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ID:21731759
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页数:6页
时间:2018-10-24
《大学英语四级模拟题四(含答案)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、大学英语四级模拟题四一二三四五六试卷总得分核查人PartOneReadingComprehension(2’×10=20’)Directions:Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).Youshoulddecideonthebestchoiceandmarkthecorrespondi
2、ngletterontheAnswerSheetwithasinglelinethroughthecentre.PassageOneAirpollutioncanspreadfromcitytocity.Itevenspreadsfromonecountrytoanother.SomenorthernEuropeancountrieshavehad“blacksnow”frompollutantsthathavetraveledthroughtheairfromothercountriesandhavefallenwithth
3、esnow.Soairpollutionisreallyaglobalproblem.Airpollutioncankillbabies,olderpeople,andthosewhohaverespiratory(呼吸的)diseases.Asfoundincities,airpollutionincreasestherisksofcertainlungdiseases.Airpollutioncancausebothairplaneandcaraccidentsbecauseitcutsdownvisibility(能见度
4、).Thereareotherpossiblehealthdangersfromairpollutionthatwedon’tknowmuchabout.Forexample,scientistsaretryingtofindoutwhetherchemicalsthatreachusfromtheairmaycausechangesinourcells.Thesechangesmightcausebabiestobebornwithseriousbirthdefects.Scientistsaretryingtolearnh
5、owallthemanychemicalsareapt(易于的)totakeintoourbodiesfromair,water,food,andevenmedicinesacttogethertoaffectourhealthandthewayourbodieswork.Thatisanotherreasonwhyitissoimportanttobegintocontrolpollutionnowinsteadofwaitinguntilwelearnalltheanswers.Airpollutioncostsusalo
6、tofmoney.Itcorrodes(腐蚀)ourbuildings.Itdamagesfarmcropsandforests.Ithasadestructiveeffectonourworksofart.Thecostofallthisdamagetoourgovernmentisgreat.Itwouldbemuchmoreworthwhile,bothforusandforthegovernment,tospendourtaxdollarsonairpollutioncontrol.1.Airpollutionmayl
7、eadtoairplaneaccidentsbecause.A.itmaycausepilotstobeillB.enginesmayfailfromtheair-bornedirtC.visibilityisreducedD.itbringsalotofblacksnow2.Scientistsaretryingtofindalinkbetweenpollutionand.A.intelligencelevelsB.birthproblemsC.man’sbehaviorD.thenervoussystem3.Scienti
8、stshavenotyetdetermined.A.alloftheeffectsofpollutiononthehumanbodyB.howpollutioncanbecontrolledsuccessfullyC.whentheatmospherefirstbecamep
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