Unit 2 Improving yourself 单词短语句型语法（教材考点精练）英语外研版2019选择性必修第二册

Unit 2 Improving yourself 教材考点精练 单元重点单词短语句型语法 (时间：60分钟，满分：100分) 一、用括号内所给单词的适当形式填空(本大题共40小题，每小题1分，共40分) 1. Milk rounds are threatened as customers switch to ________ (buy) from supermarkets. 2. She is fully occupied ________her work, so she spares no time for a holiday. 3. Many stations have wheelchair access ________ the car park or entrance to the station platforms. 4. As he lacks relevant experience, you can’t rely on him ________ (perform) the task. 5. It’s necessary for you to make your child know that you expect him to act ________ (appropriate) towards other people. 6. I think we paid too much for the house, ________ (consider) that we needed to get the roof repaired. 7. We want our son to have a good education that will equip him ________future life. 8. My older sister is considering ________ (change) her present job. 9. This has led companies and individuals to donate money to developing countries to buy computer ________ (equip) and Internet facilities. 10. People have better access ________health care than they used to. 11. It is not appropriate that a student ________ (litter) and scribble about. 12. She is always polite and ________ (consider) towards her employees. 13. Not only is biking good exercise, but ________ (switch) from a car to a bike also reduces the amount of pollution in the air. 14. ________we will go there or not tomorrow depends on the weather. 15. You’d better decide for yourself whether________ (go) or not. 16. Of those Australians who still have a landline, a third concede that it’s not really necessary and they’re keeping it as a ________ (secure) blanket—19 percent say they never use it while a further 13 percent keep it in case of emergencies. 17. After spending some time looking at all the defensive ________ (equip) at the wall, we decided it was time for some action and what better than to ride on a piece of history! 18. Many people now misunderstand emotional intelligence as almost everything desirable in a person’s makeup that cannot be measured by an IQ test, such as character, ________ (motivate), confidence, mental stability, optimism and “people skills”． 19. If we admit it is a door, they’ll want to go outside ________ (constant)． 20. He has calmed down and can look at what has happened more ________ (objective)． 21. The company will have to make an enormous ________ (invest) to computerise production. 22. You can rely ________it that he will take good care of your pet dog while you are away. 23．Helen was fully ________ (occupy) with business matters, so we didn’t want to bother her. 24．The course is designed ________( equip) students for a career in nursing and deal with emergencies. 25．We should put ________our differences and discuss the things we have in common. 26．I have so much credit­card debt; I maxed them ________to pay for my training. 27．The old woman found her purse ________ (steal) while she was doing some shopping. 28．He was very excited to hear the news that he ________ (promote)． 29．He arrived at the company happily, only to find that he ________ (fire)． 30．The two nurses________ (reward) 100,000 yuan by the police but they donated it to victims of the explosion. 31．By the time he died in 2016, Ali ________ (recognize) as one of the greatest boxers of all time. 32．All the wooden fences around the campus ________（tear）down by the time Jack returned to school from home. 33．All the rubbish ________ (clean) out by the time he went to see the movie Hi, Mom. 34．By the time the city half-marathon began, all potential problems ________(handle) carefully. 35．When Li Ming hurried home, he found that his mother ________ (not send) to hospital yet. 36．The boy ________ (notice) stealing a bike by the police，so he was taken to the police station. 37．It was an amazing achievement for a player who ________ (injure) so recently. 38. By the time we arrived at the cinema, the movie ________ (start) for 15 minutes. 39. The documents ________ (sign) by the manager before the meeting began yesterday. 40. Hardly ________ (he/take) his seat when the lights in the auditorium dimmed. 二、根据句意及首字母或汉语提示完成单词(本大题共30小题，每小题1分，共30分) 1. The charity focuses on raising drug abuse a________ (意识) 2. After failing three times, he finally t________ in the towel (认输) 3. The old system needs to be u________ (更新) to the latest version. 4. She couldn’t t________ (忍受) the noise any longer. 5. The meeting l________ (持续) for over four hours. 6. He’s c________ (不断地) checking his phone during class. 7. The room had been o________ (占用) when we arrived. 8. The team m________ (设法完成) to finish the project on time. 9. Stop p________ (沾染) up bad habits from your friends. 10. The app helps users m________ (管理) their budgets wisely. 11. The fifth floor is for the s________ (社交) media department. 12. She’s tired o________ (精疲力尽) after working 12 hours straight. 13. The program teaches kids to r________ (依靠) on themselves. 14. We need e________ (设备) for the science experiment. 15. The news spread quickly through s________ (社交) media. 16. He’s c________ (不停地) interrupting the speaker. 17. The report h________ (碰巧) to be on my desk. 18. The store accepts various payment a________ (账户). 19. The project r________ (需要) careful planning. 20. She’s learning to be in c________ (控制) of her emotions. 21. The campaign aims to e________ (鼓励) healthy eating. 22. The software needs to be t________ (打开) on manually. 23. They’re making g________ (好的) use of solar energy. 24. The study focuses on y________ (年轻) generations. 25. The book teaches l________ (终身) values. 26. The program e________ (装备) students with skills. 27. The event r________ (代表) a new beginning. 28. She believes in k________ (善意) to strangers. 29. The course o________ (客观地) analyzes the data. 30. The system i________ (涉及) complex calculations. 三、完成句子(本大题共15小题，每小题2分，共30分) 1. 这位年轻的主持人被提升为电视台的台长了。 The young moderator ________________ the head of a television station. 2. 经过三个月的康复治疗，他终于戒除了毒瘾。 After three months of treatment, he finally ________________ drug addiction. 3. 学生们正在充分利用图书馆资源完成研究项目。 The students are ________________ the library resources for their research project. 4. 请查看我们网站上的最新公告。 Please ________________ the latest announcements on our website. 5. 尽管遇到困难，他们从未放弃筹款活动。 Despite difficulties, they never threw in the towel on the ________________. 6. 现代年轻人更倾向于使用电子支付。 The ________________ prefer to use digital payment methods. 7. 这个应用程序帮助你明智地管理零花钱。 This app helps you ________________ wisely. 8. 经过反思，我意识到自己犯了严重的错误。 ________________, I realized I had made a serious mistake. 9. 志愿者们在灾区发放生活必需品。 Volunteers are ________________ in the disaster area. 10. 这项技术让远程工作变得更加容易。 This technology has ________________. 11. 她不断刷新页面查看最新消息。 She kept refreshing the page to ________________ the latest news. 12. 总共有一百多人参加了这次慈善跑。 ________________ over 100 people participated in the charity run. 13. 贫困家庭经常面临食物短缺的问题。 Poor families are often ________________ food shortages. 14. 这些课程教会孩子们重要的生活价值观。 These courses taught children important ________________. 15. 他每月存钱是为了将来的创业计划。 He’s ________________ every month for his future business plan. ( 4 / 5 学科网（北京）股份有限公司 ) 学科网（北京）股份有限公司 $$ Unit 2 Improving yourself 教材考点精练 单元重点单词短语句型语法 (时间：60分钟，满分：100分) 一、用括号内所给单词的适当形式填空(本大题共40小题，每小题1分，共40分) 1. Milk rounds are threatened as customers switch to ________ (buy) from supermarkets. 【答案】buying 【详解】考查非谓语动词。句意：由于顾客转向从超市购买，送奶服务受到威胁。根据句意和括号内提示，此处需要动词buy的动名词形式buying，作介词to的宾语，表示"转向做某事"。故填buying。 2. She is fully occupied ________her work, so she spares no time for a holiday. 【答案】with 【详解】考查固定搭配。句意：她忙于工作，所以没时间度假。根据句意和括号内提示，此处需要介词with与occupied构成固定搭配be occupied with"忙于"。故填with。 3. Many stations have wheelchair access ________ the car park or entrance to the station platforms. 【答案】from 【详解】考查介词搭配。句意：许多车站从停车场或入口处设有轮椅通道。根据句意和括号内提示，此处需要介词from表示"从...处"，与access构成固定搭配have access from。故填from。 4. As he lacks relevant experience, you can’t rely on him ________ (perform) the task. 【答案】to perform 【详解】考查非谓语动词。句意：由于他缺乏相关经验，你不能指望他完成这项任务。根据句意和括号内提示，此处需要动词不定式to perform作宾语补足语，构成rely on sb. to do sth.结构。故填to perform。 5. It’s necessary for you to make your child know that you expect him to act ________ (appropriate) towards other people. 【答案】appropriately 【详解】考查词性转换。句意：你有必要让孩子知道，你希望他以恰当的方式对待他人。根据句意和括号内提示，此处需要形容词appropriate的副词形式appropriately修饰动词act。故填appropriately。 6. I think we paid too much for the house, ________ (consider) that we needed to get the roof repaired. 【答案】considering 【详解】考查非谓语动词。句意：考虑到我们需要修理屋顶，我认为这房子买贵了。根据句意和括号内提示，此处需要现在分词considering作状语，表示"考虑到"。故填considering。 7. We want our son to have a good education that will equip him ________future life. 【答案】for 【详解】考查固定搭配。句意：我们希望儿子接受良好的教育，为未来生活做好准备。根据句意和括号内提示，此处需要介词for与equip构成固定搭配equip sb. for sth."为...做准备"。故填for。 8. My older sister is considering ________ (change) her present job. 【答案】changing 【详解】考查非谓语动词。句意：我姐姐正在考虑换工作。根据句意和括号内提示，此处需要动词change的动名词形式changing，作动词consider的宾语。故填changing。 9. This has led companies and individuals to donate money to developing countries to buy computer ________ (equip) and Internet facilities. 【答案】equipment 【详解】考查词性转换。句意：这促使公司和个人向发展中国家捐款购买电脑设备和网络设施。根据句意和括号内提示，此处需要动词equip的名词形式equipment作宾语。故填equipment。 10. People have better access ________health care than they used to. 【答案】to 【详解】考查固定搭配。句意：人们现在比过去更容易获得医疗保健服务。根据句意和括号内提示，此处需要介词to与access构成固定搭配have access to"获得"。故填to。 11. It is not appropriate that a student ________ (litter) and scribble about. 【答案】(should) litter 【详解】考查虚拟语气。句意：学生随地乱扔乱画是不合适的。根据句意和括号内提示，此处需要使用虚拟语气，构成It is appropriate that sb. (should) do结构。故填(should) litter。 12. She is always polite and ________ (consider) towards her employees. 【答案】considerate 【详解】考查词性转换。句意：她对员工总是礼貌而体贴。根据句意和括号内提示，此处需要动词consider的形容词形式considerate"体贴的"作表语。故填considerate。 13. Not only is biking good exercise, but ________ (switch) from a car to a bike also reduces the amount of pollution in the air. 【答案】switching 【详解】考查非谓语动词。句意：骑自行车不仅是很好的锻炼，而且从开车改为骑车还能减少空气污染。根据句意和括号内提示，此处需要动词switch的动名词形式switching作主语。故填switching。 14. ________we will go there or not tomorrow depends on the weather. 【答案】Whether 【详解】考查连词。句意：我们明天是否去那里取决于天气。根据句意和括号内提示，此处需要连词Whether引导主语从句，表示"是否"。故填Whether。 15. You’d better decide for yourself whether________ (go) or not. 【答案】to go 【详解】考查非谓语动词。句意：你最好自己决定去还是不去。根据句意和括号内提示，此处需要动词不定式to go与whether构成whether to do结构作宾语。故填to go。 16. Of those Australians who still have a landline, a third concede that it’s not really necessary and they’re keeping it as a ________ (secure) blanket—19 percent say they never use it while a further 13 percent keep it in case of emergencies. 【答案】security 【详解】考查词性转换。句意：在那些仍在使用固定电话的澳大利亚人中，有三分之一承认这并非必要，他们保留它只是作为心理安慰。根据句意和括号内提示，此处需要形容词secure的名词形式security修饰blanket，构成security blanket"心理安慰"。故填security。 17. After spending some time looking at all the defensive ________ (equip) at the wall, we decided it was time for some action and what better than to ride on a piece of history! 【答案】equipment 【详解】考查词性转换。句意：我们花了一些时间查看城墙上的所有防御装备后，决定是时候采取行动了，还有什么比骑上一段历史更好的呢！根据句意和括号内提示，此处需要动词equip的名词形式equipment作宾语。故填equipment。 18. Many people now misunderstand emotional intelligence as almost everything desirable in a person’s makeup that cannot be measured by an IQ test, such as character, ________ (motivate), confidence, mental stability, optimism and “people skills”． 【答案】motivation 【详解】考查词性转换。句意：现在许多人将情商误解为几乎包含了一个人素质中所有无法用智商测试衡量的可取之处，比如性格、动机、信心、心理稳定性、乐观和"人际交往能力"。根据句意和括号内提示，此处需要动词motivate的名词形式motivation与character, confidence等并列作宾语。故填motivation。 19. If we admit it is a door，they’ll want to go outside ________ (constant)． 【答案】constantly 【详解】考查词性转换。句意：如果我们承认那是一扇门，他们就会一直想出去。根据句意和括号内提示，此处需要形容词constant的副词形式constantly修饰动词go。故填constantly。 20. He has calmed down and can look at what has happened more ________ (objective)． 【答案】objectively 【详解】考查词性转换。句意：他已经冷静下来，能够更客观地看待发生的事情。根据句意和括号内提示，此处需要形容词objective的副词形式objectively修饰动词短语look at。故填objectively。 21. The company will have to make an enormous ________ (invest) to computerise production. 【答案】investment 【详解】考查词性转换。句意：公司将不得不投入巨资实现生产计算机化。根据句意和括号内提示，此处需要动词invest的名词形式investment作宾语。故填investment。 22. You can rely ________it that he will take good care of your pet dog while you are away. 【答案】on 【详解】考查固定搭配。句意：你可以放心，你不在的时候他会好好照顾你的宠物狗。根据句意和括号内提示，此处需要介词on与rely构成固定搭配rely on"依赖，相信"。故填on。 23．Helen was fully ________ (occupy) with business matters, so we didn’t want to bother her. 【答案】occupied 【详解】考查词性转换。句意：海伦忙于商务，所以我们不想打扰她。根据句意和括号内提示，此处需要动词occupy的形容词形式occupied与with构成固定搭配be occupied with"忙于"。故填occupied。 24．The course is designed ________( equip) students for a career in nursing and deal with emergencies. 【答案】to equip 【详解】考查非谓语动词。句意：该课程旨在培养学生从事护理职业和处理紧急情况的能力。根据句意和括号内提示，此处需要动词不定式to equip作目的状语。故填to equip。 25．We should put ________our differences and discuss the things we have in common. 【答案】aside 【详解】考查固定搭配。句意：我们应该搁置分歧，讨论我们的共同点。根据句意和括号内提示，此处需要副词aside与put构成固定搭配put aside"搁置"。故填aside。 26．I have so much credit­card debt; I maxed them ________to pay for my training. 【答案】out 【详解】考查固定搭配。句意：我有太多信用卡债务；为了支付培训费用，我把信用卡刷爆了。根据句意和括号内提示，此处需要副词out与max构成固定搭配max out"达到极限"。故填out。 27．The old woman found her purse ________ (steal) while she was doing some shopping. 【答案】had been stolen##stolen 【详解】考察动词时态和语态。句意：老妇人在购物时发现她的钱包被偷了。found后面接宾语从句，her purse作从句的主语，和steal之间为被动关系，且这个动作发生在老妇人发现之前，即过去的过去，故应用过去完成时的被动语态；也可以只用steal的过去分词，作宾语补足语。故填had been stolen/stolen。 28．He was very excited to hear the news that he ________ (promote)． 【答案】had been promoted 【详解】考查时态和语态。句意：他听到自己升职的消息很兴奋。分析句子结构可知，空格处应填谓语动词，且promote与主语he之间的关系为被动，根据句意可知，从句中的动作应发生在主句动作之前，主句谓语动词为过去式，所以此处应用过去完成时的被动语态，所以应填had been promoted。故填had been promoted。 29．He arrived at the company happily, only to find that he ________ (fire)． 【答案】had been fired 【详解】考查动词时态语态。句意：他高兴地来到公司，却发现自己被解雇了。分析句子结构可知，that引导的宾语从句缺少谓语动词，fire发生在arrived at之前，表示“过去的过去”，使用过去完成时，he和fire为被动关系，使用被动语态。故填had been fired。 30．The two nurses________ (reward) 100,000 yuan by the police but they donated it to victims of the explosion. 【答案】had been rewarded 【详解】考查时态和语态。句意：这两位护士被警方奖赏100000元，但是她们把钱捐给了爆炸事故的受害者。根据“but donated it to victims of the explosion”可知“她们把钱捐给了爆炸事故的受害者”已经是发生在过去的事情，而“两位护士被警方奖赏100000元”是发生在过去的过去，故用过去完成时，且“两位护士”和“奖赏”是被动关系，故用被动语态，空格处是过去完成时的被动语态，即had been done，故填had been rewarded。 31．By the time he died in 2016, Ali ________ (recognize) as one of the greatest boxers of all time. 【答案】had been recognized 【详解】考查时态。句意：2016年阿里去世时，他被公认为是有史以来最伟大的拳击手之一。根据By the time he died in 2016可知，应用过去完成时。recognize和主语之间是被动关系 ，应用过去完成的被动语态。故填had been recognized。 32．All the wooden fences around the campus ________（tear）down by the time Jack returned to school from home. 【答案】had been torn 【详解】考查时态和语态。句意：杰克从家回到学校时，校园周围所有的木栅栏都被拆掉了。空处为主句谓语动词，根据时间状语从句 by the time Jack returned to school from home. 可知，主句动作发生在过去的过去，应用过去完成时，且主语wooden fences和tear down之间为被动关系，应用过去完成时的被动语态。故填had been torn。 33．All the rubbish ________ (clean) out by the time he went to see the movie Hi, Mom. 【答案】had been cleaned 【详解】考查谓语动词时态语态。句意：当他去看电影《你好，李焕英》的时候，所有的垃圾都被清理干净了。分析句子，该空所给动词clean在主句中作谓语，主语为rubbish，应为被动语态；by the time引导的时间状语从句使用了一般过去时态，则垃圾被清理是在去看电影之前，即过去的过去，应使用过去完成时。故填had been cleaned。 34．By the time the city half-marathon began, all potential problems ________(handle) carefully. 【答案】had been handled 【详解】考查时态语态。句意：当城市半程马拉松开始时，所有可能的问题都得到了认真处理。主句缺少谓语，by the time+过去时间，主句用过去完成时，主句主语all potential problems和谓语handle是被动关系，用过去完成时的被动语态（had been done）。故填had been handled。 35．When Li Ming hurried home, he found that his mother ________ (not send) to hospital yet. 【答案】hadn’t been sent 【详解】考查过去完成时的被动语态。句意：当李明匆忙回家时，他发现他的母亲还没有被送进医院。由yet可知，句子用完成时，根据句意可知，李明匆忙回家时，他的母亲还没有被送进医院，found是过去式，因此空格处用过去完成时表示发生在过去的过去的动作，他的妈妈是被送到医院，且还没有被送到医院，因此空格处用过去完成时的被动语态的否定式，即hadn’t been done，故填hadn’t been sent。 36．The boy ________ (notice) stealing a bike by the police，so he was taken to the police station. 【答案】had been noticed 【详解】考查过去完成时态的被动语态。句意：那个男孩偷自行车被警察发现了，所以他被带到警察局去了。根据句意可知，在他被带到警察局之前，男孩被警察发现偷自行车，he was taken是一般过去时，因此空格处的动作发生在过去的过去，应用过去完成时，且他是被发现，因此空格处用过去完成时的被动语态，即had been done，故填had been noticed。 37．It was an amazing achievement for a player who ________ (injure) so recently. 【答案】had been injured 【详解】考查时态和语态。句意：对于一个最近受伤的球员来说，这是一个惊人的成就。先行词a player后接定语从句who 　　　　　　　　 (injure) so recently，从句缺乏谓语，由 recently且从句动作injure发生在主句动作was之前可知，即“过去的过去”，时态用过去完成时，先行词a player在从句中作主语，与从句谓语injure是被动关系，用过去完成时的的被动语态。故填had been injured。 38. By the time we arrived at the cinema, the movie ________ (start) for 15 minutes. 【答案】had been running 【详解】考查过去完成进行时。句意：当我们到达电影院时，电影已经开场15分钟了。"By the time"引导的时间状语从句使用一般过去时（arrived），主句动作"start"发生在"arrived"之前且持续进行，故用had been doing结构。 39. The documents ________ (sign) by the manager before the meeting began yesterday. 【答案】had been signed 【详解】考查过去完成时被动语态。句意：这些文件在昨天会议开始前已被经理签署。主句动作"began"为过去时，"sign"发生在更早的过去且文件是被签署的对象，故用had been done结构。 40. Hardly ________ (he/take) his seat when the lights in the auditorium dimmed. 【答案】had he taken 【详解】考查倒装句与过去完成时。句意：他刚一坐下，礼堂的灯光就暗了。"Hardly...when..."结构需部分倒装，且"take seat"发生在"dimmed"之前，故用had he taken。 二、根据句意及首字母或汉语提示完成单词(本大题共30小题，每小题1分，共30分) 1. The charity focuses on raising drug abuse a________ (意识) 2. After failing three times, he finally t________ in the towel (认输) 3. The old system needs to be u________ (更新) to the latest version. 4. She couldn’t t________ (忍受) the noise any longer. 5. The meeting l________ (持续) for over four hours. 6. He’s c________ (不断地) checking his phone during class. 7. The room had been o________ (占用) when we arrived. 8. The team m________ (设法完成) to finish the project on time. 9. Stop p________ (沾染) up bad habits from your friends. 10. The app helps users m________ (管理) their budgets wisely. 11. The fifth floor is for the s________ (社交) media department. 12. She’s tired o________ (精疲力尽) after working 12 hours straight. 13. The program teaches kids to r________ (依靠) on themselves. 14. We need e________ (设备) for the science experiment. 15. The news spread quickly through s________ (社交) media. 16. He’s c________ (不停地) interrupting the speaker. 17. The report h________ (碰巧) to be on my desk. 18. The store accepts various payment a________ (账户). 19. The project r________ (需要) careful planning. 20. She’s learning to be in c________ (控制) of her emotions. 21. The campaign aims to e________ (鼓励) healthy eating. 22. The software needs to be t________ (打开) on manually. 23. They’re making g________ (好的) use of solar energy. 24. The study focuses on y________ (年轻) generations. 25. The book teaches l________ (终身) values. 26. The program e________ (装备) students with skills. 27. The event r________ (代表) a new beginning. 28. She believes in k________ (善意) to strangers. 29. The course o________ (客观地) analyzes the data. 30. The system i________ (涉及) complex calculations. 【答案】 1.awareness 2.threw 3.updated 4. tolerate 5.lasted 6.constantly7.occupied 8.managed 9.picking 10.manage 11. social 12. out 13. rely 14.equipment 15.social 16. constantly 17. happened 18. accounts 19.requires 20. control 21. encourage 22. turned 23. good 24. younger 25.lifelong 26. equipped 27.represents 28.kindness 29. objectively 30. involves 三、完成句子(本大题共15小题，每小题2分，共30分) 1. 这位年轻的主持人被提升为电视台的台长了。 The young moderator ________________ the head of a television station. 2. 经过三个月的康复治疗，他终于戒除了毒瘾。 After three months of treatment, he finally ________________ drug addiction. 3. 学生们正在充分利用图书馆资源完成研究项目。 The students are ________________ the library resources for their research project. 4. 请查看我们网站上的最新公告。 Please ________________ the latest announcements on our website. 5. 尽管遇到困难，他们从未放弃筹款活动。 Despite difficulties, they never threw in the towel on the ________________. 6. 现代年轻人更倾向于使用电子支付。 The ________________ prefer to use digital payment methods. 7. 这个应用程序帮助你明智地管理零花钱。 This app helps you ________________ wisely. 8. 经过反思，我意识到自己犯了严重的错误。 ________________, I realized I had made a serious mistake. 9. 志愿者们在灾区发放生活必需品。 Volunteers are ________________ in the disaster area. 10. 这项技术让远程工作变得更加容易。 This technology has ________________. 11. 她不断刷新页面查看最新消息。 She kept refreshing the page to ________________ the latest news. 12. 总共有一百多人参加了这次慈善跑。 ________________ over 100 people participated in the charity run. 13. 贫困家庭经常面临食物短缺的问题。 Poor families are often ________________ food shortages. 14. 这些课程教会孩子们重要的生活价值观。 These courses taught children important ________________. 15. 他每月存钱是为了将来的创业计划。 He’s ________________ every month for his future business plan. 【答案】 1. was promoted to 2. detoxed from 3. making full use of 4. check out 5. fundraising activity 6. younger generations 7. manage your pocket money 8. On reflection 9. distributing necessities 10. made working remotely easier 11. catch up on 12. A total of 13. faced with 14. lifelong values 15. putting aside money ( 1 / 9 学科网（北京）股份有限公司 ) 学科网（北京）股份有限公司 $$