大學(xué)英語四級考試模擬試題四及答案詳解

大學(xué)英語四級考試模擬試題四及答案詳解

PartIWriting(30minutes)

Directions:Forthispart,youareallowed30minutestowriteanAddressofWelcome.Youshould

writeatleast120wordsfollowingtheoutlinegivenbelow.

學(xué)生會(huì)邀請了來自某大學(xué)的李教授作一個(gè)關(guān)于計(jì)算機(jī)人工智能的演講。作為主持人，你在演

講前作一個(gè)開場白。請寫一份簡明的歡迎詞。（1.簡明介紹演講者；2.計(jì)算機(jī)人工智能的作

用；3.表示歡迎等）

AddressofWelcome

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11.A)Neitherofthemhasafavorableopinionoftheservice.

B)Thewomanishavingaterribletimeservingintherestaurant.

C)Bothagreethatitistimefortherestauranttofiresomestaff.

D)Themanthinkstherestaurantisallright,butthewomandoesn't.

12.A)Heeatstoomuchwhenheplayschess.

B)Hewon'tjointhechessclub.

C)Chessishisfavoritegame.

D)Hedoesn'tenjoychessasmuchasheusedto.

13.A)Annshouldshutthedoor.

B)Annshouldbequieter.

C)Annshouldn'thavestayedatthelibrarysolong.

D)Annshouldn'thavereturnedhome.

14.A)Shehasanothermeetingallday.

B)Shefeelsthegradeisallright.

C)Shethinksitwouldbewrongtochangethegrade.

D)Shecanmeetwiththestudentthatafternoon.

15.A)Theclothesdon'tlookcleantohim.

B)Hedoesn'tintendtogettheclothes.

C)Thewomancanpickoutherownclothes.

D)Thewomanshouldstopstaringathisclothes.

16.A)Shewon'tbeabletocome.

B)She'snotgoingtograduate.

C)Shehasaweektodothework.

D)She'llvisithersisterinaweek.

17.A)Shethinksahairdryer.

B)Shewantstoknowwhat'smakingallthenoise.

C)Sheisn'tsurehowpracticaltheman'sgiftis.

D)Shecan'thearanythingwhenthehairdryerison.

18.A)Shehasn'treadthepassage.

B)Shedoesn'tunderstanditeither.

C)Shecannotreaditindarkness.

D)Shesuggeststhatthemanreadit.

Questions19to22arebasedontheconversationyouhavejustheard.

19A)Shereceivedanemergencycallthepreviousday.

B)Shehasneverbeentothecitybefore.

C)Shewouldgotheretospendtheweekendwithhersister.

D)Shewasinvitedtoattendhersister'swedding.

20.A)Inlessthananhour.C)At11:13.

B)Inaminute.D)Atnoon.

21.A)Someonetotalkwith.

B)Interestingbookstoread.

C)Somethingtoeatanddrink.

D)Puzzlesandcrosswordgames.

22.A)Thirteenpennies.C)Apound.

B)Fiftypennies.D)Halfprice.

Questions23to25arebasedontheconversationyouhavejustheard.

23.A)It'sratherexpensive.

B)It'stoosmallfortheman.

C)Ithasplentyoflight.

D)Itdoesn'thavemanyclosets.

24.A)Eachtenantisgivenaparkingplace.

B)It'sdifficulttofindaparkingplace.

C)Thetenanthastopaytopark.

D)Thetenantcanuseanyspaceintheparkingarea.

25.A)He'sunimpressedbywhatthewomantoldhim.

B)Hedoubtshecanaffordit.

C)Hedoesn'tthinkit'ssuitableforhim.

D)He'senthusiasticaboutit.

SectionB:

Directions:Inthissection,youwillhear3shortpassages.Attheendofeachpassage,youwill

hearsomequestions.Boththepassageandthequestionswillbespokenonlyonce.Afteryouhear

aquestion,youmustchoosethebestanswerfromthefourchoicesmarkedA),B),C)andD).

ThenmarkthecorrespondingletteronAnswerSheet2withasinglelinethroughthecentre.

PassageOne

Questions26to28arebasedonthepassageyouhavejustheard.

26.A)Theircostisverylow.

B)Theycanbeusedinmanycountries.

C)Thewillnotpollutetheenvironment.

D)Theyneedlittleexperimentation.

27.A)Itgathersheatfromthesun.

B)Itpushesaturbineinadam.

C)Itcauseswindstoturnawindmill.

D)Itwarmsupthelandalongthecoast.

28.A)SlowingdowntheEarth'srotation.

B)Harmingthecoastline.

C)Changingthewavepattern.

D)Pollutingthewater.

PassageTwo

Questions29to31arebasedonthepassageyouhavejustheard.

29.A)Astudyofaresearchcorporation.

B)Oneoflife'sessential.

C)Thereasonswhypeopledon'tlikebreakfast.

D)Breakfastandhumanhealth.

30.A)Takingnobreakfastdoesgoodtoone'shealth.

B)Takingnobreakfastdoesnoharmtoone'shealth.

C)Scientificevidenceisnotenough.

D)Eatinglittleinthemorningisgoodforus.

31.A)Anyonewithoutbreakfastdoesimprovehisperformance.

B)Nothavingbreakfastimproveone'sperformance.

C)Havingbreakfastimproveone'sperformance.

D)Performanceisnotrelatedtowhetherhavingbreakfastornot.

PassageThree

Questions32to35arebasedonthepassageyouhavejustheard.

32.A)HowRayKrocmademoneyforthebrothers.

B)Howtostartourownrestaurant.

C)ArestaurantinCaliforniain1948.

D)HowtheMcDonald'sbusinessstartedandgrew.

33.A)Theywantedcustomerstopayless.

B)Customerswouldgettheirmealsquickly.

C)Theycoulduseplasticplates.

D)Theydidn'tneedwaitersandwaitresses.

34.A)Thefoodwasdeliciousandhealthful.

B)Itwasquickandcheap.

C)Itwasfamousinthecity.

D)Itwasdifferentandnew.

35.A)Theycouldmakealotoffriendsthere.

B)Theylikedthebrothers.

C)Theyenjoyedthefood,thetoysandthegamesthere.

D)Theirparentsaskedthemtogothere.

SectionC:

Directions:Inthissection,youwillhearapassagethreetimes.Whenthepassageisreadforthe

firsttime,youshouldlistencarefullyforitsgeneralidea.Whenthepassageisreadforthesecond

time,youarerequiredtofillintheblanksnumberedfrom36to43withtheexactwordsyouhave

justheard.Forblanksnumberedfrom44to46youarerequiredtofillinthemissinginformation.

Fortheseblanks,youcaneitherusetheexactwordsyouhavejustheardorwritedownthemain

pointsinyourownwords.Finally,whenthepassageisreadforthethirdtime,youshouldcheck

whatyouhavewritten.

Britainischangingmorerapidlythaneverbeforeinherlonghistory.Insomerespectsthenew

Britishsociety(36)____________generalworldtrends.Inotherrespectsithaskeptitsown(37)

_________flavor.Britishsocietyisevolving,thatistosay,developingandsuitingitselftorapidly

changingconditions.Evolutionratherthanrevolutionorviolentchangeisaspecial(38)

_________oftheBritishwayoflife.

ThisisshowninonewaybyhowtheBritishpeoplevoteat(39)___________.TheConservative

andLaborPartieshavecontrolledthe(40)__________sceneforthelastfiftyyears,buttoday

neitherpartycananylongerbesurefromwhichclassorincomegroupits(41)_________will

come.NotlongagoyouwouldhaveexpectedtheworkingclassesalwaystovotefortheLabor

Party.Theword"labor"means"hardwork"-(42)___________hardworkwiththehands.The

LaborPartyisthepartywhichissupposedto(43)__________the"workingman".Youwould

alsohaveexpectedtheupperandmiddleclassestovotefortheConservativeParty.Theword

conservativemeans"keepingthingsastheyare".TheConservativeParty(44)

_______________________________________________________________________________.

InsomerespectstraditionalBritish"classdistinctions"arebecominglessclear,andyoucanbe

lesssurehowpeoplewillvote.Manymembersofthemiddleclasssupportsocialreform.Many

ordinaryworkingpeople(45)_______________________________________________________

__________________________________.Buttheolddivisionsbetweentheclassesremain.

ManyConservativesfearthatthesovereigntyofParliamentisbeingthreatenedbytheTrade

Unions.ManyworkersareafraidthattheConservativebossesaretryingtokeeptheirwagesdown.

Butclassfeelingshavenotreachedapersonallevelyet.(46)____________________

_________________________________________________________________.

PartIIReadingComprehension(SkimmingandScanning)(15minutes)

Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthe

questionsonAnswersheet1.

Forquestions1-7,mark

Y(forYES)ifthestatementagreeswiththeinformationgiveninthepassage;

N(forNO)ifthestatementcontradictstheinformationgiveninthepassage;

NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.

Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.

NewProposalsonYouthEmployment

TheunemploymentrateinJapancontinuestohoverataroundthe5%level,butthenumberof

unemployedyouthsisexceptionallyhighcomparedtootheragegroups.Thefluidsituationis

graduallytakingrootinsociety,withanincreasingnumberofyouthsmakingalivingas"freeters"

(asyoungjob-hoppersarecalledinJapan)orleavingandchangingjobsevenaftertheyfind

employment.Thisyouthemploymentproblemisessentiallyaproductofmanycompanies'

guardedstance(姿態(tài))onemploymentandthenarrowingofemploymentopportunitiesforthose

seekingtoworkasregularemployees.

Todealwiththeyouthemploymentproblem,thegovernmentandrelevantinstitutionshave

alreadypresentedvariousproposalsforspecificpolicies,suchastostrengthenpoliciesthatcan

turneconomicrecoveryintoavigorousincreaseoflabordemand;whileexpandingjobopenings

forregularemployees,alsotopromoteequaltreatmentofnon-regularemployeesandsecure

opportunitiesforthemtobecomeregularemployeessothattheworkingstylesofnon-regular

employeesarenotdisadvantaged;fromtheearlieststageaspossible,systematicallytoprovidejob

preparatoryeducationwithalong-rangeoutlookoncareerdevelopment.Someofthesepolicies

areactuallybeingimplemented,buttheyarenotnecessarilyproducingadequateresults.Forthis

reason,thefollowingthreenewmeasuresshouldbeconsideredinadditiontoothermeasures

beingdeliberated.

Reformofemploymentandrecruitmentpractices

?Itisimportantthathighschoolgraduatesaregivenasmanyopportunitiesaspossibletoselectan

occupation.Whilecompletelyabolishingtheone-person-one-companysystemononehand,onthe

otherhand,employmentandcareerguidanceshouldbeginwhenstudentsenterhighschoolso

theyarewellabletoselectanoccupationontheirownjudgment.

?Also,theyearaftergraduationshouldberegardedasaperiodofjointfollow-upbyschoolsand

employmentagencies.Especiallyinregardtounemployedgraduatesandfreeters,eachparty

shouldassessthesituationandsupporttheemploymentofthoseyoungpeople.

?Withrespecttocollegestudents,internshipopportunities,careercounseling,andotherguidance

schemesshouldbeimplementedsoonaftertheyentercollegetoeventuallyenablethemtomake

independentcareerdecisions.

?Companiesshouldgivedueconsiderationtotheacademicaccomplishmentofstudentswhen

screeningjobapplicants,asthatistheprimaryfunctionofstudents.Universitiesshoulddrawupon

France'sbaccalaureatesystem,forexample,andintroduceasystemofuniversitygraduation

examinationorcollegeacademiccertificationtest.

?Finally,asameasuretoexpandemploymentopportunities,companiesshouldamendtheir

traditionalpracticeofrecruitingonlyprospectivenewgraduatesandopentheirdoorstothosewho

havealreadygraduated.

Enhancingcareereducationandtheroleofindustries

?Careereducationaimingtocultivateworkvaluesshouldbeaconsecutive(連續(xù)的)program

providedoveranampleamountoftimebeginningintheprimary,juniorhigh,andhighschool

compulsoryeducationstage.

?Inadditiontoteachingstudentsaboutthesignificanceofworkingandaboutoccupationsin

general,careereducationshouldalsoincludeacourseon"workanddailyliving"asa

comprehensivecourseaimingtopreparestudentstobecomeworkingmembersofsociety.The

courseshoulddealwithabroadrangeoftopicsrelatingtotheworkconcept,suchasrightsand

obligationsstipulatedinlaborlaws,aswellaswiththemechanicsofthepensionsystemandother

socialsecurityinstitutionsandwithsuchimmediateissuesastheenvironmentandenergy.Sucha

coursewouldhelpyouthstoselecttheirownlifestyles,includinghowtoachieveagoodbalance

betweenworkandprivatelife.

?Theindustrialcommunityshouldformorganizationsofcompanies(suchasNPOs)toaddress

careereducationfromacross-cuttingperspectiveandactivelyengageinactivitiestosupportthe

developmentofhumanresourcesforthenextgeneration.Forexample,theyareexpectedto

developandprovideeducationalprogramsbasedontheiruniquetechnologyandknow-how,send

personneltoschools,andofferfundsandequipment.

?InregionalareasinJapan,activitiestorevitalizeregionalindustriesandpromotenewindustries

shouldbelinkedtomodelprojectsthatincorporateregionalcharacteristicsandaimtofosterand

retainyoungpeopleasfutureleadersoftheregion.Forexample,localgovernmentscouldutilize

the500orsoyoungworkers'centersthroughoutJapanasthebasesofsuchprojectswiththe

cooperationofregionalbusinessesandschools.

Proposalofa"careerpassport"

?The"careerpassport"wouldfunctionasarecordofone'scareerandasacertificationforthe

utilizationofvarioussupportmeasures.Itwouldbeissuedtoallyouthsovertheageof18and

wouldbeapassporttocontinuoussupportvaliduptotheageof30to35.

?Thepassportwouldcontainarecordofjobchanges,part-timeexperiences,studies,certifications

andself-developmentefforts,inadditiontoaccomplishmentsachievedthroughparticipationin

volunteerandNPOactivities.Inthisrespect,itwouldtaketheformofanelectroniccardtoallow

theinputandaccumulationofinformationthroughadigitalformatthatcanbeaccessedbythe

individualwhenevernecessary.

?Thepassportwouldenableyoungworkerstoreceivecareercounselingregularlyorasnecessary

atjobcafesthatarebeingnewlyestablishedoratthemorethan500youngworker'scenters

throughoutJapan.Theywouldalsohavetheopportunitytocheckandevaluatetheirowncareers,

includingpart-timeexperiences,andeffectivelyutilizevarioussupportprogramsforemployment,

capacitydevelopmentandotherareasnecessaryfordevelopingtheircareers.

?Inadditiontotheabove,avocationalscholarshipsystemshouldbecreatedtoprovidefinancial

supportforeducationalcoursesandschoolexpensestoallyoungpeoplewhohavegraduated

school-includingtheunemployed,freeters,anddisplacedworkers-sothattheymayvoluntarily

preparethemselvesforajobordeveloptheirworkingcapacities.

1.Theyouthfrequentjobchangesresultinmanycompanies'guardedstanceontheiremployment.

2.Toofferdifferentjobopportunitiestobothyouthregularandnon-regularemployees.

3.Employmentandcareerguidanceshouldbepartofhighschoolcurriculum.

4.Companiesshouldrevisetheirpoliciestorecruitbothnewandoldgraduates.

5.Theschoolcourseshoulddealwithabroadrangeoftopicsrelatingtotheworkconceptsuchas

jobhuntingandhopping.

6.Thereareabout500youthcentersinsomelocalareas.

7.Thecareerpassportcontainspart-timeexperiences,studies,certificateandself-development

exceptjob-hopping.

8.Collegeeducationshouldenablestudentstomake____________________.

9.Companiesshouldprovideeducationalprogramandsendpersonneltoschoolsandoffer

____________________.

10.Inordertoprovideyoungpeoplewithfinancialsupport,weshouldcreate________________

________.

PartIIIListeningComprehension(35minutes)

SectionA

Directions:Inthissection,youwillhear8shortconversationsand2longconversations.Atthe

endofeachconversation,oneormorequestionswillbeaskedaboutwhatwassaid.Boththe

conversationandthequestionswillbespokenonlyonce.Aftereachsectiontherewillbeapause.

Duringthepause,youmustreadthefourchoicesmarkedA),B),C)andD),anddecidewhichis

thebestanswer.ThenmarkthecorrespondingletteronAnswerSheet2withasinglelinethrough

thecentre.

PartIVReadingComprehension(ReadinginDepth)(25minutes)

SectionA

Directions:Inthissection,thereisapassagewithtenblanks.Youarerequestedtoselectoneword

foreachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassage

throughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.

PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethrough

thecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.

Questions47to56arebasedonthefollowingpassage.

Oncetheworldembracedtheautomobile,thedaysofdependingonhorses,bicycles,ferries,and

trainsquicklyslippedintothepast.Peoplewere__47__withthespeedoftheautomobilebutthey

werealsoenjoyingthepersonalfreedomthattheautomobilegavethem.Owningacargavepeople

thefreedomtogoanyplacearoad__48__.Thisallowedpeopletotravelatanytimeandattheir

own__49__.Thisindependencegavethecarapopularedgeoverbusesandtrains.

Thepopularityoftheautomobilemadeitthe__50__ofthetransportationsystem.Theautomobile

changedourliveswhenitcreatedagiantindustrythatofferedmoreandmorejobs.The

automobilemadeitpossibleforpeopletoliveinareas__51__fromtheirworkplace.Thiscaused

citiestogrowandmadesuburbanlivingmoreconvenient.Ofcourse,withmoreplacestogo,

more__52__roadshadtobebuilt.Theautomobilecauseda__53__effect.Jobsincreased,

industriesgrew,newindustriesdeveloped,andcitiesappeared.Todaytheautomobileindustry

continuestooffermany__54__.Jobsareplentifulinthisindustryandimprovementscontinueto

bemadetotheautomobilewithnewtechnologies.

Wehavecomealongwayfromthatfirst__55__carriagebecauseofthecooperativeeffortsof

manypeopleinthelastcentury.Itwillbeinterestingtoseewhatthefutureholdsforthe

automobile.Wehavealreadyseensignsoftheuseofsolarenergyinthisarea.Aslongasmanhas

abrain,thefutureoftheautomobileis__56__.

A)backboneI)opportunities

B)infiniteJ)snowball

C)furtherK)definite

D)backgroundL)developed

E)ledM)farther

F)enjoyedN)impressed

G)horselessO)pace

H)developing

SectionB

Directions:Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsor

unfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).You

shoulddecideonthebestchoiceandmarkthecorrespondingletteronAnswerSheet2witha

singlelinethroughthecentre.

PassageOne

Questions57to61arebasedonthefollowingpassage.

Ifyouwanttoteachyourchildrenhowtosaysorry,youmustbegoodatsayingityourself,

especiallytoyourownchildren.Buthowyousayitcanbequitetricky.

Ifyousaytoyourchildren"I'msorryIgotangrywithyou,but…"whatf"oclalnowsthat"but

rendertheapologyineffective:"Ihadabadday"or"yournoisewasgivingmeaheadache"leaves

thepersonwhohasbeeninjuredfeelingthatheshouldbeapologizingforhisbadbehaviorin

expectinganapology.

Anothermethodbywhichpeopleappeartoapologizewithoutactuallydoingsoistosay"I'm

sorryyou'reupset";thissuggeststhatyouaresomehowatfaultforallowingyourselftogetupset

bywhattheotherpersonhasdone.

Thenthereisthegeneral,allcoveringapology,whichavoidsthenecessityofidentifyingaspecific

actthatwasparticularlyhurtfulorinsulting,andwhichthepersonwhoisapologizingshould

promisenevertodoagain.Saying"I'muselessasaparent"doesnotcommitapersontoany

specificimprovement.

Thesepseudo-apologiesareusedbypeoplewhobelievesayingsorryshowsweakness.Parents

whowishtoteachtheirchildrentoapologizeshouldseeitasasignofstrength,andthereforenot

resorttothesepseudo-apologies.

Butevenwhenpresentedwithexamplesofgenuinecontrition,childrenstillneedhelptobecome

awareofthecomplexitiesofsayingsorry.Athree-year-oldmightneedhelpinunderstandingthat

otherchildrenfeelpainjustashedoes,andthathittingaplaymateovertheheadwithaheavytoy

requiresanapology.Asix-year-oldmightneedremindingthatspoilingotherchildren's

expectationscanrequireanapology.A12-year-oldmightneedtobeshownthatraidingthebiscuit

tinwithoutaskingpermissionisacceptable,butthatborrowingaparent'sclotheswithout

permissionisnot.

57.Ifamotheradds"but"toanapology,_______.

A)shedoesn'tfeelthatsheshouldhaveapologized

B)shedoesnotrealizethatthechildhasbeenhurt

C)thechildmayfindtheapologyeasiertoaccept

D)thechildmayfeelthatheowesheranapology

58.Accordingtotheauthor,saying"I'msorryyou'reupset"mostprobablymeans"_______".

A)Youhavegoodreasontogetupset

B)I'mawareyou'reupset,butI'mnottoblame

C)Iapologizeforhurtingyourfeelings

D)I'matfaultformakingyouupset

59.Itisnotadvisabletousethegeneral,all-coveringapologybecause_______.

A)itgetsoneintothehabitofmakingemptypromises

B)itmaymaketheotherpersonfeelguilty

C)itisvagueandineffective

D)itishurtfulandinsulting

60.Welearnfromthelastparagraphthatinteachingchildrentosaysorry_______.

A)thecomplexitiesinvolvedshouldbeignored

B)theiragesshouldbetakenintoaccount

C)parentsneedtosetthemagoodexample

D)parentsshouldbepatientandtolerant

61.Itcanbeinferredfromthepassagethatapologizingproperlyis_______.

A)asocialissuecallingforimmediateattention

B)notnecessaryamongfamilymembers

C)asignofsocialprogress

D)notassimpleasitseems

PassageTwo

Questions62to66arebasedonthefollowingpassage.

Leaddeposits,whichaccumulatedinsoilandsnowduringthe1960'sand70's,wereprimarilythe

resultofleadedgasolineemissionsoriginatingintheUnitedStates.Inthetwentyyearsthatthe

CleanAirActhasmandatedunleadedgasuseintheUnitedStates,theleadaccumulation

world-widehasdecreasedsignificantly.

AstudypublishedrecentlyinthejournalNatureshowsthatair-borneleadedgasemissionsfrom

theUnitedStatesweretheleadingcontributortothehighconcentrationofleadinthesnowin

Greenland.ThenewstudyisaresultofthecontinuedresearchledbyDr.CharlesBoutron,an

expertontheimpactofheavymetalsontheenvironmentattheNationalCenterforScientific

ResearchinFrance.AstudybyDr.Boutronpublishedin1991showedthatleadlevelsinarctic北(

極的)snowweredeclining.

Inhisnewstudy,Dr.Boutronfoundtheratiosofthedifferentformsofleadintheleadedgasoline

usedintheUnitedStatesweredifferentfromtheratiosofEuropean,AsianandCanadiangasoline

andthusenabledscientiststodifferentiate(分區(qū))theleadsources.Thedominantleadratiofound

inGreenlandsnowmatchedthatfoundingasolinefromtheUnitedStates.

InastudypublishedinthejournalAmbio,scientistsfoundthatleadlevelsinsoilinthe

North-easternUnitedStateshaddecreasedmarkedlysincetheintroductionofunleadedgasoline.

Manyscientistshadbelievedthattheleadwouldstayinsoilandsnowforalongerperiod.

TheauthorsoftheAmbiostudyexaminedsamplesoftheupperlayersofsoiltakenfromthesame

sitesof30forestfloorsinNewEngland,NewYorkandPennsylvaniain1980andin1990.

Theforestenvironmentprocessedandredistributedtheleadfasterthanthescientistshadexpected.

Scientistssaybothstudiesdemonstratethatcertainpartsoftheecosystem(生態(tài)系統(tǒng))respond

rapidlytoreductionsinatmosphericpollution,butthatthesefindingsshouldnotbeusedasa

licensetopollute.

62.ThestudypublishedinthejournalNatureindicatesthat________.

A)theCleanAirActhasnotproducedthedesiredresults

B)leaddepositsinarcticsnowareontheincrease

C)leadwillstayinsoilandsnowlongerthanexpected

D)theUSisthemajorsourceofleadpollutioninarcticsnow

63.LeadaccumulationworldwidedecreasedsignificantlyaftertheuseofunleadedgasintheUS

________.

A)wasdiscouragedC)wasprohibitedbylaw

B)wasenforcedbylawD)wasintroduced

64.HowdidscientistsdiscoverthesourceofleadpollutioninGreenland?

A)ByanalyzingthedatapublishedinjournalslikeNatureandAmbio.

B)Byobservingtheleadaccumulationsindifferentpartsofthearcticarea.

C)BystudyingthechemicalelementsofsoilandsnowinNortheasternAmerica.

D)Bycomparingthechemicalcompositionsofleadedgasolineusedinvariouscountries.

65.Theauthorsof