Unit 5 Section Ⅰ Starting out & Understanding ideas（课件PPT）-【精讲精练】2025-2026学年高中英语必修第一册（外研版）

该高中英语课件围绕“人与动物关系”主题，以黑脉金斑蝶迁徙语篇为载体，涵盖定语从句、核心词汇短语等知识点。通过“读文清障·篇章助读”和“文化采风”导入，连接学生已有动物知识，构建从语料积累、基础梳理到核心知识练透的学习支架。 其亮点在于融合思维品质（语篇理解中细节探究与难句分析）、文化意识（黑脉金斑蝶迁徙文化介绍）和语言能力（词汇句型结合高考真题练习）。采用“练透-练通”模式，学生能系统掌握知识提升综合能力，教师可借助清晰结构高效实施教学。

Section Ⅰ　Starting out & Understanding ideas UNIT 5　Into the wild 栏目导航 UNIT 5　Into the wild 1 栏目导航 读文清障•篇章助读 01 基础梳理•新知落实 02 语篇理解•要点领悟 03 核心知识•关键能力 04 随堂演练•巩固提升 05 课时作业•知能达标 07 进阶提升•写作微练 06 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 读文清障•篇章助读 栏目导航 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 基础梳理•新知落实 栏目导航 栏目导航 UNIT 5　Into the wild 1 charity annual seek professor measure 栏目导航 UNIT 5　Into the wild 1 position crash percent destroy creature 栏目导航 UNIT 5　Into the wild 1 migrate determine eventually solution 栏目导航 UNIT 5　Into the wild 1 amazing survive effect 栏目导航 UNIT 5　Into the wild 1 to do to down on 栏目导航 UNIT 5　Into the wild 1 that of the North American monarch butterfly The more the greater 栏目导航 UNIT 5　Into the wild 1 语篇理解•要点领悟 栏目导航 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 food partner warmer weather time position destroying more survive 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 这两条信息——一天中的时刻和太阳在天空中的方位——让黑脉金斑蝶决定它的飞行路线。 栏目导航 UNIT 5　Into the wild 1 如果这种做法起作用，那么可能到某个时候黑脉金斑蝶的数量会再次增加。 栏目导航 UNIT 5　Into the wild 1 核心知识•关键能力 栏目导航 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 to seek for have no choice but to seek your help 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 to reach management couldn't manage it for lack of money 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 measures measuring we took measures to protect the oceans 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 to try determination 栏目导航 UNIT 5　Into the wild 1 determined Determined to complete the job on time 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 amazing amazed to see 栏目导航 UNIT 5　Into the wild 1 To my amazement What amazes me is It amazes me that 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 off on in 栏目导航 UNIT 5　Into the wild 1 With more and more trees cut down 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 surviving on survivor survival 栏目导航 UNIT 5　Into the wild 1 how to survive the storm 栏目导航 UNIT 5　Into the wild 1     栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 greater colder and colder The more the more 栏目导航 UNIT 5　Into the wild 1 随堂演练•巩固提升 栏目导航 栏目导航 UNIT 5　Into the wild 1 solve the mystery at certain times in search of in nature millions of tell the time measure the position 栏目导航 UNIT 5　Into the wild 1 a piece of information spend the winter in trouble human activity destroy the natural environment a great awareness of a scientific research 栏目导航 UNIT 5　Into the wild 1 amazing determine measures 栏目导航 UNIT 5　Into the wild 1 higher than that of 100 years ago more and more the harder the better 栏目导航 UNIT 5　Into the wild 1 进阶提升•写作微练 栏目导航 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 栏目导航 UNIT 5　Into the wild 1 The number of employees in the company was reduced from 40 to 25 because of poor management. With the development of China, the number of students learning Chinese is increasing rapidly. 栏目导航 UNIT 5　Into the wild 1 课时作业•知能达标 栏目导航 课时作业•知能达标 栏目导航 UNIT 5　Into the wild 1 谢谢观看 栏目导航 UNIT 5　Into the wild 1 The Monarch's Journey Many animals move from one place to another① at certain times of the year.This annual② movement is called migration.They migrate to find food, seek③ a partner, or in search of④ warmer weather.One of the most wonderful⑤ migrations in nature is [1]that of the North American monarch butterfly． [1]此处是简单句，句中的that作主语，指代的是migration。 Every autumn, millions of these beautiful insects⑥ with fine black and orange wings begin a long and difficult journey.Somehow⑦ they manage to⑧ travel around 4，000 kilometres south and find their way to California or Mexico.However, until recently no one knew [2]how they did this． [2]此处是how引导的宾语从句，作knew的宾语。 A team of scientists [3]led⑨ by Professor⑩ Eli Shlizerman at the University of Washington has now found the answer.They have found out that the monarch is able to tell the time of day.It uses its eyes to measure⑪ the position⑫ of the sun.These two pieces of information—the time of day and the point where the sun is in the sky—allow⑬the butterfly to determine⑭ the way to go.Eventually⑮， it manages to reach the places[4]where it will spend the winter． [3]此处是过去分词短语作后置定语，修饰A team of scientists。因为A team of scientists和lead是逻辑上的动宾关系，故这里用过去分词。 [4]此处是where引导的定语从句，修饰先行词places, where在从句中作地点状语。 The solution⑯ to the mystery of the monarch's amazing⑰ ability comes at a time [5]when it is in serious trouble．Its population⑱ has crashed⑲ by as much as 90 per cent⑳ in the last few years.Sadly, human activity is the main reason [6]why the number of monarch butterflies is falling．In many of the places where the butterfly can be found, people are destroying㉑ the natural environment.They cut down㉒ trees and use chemicals㉓ [7] that kill the plants that monarch caterpillars eat． [5]此处是when引导的定语从句，修饰先行词a time, when在从句中作时间状语。 [6]此处是why引导的定语从句，修饰先行词reason，why在从句中作原因状语。 [7]此处是that引导的定语从句，修饰先行词chemicals，that在该从句中作主语；其中“that monarch caterpillars eat”也是that引导的定语从句，修饰先行词plants, that在该从句中作宾语，可省略。 The research on the monarch's behaviour㉔ has however led to a greater awareness㉕of this creature㉖.[8]People have been working together to record its migration and make sure that there are enough plants for it to feed on. If this works, there may come a time when the number of monarch butterflies increases once again.[9]The more we know about this lovely creature, the greater the chance it will survive㉗ and keep its place in the natural world for a long time to come. [8]本句中have been working是现在完成进行时，表示动作从过去某个时刻开始，一直延续到现在，还可能延续下去。 [9]本句中“The more...，the greater...”是“the＋比较级...，the＋比较级...”结构，表示后者随着前者的变化而变化。 ①from one place to another从一个地方到另一个地方 ②annual adj.一年一度的，每年的 annual meeting年会 annual report年度报告 ③seek v.寻找，寻求 ④in search of寻找 ⑤wonderful adj.令人惊奇的；令人赞叹的 ⑥insect n.昆虫 ⑦somehow adv.用某种方法；不知怎么地 anyhow adv.无论如何 ⑧manage to do sth 设法做成某事 manage v.完成(困难的事)；勉力完成 ⑨lead v.掌管；领导；率领；过(某种生活) vi.导致；造成 lead to...导致…… ⑩professor n.教授 ⑪measure v.量，测量 n.措施；尺寸 ⑫position n.位置 ⑬allow vt.允许；使……成为可能 allow sb to do sth 允许某人做某事 allow doing sth 允许做某事 be allowed to do sth 被允许做某事 allow for考虑到 ⑭determine v. 测定，确定 ⑮eventually adv.终于，最终 ⑯solution n.解决，解决方法 a solution to...……的解决方法 ⑰amazing adj.惊人的，了不起的 ⑱population n.数量；人口 ⑲crash v.暴跌 ⑳percent n.百分比(＝percent) fifty per cent百分之五十 ㉑destroy v.破坏，毁掉 ㉒cut down 砍倒；削减 ㉓chemical n.化学品 adj.化学的 ㉔behaviour n. 行为；举止 behave v.表现；表现得体 behave oneself表现良好；行为良好 ㉕awareness n.认识，意识 ㉖creature n.生物，动物 ㉗survive v.活下来，幸存 [文化采风] 黑脉金斑蝶(monarch butterfly)呈世界性分布，但主要分布于北美至南美地区。成年蝶颜色鲜艳，翅膀上有显眼的橙色及黑色斑纹，边缘为黑色，布有许多白色斑点。每年秋季，成千上万的黑脉金斑蝶向南迁移越冬。 黑脉金斑蝶的迁徙之旅 许多动物会在一年中的某些时候从一个地方迁移到另一个地方，这种一年一度的运动叫作迁徙。它们迁徙是为了寻找食物、寻找伴侣，或为了寻找更温暖的天气。北美黑脉金斑蝶的迁徙是大自然中最为美妙的迁徙之一。 每年秋天，数百万只长着好看的黑色和橙色斑纹翅膀的黑脉金斑蝶会开始一段漫长而艰难的旅程。不知它们怎么设法向南飞行了大约4000公里，找到了去往加利福尼亚或墨西哥的路。但一直到最近，也没有人知道它们是如何做到的。 华盛顿大学伊莱·席里哲曼教授领导的科学家(研究)小组现在已经找到了答案。他们发现黑脉金斑蝶可以分辨出一天的时刻。它用眼睛来测量太阳的方位。这两条信息——一天中的时刻和太阳在空中的方位——让黑脉金斑蝶决定它的路线。最终它成功到达它过冬的地方。 黑脉金斑蝶在遭遇严重困境时，它惊人的能力的奥秘才得以解开。过去的几年里，黑脉金斑蝶的数量骤减了百分之九十。不幸的是，人类活动是黑脉金斑蝶数量下降的主要原因。在黑脉金斑蝶生存的许多地方， 人们正在破坏自然环境。他们砍伐树木，使用能杀死黑脉金斑蝶幼虫食用的植物的化学药剂。 不管怎样，对黑脉金斑蝶(迁徙)行为的研究让人们对这种生物有了更多的认识。人们一直齐心协力记录它的迁徙，并确保它有足够的植物可食用。如果这起作用，那么可能某个时候黑脉金斑蝶的数量会再次增加。我们对这种可爱的生物了解得越多，它生存的机会以及在未来很长一段时间内保持它在自然界中的地位的机会就越大。 Ⅰ.重点词汇 核心单词 1．_______ n.慈善机构，慈善团体 2．______ adj.一年一度的，每年的 3．____ v.寻找，寻求 4．_________ n.教授 5．_______ v.量，测量　n.措施；尺寸 6．________ n.位置 7．_____ v.暴跌 8．_______ n.百分比 9．_______ v.毁坏，毁掉 10．________ n.生物，动物 拓展词汇 1．_______ v.移居，迁徙→migration n.迁徙 2．_________ v.测定；确定→determined adj.坚决的；有决心的→determination n.决心，决定 3．__________ adv.终于；最终→eventual adj.最后的；最终的 4．________ n.解决；解决方法→solve vt.解决；解答 5．_______ adj.惊人的；了不起的→amaze vt.使吃惊；使惊讶→amazed adj.感到惊奇的；吃惊的；惊讶的→amazement n.吃惊；惊讶 6．_______ v.活下来；幸存→survival n.幸存→survivor n.幸存者 7．______ n.影响；结果→effective adj.有效的 Ⅱ.重点短语 1．manage _____设法做成某事 2．the solution ___解决……的方法；……的解答 3．cut _____砍倒；削减 4．feed __ 以……为食 Ⅲ.重点句型 1．that指代前面的可数名词 One of the most wonderful migrations in nature is ________________ ____________________________(北美洲黑脉金斑蝶的迁徙). 2．the＋比较级，the＋比较级 ________(越多) we know about this lovely creature, ___________(越大) the chance it will survive and keep its place in the natural world for a long time to come. Ⅰ.What's the main idea of the text? A．The routes of the Monarch's migration. B．The reasons of the Monarch's migration. C．The significance of the Monarch's migration. D．The study of the Monarch's migration. 答案　D Ⅱ.Read the passage and fill in the blanks Read the text carefully and then choose the best answer. 1．What is the main purpose of the first paragraph? A．To tell us what migration is exactly. B．To tell us the reasons for migration. C．To introduce the topic of the text. D．To tell us how many animals migrate. 2．What will probably happen to the North American monarch butterflies if it is cloudy? A．They may lose their way. B．They can't see anything. C．They can't find any food. D．They will feel very cold. 3．What's the writer's attitude to people's efforts? A．Negative. B．Neutral. C．Indifferent. D．Positive. 4．What is the main reason for the North American monarch butterflies' population crash? A．Being caught by humans. B．The destroyed natural environment. C．The bad weather condition. D．Being eaten by birds. 答案　1—4 CADB 1．These two pieces of information—the time of day and the point where the sun is in the sky—allow the butterfly to determine the way to go. [句式分析] 本句为主从复合句。句中的“the time of day and the point where the sun is in the sky”是information的同位语；“where the sun is in the sky”是where引导的定语从句；to go是动词不定式作定语。 [翻译]　___________________________________________________ _________________________________ 2．If this works, there may come a time when the number of monarch butterflies increases once again. [句式分析] 本句为主从复合句。“If this works”为if引导的条件状语从句；“when the number of monarch...again”为定语从句。 [翻译]　___________________________________________________ __________________ [核心词汇·练透] seek v.寻找；寻求；请求 (1)seek to do sth 　设法做某事 seek (for) sth　 寻找/谋求某物 seek out　找出，找到 seek sth from sb　向某人寻求某物 (2)seek one's advice/help/assistance 征求某人的建议/帮助/协助 (教材原句)They migrate to find food, seek a partner, or in search of warmer weather. 它们迁徙或为了寻找食物，或为了寻找伴侣，或为了寻找更温暖的天气。 [练通]——单句语法填空/补全句子 (1)I often leave early _______(seek) the right destinations so I can set up early to avoid missing the moment I am attempting to photograph.(2024·全国乙卷) (2)Don't just wait to be informed.You should try to seek ___ the information you need. (3)我的英语遇到了一些困难，因此我只得寻求你的帮助。 I meet with some difficulties with my English，so I _______________ _____________________．(应用文佳句之求助信) manage v.设法做到；管理；负责(公司、组织等)；合理地利用(金钱、时间等)(→manager n.经理→management n.管理) manage to do　设法做成某事 manage it　完成某事 (教材原句)Somehow they manage to travel around 4，000 kilometres south and find their way to California or Mexico. 不知它们怎么设法向南飞行了大约4000公里，找到了去往加利福尼亚或墨西哥的路。 [练通]——单句语法填空/完成句子 (1)Though worn out and sweaty，David managed ________ (reach) the finish line at last.(2022·全国Ⅰ卷，读后续写) (2)Henry hopes to find a job where his ___________(manage) skills can be put to good use. (3)杰克本想送彼得一件礼物庆贺他的生日，但由于缺钱他没能做到。 Jack had hoped to send Peter a gift to congratulate him on his birthday, but he ____________________________________．(续写佳句之细节描写) measure v.量；测量；评估 n.尺寸；(pl.)措施 (1)measure...by... 用……来衡量…… (2)take measures (to do sth) 采取措施(做某事) (教材原句)It uses its eyes to measure the position of the sun. 它用眼睛来测量太阳的方位。 [练通]——单句语法填空/完成句子 (1)The river ________(measure) at least 50 metres in width, but the ten-year-old boy can swim across it within two minutes. (2)The new bridge under construction, _________ (measure) twice as long as the old one, will be completed in 2026. (3)因此，是我们采取措施保护海洋的时候了。(2022·全国甲卷，书面表达) Therefore，it is high time that __________________________________． (应用文佳句之倡议书) [温馨提示]　(1)measure意为“措施”时，常用其复数形式measures。 (2)measure意为“量，有……长(宽、高等)”时，是不及物动词，后跟量的结果，不用被动语态及进行时态；如果此意义的短语作后置定语，要用现在分词形式。 determine v.测定；确定；查明(→determined adj.坚决的；有决心的→determination n.决心，决定) (1)determine to do sth 决定做某事 determine sb to do sth 下决心让某人做某事 determine that... 决定…… (2)be determined to do sth 决心做某事(表示状态) (教材原句)These two pieces of information—the time of day and the point where the sun is in the sky—allow the butterfly to determine the way to go. 这两条信息——一天中的时刻和太阳在天空中的方位——让黑脉金斑蝶能够判定前进的方向。 [练通]——单句语法填空/句式升级 (1)Johnson had made up his mind to give it up, but on second thoughts he determined ______(try) a third time. (2)At my words，with tears rolling down his cheeks，David turned to me and firmly expressed his _____________ (determine) to finish the cross-country run.(2022·全国Ⅰ卷，读后续写) (3)Professor Johnson is such a __________(determine) person that he has managed to finish the research, no matter how hard it is. (4)As they are determined to complete the job on time，they concentrate on their work immediately. →______________________________________，they concentrate on their work immediately.(形容词短语作状语) amazing adj.惊人的；了不起的(→amaze vt.使吃惊，使惊讶→amazed adj.感到惊奇的；吃惊的，惊讶的→amazement n.惊讶) (1)be amazed at/by... 对……很惊奇 be amazed to do sth 对做某事感到惊奇 (2)(much) to one's amazement 令某人(非常)惊讶的是 (教材原句)The solution to the mystery of the monarch's amazing ability comes at a time when it is in serious trouble. 黑脉金斑蝶在遭遇严重困境时它惊人的能力的奥秘才得以解开。 [练通]——单句语法填空/一句多译 (1)Cats are special creatures who possess _______(amaze) vocalization skills.(2024·全国甲卷) (2)The ______(amaze) look on her face showed that she was amazed ______(see) we were helping those homeless children with great enthusiasm. (3)他在短时间内取得了这么大的进步，令我感到惊讶。 ①_______________，he has made such great progress.(amazement) ②_________________ that he has made such great progress.(what 引导的主语从句) ③_________________ he has made such great progress.(it作形式主语) [温馨提示]　amazing指“令人吃惊的”， 强调某人/某事物给他人的感受；而amazed表示本身的感觉，并不强调对他人的影响，多指“(人)感到吃惊的”， 也可修饰与人有关的look，expression，smile，tears，voice等词。 cut down 砍倒；减小；缩减；降价 cut down on　减少/缩减…… cut out　裁减，删去 cut in (on)　插嘴；打断 cut off　切断；阻断；隔绝 cut up　切碎 (教材原句)They cut down trees and use chemicals that kill the plants that monarch caterpillars eat. 他们砍伐树木，使用能杀死黑脉金斑蝶幼虫食用的植物的化学药剂。 [练通]——单句语法填空/句式升级 (1)The water supply has been cut ___ temporarily(暂时地)because the workers are repairing one of the main pipes. (2)The doctor told Bob his heart was in poor condition and that he must cut down __ alcohol(酒) and cigarettes. (3)I am sorry to cut __ on you, but there are one or two things that I don't understand. (4)Because more and more trees are cut down, some animals are facing the danger of dying out. →________________________________,some animals are facing the danger of dying out.(with复合结构) survive v.活下来；幸存(→survivor n.幸存者→survival n.幸存) survive on... 靠……继续维持生活 survive＋n.(the fire/earthquake...) 从(火灾、地震……)中生还 (教材原句)The more we know about this lovely creature, the greater the chance it will survive and keep its place in the natural world for a long time to come. 我们对这种可爱的生物了解得越多，它生存的机会以及在未来很长一段时间内保持它在自然界中的地位的机会就越大。 [练通]——单句语法填空/完成句子 (1)The little boy was the only one _________(survive) the earthquake in his village. (2)The traveller trapped in the lonely island survived __ the fish caught in the sea. (3)He was the only ________ in that bad accident, and after the _________,he has been living a happy and healthy life.(survive) (4)生活不在于如何从暴风雨中幸存，而在于学会在雨中起舞。 Life isn't about ________________________;it's about learning to dance in the rain.(续写佳句之主旨升华) [温馨提示]　survive表示“从地震、火灾、事故等中幸存下来”时，为及物动词，其后不可接介词from或in。 [重点句型·通关] the＋比较级，the＋比较级，意为“越……就越……” (1)句中“The more..., the greater...”为“the＋比较级，the＋比较级”句式，意为“越……就越……”。通常情况下，前一个“the＋比较级”相当于条件状语从句，后一个“the＋比较级”相当于主句。在表示将来意义的情况下，前者常用一般现在时，后者用一般将来时。如果句意明确，该结构常以省略形式出现。 (2)“比较级＋and＋比较级/more and more＋多音节形容词或副词”结构，意为“越来越……”。 (教材原句)The more we know about this lovely creature, the greater the chance it will survive and keep its place in the natural world for a long time to come. 我们对这种可爱的生物了解得越多，它生存的机会以及在未来很长一段时间内保持它在自然界中的地位的机会就越大。 [练通]——单句语法填空/完成句子 (1)The more fat you take in before bedtime, the _______(great) burden (负担) you will put on your body at night. (2)随着冬天的到来，天气变得越来越冷。 With winter coming, the weather is getting _________________． (3)你对我们的传统文化了解越多，你就对它越感兴趣。 ________ you know about our traditional culture，________ you are interested in it.(应用文佳句之告知信) Ⅰ.教材语块必备 1．_________________解开谜团 2．________________在特定的时间 3．____________ 寻找 4．_________ 在自然界 5．___________ 数百万；大量 6．_____________ 判断/分辨时间 7．____________________测量位置 8．______________________一条信息 9．________________过冬 10．__________ 处于困境中 11．______________人类活动 12．_______________________________破坏自然环境 13．____________________对……深刻的认识/了解 14．_____________________科学研究 Ⅱ.单词拼写/完成句子 1．It's _______(惊人的) that the small village has changed into a famous tourist city in only ten years. 2．All the people in the country have a right to _________(确定) their own future. 3．The government has taken a series of ________(措施) to improve the air quality. 4．由于温室气体越来越多，如今的气温比100年前高。 The temperature now is ________________________________ because of more and more greenhouse gases. 5．他对考试越来越有信心了，当然，她学习越努力，考试成绩就越好。 She is getting _____________ confident about the exam and of course, __________ she studies, __________ results she will get. 动态描写——下降/上升 Ⅰ.常用词汇 课文词汇 1．crash by as much as 90 percent 减少了百分之九十之多 2．be falling正在下降 3．the number of...increases ……的数量上升 补充词汇 4．decline slightly轻微下降 5．decrease by/to (＝reduce/decline by/to) 减少了/到 6．increase by/to增加了/到 7．drop sharply急剧下降 8．go up gradually逐渐增长 9．go down slowly缓慢下降 10．soar to猛升到…… 11．shoot up to猛增至…… 12．raise...to...将……增加/提高到…… Ⅱ.常用句型 课本原句 1．Its population has crashed by as much as 90 percent in the last few years. 其数量在近年内减少了百分之九十之多。 2．Sadly, human activity is the main reason why the number of monarch butterflies is falling. 不幸的是，人类活动是造成黑脉金斑蝶数量下降的主要原因。 3．If this works，there may come a time when the number of monarch butterflies increases once again. 如果这些努力产生效果，黑脉金斑蝶的数量在未来有可能再次回升。 其他表达 4．The pound has sunk to its lowest recorded level against the dollar. 英镑对美元的比价跌至有记录以来的最低水平。 5．Unemployment has soared to 18%.失业率猛升到了 18%。 6．During the high school years, annual tutoring costs shoot up to 30，000 yuan and the cost of weekend activities doubles to 19，200 yuan. 在中学期间，每年家庭教师的费用飙升到30 000元，周末活动费用则翻了一番，达到19 200元。 7．They raised their offer to $500.他们将出价抬高到500 美元。 Ⅲ.写作微练 1．由于经营不善，这家公司雇员人数从40人减少到了 25 人。 _____________________________________________________________________________________ 2．随着中国的发展，学习汉语的学生人数在迅速增加。 ____________________________________________________________________________________ $$