大学英语四级模拟题四.doc

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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).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheetwit

2、hasinglelinethroughthecentre.PassageOneAirpollutioncanspreadfromcitytocity.Itevenspreadsfromonecountrytoanother.SomenorthernEuropeancountrieshavehad“blacksnow”frompollutantsthathavetraveledthroughtheairfromothercountriesandhavefallenwiththesnow.Soairpollutionisreallyaglobalproblem.Airpollutio

3、ncankillbabies,olderpeople,andthosewhohaverespiratory（呼吸的）diseases.Asfoundincities,airpollutionincreasestherisksofcertainlungdiseases.Airpollutioncancausebothairplaneandcaraccidentsbecauseitcutsdownvisibility（能见度）.Thereareotherpossiblehealthdangersfromairpollutionthatwedon’tknowmuchabout.Fore

4、xample,scientistsaretryingtofindoutwhetherchemicalsthatreachusfromtheairmaycausechangesinourcells.Thesechangesmightcausebabiestobebornwithseriousbirthdefects.Scientistsaretryingtolearnhowallthemanychemicalsareapt（易于的）totakeintoourbodiesfromair,water,food,andevenmedicinesacttogethertoaffectour

5、healthandthewayourbodieswork.Thatisanotherreasonwhyitissoimportanttobegintocontrolpollutionnowinsteadofwaitinguntilwelearnalltheanswers.Airpollutioncostsusalotofmoney.Itcorrodes（腐蚀）ourbuildings.Itdamagesfarmcropsandforests.Ithasadestructiveeffectonourworksofart.Thecostofallthisdamagetoourgove

6、rnmentisgreat.Itwouldbemuchmoreworthwhile,bothforusandforthegovernment,tospendourtaxdollarsonairpollutioncontrol.1.Airpollutionmayleadtoairplaneaccidentsbecause.A.itmaycausepilotstobeillB.enginesmayfailfromtheair-bornedirtC.visibilityisreducedD.itbringsalotofblacksnow2.Scientistsaretryingtofi

7、ndalinkbetweenpollutionand.A.intelligencelevelsB.birthproblemsC.man’sbehaviorD.thenervoussystem3.Scientistshavenotyetdetermined.A.alloftheeffectsofpollutiononthehumanbodyB.howpollutioncanbecontrolledsuccessfullyC.whentheatmospherefirstbecamep