2018-2019学年高中英语课时分层作业7 Unit 9 Wheels 北师大版必修3

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高中英语Unit 9 Wheels知识点剖析(2) 3

号顿市安谧阳光实验学校Unit 9 Wheels 知识点剖析（2）句子·剖析·拓展Wherever someone finished a journey,they would leave the bike there for someone else to use.不论在哪里结束行程，人们都会把自行车留在那儿供别的需要者使用。

【剖析】这是一个带有状语从句的复合句。

wherever引导时间状语，表示“无论在哪里”。

wherever的功能相当于where ，只是含义上稍有差异。

又如：Wherever you are,don’t forget to give me a call.不论你在哪儿，别忘了给我打电话。

He always take his notebook wherever he goes.他去哪儿都带着笔记本。

【拓展】 wherever还可以变形为no matter where。

例如上面两个例子还可以变为：No matter where you are,don’t forget to give me a call.He always takes his notebook no matter where he goes.这一类的词还有whatever,whoever,whenever,however等。

这些词的词性分别就是去掉ever之后的词的词性，也就是说，whatever和whoever还是代词，而wherever,whenever 和however还是副词。

其中，作代词的whatever和whoever可以在句中充当主语和宾语，还可以引导状语从句，而wherever，whenever和however 就只能引导状语从句了。

表示“第一个到达的人会得到金鸟”，以下三种说法都对。

Whoever arrives first will get the gold bird.Whoever arrives first,he will get the gold bird.No matter who arrives first,he will get the gold bird.但是wherever，whenever 和however不能用于第一种结构。

20182019学年高中英语课时分层作业8Unit9Wheels北师大版必修3

宝宝宝宝嘻嘻嘻课时分层作业 ( 八)[ 语言知识练习固基础]Ⅰ. 单句语法填空1．He had a good impression(impress) of the new style of the car.2．The Zhaozhou Bridge is an old bridge made(make) of stone.3．I wrote him a letter to show my appreciation(appreciate)of his thoughtfulness. 4．He is my only reliable(rely) friend whenever I was in trouble.5．So far ， the criminals have been discovered(discover) by the police.6．Are you likely(like) to be out late tonight?7．Children should not be encouraged to rely on the electronic dictionaries as itwill make them lazier.8．Passengers should check in for Flight BA125 to Berlin.9．The train for Beijing will pull out in 10 minutes on schedule.10．Strangely ，some people find that they can smell one type of flower but not another ， whereas others are sensitive to the smells of both flowers.Ⅱ. 达成句子1．他有可能博得此次竞赛，由于他很勤劳。

高三英语一轮复习 Unit 9 Wheels课时作业北师大版必修3

课时作业(九) [模块3 Unit 9 Wheels](限时：40分钟)Ⅰ.阅读理解AHave you ever wondered?1. Why do airplanes take longer to fly west than east?It can take five hours to go westeast from New York (NY) to London but seven hours to travel eastw est from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射)stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the westeast direction when they are moving with the wind than in the opposite direction.2. What would happen if the gravity on the earth was suddenly turned off? Supposing we could magically turn off gravity. Would buildings and other structures(建筑物)float away? What happened would depend on how strongly the things were attached to the earth. The earth is moving at quite a speed, moving at over a thousand miles per hour. If you turn something around your head on a string(细绳), it goes around in a circle until you let go of the string. Then it flies off in a straight line. Switching off gravity would be like letting go of the string. Things not attached to the earth would fly off in a straight line. People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things outside would fly off into space.1.What information can we get from the first passage?A．It is the jet stream that affects how fast airplanes fly.B．Planes go slower when they are moving with the wind.C．It takes more time to fly from NY to London than from London to NY.D．The jet stream always blows from the east to the west across the Atlantic. 2．The underlined word “shoot” in the 2nd passage probably means “________”．A．send for B．move quicklyC．come out D．grow quickly3．It can be inferred that without gravity ________．A．buildings and other structures would float awayB．trees and buildings would not so easily fly offC．something around your head would not float awayD．everything outside buildings would fly off into space4．Where can we most probably read this text?A．In a research paper. B．In a short story.C．In a travel magazine. D．In a student's book.BI've spent over a year in India，and in those 365 plus days，I've learned a lot about getting around Indian cities.My biggest lessons have been learned through being cheated，particularly by taxi and rickshaw(人力车) drivers，but that doesn't mean those are bad ways to travel，as long as you know what you're doing.Below are thebest ways to get around the city of Delhi，India，and tips for how to keep from being the victim of scams(诈骗)．Taking taxis is a great way to get around the city of Delhi and chances are，if you arrive in Delhi by plane，as soon as you make it through customs，you'll be swarmed by Indian taxi drivers.At the Delhi airport，be sure to arrange for a taxi to your hotel at one of the two Delhi Traffic Police Taxi Booths.One is inside the airport，and one is outside.The key is to make sure to go to a booth run by the police，rather than by independent taxi drivers.Rickshaws are one of my favourite ways to get around Indian cities，in part because it's how the locals often travel.Autorickshaws are more common，but bicycle rickshaws are still used in old Delhi.If you do have a chance to take a bicycle rickshaw，you should do it at least once for a unique experience that should only set you back about 15 rupees.Autorickshaw rates around Del hi range between 30 and 80 rupees，depending on distance.If you really want to travel around Delhi like the locals，take a public bus.Indian buses become very crowded and most do not have air conditioning.They are，however，very cheap.A bus trip won't set you back any more than 15 rupees，as long as you stay within the city limits.Since Indian buses get so crowded，try to board the bus at the start of the route so you can get a seat.The train is a great way to get around within the city of Delhi.Fares are reasonable，between 6 and 22 rupees.All departure announcements are in both Hindi and English，and tokens can be purchased for between 6 and 22 rupees.5．The author is trying to ________ in Delhi through this text.A．give some advice of travellingB．expect us to travel aroundC．show his/her experiencesD．explain the difficulties of travelling6．The author suggests taking a rickshaw in order to ________．A．save some moneyB．enjoy the comfortable tripC．gain some unique experienceD．help the local rickshaw drivers7．What can we infer from the passage?A．You won't have to pay much if you travel around by bus in India.B．It will be difficult for you to get a seat if you get on the bus halfway. C．A rickshaw driver only charges whatever amount you give him.D．You'll have to speak English if you travel around in India.8．Which may be the topic that follows?A．Hotel recommendations in Delhi.B．Weather conditions in Delhi.C．Food and drink in Delhi.D．Car rentals in Delhi.Ⅱ.完形填空There are many different ways of seeing a town for the first time. One of them isto walk around it, a guidebook__9__ hand. Of course, we may __10__ with our guidebooks the history and __11__ developments of a town and get to know them. __12__ then, if we take our time and __13__ in a town for a while, we may get to know it better. When we __14__ it as a whole, we begin to have some __15__ ，which even the best guidebooks do not answer. Why is the town just __16__ this, this shape, this plan, this size? Why do its streets __17__ in this particular way, and not in any __18__ way?Here even the best guidebook __19__ us. One can't find in it the information about how a town has developed to the __20__ appearance. It may not describe the original (最初的) __21__ of a town. However, one may get some idea of what it __22__ look like by walking around the town. One can also imagine __23__ the town was first planned and built. Then one can learn more about in what direction the town __24__ to develop.What is the __25__ of studying towns in this way? For me, it is __26__ that one gets a greater depth of pleasure by visiting and seeing a town with one's own eyes. A __27__ visit to a town may help one better understand why it is attractive __28__ just reading about it in a guidebook.9．A.in B．atC．by D．on10．A.write B．studyC．tell D．remember11．A.strange B．similarC．separate D．special12．A.But B．BeforeC．Since D．Until13．A.march B．workC．stay D．wait14．A.look at B．look afterC．look for D．look up15．A.ideas B．opinionsC．feelings D．questions16．A.of B．forC．like D．as17．A.open B．runC．begin D．move18．A.one B．moreC．other D．such19．A.helps B．tricksC．fails D．satisfies20．A.old B．normalC．first D．present21．A.capital B．meaningC．design D．change22．ed to B．seemed toC．had to D．happened to23．A.what B．howC．when D．where24．A.stops B．appearsC．starts D．continues25．A.point B．viewC．problem D．difficulty26．A.nearly B．simplyC．generally D．hardly27．A.costly B．formalC．group D．personal28．A.from B．thanC．through D．withⅢ.语法填空A: You are lucky to be working in __29__ a big city that everything here is wonderful. B: I don't think so. __30__(actual) I don't have interest in city life.A: Why? City life seems to be very interesting and __31__(comfort)．B: Not really. They can hardly enjoy sunshine because of tall buildings around their houses. They can hardly know __32__ season it is. What's going on in nature seems to have __33__ to do with them.A: That's terrible. Sunshine and fresh air are quite __34__(value). __35__seems that rural life is better. But working in a big city means __36__ more money without hard work like farming, doesn't it?B: Yes, perhaps, but there is another problem. The cost of living in the city is much higher than __37__ in the countryside. Sometimes people can't make ends meet these years.A: So that's how it is! I hadn't thought of that. I __38__(wish) to ask you to help me find a job here. Now I give it up. I'd rather live in my village all my life. 29．________30.________31.________32.________33.________34．________35.________36.________37.________38.________Ⅳ.短文改错Last week, I, together with my friends, visited Mount Yuntai in Henan Province. It is famous as its beautiful and unique scenery. We gathered at the school gate at 7：00 am. Two hours late we arrived by bus. On arriving, we set about climb in groups. At noon, we got together at the Geological Museum to watch some exhibits, where show how geological structures form. Then we had lunch and take a break. At 2：00 pm, we continued my exploration regardless of tiredness. We met at that is called Zhuyu Peak at 4：00 pm. After taking some photos, we walked down the mountain. At 6：00 pm, we returned back to school. It was unforgettable trip. I felt excited by the amazed beauty of nature.课时作业(九)Ⅰ.A本文向我们解释了两个特殊的科普知识：一个是大西洋上空的气流是如何影响飞机的飞行速度的；二是如果没有了地球引力将会出现什么现象。

2018_2019学年高中英语Unit9Wheels单元水平测试含听力北师大版必修3(有答案)

Unit 9 Wheels(时间：120分钟满分：150分)第Ⅰ卷(选择题，共100分)第一部分听力(共两节，满分30分)第一节(共5小题；每小题1.5分，满分7.5分)听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

Text 1W: Do you think we should paint our bedroom yellow or light blue?M: Why not pink?1．What color does the man prefer?A. Light blue.B. Yellow.C. Pink.答案：CText 2M: May I help you?W: The collar on this jacket is too small. Can you make it larger?M: Let me look at it. I can do it for twenty dollars.2．What do we know about the jacket?A. The jacket is too small.B. The collar on the jacket is too small.C. The collar on the jacket is too large.答案：BText 3M: Can I help you, madam?W: Yes, I want to report a theft that happened to my house during our absence. My husband and I went on a holiday last week.M: I see. What is missing?3．Who is the woman speaking to?A. A policeman.B. A friend.C. A shop assistant.答案：AText 4M: It only takes two hours to get to New York, but you'll have a six－hour layover between flights.W: Oh, that's good. I don't mind having the time in New York. I still have a few things to shopfor.4．How many hours will the woman be in New York?A. Two hours.B. Six hours.C. Four hours.答案：BText 5W: What colour do you like better for the wall?M: White of course, which makes the room bright and clean.W: How about painting the wall yellow?M: I think we can paint the sitting room and kitchen if you like.5．What color will the kitchen be painted?A. White.B. Green.C. Yellow.答案：C第二节(共15小题；每小题1.5分，满分22.5分)听下面5段对话或独白。

2019高中英语课时分层作业9 Unit 9 Wheels 北师大版必修3

课时分层作业(九)[语言知识练习固基础]Ⅰ.单句语法填空1．The disease occurs most frequently (frequent)in rural areas.2．Let's compromise and each pays the half damages (damage)．3．Judgment should be based(base)on facts，not on hearsay.4．In conclusion(conclude)，I wish this meeting every success.5．I hope I can find a suitable(suit) job after graduation.6．My uncle is occupied(occupy) in building his own house.7．He needed money to feed his addiction (addicted)to gambling.8．Students receive admission (admit)cards before attending college entrance exam. 9．You may be physically (physics) and mentally exhausted after a long flight. 10．It is not how much we do but how much love we put into what we do that benefits our work most.Ⅱ.完成句子1．不久前的这场暴风雨对农作物造成了很大损失。

The late storm did much damage to the crops．2．你应该以某事实为依据进行判断。

You should base a judgment on the fact．3．直到他读了文件之后，格罗斯先生才意识到他面临的任务很难完成。

2018_2019学年高中英语课时分层作业9Unit9Wheels北师大版必修320181

The late storm did much damage to the crops．2．你应该以某事实为依据进行判断。

You should base a judgment on the fact．3．直到他读了文件之后，格罗斯先生才意识到他面临的任务很难完成。

高中英语Unit9Wheels7Grammar课时作业北师大版必修3

高中英语Unit9Wheels7Grammar课时作业北师大版必修3Ⅰ.单句语法填空1．My brother is an actor. He ________ (appear) in several films so far.解析：句意：我弟弟是个演员，到现在为止，他已经演了好几部电影了。

句中有时间状语 so far，意为“迄今为止；到现在为止”，可确定用现在完成时。

答案：has appeared2．The telephone ________ (ring) four times in the last hour, and each time it was for my roommate.解析：句意：电话在一个小时里响了四次，每次都是找我室友的。

句中有时间状语 in the last hour，用现在完成时表示已经完成的动作。

答案：has rung3．—How is your grandfather?—My grandfather ________ (be) dead for two years.解析：句意：——你爷爷身体怎么样？——我爷爷去世两年了。

for two years 与现在完成时连用。

答案：has been4．The little boy is dirty from head to foot because he ________ (play) in the mud all morning.解析：句意：这个小男孩从头到脚都脏了，因为他在泥里玩了一上午。

整个上午都在玩，表示动作一直持续到说话时，用现在完成进行时。

答案：has been playing5．Now that she is out of work, Lucy ________ (consider) going back to school, but she hasn't decided yet.解析：句意：既然露西失去了工作，她一直在考虑重新回学校，但是还没有做出决定。

2019高中英语课时分层作业7 Unit 9 Wheels 北师大版必修3

课时分层作业(七)[语言知识练习固基础]Ⅰ.单句语法填空1．Whichever team wins on Sunday will go to the National Championships.2．Progress so far has been very good.Therefore，we are sure that the project will be completed on time.3．A fierce fire broke out there last night.Consequently(consequence)，most of the building was burnt to the ground.4．The patient is arguing with the nurse about his illness.5．Thanks to the Party's effective policies and measures，the earthquakehit areas returned to normal life not too long after earthquakes.6．We have been working(work) on it for several hours but we haven't yet reached any conclusion. 7．The Second World War broke out in the 1930's.8．—When could you have a meal with me?—I'd like to go whenever it is convenient to you.9．Tony's parents thought he was at school，but actually(actual) he was in an Internet bar. 10．It was a great convenience(convenient)to have the doctor living near us.Ⅱ.完成句子1．无论什么时候回到这个地方，他都十分快乐，心满意足。

【文库精品】高中英语课时分层作业9 Unit 9 Wheels 北师大版必修3

The late storm did much damage to the crops．2．你应该以某事实为依据进行判断。

You should base a judgment on the fact．3．直到他读了文件之后，格罗斯先生才意识到他面临的任务很难完成。

2018届高考英语一轮温习Unit9Wheels课时增强练北师大版必修3

Well，why not turn envy on its head，and make it the encouragement you need for self improvement？The best weapon against envy is not to compete where you can’t shine，but to do your absolute best where you can.
Start by making peace with yourself，and accept the gifts which make you unique.Make an agreement with yourself to be the best you can be.Then find out exactly the circumstances and qualities in others that start your envy.Is it someone’s singing voice，their work promotion，or their new car？Envy shows us the things we’d like to have，so make a plan to earn what’s important to you.Sign up for a night class.Start a training program.Give up a treat or two，and start saving for what you want.
解析：考查细节明白得。依照Be a Golden Globetrotter！部份中的“Travel to 5 countries in 5 weeks”可知答案。

2019届高考英语一轮复习Unit9Wheels课时练1阅读理解提速练北师大版必修3

Unit 9 Wheels课时练1 阅读理解提速练Ⅰ阅读理解A(2018·山西八校联考)Belgium is the land of music festivals. There are rock, pop, world, electronic music festivals and more, so you’re sure to find a festival that suits your taste.GroezrockGroezrock could be considered the opener of the festival season in Belgium. This festival grew from a small event to an international festival that had 33，000 visitors in 2016. If you’re into the harder stuff(东西), this is where you need to go.When? April 29－30. Where? Meerhout. Music? Punk, emo, ska and rock in all its variations. Free? No.Sfinks MixedSfinks is a world music festival that focuses on bringing culture together. There are also plenty of things to do besides watching the performances. Good to know for famili es: Sfinks is a kidfriendly festival, with workshops, storytelling and performances aimed at children.When? July 27－30. Where? Boechout. Music? World. Free? The festival is free; the camping is not.Graspop Metal MeetingIf Groezrock doesn’t seem rough enough to you, Graspop Metal Meeting might. As the name says, this festival is all about metal, rock and punk. In 2016 the festival received 140，000 visitors who came to watch the more than 100 bands performing.When? June 16－18. Where? Dessel. Music? Metal. Free? No.Genk on StageGenk on Stage is a pop musical with not only a lot of Belgian artists, but also some international names. 80，000 people attended Genk on Stage in 2016.When? June 23－25. Where? Genk. Music? Pop. Free? Yes.【解题导语】本文是一篇应用文，涉及音乐节话题。

高中英语 Unit 9 Wheels 课时跟踪练(一)WarmupLesson

感顿市安乐阳光实验学校课时跟踪练(一) Warm-up & Lesson 1— Pre-readingⅠ.阅读理解AZipped (用拉链拉上或扣上) into a bag, it looks like a large umbrella.Unfolded, it goes along the street like any other bicycle.It's the “Abike”， the brainchild (脑力劳动的产物) of British inventor Sir Clive Sinclair, who made history in the 1970s by developing the world's first pocket calculator.He described his new invention as “the world's smallest, lightest foldable bicycle”．“My original thought was that if you could have a bicycle that was dramatically lighter and more firm than the ones that exist today, it would change the way in which bicycles are used，” said Sinclair.The minibike, showed in Singapore last week and set to go on sale worldwide at a price of nearly $300, is built for riders as heavy as 112 kilograms and is heightadjustable (可调整高度的). It takes about 20 seconds to fold or unfold.Its wheels are a quarter the size of those on a regular bicycle, but Sinclair promises a smooth ride for most cyclists.“You require no extra energy to ride the ‘Abike’ and it can go up to 15 miles per hour (24 kilometres per hour)，” he said. Constructed mainly of plastic, the 5.5kilogram bicycle folds into a package of less than 0.03 cubic metres.Sinclair also invented the first pocket TV in 1984 and the futuristic C5 electric tricycle in 1985. He said he hoped the bicycle would attract common citizens, officials, campers or anyone needing transport for a short trip and he said the next step for the “Abike” was to add an electric motor in a few years.语篇解读：普通的自行车人人都见过，可是你见过折叠以后像伞一样的自行车吗？现在有人发明了这种自行车。

高中英语 Unit 9 Wheels达标测试试题(共26页)

【英语】北师大版达标(dá biāo)测试〔Unit 9 Wheels〕自主我夯基我达标Ⅰ.语法训练1.The price_______ ,but I doubt whether it will remain so.A.went downB.will go downC.has gone downD.was going down1.C 说话时价格已经降了，动作已经完成，而且降价肯定对如今甚至以后造成了影响。

2.—Hi,Tracy,you look tired.—I am tired.I________ the windows all day.A.cleanedB.had cleanedC.have been cleaningD.have cleaned2.C 整整一天都在擦窗子，表示动作一直是持续的。

3.—Would you like to go to Shanghai?—Yes.In the last ten years,great changes________ in Shanghai.A.has taken placeB.have happenedC.have taken placeD.have been taken place3.C “in the last/past+时间是〞是如今完成时的标志性时间是状语。

take place不能用被动语态。

4.The little boy is dirty from head to foot because he________ in the mud all morning.A.has playedB.is playingC.has been playingD.was playing4.C 整个(zhěnggè)早晨都在玩，表示动作一直是持续的。

5.Proper first aid can save a seriously injured person,especially when he is bleeding heavily or _______.A.has poisonedB.has been poisonedC.was poisonedD.is poisoning5.B 已经中毒了。

高一英语Unit9WheelsL3CleanMachines语言点模块3试题

U9 L3 Clean Machines 知识点1. 区别如今完成进展时和如今完成时I have been reading the book. 我一直在读这本书。

I have read the book. 我已经读了这本书。

牢记：如今完成进展时〔have been doing〕表示“一直〞如今完成时〔have done〕表示“已经〞可见：如今完成进展时表示某一个动作从过去开场发生，一直延续到如今，并有可能继续下去。

翻译：我已经完成作业了。

我一直等了你三个小时。

他已经死了。

他们一直在修那条马路。

We have cleaned the classroom.We have been cleaning the classroom.2. interest vt. 使……发生兴趣。

n. 〔不可数〕兴趣〔和in连用〕The story interests me very much.The story is interesting. 令人感兴趣的I am interested in the story. 对……感兴趣I have / show / take an interest in stamp collecting.对……有兴趣/对……表现出兴趣/对……产生兴趣翻译：我对你说的不感兴趣。

男孩对这部有趣的电影感兴趣。

他对看电视表现了极大的兴趣。

3. so far 到目前为止〔常和如今完成时连用〕We haven’t heard from him so far.翻译：到目前为止，他只完成了一半作业。

到日前为止，这道数学題还没算出来。

4. persuade vt. 说服; 使相信I persuaded him to go with us. 说服某人做某事He persuaded me of his sincerity(诚意).使某人相信翻译：我将劝他参加我们的俱乐部。

她说服我买下这本书。

5.averageThe average age of the boys in this class is fifteen.He averaged nine hours' work a day.The rainfall there averages 300 mm a year.翻译：将7, 14, 6之和均分得9。

2019高中英语课时分层作业7 Unit 9 Wheels 北师大版必修3

课时分层作业(七)[语言知识练习固基础]Ⅰ.单句语法填空1．Whichever team wins on Sunday will go to the National Championships. 2．Progress so far has been very good.Therefore，we are sure that the project will be completed on time.3．A fierce fire broke out there last night.Consequently(consequence)，most of the building was burnt to the ground.4．The patient is arguing with the nurse about his illness.5．Thanks to the Party's effective policies and measures，the earthquakehit areas returned to normal life not too long after earthquakes.6．We have been working(work) on it for several hours but we haven't yet reached any conclusion.7．The Second World War broke out in the 1930's.8．—When could you have a meal with me?—I'd like to go whenever it is convenient to you.9．Tony's parents thought he was at school，but actually(actual) he was in an Internet bar.10．It was a great convenience(convenient)to have the doctor living near us. Ⅱ.完成句子1．无论什么时候回到这个地方，他都十分快乐，心满意足。

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课时分层作业(七)[语言知识练习固基础]单句语法填空1．If they had informed(inform) us, we would not come here now.2．We had the machine repaired(repair)．3．Vegetable oil is digestible(digest) and mineral oil is not.4．He swapped his old car for a new motorcycle.5．They need to be tolerant(tolerate) of different points of view.6．Something suspicious was found after the room was sought through．7．He's very vain of/about his abilities.8．She seems very much opposed to your going(go) abroad.9．The enemy planes dropped bombs at random.10．Your attitude is in contradiction to your character.[高考题型练习提能力]Ⅰ.阅读理解Instead of reaching for the fake tan or heading for the sun, new research suggests the best way to obtain a healthy glow is to eat more fruit and vegetables.“Most people think the best way to improve skin color is to get a suntan, but our research shows that eating lots of fruit and vegetables is actually more effective，”said Dr.Ian Stephen at the School of Psychology, University of Nottingham.The team of researchers found that people who eat more portions of fruit and vegetables per day have a more golden skin color, due to compounds called carotenoids(类胡萝卜素)．Carotenoids are antioxidants (抗氧化剂) that help absorb damaging compounds produced by the stresses and strains of everyday living, especially when the body is fighting disease. They are also responsible for the red coloring in fruit and vegetables such as carrots and tomatoes，and are important for our immune and reproductive systems.“We found that，given the choice between skin color caused by suntan and skin color caused by carotenoids, people preferred the carotenoid skin color，”said Dr. Stephen.“The study findings are important as they suggest that evolution favours people who choose to form alliances with healthier individuals over unhealthy individuals，”Dr.Stephen explained.Professor David Perrett said，“This is something we share with many other species. For example, the bright yellow beaks and feathers of many birds can be thought of as signs showing how healthy a male bird is. Besides，females of these species prefer to mate with brighter，more colored males. But this is the first study in which this has been demonstrated in humans.”【语篇解读】人们通常认为，晒晒太阳有利于改善人的肤色。

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