大学英语四级模拟题四(含答案)

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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).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheetwithasi

2、nglelinethroughthecentre.PassageOneAirpollutioncanspreadfromcitytocity.Itevenspreadsfromonecountrytoanother.SomenorthernEuropeancountrieshavehad“blacksnow”frompollutantsthathavetraveledthroughtheairfromothercountriesandhavefallenwiththesnow.Soairpollutionisreallyaglobalproblem.Airpollutioncankill

3、babies,olderpeople,andthosewhohaverespiratory（呼吸的）diseases.Asfoundincities,airpollutionincreasestherisksofcertainlungdiseases.Airpollutioncancausebothairplaneandcaraccidentsbecauseitcutsdownvisibility（能见度）.Thereareotherpossiblehealthdangersfromairpollutionthatwedon’tknowmuchabout.Forexample,scien

4、tistsaretryingtofindoutwhetherchemicalsthatreachusfromtheairmaycausechangesinourcells.Thesechangesmightcausebabiestobebornwithseriousbirthdefects.Scientistsaretryingtolearnhowallthemanychemicalsareapt（易于的）totakeintoourbodiesfromair,water,food,andevenmedicinesacttogethertoaffectourhealthandthewayo

5、urbodieswork.Thatisanotherreasonwhyitissoimportanttobegintocontrolpollutionnowinsteadofwaitinguntilwelearnalltheanswers.Airpollutioncostsusalotofmoney.Itcorrodes（腐蚀）ourbuildings.Itdamagesfarmcropsandforests.Ithasadestructiveeffectonourworksofart.Thecostofallthisdamagetoourgovernmentisgreat.Itwoul

6、dbemuchmoreworthwhile,bothforusandforthegovernment,tospendourtaxdollarsonairpollutioncontrol.1.Airpollutionmayleadtoairplaneaccidentsbecause.A.itmaycausepilotstobeillB.enginesmayfailfromtheair-bornedirtC.visibilityisreducedD.itbringsalotofblacksnow2.Scientistsaretryingtofindalinkbetweenpollutiona

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