高考英语一轮复习课时提能练16Module4SandstormsinAsia外研版必修3

课时训练16 Module 4 Sandstorms in Asia一、单元扣点Ⅰ.根据句意，用所给单词或短语的适当形式填空forecast chemical desertification cycle frighten major答案 frightening2． is one of the causes of sandstorms.答案 Desertification3．Another big sandstorm in today's weather report.答案 has been forecast4． in a real sandstorm is quite dangerous.答案 To cycle5．Nowadays people use too many in their life, which is bad for the environment.答案 chemicals6．The doctor me to have an X-ray test, and then, he could make a conclusion.答案 urged7．Hundreds of thousands of people died in the earthquake in Tangshanin 1976.答案 major8．My brother is an traveler while I seldom travel.答案 experienced9．We must take measures to our rivers from being polluted.答案 protect10．What a great you have given me!答案 scareⅡ.完成句子1．树吸收二氧化碳，释放氧气。

Trees carbon dioxide and oxygen.答案 take in; give out．在老师的保护下，学生们安全过了马路。

高考英语一轮总复习课时作业 16 Module 4Sandstorms inAsia外研版必修3Ⅰ . 单项填空1．— May I help you？You seem to be having some problems.— ________， thanks.I think I can manage.A． All right B． No problemC．It ’s all right D．There’s no way2．(2013 ·南京高三第二次模拟) — Did Susan visit you again________followingyear?— No，it was almost ten years before she came to see me________second time.A． the ； a B． the ； /C． / ；the D． / ；a3．(2012 ·浙江绍兴质检 )A new study indicates that basic steps taken by peopledaily can go a long way in________greenhouse gas emissions.A． cutting down B． taking downC． pulling down D． breaking down4．(2013 ·河北衡水二次调研)Those who are not admitted to university ， ________，may attend some other courses or classes for adult higher education.A． though important B． if possibleC． unless necessary D． if ever5． The top leaders of the two countries are holding talks in a friendly________.A． atmosphere B． stateC． situation D． phenomenon6．(2013 ·河北省教课质量检测)The professor thought that the idea the youngengineer________was worth considering.A． brought up B． made upC． set up D． picked up7． What the public is ____ ____ about is whether medical workers and scientistswill be able to find a cure for the new disease in a short time.A． concerning B． concernC． concerned D． to concern8． The police asked John to________those photographs and try to pick out theman he had seen.A． look around B． look afterC． look up D． look through9．Hearing the news that they were safe and sound，I felt a great weight________my mind.A． put on B． taken offC． picked up D． given out10 ． When you walk in the streets full of melting snow， you can’t help but________your shoes wet.A． to get B． gotC． get D． getting11． Since the matter was extremely________， we dealt with it immediately.A． violent B． formalC． urgent D． active12． If there ’s a lot of work________，I ’m happy to just keep on until it is finished.A． to do B． to be doingC． done D． doi ng13．Somefalse advertisements are taking the countryside womenas their targets ，because they are easy to________.A． take in B． take onC． take over D． take up14．— The moment I saw him， he began to________about the bad weather he had while traveling there.— He must have had a very unpleasant journey there.A． complain B． compensateC． c ompromise D． explain15． He is ready to help others，seldom，________refusing them when they turnto him.A． if never B． if everC． if not D． if anyⅡ . 阅读理解A(2013 ·安徽示范高中二次联考) Are you the type of person who always says“yes”？I’ve come to learn thatit is very important to learn to say“no”．It’s okay.People are still go ing to like you.They may even respect you more because they know you are honest.I ’m not saying to say “no” to someone who really needs your help.I ’m talking about turning down that meeting that you really do not want to attend or thatbirthday party that you don ’t want to be a guest at.Think for a moment how you feel when you say “yes” to something that you really don’t want to do.If you’re like I once was，you can’t sleep at night and you think about it too much.It weighs on your mind.You try to find way s out.Whatever you’re saying to yourself，if you really wanted to go，you wouldn’t have all of these thoughts.So，why not just say “no” from the beginning ？Maybe you feel like if you don’t show up at the meeting (by the way， it is not one you must attend)，your boss isn’t going to like you or your co-workers won’t respect you.Maybe you feel as if yourmom，dad or sisters won’t love you as much if you don’t do everything for themwhat they ask every occasion.If these people are your true friends，family members， or a good boss ， they will like or love you the same no matter what.People treat you the way you teach themto ，and if you’re someone who always says“yes”，then that’s what they’re expecting.You need to do what is right for you.Of course we do have real obligations inlife to fulfill，but we do not have to do everything others want us to do.1． Which of the following statements would the writer agree with?A． We should try to do what our friends ask us to do.B． We should help others in need.C．Always saying“yes”means you are dishonest.D．Always saying“no” means you are brave.2． Generally speaking，we agree to do what we hate to do because we________.A． have a bad habit B． have a kind heartC． have much concern D． have obligations3 ． The writer believes that if you say“no”to your family members，you’ll________.A． have the same relationship with them as beforeB． have a loose relationship with themC． disappoint themD． upset them4． What would be the best title for the text?A． Learn to Make a Right ChoiceB． To Be YourselfC． Do What You Want to DoD．Learn to Say“No”B(2013 ·福建质量检测) In the 1950s， a family who owned a farm near Beulah ， Michigan kept a bull chained to an elm (榆树)．The bull paced around the tree，dragging the heavy iron chain，which led to a groove (槽) in the bark.The groove deepened over the years，though for whatever reason，it did not kill the tree.After some years，the family took their bull away.They cut the chain，leaving the loop (圈) around the tree and one link hanging down.Then one year ，agricultural disaster struck Michigan in the form of Dutch ElmDisease.All of the elms lining the road leading to the farm became infected anddied.Everyone thought that the old elm would be next.The farm ’s owners considered doing the safe thing ： pulling it out and cuttingit up into firewood before it died.But they simply could not bring themselves todo it.It was as if the old tree had become a family friend.So they decided to let_nature_take_its_course.Amazingly ， the tree did not die.Nobody could understand why it was the only elm that was still standing in the country!Plant pathologists(病理学家) from Michigan State University came out to observe the tree.They observed the scar left by the iron chain ， now almost completely covered by bark.The plant experts decided that it was the chain that saved the elm’s life.They reasoned that the tree must have absorbed so much iron from the chain that it became immune (免疫) to the fungus (真菌)．It ’s said that what doesn’t kill you will make you stronger.Or，as Ernest Hemimgway put it，“ Li fe breaks us all，but afterwards，many of us are strongestat the broken places.”5． What happened to the elms in Michigan during the agricultural disaster?A． The elms were tied by iron chains.B． Some of the elms were cut up into firewood.C． All the elms were infected by a disease and died.D． Nearly all of the elms died of a disease.6． From the passage we can learn that the old elm was saved by________.A． the groove in the b ark B． the fungus in the treeC． the iron remaining in it D． its own immune system7． The underlined sentence“ let_nature_take_its_course” means______.A． leave the elm at the mercy of natureB． help the elm grow normallyC． let nature take the elm awayD． have nature give a lesson to the elm8． What is the best title for the text?A． Never Lose Heart in TroubleB． Strike While the Iron is HotC． Brave to Face FailureD． Stronger after Suffering详解答案课时作业 ( 十六 )Ⅰ. 单项填空1．分析：考察社交用语。

手惰市安逸阳光实验学校Module 4 Sandstorms in Asia10．In recent years global warming is becoming a concern for people all over the world.Ⅱ.单句改错1．I caught the hold of her hand and carried her away.删除the2．I catch the bus just in time so I wasn't late.catch改为caught3．Before taking action you are strong recommended to consult an accountant.strong改为strongly4．Sorry to cut in you, but there are one or two things I don't understand.in后面加on5．Most of the houses seemed to have destroyed by the storm.have后面加been6．Going into hospital can be very frightened for a child.frightened改为frightening7．Neighbours complained the police about the dogs barking.complained后面加to________Y ours，L i Hua答案：范文赏读Dear_Sir/Madame,_I'm writing about the competition for free tickets to the Cinderella musical advertised on your website.Here's why I should win.I'm an18­year­old student, who's loved the Cinderella story since 4. Over those years, I've collected and read over 20 different book versions of Cinderella, seen all the Cinderella movies and twice attended play performances.So you can imagine how excited I was to hear the musical is coming to town. I've read that it's an incredible show with wonderful songs, amazing costumes and spectacular sets.Thanks for organising the competition and I hope I'm one of the lucky winners.If I am, my ticket can be sent to No.91 Zhongshan Road Guangzhou.Y ours,_L i_Hua大题巧练16Module 4Sandstorms in Asia[授课提示：对应学生用书第311页]一、阅读理解A(2017·石家庄模拟)In 1971 we were living in Wichita, Kansas—Lincoln was about seven, Brendan was three and Kristen was a baby. Mom was staying with us during the holidays. On Christmas Eve I stayed up very late. I was totally alone with my thoughts, alternating between joy and sorrow, and I got to thinking about my paper route(送报历程), that tree, what my mother had said to me and how dad had tried to make things better.I heard a noise in the kitchen and discovered that it was mom. She couldn't sleep either and had gotten up to make herself a cup of hot tea which made her feel better. As she waited for the water to boil, she walked into the living room and discovered me there. She saw my open Bible and asked me what I was reading. When I told her, she asked if I would readit to her and I did.When the kettle began to whistle, she went and made her tea. She came back. I told her how happy I was that she was with us for Christmas and how I wished that dad could have lived to see his grandchildren and to enjoy this time because he always loved Christmas so much. It got very quiet for a moment and then she said，“Do you remember that time on Twelve Mile Road when you bought that tree with your paper route money？”“Yes，” I said，“I've just been thinking about it you know.”She hesitated for a long moment, as though something was bottled up so deeply inside her soul that it might take surgery to get it out. Finally, great tears rolled down her face and she cried，“Oh, son, please forgive me. That time and that Christmas have been a burden on my heart for twenty­five years. I wish your dad were here so I could tell him how sorry I am for what I said.”语篇解读本文是一篇记叙文。

Module 4 Sandstorms in AsiaⅠ.单句语法填空1．He complained ______ me about the food.【答案】to2．If you don't cut down on your smoking，I will cut ______ your supply.【答案】off3．Usually what the teacher says will have a deep effect ______ a child.【答案】on4．After the rich man heard the touching story，he gave ______ most of his money to charity.【答案】away5．Would you please look ______ the paper for me and see if there are any obvious mistakes?【答案】through6．However carefully you are watching，you will find yourself easily ______(take) in when Liu Qian performs his magic tricks.【答案】taken7．It is a great honour for me ______(ask)to make a speech here.【答案】to be asked8．Care of the soul is a gradual process in ______ even the small details of life should be considered.【答案】which9．If he takes on this work，he will have no choice but ________(meet) an even greater challenge.【答案】to meet10．We've had a good start，but next，more work needs ______(do) to achieve the final success.【答案】to be doneⅡ.用所给短语的适当形式填空cut down，take in，in a nutshell，be caught in，look through，give out1．Who will______ a dirty pet like that?【答案】take in2．We should______ chemical plants to protect our environment.【答案】cut down3．To put it______ ，the show was a total disaster.【答案】in a nutshell4．The teacher is ______ the paper to the students waiting in the classroom.【答案】giving out5．______the article and give me the general idea.【答案】Look through6．He______the heavy snow last night.【答案】was caught inⅢ.完成句子1．这是一本如此有趣的书，以至于全班同学都想看。

2021年高考英语一轮复习 Module4 Sandstorms in Asia考点规范练16（含解析）外研版必修3Ⅰ.阅读理解AAn important scientific report announced“irrefutable(不能反驳的)proof”that climate change is happening and it’s all our fault.How long has it been before people are against the global warming idea?But here’s a funny st year there was a very bad hurricane season in the Caribbean when,among other disasters,New Orleans was all but wiped off the map.We were wisely informed by the experts at the time that this was owing to global warming.I remember watching a BBC science programme and hearing a learned professor witha beard tell us,“The increased frequency and strength of hurricanes is what we shall have to learn to expect given global warming.”This year there have been far fewer hurricanes and those there have been were relatively mild.Why?Good old global warming again of course. Professor Bjorn Lomborg,author of The Skeptical Environmentalist,writes,“In the constant media reports of possible greenhouse-related disasters,almost any event is now linked to climate change.”He adds,“We should not spend vast amounts of money to cut a tiny slice of the global temperature increase when this leads to a poor use of resources and when we could probably use these funds far more effectively in the developing world”.For saying this,Lomborg has had death threats.Other scientists who do not toe the global-warming-is-happening-and-it’s-all-our-fault line have received the same.There are plenty of people who count against global warming.A world of senior climatologists and meteorologists(气象学家) wrote to The Times last year to plain that they couldn’t get their research findings published—because they disagreed to it.We have had a warm autumn.Theexperts,fanatics(狂热者)all of them,put it down to global warming.If we have an extra cold winter,they will tell us it’s a result of global warming.If my big toe feels cold or hurts badly,it will be owing to global warming.1.The purpose of this text may be to .A.support the idea of global warminganise a debate about global warmingC.speak out against the global warming ideaD.encourage people to use money effectively2.What happened to New Orleans last year?A.It was badly destroyed.B.It disappeared in the world.C.It witnessed global warming.D.It experienced several disasters.3.From the text,we can infer that .A.people are taking measures to stop global warmingB.people have realized the side effects of developmentC.a different idea sometimes may cost one all his lifeD.the majorities usually stand for the correct opinion4.The main idea of the last paragraph may be .A.global warming may lead to toe’s catching cold in a senseB.The Times refuses to publish articles on global warmingC.a warming autumn is not related to global warming at allD.it is certainly incorrect to owe everything to global warmingBOne of the most ignored issues today is one that affects all life.Global warming and deforestation(森林开伐)are happening at a surprising rate,but it still seems like a foreign concept.The Earth’s te mperature has been increasing,though slowly,but this is something we cannot simply reverse (逆转).All the damage we do to our Earth is permanent (永久的),and though we have already done exceptional damage,we can stop it from worsening.This issue has not yet affected us directly,so we choose to ignore it and continue on with our everyday life.People have the need for visual evidence or proof before they decide that an issue is real,but by the time we have that evidence,it may be too late.About one and a half acres of our most important source of oxygen is lost every second.Our life source,the rainforest, is being eliminated(根除) for our own selfish reasons.Christ will return eventually,but until then,we must take care of our home.We are trying to live on a planet that is slowly being destroyed,and soon it will belike basketball players trying to dribble(运球前进)a ball on grass and mud.For the time being,our kindness depends on the resources God has given us,and it has bee like taking care of a pet.Parents will not allow a child a second dog until he shows he can take care of the first one,and God will not supply this Earth again until we show that we can be responsible and take care of it.Showing this reality can only e with time,but time is valuable and slowly running out.Many have taken the first few steps towards saving our planet,but our only hope for survival is that all of the world will realise this before it is too late.5.How do people react to the Earth’s environment?A.People pay much attention to it.B.People think little of it.C.People haven’t felt it at all.D.People have reduced the Earth’s temperature.6.The author thinks that we should .A.do less permanent damage to the EarthB.be kind to little animals such as dogsC.choose to ignore the environment issuesD.protect the environment as early as possible7.The author thinks that protecting the Earth .A.should be a self-conscious actionB.depends on the GodC.should be a forced actionD.depends on our desire8.Why does the author think humans can realise the importance of the environment in time?A.Because all humans think time valuable.B.Because all humans hope to save our planet.C.Because all humans long for survival.D.Because humans will take steps to save the Earth.Ⅱ.七选五1 It makes people suffer a lot from it.Why can’t they find a cure for the mon cold?The answer is easy.There are actually hundreds of kinds of cold viruses out there.You never know which one you will get. 2When a virus attacks your body,your body works hard to get rid of it. 3 You feel terrible because you can’t breathe well,but your body is actually eating the virus.Your temperature goes up and you get a fever,but the heat of your body iskilling the virus.You also have a runny nose to stop the virus from getting into your cells.You may feel very unfortable,but actually your wonderful body is doing everything it can to kill the cold.4 In China and some other countries,for example,some people might eat chicken soup to make themselves feel better.Some people take hot baths and drink warm liquids.Other people take medicine to stop various symptoms of colds.There is one interesting thing to note—some scientists say taking medicine when you have a cold is actually bad for you.The virus stays in your body longer because your body doesn’t have a way to fight it and kill it. 5 There is a joke,however,on taking medicine when you have a cold.It goes like this:it takes about one week to get over a cold if you don’t take medicine,but it takes only seven days to get over a cold if you take medicine.So you should trust the function of your body.A.Therefore,there isn’t a cure for each one.B.Bodies can indeed do an amazing job on their own.C.How much do you know about the various viruses in the world?D.Blood rushes to your nose and causes a block in it.E.Different people do different things to deal with the cold.F.The first thing you need to e up with is an idea for your cold.G.It is easy for many people to catch a cold in spring or fall.Ⅲ.书面表达请根据下列内容,在你校英语报刊上发表一篇稿件。

课时作业16Ⅰ.阅读理解(烟台一中高三适应性考试)Gwendolyn Brooks was the first African American to win a Pulitzer Prize for Poetry. Gwendolyn Brooks wrote hundreds of poems during her lifetime. She was known around the world for using poetry to increase understanding about black culture in America.Her poems described conditions among the poor, racial inequality and drug use in the black community. She also wrote poems about the struggles of black women. But her skill was more than her ability to write about struggling black people. She was an expert at the language of poetry. She combined traditional European poetry styles with the African American experience.In her early poetry, Gwendolyn Brooks wrote about the South Side of Chicago. The South Side of Chicago is where many black people live. In her poems, the South Side is called Bronzeville. It was A Street in Bronzeville that gained the attention of literary experts in 1945. Critics praised her poetic skill and her powerful descriptions of the black experience during the time. The Bronzeville poems were her first published collection.In 1950, Gwendolyn Brooks became the first African American to win the Pulitzer Prize for Poetry. She won the prize for her second book of poems called Annie Allen. Annie Allen is a collection of poetry about the life of a Bronzeville girl as a daughter, a wife and mother. She experiences loneliness, loss, death and being poor. Ms Brooks said that winning the prize changed her life.Her next work was a novel written in 1953 called Maud Martha. Maud Martha received little notice when it was first published. But now it is considered an important work by some critics. Its main ideas about the difficult life of many women are popular among female writers today.In some of her poems, Gwendolyn Brooks described how what people see in life is affected by who they are. One example is this poem, Corners on the Curing Sky.By the end of the 1960s, Gwendolyn brooks's poetry expanded from the everyday experiences of people in Bronzeville. She wrote about a wider world and dealt with important political issues.本文属于说明文阅读，作者通过这篇文章向我们介绍了格温德林·布鲁克斯，她是第一位获得普利策文学奖的非裔美国人。

Module4 Sandstorms in AsiaⅠ.阅读理解阅读如下短文，从每题所给的四个选项(A、B、C、D)中，选出最优选项。

ABEIJING，June 20 (Xinhua)—Over 60 million students and teachers at China's 80,000 middle schools experienced a special class delivered by China's first teacher in space from more than 300 kilometers above the Earth's surface.“Hello，everyone.I am Wang Yaping.I will host the lecture today.〞Female astronaut Wang Yaping，one of the three crew members of Shenzhou－X spacecraft，greeted about 330 students at a Beijing high school，through a live video feed system.The students in her class included children from migrant workers' families，of ethnic minorities and from Hong Kong，Macao and Taiwan.In this space class，Wang carried out some physics experiments about motion(运动) and surface tension(张力) of water in a micro－gravity environment(微重力环境)，which could help students better understand weight，mass and Newton's Laws.The most amazing one was “a water ball〞．Wang Yaping made a water film(水膜) with a water bag and a metal ring.She explained to students that the surface tension of water enlarges in space because of zero gravity.Then she made a second water film turn into a water ball.“I have been very excited since I learned I could come to this clas s，〞said Luo Jiangyuan，in his first year of high school.“When I learned about those laws of weightless condition at classes before，the teacher couldn't show the experiment for us，so I needed to imagine what would happen.But，at today's class，I am able to see what really happens.It is too exciting，〞 he said.Wang is the second Chinese female astronaut after Liu Yang.It was also the second video class delivered from above the Earth's surface，with the US astronaut Barbara Morgan's 25－minute class being the first in 2007.As some scientists believe，the lesson is aimed at making space science more popular.Space activities can also help the youth build up the spirit of seeking science and facing challenges.1．The best title for the passage would be________.A．China's First Teacher in Space—Wang YapingB．Shenzhou－X Astronaut Gives LectureC．Chinese Astronaut Gives the First Space LectureD．An Important Physical Experiment in Space解析：选C。

课时作业16Ⅰ.阅读理解(烟台一中高三适应性考试)Gwendolyn Brooks was the first African American to win a Pulitzer Prize for Poetry. Gwendolyn Brooks wrote hundreds of poems during her lifetime. She was known around the world for using poetry to increase understanding about black culture in America.Her poems described conditions among the poor, racial inequality and drug use in the black community. She also wrote poems about the struggles of black women. But her skill was more than her ability to write about struggling black people. She was an expert at the language of poetry. She combined traditional European poetry styles with the African American experience.In her early poetry, Gwendolyn Brooks wrote about the South Side of Chicago. The South Side of Chicago is where many black people live. In her poems, the South Side is called Bronzeville. It was AStreetinBronzeville that gained the attention of literary experts in 1945. Critics praised her poetic skill and her powerful descriptions of the black experience during the time. The Bronzeville poems were her first published collection.In 1950, Gwendolyn Brooks became the first African American to win the Pulitzer Prize for Poetry. She won the prize for her second book of poems called AnnieAllen. AnnieAllen is a collection of poetry about the life of a Bronzeville girl as a daughter, a wife and mother. She experiences loneliness, loss, death and being poor. Ms Brooks said that winning the prize changed her life.Her next work was a novel written in 1953 called MaudMartha. MaudMartha received little notice when it was first published. But now it is considered an important work by some critics. Its main ideas about the difficult life of many women are popular among female writers today.In some of her poems, Gwendolyn Brooks described how what people see in life is affected by who they are. One example is this poem, CornersontheCuringSky.By the end of the 1960s, Gwendolyn brooks's poetry expanded from the everyday experiences of people in Bronzeville. She wrote about a wider world and dealt with important political issues.本文属于说明文阅读，作者通过这篇文章向我们介绍了格温德林·布鲁克斯，她是第一位获得普利策文学奖的非裔美国人。

手惰市安逸阳光实验学校Module 4 Sandstorms in AsiaⅠ.单词拼写1．You can't expect the reward to be related to the effort; the ________(过程) of learning is more important.2．We enjoyed the ________(氛围) where we could talk in a friendly way.3．________(证据) has been piled up that drinking water after getting up in the morning contributes to one's health.4．He is ________(担心的) about his son's health.5．They ________(抱怨)their children have too much homework to do.6．They know that our country is in ________(紧急的)need of those who have much knowledge.7．The shady trees provide ________(保护) against burning rays of the sun.8．The film was very ________(可怕的)．I was scared to death when I was seeing it.答案 1.process 2.atmosphere 3.Evidence 4.concernedplain6.urgent7.protection8.frighteningⅡ.翻译句子1．大家冷吗？不冷的话打开窗户啦。

(省略句)________________________________________________________________________2．我没有力气再往上爬了。

Module 4 Sandstorms in AsiaⅠ.单词拼写/用所给词的正确形式填空1．Xian is an __________ (内陆的) city, whose scenery is very beautiful.[答案]inland2．I'm used to watching weather __________ (预报) on TV every night.[答案]forecast3．It was a __________ (恐怖的) scene, which made the boy crying all the time.[答案]scary4．The shuttle Columbia will reenter Earth's __________ (大气层) tomorrow morning.[答案]atmosphere5．The aim would be to __________ (循环) 98 percent of domestic waste.[答案]recycle6．The man __________ (complaint) about the food quality.[答案]complained7．You are __________ (absolute) mistaken. On the contrary, you have done a good job.[答案]absolutely8．Any __________ (city) should obey the law.[答案]citizen9．Our parents are __________ (concern) about our safety when we leave home.[答案]concerned10．The __________ (majority) students come from the countryside.[答案]majorⅡ.单句改错1．The goods have been received, but we have to make a complain about packing though we regret to do so.____________[答案]complain→complaint2．When the fire broke out in the ship, Sally was frightening out of her wits.____________[答案]frightening→frightened3．Last year I went to Beijing, where I got caught on traffic jam one night.____________[答案]on→in4．Here are some tall trees, and villagers are going to cut down for building materials.____________[答案]cut后加them5．She won't show any evidence unless being asked to.____________[答案]去掉being6．There are such many people there that we couldn't get through.____________ [答案]such→soⅢ.阅读理解(2017·全国卷Ⅲ)Af ter years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.The disappearance of the wolves had many unexpected results. Deer and elk populations—major food sources (来源) for the wolf—grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park's red foxes, and completely drove away the park's beavers.As early as 1966，biologists asked the government to consider reintroducing wolves to Yellowstone Park.They hoped that wolves would be able to control the elk and coyote problems.Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.The government spent nearly 30 years coming up with a plan to reintroduce the wolves. The US Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone.Today，the debate continues over how well the gray wolf is fitting in at Yellowstone.Elk，deer，and coyote populations are down，while beavers and red foxes have made a comeback.The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.语篇解读：本文介绍了以前灰狼遍地的黄石国家公园，由于人为的原因灰狼逐渐消失，从而造成了一系列不良后果，破坏了当地生态的平衡，为了维持生态平衡，现在人们又鼓励重新引入灰狼。