大学英语四级模拟题四(含答案~)

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2、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).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswe

3、rSheetwithasinglelinethroughthecentre.PassageOneAirpollutioncanspreadfromcitytocity.Itevenspreadsfromonecountrytoanother.SomenorthernEuropeancountrieshavehad“blacksnow”frompollutantsthathavetraveledthroughtheairfromothercountriesandhavefallenwiththesnow.Soairpollutionisreallyaglobalpr

4、oblem.Airpollutioncankillbabies,olderpeople,andthosewhohaverespiratory（呼吸的）diseases.Asfoundincities,airpollutionincreasestherisksofcertainlungdiseases.Airpollutioncancausebothairplaneandcaraccidentsbecauseitcutsdownvisibility（能见度）.Thereareotherpossiblehealthdangersfromairpollutionthat

5、wedon’tknowmuchabout.Forexample,scientistsaretryingtofindoutwhetherchemicalsthatreachusfromtheairmaycausechangesinourcells.Thesechangesmightcausebabiestobebornwithseriousbirthdefects.Scientistsaretryingtolearnhowallthemanychemicalsareapt（易于的）totakeintoourbodiesfromair,water,food,andev

6、enmedicinesacttogethertoaffectourhealthandthewayourbodieswork.Thatisanotherreasonwhyitissoimportanttobegintocontrolpollutionnowinsteadofwaitinguntilwelearnalltheanswers.Airpollutioncostsusalotofmoney.Itcorrodes（腐蚀）ourbuildings.Itdamagesfarmcropsandforests.Ithasadestructiveeffectonourw

7、orksofart.Thecostofallthisdamagetoourgovernmentisgreat.Itwouldbemuchmoreworthwhile,bothforusandforthegovernment,tospendourtaxdollarsonairpollutioncontrol.1.Airpollutionmayleadtoairplaneaccidentsbecause.A.itmaycausepilotstobeillB.enginesmayfailfromtheair-bornedirtC.visibilityisreducedD

8、.itbringsalotofblacksnow2.Scientistsaretryingtofindalinkbetweenpollutionand.A.intelligencelevelsB.birthproblemsC.man’sbehaviorD.thenervoussystem3.Scientistshavenotyetdetermined.A.alloftheeffectsofpollutiononthehumanbodyB.howpollutioncanbecontrolledsuccessfullyC.whentheatmospherefirstb

9、ecame