电大-人文英语3-翻译-形考题标准答案

—How do you feel about your family life?—.正确答案是：Not bad. I think it is a good choice to be a full-time mother.—Do you have much experience with caring for babies?—.正确答案是：Yes, I do. I often take care of kids in my free time.This movie is ________ that one.正确答案是：as interesting asLily is a good student except ________ she is a little bit careless.正确答案是：thatWe often compare children ______ flowers.正确答案是：toMost couples who get married or decide to live together generally plan to have children. Several years ago, people thought that having big families was common and this was seen as an advantage. That was mainly because children began working at an early age to help provide for the family. But with the changing times and with the cost of living getting higher every single year, having a big family is no longer considered to be a practical option. In fact, more couples consider that they have only one child and some do not have any desire to become parents at all. According to the Australian Institute of Family Studies, by 1986, women aged 40 to 44 years, were considerably more likely to have given birth to two children than three children (36% vs. 27%) or four or more children (19%). However, taken together, women were still more likely to have had three or more children than to have had two children (46% vs. 36%).In recent years, women were more likely to have had two children than three or more children –a trend that was most marked in the most recent period (38% vs. 25% in 1996; 38% vs. 22% in 2006). These days, most families in Australia have two children. But the number of women who had given birth to a single child increased progressively from only 8% in 1981 to 13% in 2006.The U.S. Census Bureau states that there are approximately 14 million only children in America today. This comprises 20% of the children's population compared to only 10% around fifty years ago.1. Several years ago, people thought that having big families wasA. uncommon and this was seen as an advantageB. common and this was seen as a disadvantageC. common and this was seen as an advantage2. By 1986, taken together, women were still more likely to have hadchildren.A. lessC. no3. In recent years, women were more likely to have hadA. three or four childrenB. more childrenC. fewer children4. According to the passage, we can predict that the number of family with a single child will回A. decreased dramaticallyB. increased dramaticallyC. remained steady5. Which of the following may be the best title for the passage?A. Families Having Fewer Children Nowadays.B. Couples Having More Children Nowadays.C. Women Being Likely to Have More Children.形考二—How do you feel about your family life?—.正确答案是：Not bad. I think it is a good choice to be a full-time mother.—It's raining so heavily outside. I'm terribly anxious about my son's safety.—.正确答案是：Don't worry about him. He will come back safe and sound.Lily is a good student except ________ she is a little bit careless.正确答案是：thatWe often compare children ______ flowers.正确答案是：toThe birth rate of the country decreases ______ with years.正确答案是：progressively二、阅读理解：正误判断（每题10分）Stopping Yelling At Your KidsParenting is hard. If you're a parent, I'm sure that I don't need to tell you that our job is a tough one. When you're managing children, it can be difficult to remember that they are still learning. If you find you are yelling at your kids more often than you want to, here are some ways that canhelp you reduce the yelling. I've been working on this for the past few months and I have to say, it's been amazing for both the kids and me.If you are having an argument with your child, you need to make sure you both take the time to really listen. It gives both of you time to think and really listen to each other, which is important.Kids are more likely to listen to you if you listen to them!One of your biggest struggles is to remind yourself of appropriate expectations. You can't expect that your youngest acts as responsibly as your oldest. You should lower what you expect –taking into consideration things like their age –it can make a big difference.You should do your best to take a moment before yelling and take in a deep breath. It makes a world of difference for you. Instead of yelling, you'd better whisper. It can also help diffuse any situation by making things quieter, not louder. Besides, the more time you spend with your kids, the better you'll get at communicating with them. You're both more likely to understand each other.If your children aren't listening or it seems they only don't listen to you, you don't take it personally. You should remind yourself that your kids are still learning and they're not going to be perfect.1. As a parent, you may know that parenting is an easy job.2. Listening to each other is a good way to stop argument between parents and their kids.回答3. Usually younger kids behave less responsibly than elder children.4. Parents should lower their expectations for their kids.5. Both yelling and whispering can help make things quieter.形考三—Our son has picked up some bad habits recently, and I am really worried about it.—.正确答案是：Cheer up. I believe he will overcome it.—It's raining so heavily outside. I'm terribly anxious about my son's safety.—.正确答案是：Don't worry about him. He will come back safe and sound.Young people ______ 62% of University teaching staff.正确答案是：compriseI want to know________ .正确答案是：what his name isThe birth rate of the country decreases ______ with years.正确答案是：progressively二、阅读理解：正误判断（每题10分）Stopping Yelling At Your KidsParenting is hard. If you're a parent, I'm sure that I don't need to tell you that our job is a tough one. When you're managing children, it can be difficult to remember that they are still learning. If you find you are yelling at your kids more often than you want to, here are some ways that can help you reduce the yelling. I've been working on this for the past few months and I have to say, it's been amazing for both the kids and me.If you are having an argument with your child, you need to make sure you both take the time to really listen. It gives both of you time to think and really listen to each other, which is important.Kids are more likely to listen to you if you listen to them!One of your biggest struggles is to remind yourself of appropriate expectations. You can't expect that your youngest acts as responsibly as your oldest. You should lower what you expect –taking into consideration things like their age –it can make a big difference.You should do your best to take a moment before yelling and take in a deep breath. It makes a world of difference for you. Instead of yelling, you'd better whisper. It can also help diffuse any situation by making things quieter, not louder. Besides, the more time you spend with your kids, the better you'll get at communicating with them. You're both more likely to understand each other.If your children aren't listening or it seems they only don't listen to you, you don't take it personally. You should remind yourself that your kids are still learning and they're not going to be perfect.操作提示：句子正确选择下拉选项框为“T”；句子错误选择下拉选项框为“F”。

国开（中央电大）本科《人文英语3》网上形考模拟试题及答案一、交际用语（共计10 分，每小题2 分）1一5 题：选择正确的语句完成下列对话，井将答案序号写在答题纸上。

1. — , doesn't it?- Yes, it does. I like the color and style.A. It is going to rain pretty soonB. You look very beautifulC. The red dress fits me very much2. — Do you have any experience with caring for babies?A. Yes, I do. I have looked after kids for 3 years.B. Not really, as a freshman, I should work hard.C. Yes, they are. They are very cute and smart.3. - Where is John? I couldn't find him.A. He is very busy working on his project.B. I am sorry but I'm afraid I can't agree with you.C. I suppose he could have gone to the meeting room.4. — I find it hard to complete all the assignments while I am working every day.A. The advancement of technology has boosted the pace of our lives.B. You know, good time management is very important in online learning.C. Great. That's a nice way to expand our knowledge nowadays.5. - I have worries that my audience may find my speech boring and fall asleep.The point is …A. Yes, I understand that.B. What's troubling you exactly?C. What do you think of the topic?二、词汇语法（共计30 分，每小题2 分）6一·20 题：阅读下面的句子，从A、B、C 三个选项中选出一个能填入空白处的最佳选项，井将答案序号写在答题纸上。

国开（中央电大）本科《人文英语 3》网上形考试题及答案说明：课程代码： 04015；适用专业：行政管理、工商管理、会计学、金融学、计算机、法学、汉语言文学、护理、社会工作、小学教育、学前教育和园艺；考试平台： http: //www. ouchn. cn。

单元自测 1 形考任务试题及答案题目：—Do you have much experience with caring for babies? —________.答案： Yes, I do. I often take care of kids in my free time. 题目： Lily is a good student except ________ she is a little bit careless.答案： that题目：—How do you feel about your family life?—________.答案： Not bad. I think it is a good choice to be a full-time mother.题目：—It' s raining so heavily outside. I' m terribly anxious about my son' s safety.—________.答案： Don' t worry about him. He will come back safe and sound. 题目：—Ken did badly in his math test. I' m terribly worriedabout the result.—________.答案： Come on. It isn' t the end of the world.题目：—Our son has picked up some bad habits recently, and I am really worried about it.—________.答案： Cheer up. I believe he will overcome it.题目： He asked me ___________ Zhang Hua came to school or not. 答案： whether题目： I want to know________ .答案： what his name is题目： It is said that ______ 2000 factories were closed down during the economic crisis.答案： approximately题目： The birth rate of the country decreases ______ with years.答案： progressively题目： This movie is ________ that one.答案： as interesting as题目： Tom won the first prize of oral English contest, which is beyond his ______.答案： expectation题目： We consider it necessary ______ Tom should improve his behavior.答案： that题目： We often compare children ______ flowers.答案： to题目： Young people ______ 62% of University teaching staff. 答案： comprise二、阅读理解：选择题（每题 10 分）Most couples who get married or decide to live together generally plan to have children. Severalyears ago, people thought that having big families was common and this was seen as an advantage.That was mainly because children began working at an early age to help provide for the family.But with the changing times and with the cost of living getting higher every single year, havinga big family is no longer considered to be a practical option. In fact, more couples considerthat they have only one child and some do not have any desire to become parents at all.According to the Australian Institute of Family Studies, by 1986, women aged 40 to 44 years,were considerably more likely to have given birth to two children than three children (36%vs. 27%) or four or more children (19%) . However, taken together, women were still more likelyto have had three or more children than to have had two children (46% vs. 36%) .In recent years, women were more likely to have had two children than three or more children– a trend that was most marked in the most recent period (38% vs. 25% in 1996; 38% vs. 22%in 2006) . These days, most families in Australia have two children. But the number of womenwho had GIVEN BIRTH TO a single child INCREASED PROGRESSIVELY from only 8% in 1981 to 13% in2006.The U. S. Census Bureau states that there are approximately 14 million only children in Americatoday. This COMPRISES 20% OF the children' s population COMPARED TO only 10% around fifty yearsago.操作提示：通过题干后的下拉框选择题目的正确答案。

开始时间2018年05月20日星期一15:01题目1题干– Looking after a baby is not an easy job, is it?–______________________选择一项:A. Looking after a baby is very tired、B. No, it isn’t、C. I like looking after a baby、正确答案就是:No, it isn’t、题目2题干– How long have you been graduated from your college?–______________________选择一项:A. I’ve been graduated for five years、B. I graduated from my college last year、C. Yes, I’ve been graduated there、正确答案就是:I’ve been graduated for five years、题目3题干– Do you have any experience with caring for babies?–______________________选择一项:A. No, you are freshmen、You should work hard、B. Yes, they are、They are very cute and smart、C. Yes, I do、I have looked after kids for 3 years、正确答案就是:Yes, I do、I have looked after kids for 3 years、题目4题干– Could you please help me choose an Mp4 player online?–______________________ My puter doesn’t work for the moment、选择一项:A. I’m afraid I can’t、B. I don’t agree、C. I hope so、正确答案就是:I’m afraid I can’t、题目5题干– What about learning a foreign language in the summer holiday?–______________________选择一项:A. Yes, I agree with you、B. No, I don’t think so、C. It’s a very good idea、正确答案就是:It’s a very good idea、题目6题干– The advancement of technology has boosted the pace of our lives, and requires us to learn something new every day、–______________________ I have chosen the online program at OU、选择一项:A. Now thatB. That is the reason whyC. Because正确答案就是:That is the reason why题目7题干– I often feel lonely when I engage in my online learning、______________________– I join the online course munity、选择一项:A. How do you solve this problem?B. How do you think about it?C. How often do you engage in online learning?正确答案就是:How do you solve this problem?题目8题干– Ok, I’ll fix your puter right now、– Oh, take your time、 ______________________选择一项:A. I can’t stand it、B. I’m in no hurry、C. That’s a great idea、正确答案就是:I’m in no hurry、题目9题干–I’m sorry for breaking the cup、–Oh, __________、I’ve got plenty、选择一项:A. help yourselfB. forget itC. my pleasure正确答案就是:forget it题目10题干– The red dress fits me very much, doesn’t it?–______________________选择一项:A. It is a little tight、B. Yes, it does、C. You look very beautiful、正确答案就是:Yes, it does、题目11题干–Your phone looks good! _________–Yes, it is a Smartphone、选择一项:A. Where did you buy it?B. What’s it?C. Can I have a look?正确答案就是:Can I have a look?题目12题干– Is your grandmother getting well now?–______________________选择一项:A. She gets up early and do exercise every day、B. Yes, she is much better now、Thank you、C. I don’t believe that she feels fortable、正确答案就是:Yes, she is much better now、Thank you、题目13题干– Brand was Jane’s brother!–_____________________ he reminded me so much of Jane! 选择一项:A. No wonderB. No doubtC. Above all正确答案就是:No wonder题目14题干– We’ve worked for a long time, what about stopping to have a rest? – _____________________选择一项:A. You are wonderful、B. That’s a good idea、C. I like it very much、反馈您得回答不正确正确答案就是:That’s a good idea、题目15题干– Where is John? I couldn’t find him、–______________________选择一项:A. He is very busy working on his project、B. I am sorry but I’m afraid I can’t agree with you、C. I suppose he could have gone to the meeting room、正确答案就是:I suppose he could have gone to the meeting room、。

人文英语3一、单选题1.—Our son has picked up some bad habits recently, and I am really worried about it.—.A.Yes, they have some bad habits.B.Cheer up. I believe he will overcome it.C.Well, he likes picking things up when he is out.正确答案: B答案解释:解析：本题考核“表达鼓励”情境下的交际用语。

当第一说话人对孩子有了坏习惯表达担心时，第二说话人应对此作出直接回应，而A谈的是他们有一些坏习惯，C说的是他喜欢捡东西，只有B作出鼓励，所以选B。

2.—It's raining so heavily outside. I'm terribly anxious about my son's safety.—.A.Well. He is a good boy.B.Yes, it is. It will rain tomorrow.C.Don't worry about him. He will come back safe and sound.正确答案: C答案解释:解析：本题考核“表达焦虑”情境下的交际用语。

当第一说话人对孩子的安全表达焦虑时，只有第二说话人的Don't worry about him. He will come back safe and sound（不用担心，他会安全回来的）是对上句话的正确回应，而A说的是他是一个好男孩，B不是对担心的回应，所以选C。

3. Lily is a good student except ________ she is a little bit careless.A. whereB.whichC.that正确答案: C答案解释:译文：莉莉是个好学生，就是有点粗心。

英译汉2018 人文英语3 –翻译形考答案操作提示：通过题干后的下拉框选择题目的正确答案。

1. Parents are too busy to spend time teaching their kids right fromwrong.正确答案是：BA．父母不会太忙，所以有时间教导孩子明辨是非。

B. 父母都太忙，没有时间教导孩子明辨是非。

C. 父母很忙，但是也抽时间教导孩子明辨是非。

2. Attend parenting classes, or join a local support group if you arehaving trouble understanding how to exercise discipline.获得10.00分中的0.00分A．如果在理解如何管教孩子方面有困难，你可以参加父母课程或者当地的支持团体。

B．如果你在理解练习纪律方面有困难，可以参加父母课程学习或者加入当地的帮助团体。

C．如果在理解练习管教孩子方面有困难，参加父母课程学习或者加入当地的帮助团体是有用的。

3. As millions of people have access to the Internet, criminals look forpotential victims online.正确答案是：CA．当成千上万的人们接受网络，犯罪分子就会寻找网上的潜在受害者。

B. 由于成千上网的人们具备了上网条件，犯罪分子就会悄悄地物色受害者。

C. 由于成百上千万的人们具备了上网条件，犯罪分子会在线物色潜在的受害者。

4. Use software that blocks out certain inappropriate websites in caseyou can't keep an eye anytime.正确答案是：BA．利用软件画出不良网站的轮廓，这样你就不用时时关注了。

B. 利用软件阻挡一些不良网站，以免有时你无暇照看。

【整理不易，如果有帮助可以点点文中的广告，谢谢您！】2020年最新电大《人文英语3》形成性考试（题目和答案）1. [单选题]交际用语:-The red dress fits me very much, doesn't it?-A. lt is a little tight.B. You look very beautiful.C. Yes, it does.2. [单选题]交际用语:-Do you have any experience with caring for babies?-have looked after kids for 3 years.A. Yes, I do. I I have looked after kids for 3 years.B. No, you are freshmen. You should work hard.C. Yes, they are. They are very cute and smart.3. [单选题]交际用语: : -- Linda, what's wrong with your grandmother?-A. She is not retired yet.B. She hurt her leg last week.C. She got a new house just recently.opened it.4. [单选题]交际用语: : -- Someone knocked on the door. Without thinking, I I opened it.-A. That was not a very wise decision, miss.B. They were both wearing stockings over their faces.was expecting my husband, and thought it was him.C.C. I I I was expecting my husband, and thought it was him.5. [单选题]交际用语: : -- Try motivating Tony to cooperate by rewarding his good behavior.-A. It's easier said than done, but i will try.B. No, but sometimes he just isn't reasonable.C. Do not always punish him for lttle things like bad moods.6. [单选题]词汇与结构: They some social work at the weekends. (2分)A. doesB. didC.do.8. [单选题]词汇与结构: The gunman stood the theatre and shoot at the audience inside.A. at the front ofB. in front ofC. on front of9. [单选题]词汇与结构: The traffic accident three days ago. (2分)A. happensB. took place .C. was occurred10. [单选题]词汇与结构: The advancement of technology has boosted the pace of our lives, and requires us to learn _____every day just to stay current in the workplace. (2分)A. new somethingB. something newC. everything11. [单选题]词汇与结构: It is an open secret he is not a qualified manager. (2分)A. thatB.itC. what12. [单选题]词汇与结构: Fifty miles difficult for him to cover because he is only 14years old. (2分)A. have beenB.isC.are13. [单选题]词汇与结构: The higher the temperature is, the liquidevaporates (蒸发) . (2分)A. the fasterB. fasterC. the slower14. [单选题]词汇与结构: This movie is that one. (2分)A. as interesting asB. as more interesting asC. too interesting to15. [单选题]词汇与结构:For there is only one thing that people can't you, andthat is your wisdom. (2分)A. take away fromB. take care ofC. take down16. [单选题]词汇与结构: The U.S. Census Bureau states that there are 14 million only children in America today. (2分)A. approvinglyB. appropriatelyC. approximately17. [单选题]词汇与结构: She is General Manager of big company.A. a, anB. the, aC. a, the18. [单选题]词汇与结构: They must try to the boundaries of knowledge. (2分)A. increaseB. extendC. enrich19. [单选题]词汇与结构: I saw him, and afterwards he was caught by the police.A. stoleB. stealC. stolen20. [单选题]词汇与结构: He asked me Zhang Hua came to school or not.A. ifB. whetherC. what21. [理解题]阅读理解:21.1 [单选题] This article mainly talks aboutA. a newly-designed robotB. The founder of a companyC. problems with a new product21.2 [单选题] According to Steven Waelbers, the robot is designed toA. encourage people to do exerciseB. help people keep healthy and fitC. make people enjoy family time21.3[单选题] The robot would stop in front of pets and people thanks to _____. (4分)A. the remote controllerB. the ultrasound sensorC. the big and square yard21.4[单选题] Which of the following steps should be done in the first place? (4分)A. The owner must wheel the robot around the yard by himselfB. The robot learns and stores the length and width of the lawn.C. The robot operates the task it's going to take without supervision.21.5 [单选题] Which of the following about Waelbers is TRUE? (4分)A. He didn't love building robots when he was a young boy.B. His father asked him to make a robot that could play balls.C. He is starting to sell this snow-shoveling robot in early 2017.22. [理解题]阅读理解:22.1 [判断题] The Wichita Falls Police Department is planning sterner measures to combat crime.A.TB. F22.2 [判断题] According to Hughes, one of the biggest ways of crime prevention is through environmental design. (4分)A. TB. F22.3 [判断题] The biggest site that police are approving fully is . (4分)A.TB. F22.4 [判断题] The purpose of is to help locals set up a real community. (4分)A. TB. F22.5 [判断题] If you use the site, you have to pay for it. (4分)A.TB. F23. [问答题]作文,根据要求写作文: Write a passage about an incident you've witnessed. You may follow the ideas given.(1) Describe what happened exactly.(2) Pay attention to who, what, when, where, etc. of the incident.(3) Offer your advice, if any, to people in similar situations. (20分)I saw a car accident last month. It was a dark night and I was walking on the sidewalk when I suddenly heard a sharp, loud noise. I turned my head and found a woman lying on the ground, crying. A few steps away from her, there was a car with its hazard warning lamps on. There were a few people around her and the driver was making a phone call to the traffic police. I heard that the woman was crossing the street when the red light was on. She did so because she thought that there were no cars, so she risked it. I feel sorry for her because this accident could have been avoided if she didn't ignore the red light. It is advisable to be cautious when we cross the street, and we must observe the traffic rules.。

[国开（中央电⼤）本科《⼈⽂英语3》⽹上形考试题及答案]电⼤⼈⽂英语[国开（中央电⼤）本科《⼈⽂英语3》⽹上形考试题及答案]电⼤⼈⽂英语⼀、交际⽤语（共计 10 分，每⼩题 2 分）1⼀5 题：选择正确的语句完成下列对话，井将答案序号写在答题纸上。

1. — , doesn't it?- Yes, it does. I like the color and style.A. It is going to rain pretty soonB. You look very beautifulC. The red dress fits me very much2. — Do you have any experience with caring for babies?A. Yes, I do. I have looked after kids for 3 years.B. Not really, as a freshman, I should work hard.C. Yes, they are. They are very cute and smart.3. - Where is John? I couldn't find him.A. He is very busy working on his project.B. I am sorry but I'm afraid I can't agree with you.C. I suppose he could have gone to the meeting room.4. — I find it hard to plete all the assignments while I am working every day.A. The advancement of technology has boosted the pace of our lives.B. You know, good time management is very important in online learning.C. Great. That's a nice way to expand our knowledge nowadays.5. - I have worries that my audience may find my speech boring and fall asleep.The point is …A. Yes, I understand that.B. What's troubling you exactly?C. What do you think of the topic?⼆、词汇语法（共计 30 分，每⼩题 2 分）6⼀·20 题：阅读下⾯的，从 A、B、C 三个选项中选出⼀个能填⼊空⽩处的最佳选项，井将答案序号写在答题纸上。

国家开放大学电大《人文英语3》形考网考作业及答案单元自测一一、选择填空，从A、B、C三个选项中选出一个能填入空白处的最佳选项。

（每题10分）题目1—Do you have much experience with caring for babies? ______选择一项：A. Yes, I do. I often take care of kids in my free time.题目2—It's raining so heavily outside. I'm terribly anxious about my son's safety. ______ 选择一项：C. Don't worry about him. He will come back safe and sound.题目3Young people ______ 62% of University teaching staff.选择一项：A. comprise题目4We often compare children ______ flowers.选择一项：B. to题目5We consider it necessary ______ Tom should improve his behavior.选择一项：B. that题目1—How do you feel about your family life? ______选择一项：B. Not bad. I think it is a good choice to be a full-time mother.题目2—Ken did badly in his math test. I'm terribly worried about the result. ______选择一项：C. Come on. It isn't the end of the world.题目3It is said that ______ 2000 factories were closed down during the economic crisis. 选择一项：B. approximatelyHe asked me ___________ Zhang Hua came to school or not.选择一项：B. whether题目5Lily is a good student except ________ she is a little bit careless.一项：C. that题目1—Our son has picked up some bad habits recently, and I am really worried about it. _____选择一项：B. Cheer up. I believe he will overcome it.题目2—Ken did badly in his math test. I'm terribly worried about the result. _____选择一项：C. Come on. It isn't the end of the world.题目3The birth rate of the country decreases ______ with years.选择一项：C. progressively题目4This movie is ________ that one.选择一项：B. as interesting as题目5I want to know________ .选择一项：C. what his name is题目1—How do you feel about your family life?选择一项：B. Not bad. I think it is a good choice to be a full-time mother.题目2—It's raining so heavily outside. I'm terribly anxious about my son's safety.选择一项：C. Don't worry about him. He will come back safe and sound.Tom won the first prize of oral English contest, which is beyond his ______.选择一项：C. expectation题目4This movie is ________ that one.选择一项：B. as interesting as题目5Young people ______ 62% of University teaching staff.选择一项：A. comprise二、阅读理解：选择题（每题10分）Most couples who get married or decide to live together generally plan to have children. Several years ago, people thought that having big families was common and this was seen as an advantage. That was mainly because children began working at an early age to help provide for the family. But with the changing times and with the cost of living getting higher every single year, having a big family is no longer considered to be a practical option. In fact, more couples consider that they have only one child and some do not have any desire to become parents at all.According to the Australian Institute of Family Studies, by 1986, women aged 40 to 44 years, were considerably more likely to have given birth to two children than three children (36% vs. 27%) or four or more children (19%). However, taken together, women were still more likely to have had three or more children than to have had two children (46% vs. 36%).In recent years, women were more likely to have had two children than three or more children –a trend that was most marked in the most recent period (38% vs. 25% in 1996; 38% vs. 22% in 2006). These days, most families in Australia have two children. But the number of women who had given birth to a single child increased progressively from only 8% in 1981 to 13% in 2006.The U.S. Census Bureau states that there are approximately 14 million only children in America today. This comprises 20% of the children's population compared to only 10% around fifty years ago.操作提示：通过题干后的下拉框选择题目的正确答案。