北大秋英语作业答案

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北大14秋季《大学英语1》作业2答案

北大14秋季《大学英语1》作业2答案

作业二作业ID: 95383--------------------------------------------------------------------------------1.鼓励独立完成作业,严惩抄袭。

- This box is too heavy for me to carry it upstairs.- ______B___A. A. You may ask for help.B. B. I'll give you a hand.C. C. Please do me a favor.D. D. I'd come to help.2.--How is Mr Brown?-- _____C_________.A. A. He is tall and beautifulB. B. He is very strict with usC. C. He is fineD. D. He is in an expensive car3.- How was your trip to London, Jane? - ______A_____A. A. Oh, wonderful indeed.B. B. I went there alone.C. C. The guide showed me the way.D. D. By plane and by bus.4.- Where is Miss Smith?- ____B_____A. A. She's from England.B. B. She's at home.C. C. She's not back.D. D. She's very well.5.-- Please help yourself to the seafood.-- _____D___A. A. No, I can't.B. B. Sorry, I can't help.C. C. Well, seafood don't suit.D. D. Thanks, but I don't like seafood.6.-- We are going to have a singing party tonight. Would you like to join us? -- ______A__A. A. I'm afraid not, because I have to go to an important meeting.B. B. Of course not. I have no idea.C. C. No, I can't.D. D. That's all set.7.- Excuse me, could you show me the way to the nearest post office?- _____D_____ Oh yes! Two blocks away from here at the Green Avenue. You can’t miss it.A. A. I beg your pardon?B. B. What do you mean?C. C. You're welcome.D. D. Mm, let me think.8.- Could you help me with my physics, please?- _____D__.A. A. No, no way.B. B. No, I couldn't.C. C. No, I can't.D. D. Sorry I can't. I have to go to a meeting right now.9.--Hello, may I talk to the director now?--______A____A. A. Sorry, he is busy at the moment.B. B. No, you can't.C. C. Sorry, you can't.D. D. I don't know.10.-______A___.-Thank you.A. A. CongratulationsB. B. CongratulationC. C. CongratulateD. D. To congratulate11.-- Is this your shoe?-- Yes, but where is ____A____?A. A. the other oneB. B. other oneC. C. another oneD. D. the others12.About 40,000 years ago, the sea was ___B____ 40 meters below today’s level.A. A. about onlyB. B. only aboutC. C. about muchD. D. much about13.- It’s a good idea. But who’s going to____A_____ the plan?- I think John and Peter will.A. A. carry outB. B. get throughC. C. take inD. D. set aside14.I have been looking forward to __D__ from my parents.A. A. hearB. B. being heardC. C. be heardD. D. hearing15.Tom, what did you do with my documents? I have never seen such a ___B__ and disorder!A. A. massB. B. messC. C. guessD. D. bus16.The young man was drunk __B______ two glasses of wine.A. A. onB. B. withC. C. atD. D. against17.If you observe more closely, Margaret is ___A_____ of the two girls.A. A. the tallerB. B. tallerC. C. the tallestD. D. tallest18.Mike is better than Peter ___B_____ swimming.A. A. forB. B. atC. C. onD. D. in19.The ___A____ is just around the corner and you won’t miss it.A. A. bicycle's shopB. B. bicycle shopC. C. bicycles shopD. D. bicycles' shop20.Tom was watching TV when someone____C___.A. A. comesB. B. comeC. C. cameD. D. has come--------------------------------------------------------------------------------21.请阅读以下文章,回答文章后的五个小题。

2021年北师大版四年级英语秋季学期阅读与理解专项课后练习

2021年北师大版四年级英语秋季学期阅读与理解专项课后练习

2021年北师大版四年级英语秋季学期阅读与理解专项课后练习班级:_____________ 姓名:_____________1. 阅读大观园。

读短文,判断正(T)误(F)。

Today is Saturday. Jenny, Betty and Danny are at home (在家). In the morning, Jenny does her homework. Betty reads a book. Danny writes a story. In the afternoon, Betty washes her clothes. Jenny draws a picture. Danny sings a song. They are very happy! [1]Today is Saturday. (____)[2]Jenny is at school today. (____)[3]Betty reads a book in the afternoon. (____)[4]Danny writes a story in the morning. (____)[5]They are sad. (____)2.阅读短文,根据图画的内容、中文提示和单词的首字母填入短文所缺的单词。

(1)My r (红色的) shoes are in the l (图书室).(2)My yellow j (夹克衫) is in the c (餐厅).(3)My b (蓝色的) bag is in the c (电脑) room.(4)My g (绿色的) s (毛衣) is in the g (体育室).(5)My brown T-shirt is in the p (操场).3. 阅读理解。

The White family is at home. Mrs. White is in the kitchen. She is cooking. Mr. White is sitting in a chair and reading the newspaper. Tom and his friend Dick are cleaning the bicycle. Jane and her friend Mary are in Jane''s bedroom. They are listening to a tape.( )(1)The White family is in the house.( )(2)Mrs. White is watching TV.( )(3)Mr. White is cooking.( )(4)Tom is cleaning the bicycle with his father.( )(5)Jane and Mary are friends.( )(6)This is Jane''s home.4. Zip餐厅开张啦!Zoom和他的朋友们来用餐,请认真阅读并完成账单。

北大14秋季《大学英语1》作业1 答案

北大14秋季《大学英语1》作业1 答案

作业一1.鼓励独立完成作业,严惩抄袭。

--Can you go to the concert with us this evening?--_____BA. A. No, I already have plans.B. B. I'd love to, but I'm busy tonight.C. C. No, I really don't like being with you.D. D. I'm ill, so I shouldn't go out.2.- Madam, do all the buses go downtown?- ______D___A. A. Wow, you got the idea.B. B. No, never mind.C. C. Pretty well, I guess.D. D. Sorry, I'm new here.3.--Would you mind changing seats with me?--_____CA. A. Yes, you can.B. B. Of course, I like to.C. C. No, I don't mind.D. D. Certainly, please do.4.- Who’s speaking?- This is Tom .CA. A. speaksB. B. spokenC. C. speakingD. D. saying5.-- Congratulations! You won the first prize in today’s speech contest. -- _____C___A. A. Yes, I beat the others.B. B. No, no, I didn't do it well.C. C. Thank you.D. D. It's a pleasure.6.-- Good morning, sir. May I help you?-- ____C___.A. A. Yes, I don't buy anything.B. B. No, I don't need your help.C. C. Yes, I need some sugar.D. D. Oh, no. That's OK.7.- That’s a beautiful dress you have on!- ______A____A. A. Oh, thanks. I got it yesterday.B. B. Sorry, it's too cheap.C. C. Hey you can have it.D. D. See you later.8.-- Hello, I’m Harry Potter.-- Hello, my name is Charles Green, but___C_____.A. A. call my CharlesB. B. call me at CharlesC. C. call me CharlesD. D. call Charles me9.- Oh, sorry to bother you.-___A_____.A. A. That's okayB. B. No, you can'tC. C. That's goodD. D. Oh, I don't know10.- Thank you for inviting me.- ____C___A. A. I really had a happy time.B. B. Oh, it's too late.C. C. Thank you for coming.D. D. Oh, so slowly?11.If you ____D____your work, you can go there first.A. A. will finishB. B. finishedC. C. finishingD. D. have finished12.--Nice to see you. I ___A_____you for a long time.A. A. haven't seenB. B. didn't seeC. C. hadn't seenD. D. don't see13.The red flower goes from one to ___C__ in the class.A. A. the otherB. B. othersC. C. anotherD. D. other14.The computer system ___A______suddenly while he was searching for information on the Internet.A. A. broke downB. B. broke outC. C. broke upD. D. broke in15.His salary as a driver is much higher than ____D____.A. A. a porterB. B. is a porterC. C. as a porterD. D. that of a porter16.No matter _____D___, the little sisters managed to round the sheep up and drive them back home safely.A. A. it was snowing hardB. B. hard it was snowingC. C. how it was snowing hardD. D. how hard it was snowing17.The Japanese, _D_____ average, live much longer than the Europeans.A. A. withB. B. inC. C. toD. D. on18.Why not ___B___and do some outdoor activities?A. A. goes outB. B. go outC. C. to go outD. D. going out19.He has been ___A___ for nearly three weeks after the death of his dear pet.A. A. sadB. B. satisfiedC. C. evilD. D. joyful20.I’ll give you a ring if Mike ____A____ tomorrow.A. A. comesB. B. will comeC. C. cameD. D. is coming21.请阅读以下文章,回答文章后的五个小题。

北京大学15秋《大学英语1》作业4答案

北京大学15秋《大学英语1》作业4答案

北京大学15秋《大学英语1》作业4答案1.鼓励独立完成作业,严惩抄袭。

- How do you like this dress?- _________A. A. I am fine, thank you.B. B. It's very pretty.C. C. I bought this dress at a sale.D. D. It's my sister's.————B2.- What can I do for you, madam?- ______________A. A. Thank you.B. B. You can't help me.C. C. I want to buy a camera.大学英语4答案D. D. I'm glad to hear that.————C3.What day is today?-- _________A. A. It's MarchB. B. It's a fine day today.C. C. It's March.D. D. It's Monday.————D4.What do you think of this novel?-- _________A. A. I've read it.B. B. It's well-written.C. C. It was written by my uncle.D. D. I bought it yesterday.————B5.- Would you like to have some coffee?- _________A. A. No, please.B. B. Yes, I like.C. C. It is a pleasure.D. D. No, thank you.————D6.- Wow! This is a marvelous room! I’ve never known you’re so artistic.- ______A. A. Great, I am very art-conscious.B. B. Don't mention it.C. C. Thanks for your compliments.D. D. It's fine.————C7.- Is it possible for you to work late tonight? - _______A.A. I like it.B.B. I'll do that.C.C. I'd love to.D.D. I think so.————D8.How tall is your sister?-- _________A.A. She is not very well.B.B. She is 28 years old.C.C. She is very nice.D.D. She is as tall as I am.————D9.- Oh, sorry to bother you. -________.A.A. That's okayB.B. No, you can'tC.C. That's goodD.D. Oh, I don't know————A10.How much is this necklace?-- _________A. It's very nice.B.B. It's a birthday present from my parents.C.C. It costs fifty pounds.D.D. It's a bargain.————C11.That man looks familiar to me. He reminds _______ Dr. Richards.A.A. me toB.B. meC.C. me forD.D. me of————D12.Every means _______ been tried to solve the difficult problem.A.A. haveB.B. hasC.C. isD.D. are————A13.Australia is one of the few countries ____ people drive on the left of the road.A.A. whichB.B. thatC. whereD.D. on which————C14.When Laura finally arrived she apologized _______ so late.A.A. for to comeB.B. that she was comingC.C. for comingD.D. to come————C15.____ you know, David has been well lately.A.A. WhichB.B. AsC.C. WhatD.D. When————B16.Each new way of looking at a situation ________ our understanding and makes it easier to discover new possibilities.A.A. deepsB.B. deepensC.C. deepD.D. deeply————B17.Samuel Clemens, ________ as Mark Twain, was one of the most famous American writers.A.A. to knowB.B. to be knownC.C. knownD.D. knowing————C18.Eggs, though rich in nourishments, have ______ of fat.A.A. a large numberB.B. the large numberC.C. a large amountD.D. the large amount————C19.She is not only my classmate ________ also my good friend.A.A. orB.B. butC.C. andD.D. too————B20.I like the teacher _____classes are very interesting and creative.A.A. whichB.B. whoC.C. whoseD.D. what————C-------------------------------------------------------------------------------- 21.请阅读以下文章,回答文章后的五个小题。

北大15秋《大学英语3》作业1答案

北大15秋《大学英语3》作业1答案
B. B. from
C. C. at
D.D.on
正确答案:B
13.Jim was absent from school for the whole week _____ a bad cold.
A. A. because of
B. B. in addition to
C. C. according to
D.D.in front of
正确答案:A
14.Some people like to _____ a small sum of money in case of urgent need.
A. A. deal with
B. B. use up
C. C. set aside
D. D. take off
C. C. to lie
D. D. lying
正确答案:D
8.Today Mrs Smith _____ herself in white like a nurse at the garden party.
A. A. wore
B. B. put
C. C. sent
D.D.dressed
正确答案:D
9.In road rules the red light is a ______ for traffic to stop.
A. A. Therefore
B. B. Otherwise
C. C. However
D.D.Because
正确答案:B
5.For many overseas Chinese,Chinais their real _____, because they were born and grew up there.

北大大学英语网上作业及答案

北大大学英语网上作业及答案

1.--Are you feeling all right today?--Not really.--__________________.A. A. Oh, I seeB. B. It doesn't matterC. C. You'd better be happyD. D. I am sorry to hear that2.- How often do you go dancing?-A. A. I will go dancing tomorrow.B. B. Yesterday.C. C. Every other day.D. D. I've been dancing for a year.3.--Smoking is forbidden in the workshop. Please stop it. --Sorry, I ________________.A. A. am not sureB. B. have no ideaC. C. do knowD. D. did not know4.--What’s happened to my library books?--________________.A. A. I have no ideaB. B. You borrowedC. C. You bought them yesterdayD. D. They are about long life5.--What do you think of the song?--__________________.A. A. It sounds sweetB. B. I like music very muchC. C. I don't know the titleD. D. It was a pleasure6.- Unbelievable! I have failed the driving test again!- _______ This is not the end of the world.A. A. Good luck.B. B. Cheer up.C. C. Go ahead.D. D. No problem.7.- That’s a beautiful dress you have on!- __________A. A. Oh, thanks. I got it yesterday.B. B. Sorry, it's too cheap.C. C. Hey you can have it.D. D. See you later.8.- Hi, welcome back! Have a nice trip?- ____________.A. A. Oh, fantastic! Fresh air, and sunshine every dayB. B. Come on, I've got lots of funC. C. By the way, I don't like SaturdaysD. D. Well, I'll look forward to your phone call9.-- Would you mind changing seats with me?-- ________A. A. Yes, you can.B. B. Of course, I like to.C. C. No, I don't mind.D. D. Certainly, please do.10.-- Shall we sit up here on the grass or down there near the water? -- ________A. A. I'd rather stay here if you don't mind.B. B. Sorry, I don't like neither.C. C. Certainly, why not?D. D. Yes, we like these two places.11.-Have you got _____E-mail address?-Yes,**********************.cn.A. A. theB. B. anC. C. aD. D. /12.James Watt ______ the steam engine.A. A. was inventingB. B. inventedC. C. had inventedD. D. has invented13.I have been looking forward to ____ from my parents.A. A. hearB. B. being heardC. C. be heardD. D. hearing14.Few students failed in the exam at the end of last term, _______?A. A. do theyB. B. didn't theyC. C. don't theyD. D. did they15.After walking hurriedly for half an hour, I wanted to drink _______.A. A. something coldB. B. cold somethingC. C. something with coldD. D. something to be cold16.She had _____to do, so she was free.A. A. somethingB. B. anythingC. C. nothingD. D. everything17.I was talking with my mother on the phone when we were ____ suddenly.A. A. cut downB. B. cut offC. C. cut acrossD. D. cut back18.Tom was watching TV when someone______.A. A. comesB. B. comeC. C. cameD. D. has come19.I won’t be free ________ I finish thi s work.A. A. afterB. B. untilC. C. butD. D. when20.I’ll have a cup of coffee and _____.A. A. two breadsB. B. two piece of breadsC. C. two pieces of breadsD. D. two pieces of bread21.请阅读以下文章,并判断文章后五个题干的正误。

2019-2020学年北师大版高中英语选修九同步作业:Unit 25 Going Global课后

2019-2020学年北师大版高中英语选修九同步作业:Unit 25 Going Global课后

姓名,年级:时间:课后限时作业(四)Period Four Resource Bank:Reading[语言知识练]Ⅰ.单句语法填空1.Shakespeare is well。

known as a great writer for his excellent playbooks。

2.The last one to arrive (arrive) pays the meal.3.Health is indispensable (dispensable) to everyone。

4.A private car gives a much greater degree of comfort and mobility (mobile).5. With a stick in their hands, the runners raced on to the finishing line.6.Students are always interested in finding out how far they can go with a new teacher.7.The cost of renting a house in central Xi'an is higher than that in any other area of the city。

8.With more forests being destroyed, huge quantities of good earth is being washed (wash) away each year。

9.She has set a new record; that is, the sales of her latest book have reached (reach) 50 million。

10.We won't start the work until all the preparations have been made (make).[高考题型练]Ⅱ.阅读理解Jewel’s Online Footwear StoreLeather Dress ShoesPrice:$120。

北大17秋季36081001-大学英语1-第一组答案

北大17秋季36081001-大学英语1-第一组答案

一、英译汉(共35题,每题2分,共70分)鼓励独立完成作业,严惩抄袭。

1. Tom's father has taught English here since he graduated from Peking University.汤姆的爸爸从在北京大学毕业后就在这里教英语了。

试题编号:试题类型:简答题标准答案:***试题难度:一般试题解析:***考生答案:汤姆的爸爸从在北京大学毕业后就在这里教英语了。

考生得分:***是否评分:未评分评价描述:***2. Don’t you know that all the animals are good friends now?你难道不知道现在所有的动物都是好朋友吗?试题编号:试题类型:简答题标准答案:***试题难度:一般试题解析:***考生答案:你难道不知道现在所有的动物都是好朋友吗?考生得分:***是否评分:未评分评价描述:***3. Economists study the way a society uses scarce resources such as land, labor and raw materials.经济学家研究的是社会是如何利用诸如土地,劳动力还有原材料等稀缺资源。

试题编号:试题类型:简答题标准答案:***试题难度:一般试题解析:***考生答案:经济学家研究的是社会是如何利用诸如土地,劳动力还有原材料等稀缺资源。

考生得分:***是否评分:未评分评价描述:***4. He wanted to help all the wounded people no matter which side they were fighting for.。

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北大秋英语作业答案 Document serial number【UU89WT-UU98YT-UU8CB-UUUT-UUT108】作业ID: 39655--------------------------------------------------------------------------------1.鼓励独立完成作业,严禁抄袭。

词汇与结构He didn’t live up to had been expected of him.A. A. thatB. B. whatC. C. whichD. D. all2.The old couple decided to a boy and a girl though they had three of their own.A. A. adaptB. B. bringC. C. receiveD. D. adopt3.The relationship between employers and employees has been studied .A. A. originallyB. B. extremelyC. C. violentlyD. D. intensively4.The car halfway for no reason.A. A. broke offB. B. broke downC. C. broke upD. D. broke out5.The police that he committed a series of crimes in the north of the city.A. A. swelledB. B. submittedC. C. surveyedD. D. suspected6.The manager lost his just because his secretary was ten minutes late.A. A. moodB. B. temperC. C. mindD. D. passion7.We gave out a cheer when the red roof of the cottage came view.A. A. fromB. B. inC. C. beforeD. D. into8.I have kept that portrait I can see it every day, as it always reminds me of my university days in London.A. A. whichB. B. whereC. C. whetherD. D. whenThe room is in a terrible mess; it cleaned.A. A. can’t have beenB. B. mustn’t have beenC. C. shouldn’t have beenD. D. wouldn’t have been10.You see the lightning it happens, but you hear the thunder later.A. A. the instantB. B. for an instantC. C. on the instantD. D. in an instant11.it or not, his discovery has created a stir in scientific circles.A. A. BelieveB. B. To believeC. C. BelievingD. D. Believed12.The medicine is on sale everywhere. You can get it at chemist’s.A. A. otherB. B. someC. C. certainD. D. any13.Your hair wants . You’d better have it done tomorrow.A. A. cutB. B. to cutC. C. cuttingD. D. being cut14.I don’t think it advisable that Tom to the job since he has no experience.A. A. be assignedB. B. will be assignedC. C. is assignedD. D. has been assigned15.The goals he had fought all his life no longer seemed important to him.A. A. after whichB. B. with whichC. C. for whichD. D. at which16.改错请在以下句子划线部分中,挑出错误的选项。

He is such strong a man that he can lift ten stones like this one.A. A. suchB. B. thatC. C. liftD. D. like17.It was until after his death that he was recognized as a great composer.A. A. It was untilB. B. thatC. C. was recognizedD. D. a great composer18.It’s already 5 o’clock now. Don’t you think it’s about time we are going homeA. A. It’sB. B. o’clockC. C. Don’t youD. D. are going19.Despite the wonderful acting and well-developed plot the three-hours’ movie could not hold our attention.A. A. DespiteB. B. well-developedC. C. the three-hours’D. D. hold our attention20.People appreciate to have worked with him because he has a good sense of humor.A. A. to have workedB. B. becauseC. C. a good senseD. D. humor--------------------------------------------------------------------------------21.请阅读以下文章,回答文章后的五个小题。

每个小题只有一个最佳选项。

Imagine a school that expected its students to becomeliterate(有读写能力的) without any formal instruction. Most parents would be alarmed by such an approach, which would leave their children confused and with gaps in their understanding. This however has been the philosophy on character developmentin many of our schools. Why is the development of character seen as somehow different from the other skills that we teachOf course there will always be learning by osmosis(耳濡目染)in any school, but as a teacher and primary school head I havefound that a child’s moral literacy is strengthened when they acquire the building blocks of good character such as consideration, courage and honor: qualities which are commonly known as virtue(美德).I personally find that exploring a virtue over a two-week period provides a simple and effective program that allows for the creative input of both teacher and student and a chance for the virtue to embed(使融入)itself. Once a lesson on a virtue such as honesty has been completed we need to allow time for children to practice this concept just as would be the case with fractions or verbs. Allowing children to role play a situation such as making up excuses to cover a mistake can be enormously interesting, and the drama can be frozen allowing the characters to be questioned about their feelings and motives. (80) I t’s also a safe way for children to experience for themselves how a lie usually goes out of control.Our role as educators is also to look for opportunities to help our students as they attempt to strengthen their characters. When something goes wrong we guide the young person to the virtue that will prevent it from happening again. For instance, when am student thoughtlessly disturbs the calm atmosphere of the library, instead of a response such as, "that was really disrespectful and selfish of you!" we draw out from them the required virtue: "When you’re walking through the library, what virtues do you need to use"Which of the following is the main idea of this passage单选题A. A. Teaching morals and values has been a frequently discussed topic in the past few years.B. B. The author and his staff embed virtues into lessons and school life to encourage character development in children.C. C. Kids throughout the population face the same needs, the same challenges, and the same realities in their lives.D. D. Role plays are an excellent way of getting students to practice their English.We can infer from the first paragraph that ______.单选题A. A. there tends to be disagreement about what character education isB. B. most parents are not satisfied with the teaching methods adopted in schoolsC. C. the approach to character education is generally considered different from the approaches to other skillsD. D. more and more schools are adopting strategies to improve school attendanceThe word "philosophy" in the first paragraph is closest in meaning to _____.单选题A. A. studyB. B. subjectC. C. viewpointD. D. investigationThe author is a_____.单选题A. A. teacherB. B. librarianC. C. reporterD. D. managerWhich of the following is NOT mentioned in the passage as a way to build character in children单选题A. A. Story readings and discussions.B. B. Osmosis.C. C. Taking every opportunity to teach character.D. D. Role play.--------------------------------------------------------------------------------22.It seems like every day there’s some new research about whether our favorite drinks are good for us. One day, science says a glass of red wine a day will help us live longer. The next day, maybe not. It seems journalists are pretty interested in wine research and the same might be said for coffee. Now,there has been a lot of research into whether coffee is goodfor our health.“The results have really been mixed,” admits Neal Freedman who led the coffee study and published his findings in a medical journ al recently. “There’s been some evidence that coffee might increase the risk of certain diseases and there’s also been maybe more recent evidence that coffee may protect against other diseases as well.”Freedman and his colleagues undertook the biggest study yet to look at the relationship between coffee and health. They analyzed data collected from more than 400,000 Americans ages 50 to 71 participating in the study. “We found that the coffee drinkers had a modestly lower risk of death than the non-drinkers,”he said. Here’s what he means by “modestly”:those who drank at least two or three cups a day were about 10 percent or 15 percent less likely to die for any reason during the 13 years of the study. When the researchers looked at specific causes of death, coffee drinking appeared to cut the risk of dying from heart disease, lung disease, injuries, accidents and infections.Now, Freedman stressed that the study doesn’t prove coffee can make people live longer. A study like this can never prove a cause-and-effect relationship. All it can really do is to point researchers in the right direction for further investigation. And even if it turns out that coffee is really good for you, scientists have no idea why.According to the first paragraph, reporters would like to know the research findings of _____.单选题A. A. teaB. B. beerC. C. alcoholD. D. coffeeAccording to the passage, which of the following is TRUE单选题A. A. Freedman and his colleagues hired 400,000 Americans to collect data.B. B. About four hundred thousand Americans worked for Freedman’s team full time for 13 years.C. C. People who took part in Freedman’s research are about 50 to 70 years old.D. D. People who are 50 to 70 years old seldom drink coffee.According to the author, scientists _____.单选题A. A. have already proved that coffee is good for human healthB. B. have a long way to go before they find a way to study coffeeC. C. have avoided the cause-and-effect approach to study coffeeD. D. are still unable to figure out why coffee is good for usThe word “mixed” in the first paragraph means “_____”.单选题A. A. both good and badB. B. put togetherC. C. both sharp and softD. D. confusedWhich of the following is an appropriate title for this passage单选题A. A. Can Beer Help You Live LongerB. B. Can Coffee Help You Live LongerC. C. Can Wine Help You Live LongerD. D. Can Tea Help You Live Longer--------------------------------------------------------------------------------23.阅读文章,根据文意选择最佳选项。

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