，用 but 衔接） or 或者；否则 选择/警告（否定结果） 考点 1：表 “选择” 时，用于疑问句 / 肯定句；表 “警告” 时，用于否定结果（如 “不快点就迟到”）；考点 2：连接两个动词时，后接动词原形（如 “walk or ride”，不可用 “ride”） while 然而；当…… 时（对比） 对比（前后分句对比） 考点 1：表 “对比” 时，分句主语通常不同，强调 “两者差异”（如 “点头表同意，摇头表不同意”）；考点 2：不可与 “when” 混淆（when 表 “时间”，while 表 “对比”） 2. 语法综合检测 （1）语法填空（用 and, but, or, while 填空） 1.We should reduce waste ______ reuse things — it’s good for the environment. 2.The expert talked about solar energy ______ I listened carefully. 3.You should shut off the lights when leaving ______ you will waste electricity. 4.I want to join the environmental organization, ______ I don’t have enough time. （2）句型转换 5.We collect waste paper. We send it to the recycling center.（用and连接）→ ________________________________________________ 6.You can walk to school. You can ride a bike to school.（用or连接）→ ________________________________________________ 7.Using plastic bags is convenient. It’s bad for the environment.（用but连接）→ ________________________________________________ （3）单项选择 8.—Should we plant trees in spring ______ autumn? —In spring, because trees grow better then. A. and B. but C. or D. while 9.Solar energy is clean ______ it can save coal, ______ many countries are using it now. A. and; so B. but; or C. or; while D. and; but 话题综合训练 一、单项选择 1．Rainforests are the lungs of the earth. They ________ make the air fresher. A．can B．must C．need 2．—I’m sorry I didn’t do a good job. —Never mind. ________, you have tried your best. A．After all B．In total C．As a result 3．If you have trouble, you ________ ask the police for help. A．ought to B．would C．must 4．Ms. Li often tells us growing up is a ________ that takes time and learning. A．present B．program C．process 5．— I’m not sure if Tony ________ his hobby next term. — If he ________ his time well, his parents will allow him to keep it. A．will give up; manages B．will put up; will manage C．puts on; manages 6．With good ________, high-speed railways of China are famous all over the world. A．technology B．program C．research 7．—Do you think fresh water can ________ on the earth one day? —I’m afraid so, if people don’t save it. A．go out B．run out C．take out 8．The scientist has failed in the test many times, ________ he never gives up. A．but B．so C．or 9．In the countryside, people live together in a huge house with gardens and backyards, ________ in cities, houses are usually close together. A．while B．so C．or 10．Chemistry is not so easy, ________ I like it very much. A．but B．or C．and 11．It’s best to learn tai chi from a teacher, so you can either look for local clubs ________ ask at school about classes. A．and B．or C．but 12．Helen is only 5 years old, ________ she knows a lot about new energy. A．so B．or C．but 13．The T-shirt is really nice, _________ it’s too small for me. A．so B．for C．but D．or 14．My bike was broken yesterday, ________ I had to walk to school. A．or B．when C．so D．but 15．Mike ________ Tim are in the restaurant, ________ Milly is not. A．and; and B．but; but C．and; but D．but; and 二、完形填空 People usually check whether their keys, wallets and phones are with them before going out. But many people in China now have one more important thing to take: a face mask. They hope that it can protect them 16 the polluted air. Many cities in China saw a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air 17 looks like a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people’s health, 18 for children and old people. They fell ill easily and the 19 were full of people. They had problems with their noses and lungs. So it’s necessary 20 people from doing so many bad things to the environment. For example, people should use cars less and 21 burn lots of coal and gas. The government needs to take measures to make factories stop pouring 22 waste gas into the sky. Three students from No.4 High School in Beijing 23 a report to advise how to protect the environment. They suggested 24 people should plant more trees and let off fewer fireworks for celebration. We hope more people will join us in 25 a difference. In this way, the sky will certainly return to good. 16．A．in B．from C．for D．to 17．A．that B．/ C．who D．what 18．A．lucky B．especial C．especially D．specially 19．A．schools B．gardens C．hospitals D．museum 20．A．stop B．stopping C．to stop D．stopped 21．A．needn’t B．shouldn’t C．should D．could 22．A．too many B．many too C．too much D．much too 23．A．wrote B．write C．are writing D．written 24．A．which B．where C．that D．whether 25．A．make B．to make C．making D．made 三、阅读理解 The world uses about one billion tons (吨) of water a day. Water is a human right and everyone should have their share. Yet more than 700 million people around the world have trouble getting clean, safe water. Treating wastewater is a good way to provide fresh water for us. And it also helps the environment by keeping waste out of rivers and oceans. 80% of wastewater around the world is not treated at all, and it is running into oceans. But now we have got the technology to treat and reuse the wastewater. While 75% of our planet is covered with water, only about 2% is fresh water—that comes from rivers, lakes, ice and snow. The rest, 98% of the water, is in seas and oceans. It is too salty to drink. Then desalination businesses come in. More than 19,000 factories have been built around the world, mostly in coastal (沿海的) countries. They process more than 92 million tons of water every day. But the technology they use requires a lot of energy. Scientists are working to create a less costly technology. They want to produce 20 times more clean water and make sure everyone has enough. But for now, the world still faces each day with not having enough water for everyone. 26．How many people have trouble in getting clean water around the world? A．About 1 billion. B．Over 700 million. C．About 98 million. D．Only 19 million. 27．How does treating waste water help the environment? A．By keeping waste out of rivers and oceans. B．By letting waste run into oceans. C．By storing waste in ice and snow. D．By sending waste to coastal countries. 28．What does the underlined word “desalination” in Paragraph 4 mean? A．远洋运输 B．潮汐发电 C．食盐销售 D．海水淡化 29．At present, the technology to process water ________. A．saves much money B．satisfies everyone C．needs much energy D．causes pollution 30．What can we infer from the last paragraph? A．Water should be a human right. B．The water problem is still serious. C．Our planet is covered with water. D．Everyone has enough clean water. 四、短文填空 阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。 The world has experienced a lot of extreme (极端的)weather this year because of environmental 31.______________[tʃeɪndʒ]. Scientists think Carbon emissions are the main reason after 32.______________(study) the subject for many years. To solve the problem, CO2 is turning into a hopeful choice.  “The beauty of carbon is that you can make so many different things,” Volker Sick, 33.______________ researcher at the University of Michigan, told the reporter. Making meat from CO2 is a way 34.______________ (reuse) it. It is hard to imagine that the food could be 35.______________ (produce) from CO2, but that is exactly one of the astronauts’ foods. As we all know, the process is rather difficult. 36.______________ the cost is very high. However, it makes the food nearly100 37. t______________ more environment- friendly than others. Scientists are trying their 38.______________ (good) to improve the process. And scientists want to make the public have the ability to afford it. Then, making 39.______________ (shoe) from CO2 is also a new technology. A sports shoe company is trying to make parts of shoes with carbon. Besides, Air Company is selling a kind of perfume (香水) made 40.______________ CO2. The perfume helps the new company get popular with the young. 五、补全对话 A: Andy, I sent you a WeChat message half an hour ago, but you didn’t reply. B: I’m sorry. I didn’t see it. A: Never mind. 41._________________________________? B: I was watching a short video on my phone. A: 42._________________________________? B: It’s about environmental protection. It tells some good ways to save paper. A: Wow, it’s educational. 43._________________________________? B: Sure. For example, we should use both sides of paper. And we should send old books and magazines to the recycling center. A: Sounds great. 44._________________________________? B: We can also send e-cards instead of paper cards on New Year’s Day. By the way, I’m going to give away my old books to the recycling center. Would you like to go with me? A: 45._________________________________. Let’s go together. 第 1 页 第 2 页 学科网（北京）股份有限公司 $