2.4 We Are Friends（Grammar in Use）-《英语 基础模块1》（外研版第二版）《一课一练》（原卷版+解析版）

**基本信息** 中职英语《基础模块1》Unit 2语法同步练，以“课前预习-课堂检测”分层设计，通过概念自测、专项选择及语篇填空，构建从语法概念到综合应用的巩固路径，适配中职学情提升语言能力与学习能力。 **分层设计** |层次|知识覆盖|设计特色| |----|----------|----------| |课前预习|一般过去时与主谓一致的概念、构成规则及高频错误|10道选择自测题强化基础认知，搭配规则解析与错误示例，助力课前自主预习| |课堂检测|单一语法应用（20题选择）到综合语篇实践（10题填空）|从专项选择到语篇填空，实现从语法规则到语境应用的递进，贴合课堂巩固需求|

编写说明：基于中职学生英语基础薄弱、学习内驱力不足的学情特点，为提升学习效率，落实课前、课中、课后教学闭环，本专辑依据最新《中等职业学校英语课程标准》，打造《英语 基础模块1》（外研版第二版）《一课一练》，专辑共40练。 本卷为《英语 基础模块1》（外研版第二版）Unit 2 We Are Friends（Grammar in Use）的课前预习与课堂检测。 《英语 基础模块1》（外研版第二版） Unit 2 We Are Friends 一课一练（4） Grammar in Use 【课前预习】 一、语法概念自测——一般过去时 1. 一般过去时表示的动作或状态发生在什么时间？ A. 现在 B. 过去 C. 将来 D. 任何时间 【答案】B 【解析】考点：时态概念。一般过去时表示发生在过去的动作或存在的状态。A选项"现在"属于一般现在时；C选项"将来"属于一般将来时；D选项范围过大。 2. 下列哪个时间状语常与一般过去时连用？ A. every day B. next week C. yesterday D. often 【答案】C 【解析】考点：时间状语辨析。yesterday（昨天）常与一般过去时连用。every day和often用于一般现在时；next week用于一般将来时。易错点：学生常混淆时间状语与时态的对应关系。 3. 一般过去时的谓语动词应使用哪种形式？ A. 动词原形 B. 动词过去式 C. 动词现在分词 D. 动词不定式 【答案】B 【解析】考点：动词形式。一般过去时的谓语动词应用动词的过去式。A为动词原形（一般现在时）；C为现在分词（进行时）；D为不定式（非谓语形式）。 4. 一般过去时的否定形式是如何构成的？ A. 在动词后加not B. 在动词前加do not C. 用did not + 动词原形 D. 用was/were not + 动词-ing 【答案】C 【解析】考点：否定形式构成。一般过去时的否定形式用"did not (didn't) + 动词原形"。A和D形式错误；B为一般现在时否定形式。易错点：学生易在did not后仍使用过去式。 5. "I was at home yesterday." 的否定句是？ A. I was not at home yesterday. B. I did not at home yesterday. C. I don't at home yesterday. D. I am not at home yesterday. 【答案】A 【解析】考点：be动词过去式的否定。含be动词（was/were）的句子，否定形式在be动词后加not。B缺少动词；C时态错误（一般现在时）；D.be动词形式错误。 二、语法精讲——一般过去时 【定义】 一般过去时（Past Simple）用来描述在过去某个时间点发生的动作、行为或存在的状态。讲述过去的故事通常也用一般过去时。 【构成规则】 1. 谓语动词用过去式形式： - 规则变化：动词原形 + -ed（如：play→played, talk→talked） - 以e结尾的动词直接加-d（如：live→lived） - 以"辅音字母+y"结尾的动词，变y为i再加-ed（如：study→studied） - 重读闭音节结尾的动词，双写尾字母再加-ed（如：stop→stopped） - 不规则变化需单独记忆（如：go→went, see→saw, have→had） 2. 否定形式：did not (didn't) + 动词原形 例：I didn't go to the park yesterday. 3. 一般疑问句：Did + 主语 + 动词原形？ 例：Did you watch the film last night? 4. be动词的过去式：was/were - was用于第一/三人称单数（I/he/she/it） - were用于第二人称单数和所有人称复数 - 否定形式：was not (wasn't)/were not (weren't) - 疑问句：将was/were提到句首 【常见时间状语】 yesterday（昨天），last week/month/year（上周/上月/去年）， a week ago（一周前），in 2023（在2023年）， just now（刚才），once upon a time（从前），in the past（在过去） 【高频错误】 1. did后仍用过去式：❌ I didn't went → ✅ I didn't go 2. 不规则动词过去式记混：❌ goed → ✅ went 3. 忘记把be动词改为过去式：❌ I am happy yesterday → ✅ I was happy yesterday 三、语法概念自测——主谓一致 6. 由"and"连接的两个名词作主语时，谓语动词通常用什么形式？ A. 单数形式 B. 复数形式 C. 取决于第一个名词 D. 取决于最后一个名词 【答案】B 【解析】考点：主谓一致规则。由and连接的两个或多个并列成分作主语时，谓语动词通常用复数形式。例：Li Wei and Lisa study at the same school. 7. 由"either...or..."连接两个主语时，谓语动词的人称和数与谁保持一致？ A. 与第一个主语一致 B. 与最近的主语一致 C. 总是用复数 D. 总是用单数 【答案】B 【解析】考点：就近一致原则。由either...or..., neither...nor..., not only...but also...连接的主语，谓语动词的人称和数与最近的一个主语保持一致。例：Either you or he is wrong. 8. "Both Lisa and Jack like reading."这句话的谓语为什么用like？ A. 因为Lisa是单数 B. 因为Jack是单数 C. 因为both...and...表示两者，主语是复数 D. 因为reading是现在分词 【答案】C 【解析】考点：both...and...的主谓一致。both...and...连接的两个名词表示复数概念，谓语动词用复数形式。 9. "Neither he nor they _____ right." 横线处应填什么？ A. is B. am C. are D. be 【答案】C 【解析】考点：就近一致原则。neither...nor...连接的主语，谓语与最近的主语they保持一致，they对应are。易错点：学生可能根据he使用is，但就近原则要看离谓语最近的主语。 10. "Not only his friends but also Paul _____ going to do volunteer work." 横线处应填什么？ A. is B. are C. am D. be 【答案】A 【解析】考点：就近一致原则。not only...but also...连接的主语，谓语与最近的主语Paul（第三人称单数）保持一致，用is。易错点：学生可能根据his friends用are，但就近原则看的是Paul。 四、语法精讲——主谓一致 【定义】 主谓一致（Subject-Verb Agreement）指句子的谓语动词在人称和数上必须与主语保持一致。换言之，主语是单数，谓语动词用单数形式；主语是复数，谓语动词用复数形式。 【核心规则】 1. and / both...and... 连接并列主语 → 谓语用复数 例：Tom and Jerry are good friends. 例：Both my parents and my teacher support my decision. 2. or / either...or... / neither...nor... / not only...but also... 连接并列主语 → 遵循"就近一致"原则：谓语与最近的主语保持一致 例：Either the twins or their elder brother is right.（最近主语是brother） 例：Not only Tim but also his friends are going to see a film.（最近主语是friends） 3. 注意事项 - 由and连接的两个名词若表示同一概念（如bread and butter黄油面包），谓语用单数 - 动词的第三人称单数形式：一般动词加-s/-es，以s/x/ch/sh/o结尾加-es，辅音+y变y为i加-es 【高频错误】 1. 就近原则忘记：❌ Either you or he are right → ✅ Either you or he is right 2. both...and...后误用单数：❌ Both Tom and Jerry is here → ✅ Both Tom and Jerry are here 3. not only...but also...只看前半部分：❌ Not only the students but also the teacher are coming → ✅ Not only the students but also the teacher is coming 【课堂检测】 一、单元语法选择——一般过去时（5题） 1. My friend and I ______ to the cinema yesterday evening. A. go B. went C. goes D. going 【答案】B 【解析】考点：一般过去时。句意：我和朋友昨晚去了电影院。时间状语"yesterday evening"提示用一般过去时，go的过去式是went。易错点：学生可能忘记不规则动词go的过去式，误选go或goes。 2. She ______ very happy when she received the gift from her friend. A. was B. were C. is D. are 【答案】A 【解析】考点：be动词过去式。句意：当她收到朋友送的礼物时，她非常开心。主语是She，用was。易错点：学生可能受"received"干扰，但此处需要be动词的过去式，she对应was。 3. They ______ not ______ each other for a long time after the quarrel. A. do...talk B. did...talked C. did...talk D. does...talk 【答案】C 【解析】考点：一般过去时否定形式。句意：争吵之后，他们很久没有和对方说话。否定形式用"did not + 动词原形"，talk用原形。易错点：学生在did后仍用talked（过去式）。 4. ______ you ______ camping with your friends last weekend? A. Do...go B. Are...going C. Did...went D. Did...go 【答案】D 【解析】考点：一般过去时疑问句。句意：上周末你和朋友去野营了吗？一般疑问句用"Did + 主语 + 动词原形"。易错点：学生可能在Did后仍用过去式went。 5. He ______ an interesting story about his childhood in class yesterday. A. told B. tells C. tell D. telling 【答案】A 【解析】考点：不规则动词过去式。句意：他昨天在课堂上讲了一个关于他童年的有趣故事。时间状语yesterday用一般过去时，tell的过去式是told。易错点：学生可能误用telled（不存在）。 二、单元语法选择——主谓一致（5题） 6. Both my brother and I ______ playing basketball after school. A. likes B. like C. like D. is liking 【答案】C 【解析】考点：主谓一致。句意：我哥哥和我都喜欢放学后打篮球。both...and...连接并列主语，谓语动词用复数形式like。易错点：学生可能只看到"my brother"而用likes。 7. Either the students or the teacher ______ going to attend the meeting. A. are B. is C. were D. am 【答案】B 【解析】考点：就近一致原则。句意：要么学生们要么老师要参加会议。either...or...连接并列主语，谓语与最近的主语the teacher（第三人称单数）保持一致，用is。易错点：学生可能根据students用are。 8. Neither he nor his friends ______ wrong this time. A. are B. is C. was D. am 【答案】A 【解析】考点：就近一致原则。句意：这次他和他的朋友们都没有错。neither...nor...连接的主语，谓语与最近的主语friends一致，用复数are。 9. Not only Li Ming but also his parents ______ very kind to me. A. is B. was C. has been D. are 【答案】D 【解析】考点：就近一致原则。句意：不仅李明而且他的父母对我都很友善。not only...but also...连接的主语，谓语与最近的主语his parents一致，用复数are。 10. Tom and Jerry ______ best friends since they were young. A. is B. have been C. has been D. are 【答案】B 【解析】考点：主谓一致和时态。句意：汤姆和杰瑞从小就是最好的朋友。and连接并列主语用复数，且"since they were young"提示用现在完成时，have been。易错点：学生可能忘记and连接复数主语而用has been。 三、综合语法选择（10题） 11. I ______ a very interesting book about friendship yesterday. A. reads B. reading C. is reading D. read (过去式) 【答案】D 【解析】考点：不规则动词过去式。句意：我昨天读了一本关于友谊的很有趣的书。时间状语yesterday用一般过去时，read的过去式与原形同形但读音不同。易错点：学生可能误选reads或is reading，因忽略时间状语yesterday。 12. A good friend always ______ you when you are in trouble. A. helps B. helped C. helping D. to help 【答案】A 【解析】考点：一般现在时和主谓一致。句意：好朋友总在你遇到困难时帮助你。主语为第三人称单数a good friend，谓语用helps。always提示一般现在时。 13. Neither my brother ______ I like playing computer games too much. A. or B. and C. nor D. but 【答案】C 【解析】考点：固定搭配。句意：我哥哥和我都不太喜欢玩电脑游戏。neither...nor...是固定搭配，表示"既不……也不……"。易错点：学生可能混淆neither...nor和either...or的搭配。 14. Neither my sister nor I ______ interested in playing computer games. A. is B. was C. am D. are 【答案】C 【解析】考点：就近一致原则。句意：我妹妹和我都对玩电脑游戏不感兴趣。neither...nor...连接的主语，谓语与最近的主语I一致，be动词用am。易错点：学生可能误根据sister用is，或认为两者并列用are。 15. My mother ______ me a gift on my birthday last month. A. bought B. buys C. will buy D. is buying 【答案】A 【解析】考点：一般过去时。句意：上个月我生日时妈妈给我买了礼物。last month提示用一般过去时，buy的过去式是bought。 16. Not only the teacher but also the students ______ the film very much. A. likes B. like C. liked D. liking 【答案】B 【解析】考点：就近一致原则。句意：不仅老师，学生们也非常喜欢这部电影。not only...but also...连接的主语，谓语与students一致，用复数like。且根据句意用一般现在时。 17. Last night, I ______ a nice message from my old friend Tom. A. receive B. receives C. receiving D. received 【答案】D 【解析】考点：一般过去时。句意：昨晚我收到了我的老朋友汤姆的一条温馨短信。Last night提示用一般过去时，receive的过去式是received。易错点：学生可能忘记加-ed或混淆不规则变化。 18. Both the parents and the child ______ going on a trip next week. A. is B. was C. has been D. are 【答案】D 【解析】考点：主谓一致。句意：父母和孩子下周都要去旅行。both...and...连接并列主语，谓语用复数are。next week提示时态可用现在进行时表将来。 19. — What ______ you ______ last night? — I watched a film with my friends. A. did...do B. do...do C. are...doing D. were...doing 【答案】A 【解析】考点：一般过去时疑问句。句意：——你昨晚做了什么？——我和朋友看了一部电影。last night提示用过去时，"What did you do"是标准问句。 20. Either you or he ______ to clean the classroom today. A. are B. is C. have D. were 【答案】B 【解析】考点：就近一致原则。句意：要么你要么他今天打扫教室。either...or...连接的主语，谓语与最近的主语he（第三人称单数）一致，用is。 四、语法填空（10题） 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 Last Sunday, my class (21) ______ (have) a very special activity — we visited an old people's home in our city. It was my first time (22) ______ (do) volunteer work, and I felt a little nervous at first. However, my best friend Li Wei encouraged me and said we could do something meaningful together. When we arrived at the home, the old people (23) ______ (be) very happy to see us. Some of them were sitting in the garden and smiling warmly. My friend Li Wei and I (24) ______ (sing) some beautiful songs for them. They clapped their hands and sang along with us. Not only my classmate (25) ______ also the teachers joined us in the activities. Everyone was having a wonderful time together. During the visit, I talked (26) ______ an old woman named Granny Wang. She was 78 years old and had a kind face. She told me that she (27) ______ (feel) lonely sometimes because her children lived far away in another city. I felt sad when I heard this. I promised to visit her again next month and bring some books for her. One of my classmates (28) ______ (take) many beautiful photos to remember this special day. (29) ______ the end of the day, we said goodbye and they waved to us at the gate. Many of them had tears in their eyes. This experience taught me (30) ______ a small act of kindness can bring great joy to others. I learned that true friendship is not only between people of the same age. We should care for the elderly and show them love and respect. This was truly a day I will never forget. 21. ______ 【答案】had 【解析】考点：动词时态。句意：上周日，我们班开展了一次特别的活动。Last Sunday提示用一般过去时，have的过去式为had。 22. ______ 【答案】to do 【解析】考点：非谓语动词。句意：这是我第一次做志愿者工作。It was my first time to do sth.是固定句型，用不定式to do。易错点：学生可能误用doing。 23. ______ 【答案】were 【解析】考点：be动词过去式。句意：当我们到达时，老人们见到我们很高兴。主语the old people是复数，用were。 24. ______ 【答案】sang 【解析】考点：不规则动词过去式。句意：我的朋友李伟和我为他们唱了几首歌。唱歌是过去发生的事情，sing的过去式是sang。 25. ______ 【答案】but 【解析】考点：固定搭配。句意：不仅我的同学，老师们也加入了我们的活动。not only...but also...是固定搭配。 26. ______ 【答案】to/with 【解析】考点：介词。句意：在参观过程中，我和一位叫王奶奶的老人交谈。talk to/with sb.和某人交谈。 27. ______ 【答案】felt 【解析】考点：动词时态。句意：她告诉我她有时感到孤独。叙述过去的事情，用一般过去时felt。 28. ______ 【答案】took 【解析】考点：不规则动词过去式。句意：我的一个同学拍了很多照片来纪念这一天。take的过去式是took。 29. ______ 【答案】At 【解析】考点：介词短语。句意：在一天结束的时候，我们告别了。At the end of是固定短语。 30. ______ 【答案】that 【解析】考点：宾语从句引导词。句意：这次经历教会我一个小的善举能给他人带来巨大的快乐。teach sb. that...，that引导宾语从句。 原创精品资源学科网独家享有版权，侵权必究！ 学科网（北京）股份有限公司 $ 编写说明：基于中职学生英语基础薄弱、学习内驱力不足的学情特点，为提升学习效率，落实课前、课中、课后教学闭环，本专辑依据最新《中等职业学校英语课程标准》，打造《英语 基础模块1》（外研版第二版）《一课一练》，专辑共40练。 本卷为《英语 基础模块1》（外研版第二版）Unit 2 We Are Friends（Grammar in Use）的课前预习与课堂检测。 《英语 基础模块1》（外研版第二版） Unit 2 We Are Friends 一课一练（4） Grammar in Use 【课前预习】 一、语法概念自测——一般过去时 1. 一般过去时表示的动作或状态发生在什么时间？ A. 现在 B. 过去 C. 将来 D. 任何时间 2. 下列哪个时间状语常与一般过去时连用？ A. every day B. next week C. yesterday D. often 3. 一般过去时的谓语动词应使用哪种形式？ A. 动词原形 B. 动词过去式 C. 动词现在分词 D. 动词不定式 4. 一般过去时的否定形式是如何构成的？ A. 在动词后加not B. 在动词前加do not C. 用did not + 动词原形 D. 用was/were not + 动词-ing 5. "I was at home yesterday." 的否定句是？ A. I was not at home yesterday. B. I did not at home yesterday. C. I don't at home yesterday. D. I am not at home yesterday. 二、语法精讲——一般过去时 【定义】 一般过去时（Past Simple）用来描述在过去某个时间点发生的动作、行为或存在的状态。讲述过去的故事通常也用一般过去时。 【构成规则】 1. 谓语动词用过去式形式： - 规则变化：动词原形 + -ed（如：play→played, talk→talked） - 以e结尾的动词直接加-d（如：live→lived） - 以"辅音字母+y"结尾的动词，变y为i再加-ed（如：study→studied） - 重读闭音节结尾的动词，双写尾字母再加-ed（如：stop→stopped） - 不规则变化需单独记忆（如：go→went, see→saw, have→had） 2. 否定形式：did not (didn't) + 动词原形 例：I didn't go to the park yesterday. 3. 一般疑问句：Did + 主语 + 动词原形？ 例：Did you watch the film last night? 4. be动词的过去式：was/were - was用于第一/三人称单数（I/he/she/it） - were用于第二人称单数和所有人称复数 - 否定形式：was not (wasn't)/were not (weren't) - 疑问句：将was/were提到句首 【常见时间状语】 yesterday（昨天），last week/month/year（上周/上月/去年）， a week ago（一周前），in 2023（在2023年）， just now（刚才），once upon a time（从前），in the past（在过去） 【高频错误】 1. did后仍用过去式：❌ I didn't went → ✅ I didn't go 2. 不规则动词过去式记混：❌ goed → ✅ went 3. 忘记把be动词改为过去式：❌ I am happy yesterday → ✅ I was happy yesterday 三、语法概念自测——主谓一致 6. 由"and"连接的两个名词作主语时，谓语动词通常用什么形式？ A. 单数形式 B. 复数形式 C. 取决于第一个名词 D. 取决于最后一个名词 7. 由"either...or..."连接两个主语时，谓语动词的人称和数与谁保持一致？ A. 与第一个主语一致 B. 与最近的主语一致 C. 总是用复数 D. 总是用单数 8. "Both Lisa and Jack like reading."这句话的谓语为什么用like？ A. 因为Lisa是单数 B. 因为Jack是单数 C. 因为both...and...表示两者，主语是复数 D. 因为reading是现在分词 9. "Neither he nor they _____ right." 横线处应填什么？ A. is B. am C. are D. be 10. "Not only his friends but also Paul _____ going to do volunteer work." 横线处应填什么？ A. is B. are C. am D. be 四、语法精讲——主谓一致 【定义】 主谓一致（Subject-Verb Agreement）指句子的谓语动词在人称和数上必须与主语保持一致。换言之，主语是单数，谓语动词用单数形式；主语是复数，谓语动词用复数形式。 【核心规则】 1. and / both...and... 连接并列主语 → 谓语用复数 例：Tom and Jerry are good friends. 例：Both my parents and my teacher support my decision. 2. or / either...or... / neither...nor... / not only...but also... 连接并列主语 → 遵循"就近一致"原则：谓语与最近的主语保持一致 例：Either the twins or their elder brother is right.（最近主语是brother） 例：Not only Tim but also his friends are going to see a film.（最近主语是friends） 3. 注意事项 - 由and连接的两个名词若表示同一概念（如bread and butter黄油面包），谓语用单数 - 动词的第三人称单数形式：一般动词加-s/-es，以s/x/ch/sh/o结尾加-es，辅音+y变y为i加-es 【高频错误】 1. 就近原则忘记：❌ Either you or he are right → ✅ Either you or he is right 2. both...and...后误用单数：❌ Both Tom and Jerry is here → ✅ Both Tom and Jerry are here 3. not only...but also...只看前半部分：❌ Not only the students but also the teacher are coming → ✅ Not only the students but also the teacher is coming 【课堂检测】 一、单元语法选择——一般过去时（5题） 1. My friend and I ______ to the cinema yesterday evening. A. go B. went C. goes D. going 2. She ______ very happy when she received the gift from her friend. A. was B. were C. is D. are 3. They ______ not ______ each other for a long time after the quarrel. A. do...talk B. did...talked C. did...talk D. does...talk 4. ______ you ______ camping with your friends last weekend? A. Do...go B. Are...going C. Did...went D. Did...go 5. He ______ an interesting story about his childhood in class yesterday. A. told B. tells C. tell D. telling 二、单元语法选择——主谓一致（5题） 6. Both my brother and I ______ playing basketball after school. A. likes B. like C. like D. is liking 7. Either the students or the teacher ______ going to attend the meeting. A. are B. is C. were D. am 8. Neither he nor his friends ______ wrong this time. A. are B. is C. was D. am 9. Not only Li Ming but also his parents ______ very kind to me. A. is B. was C. has been D. are 10. Tom and Jerry ______ best friends since they were young. A. is B. have been C. has been D. are 三、综合语法选择（10题） 11. I ______ a very interesting book about friendship yesterday. A. reads B. reading C. is reading D. read (过去式) 12. A good friend always ______ you when you are in trouble. A. helps B. helped C. helping D. to help 13. Neither my brother ______ I like playing computer games too much. A. or B. and C. nor D. but 14. Neither my sister nor I ______ interested in playing computer games. A. is B. was C. am D. are 15. My mother ______ me a gift on my birthday last month. A. bought B. buys C. will buy D. is buying 16. Not only the teacher but also the students ______ the film very much. A. likes B. like C. liked D. liking 17. Last night, I ______ a nice message from my old friend Tom. A. receive B. receives C. receiving D. received 18. Both the parents and the child ______ going on a trip next week. A. is B. was C. has been D. are 19. — What ______ you ______ last night? — I watched a film with my friends. A. did...do B. do...do C. are...doing D. were...doing 20. Either you or he ______ to clean the classroom today. A. are B. is C. have D. were 四、语法填空（10题） 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 Last Sunday, my class (21) ______ (have) a very special activity — we visited an old people's home in our city. It was my first time (22) ______ (do) volunteer work, and I felt a little nervous at first. However, my best friend Li Wei encouraged me and said we could do something meaningful together. When we arrived at the home, the old people (23) ______ (be) very happy to see us. Some of them were sitting in the garden and smiling warmly. My friend Li Wei and I (24) ______ (sing) some beautiful songs for them. They clapped their hands and sang along with us. Not only my classmate (25) ______ also the teachers joined us in the activities. Everyone was having a wonderful time together. During the visit, I talked (26) ______ an old woman named Granny Wang. She was 78 years old and had a kind face. She told me that she (27) ______ (feel) lonely sometimes because her children lived far away in another city. I felt sad when I heard this. I promised to visit her again next month and bring some books for her. One of my classmates (28) ______ (take) many beautiful photos to remember this special day. (29) ______ the end of the day, we said goodbye and they waved to us at the gate. Many of them had tears in their eyes. This experience taught me (30) ______ a small act of kindness can bring great joy to others. I learned that true friendship is not only between people of the same age. We should care for the elderly and show them love and respect. This was truly a day I will never forget. 21. ______ 22. ______ 23. ______ 24. ______ 25. ______ 26. ______ 27. ______ 28. ______ 29. ______ 30. ______ 原创精品资源学科网独家享有版权，侵权必究！ 学科网（北京）股份有限公司 $