Unit 4 Our animal friends 反身代词和方位介词（单元核心语法精练）-2025-2026学年七年级英语下册单元重难点易错题精练（沪教版）

Unit 4 Our animal friends 核心语法精练（反身代词和方位介词） （时间：40分钟，满分：100分） 一、单项选择(本大题共40小题，每小题2分，共80分) 1．Don’t push ________ too hard. If you’re tired, stop to have a rest. A．you B．your C．yours D．yourself 【答案】D 【详解】句意：别把自己逼得太紧。如果你累了，就停下来休息一下。 考查代词辨析。you你(主格/宾格)；your你的(形容词性物主代词)；yours你的(名词性物主代词)；yourself你自己(反身代词)。根据此句的句意“别把自己逼得太紧”可知，此处表示“自己”，需用反身代词作宾语。故选D。 2．DIY is short for “do it ________”. It means making things by yourself. A．myself B．himself C．yourself D．ourselves 【答案】C 【详解】句意：DIY 是“你自己做”的缩写。它意味着你自己制作东西。 myself我自己；himself他自己；yourself你自己；ourselves我们自己。根据后句“It means making things by yourself.”可知，DIY的全称固定搭配为“do it yourself”。 3．—Do you know who taught ________ French? —Nobody. He learned it by ________. A．him; him B．him; himself C．his; himself D．himself; him 【答案】B 【详解】句意：——你知道是谁教他法语的吗？——没人教他。他是自学的。 him他，宾格；himself他自己，反身代词；his他的，形容词性物主代词。动词taught后面需要接人称代词宾格作宾语，指代“他”，所以用him；根据答语可知，没有人教他，他是自学的，by oneself为固定搭配，意为“独自，靠自己”，主语为“He”，反身代词应与之对应，因此应填入him；himself。 4．Penguins need to stay together to protect ________ against the terrible weather. A．them B．their C．themselves D．they 【答案】C 【详解】句意：企鹅需要待在一起以保护它们自己抵御恶劣的天气。 them它们；their它们的；themselves它们自己；they它们。根据主语“Penguins”可知是复数，且动作“protect”的承受者也是企鹅本身，当主语和宾语指代同一对象时，宾语应用反身代词。 5．Mr. Smith isn’t worried about his little daughter. She can look after ________ very well. A．himself B．herself C．yourself D．myself 【答案】B 【详解】句意：史密斯先生不担心他的小女儿。她可以把自己照顾得很好。 考查反身代词辨析。himself他自己；herself她自己；yourself你自己；myself我自己。根据前句“his little daughter”可知，主语是“她（She）”，因此反身代词应与主语“She”保持一致，用herself。故选B。 6．Allen hurt ________ when he played football yesterday. A．herself B．myself C．yourself D．himself 【答案】D 【详解】句意：艾伦昨天踢足球时伤到了自己。 考查反身代词辨析。herself她自己；myself我自己；yourself你自己；himself他自己。根据从句中的“he”可知，Allen是男生，此处需用与主语人称和性别一致的反身代词himself。故选D。 7．Everyone in my class thinks DIY work ________ is a good way to have fun and save money. A．itself B．ourselves C．themselves D．myself 【答案】A 【详解】句意：我班上的每个人都认为DIY工作本身就是一个既能获得乐趣又能省钱的好方法。 考查反身代词辨析。itself它自己；ourselves我们自己；themselves他们自己；myself我自己。根据“DIY work”可知，此处指DIY工作本身，用itself指代。故选A。 8．Self-driving cars are smart enough to follow traffic rules and park ______. A．yourselves B．them C．themselves D．ourselves 【答案】C 【详解】句意：自动驾驶汽车足够智能，能够遵守交通规则并自动停车。 考查代词辨析。yourselves你们自己；them它们；themselves它们自己；ourselves我们自己。根据“Self-driving cars”可知，此处指自动驾驶汽车能自动停车，应用反身代词themselves。故选C。 9．Welcome you all to China and enjoy ________ here. A．you B．your C．yourself D．yourselves 【答案】D 【详解】句意：欢迎你们所有人来到中国，并在这里玩得开心。 考查反身代词。you你/你们；your你的/你们的；yourself你自己；yourselves你们自己。根据句意，主语“you all”是复数，且“enjoy oneself”是固定搭配，意为“玩得开心”，此处需用复数反身代词yourselves。故选D。 10．After reading the guidebook carefully, we can make the paper-cutting _______. A．myself B．yourselves C．themselves D．ourselves 【答案】D 【详解】句意：仔细阅读了这本指南后，我们就可以自己制作剪纸。 考查反身代词辨析。myself 我自己；yourselves你们自己；themselves他们自己；ourselves我们自己。根据主语“we”可知，此处应使用与主语一致的反身代词“ourselves”。故选D。 11．— Who taught you Japanese? — Nobody. I learned it all by ________. A．I B．me C．my D．myself 【答案】D 【详解】句意：——谁教你的日语？——没人。我完全是自学的。 考查反身代词。by oneself 是固定短语，意为“独自地，靠某人自己”。主语是“I”，因此反身代词用“myself”。故选D。 12．—Let me help you with the task. —Thank you. But we can finish it on time by ________. A．myself B．ourselves C．yourselves D．themselves 【答案】B 【详解】句意：——让我来帮你做这项工作。——谢谢你！但是我们可以自己按时完成。 考查反身代词。myself我自己；ourselves我们自己；yourselves你们自己；themselves他们自己。根据“But we can finish it on time by”可知，答句强调“我们”能独立完成任务，用“ourselves”表示“我们自己”。故选B。 13．—Where did you go last Sunday? —I stayed at home and taught ________ to play the guitar. A．myself B．yourself C．himself D．herself 【答案】A 【详解】句意：——上周日你去了哪里？——我待在家里，自学了弹吉他。 考查反身代词辨析。myself我自己；yourself你自己；himself他自己；herself她自己。根据答句主语“I”可知，此处对应的反身代词是“我自己”。故选A。   14．—The paper cuttings look so nice. —Thank you. We made them by ________. A．us B．our C．ourselves 【答案】C 【详解】句意：——这些剪纸看起来真漂亮。——谢谢。是我们自己做的。 考查反身代词的用法。us我们，宾格；our我们的，形容词性物主代词；ourselves我们自己，反身代词。by oneself表示“独自”，主语是We，所以此处应用反身代词ourselves指代主语本身。故选C。 15．Lily’s parents aren’t at home today. She has to make dinner by ______. A．her B．hers C．herself 【答案】C 【详解】句意：莉莉的父母今天不在家，她得自己做饭。 考查反身代词的用法。her她的，形容词性物主代词或宾格；hers她的，名词性物主代词；herself她自己，反身代词。by oneself意为“独自”，为固定用法，所以此处用反身代词。故选C。 16．Today is Ms. Smith’s birthday, and she wants to buy ________ some beautiful flowers. A．itself B．ourselves C．herself 【答案】C 【详解】句意：今天是史密斯女士的生日，她想给自己买些漂亮的花。 考查反身代词。itself它自己；ourselves我们自己；herself她自己。此句的主语是she，反身代词要用同一人称的反身代词herself，故选C。 17．The little girl can look after ________ when her parents are out. A．herself B．himself C．myself D．themselves 【答案】A 【详解】句意：这个小女孩在父母外出时可以照顾自己。 考查反身代词的用法。herself她自己；himself他自己；myself我自己；themselves他们自己。主语“the little girl”是女性且为第三人称单数，需用对应的反身代词“herself”。故选A。 18．In my city, many cars are smart. They can drive ________. A．itself B．themselves C．ourselves 【答案】B 【详解】句意：在我的城市，很多汽车都是智能的。它们可以自己驾驶。 考查反身代词辨析。itself它自己；themselves它们自己；ourselves我们自己。根据主语“They”可知，此处应用复数形式“它们自己”的反身代词，故选B。 19．The boy could tell the stories by ________ when he was four. A．him B．himself C．his 【答案】B 【详解】句意：这个男孩四岁时就能自己讲故事了。 考查代词辨析。him他，宾格；himself他自己，反身代词；his他的，形容词性物主代词或名词性物主代词。by oneself为固定短语，意为“独自，靠自己”，此处指男孩自己讲故事，应用反身代词himself，故选B。 20．You should learn to look after ________. A．yourself B．you C．your D．yours 【答案】A 【详解】句意：你应该学着去照顾你自己。 考查代词辨析。yourself你自己，反身代词；you你/你们，主格或宾格；your你的/你们的，形容词性物主代词；yours你的/你们的，名词性物主代词。根据句意可知，此处建议对方学着照顾“自己”，用反身代词yourself。故选A。 21．The five-week course can help you express ________ in a natural way. A．you B．your C．yours D．yourself 【答案】D 【详解】句意：为期五周的课程能够帮助你以一种自然的方式表达你自己。 考查代词辨析。you你、你们，主格或宾格形式；your你的、你们的，形容词性物主代词；yours你的、你们的，名词性物主代词；yourself你自己，反身代词。根据“The five-week course can help you express...in a natural way.”可知，这里需要一个反身代词来表示“你自己”，强调课程帮助“你自身”以自然的方式进行表达。“express oneself”是一个固定搭配，意为“表达自己的想法或感受”。此处使用反身代词“yourself”意为“你自己”，符合语境。故选D。 22．— David made plans to exercise and read books every day to improve ________. — That’s good! I also decided to care more about ________ health. A．him；my B．him；myself C．himself；my D．himself；myself 【答案】C 【详解】句意：——大卫制定了每天锻炼和读书的计划来提高自己。——太好了！我也决定更关心自己的健康。 考查代词辨析。him他，人称代词宾格；himself他自己，反身代词；my我的，形容词性物主代词；myself我自己，反身代词。根据句中“made plans to exercise and read books”提示，此处指的是提高自己，第一空应填反身代词，A、B选项可排除。第二空后为名词“health”，故此处应用形容词性物主代词修饰名词，故选C。 23．Don’t help Jim do housework any more. He can do it ________. A．myself B．herself C．himself D．yourself 【答案】C 【详解】句意：别再帮吉姆做家务了。他可以自己做。 考查代词辨析。myself我自己；herself她自己；himself他自己；yourself你自己。根据“He can do it”可知，他可以自己做，用反身代词himself。故选C。 24．My home is ________ the post office. I can walk there in two minutes. A．far from B．next to C．between D．across 【答案】B 【详解】句意：我家在邮局旁边。我两分钟就能走到那里。 far from远离；next to紧挨着；between在……之间；across穿过。“I can walk there in two minutes.”可知家离邮局很近，应填next to。 25．The girl is standing ________ the door, so I can’t see her face. A．in front of B．behind C．next to D．across from 【答案】B 【详解】句意：那个女孩站在门后面，所以我看不见她的脸。 in front of在……前面；behind在……后面；next to在……旁边；across from在……对面。根据“so I can’t see her face”可知，女孩站在门后面。behind符合句意。 26．The restaurant is ________ the corner of Main Street and Park Road. A．in B．at C．on D．to 【答案】C 【详解】句意：这家餐厅在主街和公园路的拐角处。 in在……里面；at在（某处）；on在……上面；to到。表示在具体的街角用固定搭配“on the corner of”，应填at。 27．Go ________ the bridge, and you will see the park on your left. A．across B．along C．through D．behind 【答案】A 【详解】句意：穿过这座桥，你就会看到公园在你的左边。 across穿过；along沿着；through通过；behind在……的后面。本句表示从桥的表面横穿过去，across符合句意。 28．We can see a new post ________ the blog ________ our class project. A．from; to B．on; about C．between; and 【答案】B 【详解】句意：我们可以在博客上看到一篇关于我们班级项目的新帖子。 from从……；to到……；on在……上；about关于；between...and...在……和……之间。根据“see a new post... the blog”可知，在博客上用介词on；根据“our class project”可知，关于班级项目用介词about。 29．You can’t see Lucy because she is ________ a tree. A．under B．behind C．near D．next to 【答案】B 【详解】句意：你看不见露西，因为她在树的后面。 考查介词辨析。under在……下面；behind在……后面；near在……附近；next to紧挨着。根据“You can’t see Lucy”可知，露西在树的后面才看不见，其他选项均不能完全遮挡视线。故选B。 30．The oranges are _________ the tree and a bird is _________ the tree. A．on; in B．in; on C．in; in D．on; at 【答案】A 【详解】句意：橘子长在树上，树上有一只鸟。 考查介词词义辨析。on在……上，强调与某物接触，可指树本身生长的东西；in在……里面，可指不是树本身生长的东西；at在，后跟小地点。 根据“The oranges”可知，第一空指树本身生长的东西，用介词on；第二空“a bird”并不是树本身生长的东西，用介词in。故选A。 31．In my family photo, you can see my mother is ________ my left. A．on B．in C．under D．from 【答案】A 【详解】句意：在我的家庭照片中，你可以看到我的妈妈在我的左边。 考查介词辨析。on 在……上面；in在……里面；under在……下面；from从。根据“you can see my mother is…my left.”可知，此处表示方位，表示“在某人的左边”常用介词“on”，故选A。 32．—Where’s my pet cat? I can’t find it. —Look! It’s ________ the tree. A．in B．on C．in the front of D．at back of 【答案】A 【详解】句意：——我的宠物猫在哪里？我找不到它。——看！它在树上。 考查介词辨析。in the tree在树上，外来事物；on the tree在树上，树本身的事物；in the front of在……前面，物体内部的；at back of表述错误，应为at the back of在……的后面。根据“pet cat”可知，是外来事物，用in。故选A。 33．Open the box, Sarah. You will find a nice hat ________ it. A．above B．on C．inside D．beside 【答案】C 【详解】句意：打开盒子，莎拉。你会发现里面有一顶漂亮的帽子。 考查介词辨析。above在……上；on在上面；inside在……里面；beside在旁边。根据前面的“Open the box”以及选项可知，此处是指在盒子里发现一顶漂亮的帽子。故选C。 34．The Yangtze River is very long and most of it runs ________ mountains. A．by B．across C．above D．through 【答案】D 【详解】句意：长江非常长，大部分河段穿行于群山之中。 考查介词辨析。by在……旁边；across横穿表面；above在……上方；through穿过内部或空间。根据“mountains”可知，长江是穿越山脉内部流淌，强调空间上的贯穿，用through。故选D。 35．Yuexiu District lies ________ Baiyun Mountain and the Pearl River. A．on B．between C．behind D．in front of 【答案】B 【详解】句意：越秀区位于白云山和珠江之间。 考查方位介词辨析和常识。on在……上；between在……之间；behind在……后面；in front of在……前面。根据“Baiyun Mountain and the Pearl River”和地理常识可知，越秀区位于白云山和珠江之间的地带。故选B。 36．The app shows that Bus No.3 is about 5 km ________ of the bus stop. There is no ________ in worrying. A．east; point B．the east; point C．east; need D．the east; need 【答案】A 【详解】句意：应用程序显示，3路公交车在公交站以东约5公里处。没必要担心。 考查方位词和固定句型。There is no need to do sth.“没有必要做某事”；There is no point in doing sth.“做某事没有意义”。“east”作副词时，表示“向东；在东方” ，“Bus No.3 is about 5 km east of the bus stop.”意思是“3 路公交车在公交车站以东大约 5 公里处” ，此时“east”直接用于表示方向，前面不需要加定冠词“the” ；“There is no point in doing sth.”是固定句型，意为“做某事没有意义”，此处是说没必要担心，所以用point。故选A。 37．We all like to have a beautiful school ________ many tall trees ________ it. A．has; around B．with; around C．has; with D．with; above 【答案】B 【详解】句意：我们都喜欢有一个美丽的学校，周围有许多高大的树。 考查介词的使用。has有，动词；with有，介词；around在……周围；above在……上方。根据“a beautiful school… many trees”可知，第一个空需要一个介词来表示“拥有”或“带有”的意思，因此“with”是最合适的选择。根据“trees… it”可知，第二个空需要一个介词来描述树的位置，因此“around”是最合适的选择。故选B。 38．I live ________ No. 100, Zhongshan Road. What’s your address? A．/ B．in C．at D．on 【答案】C 【详解】句意：我住在中山路100号。你的地址是什么？ 考查介词辨析。in在某较大的地点里；at在某小地点；on两地接壤时使用。根据“No. 100, Zhongshan Road”可知是具体街道牌号，前面用at。故选C。 39．—Is there a bank near here? —Yes. It’s ________ this shop. Just cross (穿过) the road. A．across from B．next to C．in front of 【答案】A 【详解】句意：——附近有银行吗？——有的。在这个商店对面。过马路就行了。 考查介词短语。across from在……对面；next to挨着；in front of在……前面。根据“Just cross the road”可知，银行在商店对面，故选A。 40．Fu Xing is a tall girl. I sit ________ her, so I can’t see the blackboard. A．behind B．close to C．in front of D．in the front of 【答案】A 【详解】句意：傅星是个高个子女孩，我坐在她后面，所以我看不见黑板。 考查介词。behind在……后面；close to靠近；in front of在……前面；in the front of在……（内部）前面。根据“I can’t see the blackboard.”可知，因为坐在傅星后面，所以看不见黑板，故选A。 二、单词拼写(本大题共10小题，每小题2分，共20分) 41．I cooked these delicious dishes all by ________ (I). 【答案】myself 【详解】句意：这些美味的菜肴都是我独自烹饪的。I“我”，by oneself是固定短语，因此填反身代词myself。 42．We enjoyed ______ (we) at the amusement park yesterday. 【答案】ourselves 【详解】句意：我们昨天在游乐园玩得很开心。we是人称代词的主格，意为“我们”。enjoy oneself为固定搭配，表示“玩得开心”，we对应的反身代词为ourselves。 43．Penguins gather together to warm _________ in cold weather. (they) 【答案】themselves 【详解】句意：企鹅在寒冷的天气里聚集在一起相互取暖。“warm”在此处作动词，意为“使温暖”。主语“Penguins”为复数，且动作在群体间相互进行，需用反身代词“themselves”表示“它们自己”。 44．Boys and girls, believe in ________ (you). 【答案】yourselves 【详解】句意：孩子们，要相信你们自己。本句为祈使句，固定搭配“believe in oneself”，表示“相信某人自己”，前面的“Boys and girls”提示对象为复数形式，需用反身代词的复数形式yourselves。 45．He likes to do things by ________ (he). 【答案】himself 【详解】句意：他喜欢自己独自做事情。句中“by oneself”是固定短语，表示“独自地，靠自己”，这里主语是“He”，对应的反身代词是“himself”，故填himself。 46．We should be honest with ________ (we) and others. 【答案】ourselves 【详解】句意：我们应该对自己和他人诚实。介词“with”后需接宾语，且根据句意“对我们自己诚实”，需用反身代词。“we”的反身代词为“ourselves”。 47．Teachers ask their students to do things by ________ at home. (they) 【答案】themselves 【详解】句意：老师们要求他们的学生在家独立完成事情。根据“by”和括号内提示词可知，此处需用反身代词themselves构成短语by oneself“独自”。故填themselves。 48．—Who taught _______ (you) English? —I taught _______ (I). 【答案】 you myself 【详解】句意：——谁教你英语？——我自学。根据“taught”可知，第一空作动词的宾语，应用宾格形式，you“你”，主格/宾格，故第一空填you；根据“I taught...”可知，第二空表示“自学”，应用反身代词，I的反身代词是myself“我自己”，故第二空填myself。故填you；myself。 49．The park is very beautiful. We will enjoy ________ (our) there. 【答案】ourselves 【详解】句意：这个公园非常漂亮。我们会在那里玩得很开心。enjoy oneself“玩得开心”，是固定搭配，此处用反身代词ourselves。故填ourselves。 50．I never cooked anything ________ (I). 【答案】myself 【详解】句意：我从没自己做过任何食物。根据提示可知，此处需用“I”对应的反身代词“myself”，在句中用于强调“我自己”完成“做饭”的动作，故填myself。 答案第1页，共2页 答案第1页，共2页 学科网（北京）股份有限公司 $ Unit 4 Our animal friends 核心语法精练（反身代词和方位介词） （时间：40分钟，满分：100分） 一、单项选择(本大题共40小题，每小题2分，共80分) 1．Don’t push ________ too hard. If you’re tired, stop to have a rest. A．you B．your C．yours D．yourself 2．DIY is short for “do it ________”. It means making things by yourself. A．myself B．himself C．yourself D．ourselves 3．—Do you know who taught ________ French? —Nobody. He learned it by ________. A．him; him B．him; himself C．his; himself D．himself; him 4．Penguins need to stay together to protect ________ against the terrible weather. A．them B．their C．themselves D．they 5．Mr. Smith isn’t worried about his little daughter. She can look after ________ very well. A．himself B．herself C．yourself D．myself 6．Allen hurt ________ when he played football yesterday. A．herself B．myself C．yourself D．himself 7．Everyone in my class thinks DIY work ________ is a good way to have fun and save money. A．itself B．ourselves C．themselves D．myself 8．Self-driving cars are smart enough to follow traffic rules and park ______. A．yourselves B．them C．themselves D．ourselves 9．Welcome you all to China and enjoy ________ here. A．you B．your C．yourself D．yourselves 10．After reading the guidebook carefully, we can make the paper-cutting _______. A．myself B．yourselves C．themselves D．ourselves 11．— Who taught you Japanese? — Nobody. I learned it all by ________. A．I B．me C．my D．myself 12．—Let me help you with the task. —Thank you. But we can finish it on time by ________. A．myself B．ourselves C．yourselves D．themselves 13．—Where did you go last Sunday? —I stayed at home and taught ________ to play the guitar. A．myself B．yourself C．himself D．herself 14．—The paper cuttings look so nice. —Thank you. We made them by ________. A．us B．our C．ourselves 15．Lily’s parents aren’t at home today. She has to make dinner by ______. A．her B．hers C．herself 16．Today is Ms. Smith’s birthday, and she wants to buy ________ some beautiful flowers. A．itself B．ourselves C．herself 17．The little girl can look after ________ when her parents are out. A．herself B．himself C．myself D．themselves 18．In my city, many cars are smart. They can drive ________. A．itself B．themselves C．ourselves 19．The boy could tell the stories by ________ when he was four. A．him B．himself C．his 20．You should learn to look after ________. A．yourself B．you C．your D．yours 21．The five-week course can help you express ________ in a natural way. A．you B．your C．yours D．yourself 22．— David made plans to exercise and read books every day to improve ________. — That’s good! I also decided to care more about ________ health. A．him；my B．him；myself C．himself；my D．himself；myself 23．Don’t help Jim do housework any more. He can do it ________. A．myself B．herself C．himself D．yourself 24．My home is ________ the post office. I can walk there in two minutes. A．far from B．next to C．between D．across 25．The girl is standing ________ the door, so I can’t see her face. A．in front of B．behind C．next to D．across from 26．The restaurant is ________ the corner of Main Street and Park Road. A．in B．at C．on D．to 27．Go ________ the bridge, and you will see the park on your left. A．across B．along C．through D．behind 28．We can see a new post ________ the blog ________ our class project. A．from; to B．on; about C．between; and 29．You can’t see Lucy because she is ________ a tree. A．under B．behind C．near D．next to 30．The oranges are _________ the tree and a bird is _________ the tree. A．on; in B．in; on C．in; in D．on; at 31．In my family photo, you can see my mother is ________ my left. A．on B．in C．under D．from 32．—Where’s my pet cat? I can’t find it. —Look! It’s ________ the tree. A．in B．on C．in the front of D．at back of 33．Open the box, Sarah. You will find a nice hat ________ it. A．above B．on C．inside D．beside 34．The Yangtze River is very long and most of it runs ________ mountains. A．by B．across C．above D．through 35．Yuexiu District lies ________ Baiyun Mountain and the Pearl River. A．on B．between C．behind D．in front of 36．The app shows that Bus No.3 is about 5 km ________ of the bus stop. There is no ________ in worrying. A．east; point B．the east; point C．east; need D．the east; need 37．We all like to have a beautiful school ________ many tall trees ________ it. A．has; around B．with; around C．has; with D．with; above 38．I live ________ No. 100, Zhongshan Road. What’s your address? A．/ B．in C．at D．on 39．—Is there a bank near here? —Yes. It’s ________ this shop. Just cross (穿过) the road. A．across from B．next to C．in front of 40．Fu Xing is a tall girl. I sit ________ her, so I can’t see the blackboard. A．behind B．close to C．in front of D．in the front of 二、单词拼写(本大题共10小题，每小题2分，共20分) 41．I cooked these delicious dishes all by ________ (I). 42．We enjoyed ______ (we) at the amusement park yesterday. 43．Penguins gather together to warm _________ in cold weather. (they) 44．Boys and girls, believe in ________ (you). 45．He likes to do things by ________ (he). 46．We should be honest with ________ (we) and others. 47．Teachers ask their students to do things by ________ at home. (they) 48．—Who taught _______ (you) English? —I taught _______ (I). 49．The park is very beautiful. We will enjoy ________ (our) there. 50．I never cooked anything ________ (I). 答案第1页，共2页 答案第1页，共2页 学科网（北京）股份有限公司 $