CET4大学英语四级考试全真预测第三套.docx

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1、CET4大学英语四级考试全真预测第三套Hi,各位考生大学英语四级考试即将来临，经过一个阶段的备考，你们是否信心满满，胸有成竹；在这里我们网站给大家提供了10全真预测试题，如果你可以在60分钟内完成这些试题，并且准确率达到80%以上；相信顺利过关已不再是梦想；同时大部分练习题后面附有详细的答案详解；如果在做题过程中，发现错误，或者其他不解的地方；请留下您宝贵的意见或建议；我们非常愿意考虑您的所有提议；希望我们可以共同努力，共同进步；1PartIIReadingComprehension(skimmingandScanning)(15minutes)RobotCarstoDoBattleinDes

2、ertRaceWhen15competitorslinedupinNevadalastyearfortheU.S.DefenseDepartment'sfirstmillion-dollarrobotrace,hopeswerehigh.Thechallenge:todriveavehiclewithoutahumandriverorremotecontrolsome150miles(241kilometers)throughtheMojaveDesert.Butthosehopesquicklywentupinacloudofdustasmostrobotsbarelymanaged

3、togetoffthestartingline.Thebestperformer,amodifiedHumveebuiltbyengineersatPennsylvania'sCarnegieMellonUniversity,traveled7miles(11kilometers)beforebreakingdown.Torobotdevotees(热爱者),however,itwasaminorhiccup.Nosurprise,then,that43teamsshoweduptotryoutforthisyear'srace,dubbed(被称作)theGrandChall

4、enge.Forthepastweek,teamsrangingfromgarageenthusiaststowell-fundeduniversityengineershavebeenfine-tuningtheirmachinesatqualifyingroundshereattheCaliforniaSpeedwayinFontana,California.(Watchtherobotsinactioninourexclusivevideo.)Twenty-threefinalistswereannouncedThursdayforSaturday'sGrandChallenge

5、.The175-mile(282-kilometer)coursestartsandfinishesinPrimm,Nevada.Theracepromisestobeeventougherthanlastyear'srun.But18monthsisaneternityintheroboticsworld,andthetechnologyhasvastlyimproved.Organizersbelieveseveralteamshavearealshotoffinishingtheraceinlessthantenhourstoearnthegrandprizeoftwomilli

6、onU.S.dollars.Whenthefirstteamoutofthechute(斜道)Mojavaton,asmallteamoutofColoradomadeitsuccessfullyaroundthe2.2-mile(3.5-kilometer)qualificationcourse,Iknewrightthereandthenthatwehadsomethingspecial,saidRonKurjanowicz,thechiefofstaffforthePentagon'sDefenseAdvancedResearchProjectsAgency(DARPA),whi

7、chissponsoringtherace.UnknownCourseTheaimoftheGrandChallenge,DefenseDepartmentofficialssay,istospurdevelopmentofautonomousgroundvehiclesthatcanoperateindangerousenvironments,suchaswarzones,keepingsoldiersoutofharm'sway.AU.S.Congressmandate(训令)requiresthatone-thirdofmilitarygroundvehiclesdrivethe

8、mselvesby2015,butthetechnologytomeetthatmandatedoesnotyetexist.Sothegovernmentlookedtoenterprisingteamstodevelopthetechnologyfordriverlessvehicles,sweeteningitsofferwiththetwo-million-dollarpurse.Noneofthe23teamsknowswhatliesaheadforthisyear'srace.DARPAwon'trevealtheexactrouteuntiltwohoursbe

9、forethestartoftheraceonSaturday.ButtheobstaclesontheFontanaqualificationcourse-includingasteelenforcedtunnelthatwipesoutavehicle'sglobalpositioningsystemaremadetoresembletherugged,real-lifeconditionsthatthevehicleswillhavetonavigate.Thevehiclesusesensorssuchaslasers,cameras,andradartohelpthemavo

10、idobstaclessuchasrocksandcliffs.Thecomputer'sbrainhastofigureouthowtoresolveunexpectedconflicts,likeabouldersittinginthemiddleoftheroad.ThinkaboutallthedecisionsthatyouandIhavetomakewhenwedrivefromourhousetothestore,Kurjanowiczsaid.Thesevehicleshavetodothesamething,withoutadriver.Amongthetopcont

11、endersinSaturday'sraceisTerraMax,amassivetruckoriginallybuiltbytheWisconsin-basedOshkoshTruckCorporationfortheU.S.Marinecorps.Inlastyear'srace,TerraMaxmanagedtogoonly1.2miles(2kilometers).TeamleaderGarySchmiedelexpectstodomuchbetterthisyear.Hepointedtothenewall-wheelsteeringfeatureonthetruck

12、asanimportantaddition.Wecanmovethislarge,15-ton(13.5-metricton)payloadvehicleinaturnthat'sequivalenttothatofaHumvee,hesaid.GhostriderTheresourcesofteamslikeTerraMaxorCarnegieMellonUniversity,whichhastwovehiclesintheracethisyear,areafarcryfromthoseofsomeoftheothercompetitors,includinginventors,el

13、ectricians,andevenahighschoolteam.Oneentry,fromaSouthernCaliforniateamofengineers,racers,andhot-rodders,iscalledItCameFromtheGarage.Ithasabeerkeg(小桶)stuckonthebackandanon-offswitchthatsaysbrain.Mostoftheschoolsandorganizationswe'reupagainstarejustaccessorizingconventionalvehicles,saidteamleaderC

14、hrisC.J.Pedersen,aformeractor.Ourvehicleisacustom-built,21st-pletewithhoodscoopandexhaustcomingofftheside.AnthonyLevandowski,aroboticsbuilderfromBerkeley,California,isbackwithGhostrider,theonlymotorcyclerobotinthequalifications.Studdedwithsensorsandcomputers,ittoppled(翻倒)overafter3feet(1meter)inlast

15、year'srace.Levandowski,whohadtopostponehisgraduatestudieswhenhecouldn'tfindafacultyadvisorwhobelieveditwouldbepossibletobuildthemotorcyclerobot,sayshisvehiclehassomedistinctadvantages.We'resmallerandgoalotmoreplaces,hesaidwhiletinkeringwiththerobotbeforeanothertrialrun.We'realsoalotl

16、essexpensive.Thisbikecostsasmuchasatireorawheelofsomeoftheseotherguys'machines.SmartMoneyNeitherGhostridernorItCameFromtheGaragemadethefinalcutthisweek'squalifyingraces.However,anothercrowd-pleaser,CajunbotortheRagin'Cajunaconvertedall-terrainvehicledevelopedbyateamfromtheUniversityofLou

17、isianainLafayette,did.ThesmartmoneyinSaturday'sracemaybeonStanley,aconvertedVolkswagenTouaregmadebyateamatCalifornia'sStanfordUniversity.Itwastheonlyvehiclethatdidn'thitanobstacleinthetrialruns.Evenifnoneofthevehiclesfinishestheracethisyear,DARPA'sKurjanowiczsaid,theeventhassucceeded

18、ingalvanizingroboticsdevelopersandpushingthecreationofnewtechnologies.ThebeautyoftheGrandChallengeisthatitdoesn'ttellpeoplehowtosolvetheproblem,hesaid.Thecommunityhascomeupwithitsownelegantsolutions.1.Thepassagemainlydescribestheadvantagesanddisadvantagesofrobotcarraces.2Lastyear'srobotracei

19、nNevadawasagreatsuccess.3Itisasurprisethatupto43teamscameforthisyear'sracecalledtheGrandChallenge.4ThePentagon'sDefenseAdvancedResearchProjectsAgency(DARPA)issponsoringtherace.5TheaimoftheGrandChallengeistospurdevelopmentofautonomousgroundvehicles.6GhostriderandItCameFromtheGaragebothmadethe

20、finalcutatthisweek'squalifyingraces.7TerraMaxwillfinishtheraceandwinthegrandprizeoftwomillionU.S.dollars.8TheobstaclesontheFontanaqualificationcoursearemadetoresemblethe9Theonlymotorcyclerobotinthequalificationsis10Theonlyvehiclethatdidn'thitanobstacleinthetrialrunsis11SectionAQuestions47to5

21、6arebasedonthefollowingpassageAsunflowerisasunflower.Amobilephoneisamobilephone.Butcanyou11thetwotodosomethingforyourlocal12?Itmaywellbepossible.Whenyouhavefinishedwithyourmobilephoneyouwillbeableto13itinthegardenoraplantpotandwaitforittoflower.14,abiodegradable(生物可降解的)mobilephonewasintroducedbyscie

22、ntists.Itishopedthatthenewtypeofphonewillencourage15torecycle.Scientistshavecomeupwithanewmaterialoverthelastfiveyears.Itlookslikeanyother16andcanbehardorsoft.andabletochangeshape.Overtimeitcanalsobreakdownintothesoilwithoutgivingoutanytoxic17.Britishresearchersusedthenewmaterialtodevelopaphonecover

23、thatcontainsasunflowerseed.Whenthisnewtypeofcoverturnsintowaste,it18nitrates(硝酸盐).Thesefeedtheseedandhelptheflowergrow.Engineershavedesignedasmall19windowtoholdtheseed.Theyhavemadesureitonlygrowswhenthephoneisthrownaway.We'veonlyputsunflowerseedsintothecoverssofar.Butweareworkingwithplant20tofin

24、doutwhichflowerswouldperformbest.Maybewecouldputrosesinnexttime,saidonescientist.ARecentlyBconsumersCchemicalsDenvironmentEcombineFtransparentGbuyHcompanionIexpertsJformsKburyLpaperMpaperNplasticOUsually12PassageOneQuestions57to61arebasedonthefollowingpassage.Itisdifficulttoimaginewhatlifewouldbelik

25、ewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebasisforthedecisionswemake,andtherootsofourhabitsandskillsaretobefoundinourpastexperiences,whicharebroughtintothepresentbymemory.Memorycanbedefinedasthecapacitytokeepinformationavailableforlateruse.Itnotonlyincludesrememberingthingslikear

26、ithmeticorhistoricalfacts,butalsoinvolvesanychangeinthewayananimaltypicallybehaves.Memoryisinvolvedwhenaratgivesupeatinggrainbecausehehassniffed(嗅出)somethingsuspiciousinthegrainpile.Memoryexistsnotonlyinhumansandanimalsbutalsoinsomephysicalobjectsandmachines.Computers,forexample,containdevicesforsto

27、ringdataforlateruse.Itisinterestingtocomparethememorystoragecapacityofacomputerwiththatofahumanbeing.Theinstantaccessmemoryofalargecomputermayholdupto100,000wordsstringofalphabeticornumericalcharactersreadyforinstantuse.AnaverageU.S.teenagerprobablyrecognizesthemeaningofabout100,000wordsofEnglish.Ho

28、wever,thisisbutafractionofthetotalamountofinformationthattheteenagerhasstored.Consider,forexample,thenumberoffacesandplacesthattheteenagercanrecognizeonsight.Theuseofwordsisthebasisoftheadvancedproblem-solvingintelligenceofhumanbeings.Alargepartofaperson'smemoryisintermsofwordsandcombinationsofw

29、ords.Butwhilelanguagegreatlyexpandsthenumberandthekingofthingsapersoncanremember,italsorequiresahugememorycapacity.Itmaywellbethiscapacitythatdistinguisheshumans,settingthemapartfromotheranimals.12.WhichofthefollowingisTRUEaboutmemory?AIthelpsusperceivethingshappeningarounduseveryday.BItisbasedonthe

30、decisionswemadeinthepast.CItisrootedinourpasthabitsandskills.DItconnectsourpastexperienceswiththepresent.13Accordingtothepassage,memoryishelpfulinone'slifeinthefollowingaspectsEXCEPTthat_.Aitinvolvesachangeinone'sbehaviorBitkeepsinformationforlateruseCitwarnspeoplenottodothingsrepeatedlyDite

31、nablesonetoremembereventsthathappenedinthepast14Whatistheauthor'sviewaboutcomputersandhumanbeingsintermsofintelligence?AComputershavebettermemorythanachilddoes.BComputersareasintelligentasateenageris.CComputerscanunderstandasmanyas100,000words.DHumanbeingsarefarsuperiortocomputers.15Whatisthemaj

32、orcharacteristicofman'smemorycapacityaccordingtotheauthor?AItcanbeexpandedbylanguage.CItmaykeepalltheinformationinthepast.BItcanrememberallthecombinedwords.DItmaychangewhathasbeenstoredinit.16Humanbeingsmakethemselvesdifferentfromotheranimalsby_.AhavingtheabilitytoperceivedangerBhavingafargreate

33、rmemorycapacityChavingtheabilitytorecognizefacesandplacesonsightDhavingtheabilitytodrawonpastexperiences17PassageTwoQuestions62to66arebasedinthefollowingpassage.Familyisofcourseanelasticword.ButwhenBritishpeoplesaythattheirsocietyisbasedonfamilylife,theyarethinkingoffamilyinitsnarrow,peculiarlyEurop

34、eansenseofmother,fatherandchildrenlivingtogetheraloneintheirownhouseasaneconomicandsocialunit.Thus,everyBritishmarriageindicatesthebeginningofanewandindependentfamilyhencethetremendousimportanceofmarriageinBritishlife.Forboththemanandthewoman,marriagemeansleavingone'sparentsandstartingone'so

35、wnlife.Theman'sfirstdutywillthenbetohiswife,andthewife'stoherhusband.Hewillbeentirelyresponsibleforherfinancialsupport,andshefortherunningofthenewhome.Theirchildrenwillbetheircommonresponsibilityandtheirsalone.Neitherthewife'sparentsnorthehusband's,northeirbrothersorsisters,auntsorun

36、cles,haveanyrighttointerferewiththemtheyaretheirownmasters.ReadersofnovelslikeJaneAusten'sPrideandPrejudicewillknowthatinformertimesmarriageamongwealthyfamilieswasarrangedbythegirl'sparents,thatis,itwastheparents'dutytofindasuitablehusbandfortheirdaughter,preferablyarichone,andbyskillful

37、encouragementtoleadhimeventuallytoasktheirpermissiontomarryher.Untilthattime,thegirlwasprotectedandmaintainedintheparents'home,andthefinancialreliefofgettingridofhercouldbeseenintheirgivingthenewlymarriedpairasumofmoneycalledadowry(嫁妆).Itisverydifferenttoday.Mostgirlsoftodaygetajobwhentheyleaves

38、choolandbecomefinanciallyindependentbeforetheirmarriage.Thishashadtworesults:agirlchoosesherownhusband,andshegetsnodowry.17.Whatdoestheauthormeanby'Family'isofcourseanelasticword?ADifferentfamilieshavedifferentwaysoflife.BDifferentdefinitionscouldbegiventotheword.CDifferentnationshavediffere

39、ntfamilies.DDifferenttimesproducedifferentfamilies.18ForanEnglishfamily,thehusband'sdutyis_.AsupportingthefamilywhilethewifeisfinancialBdefendingthefamilywhilethewifeisrunningthehomeCfinancialwhilethewifeisrunningthehomeDindependentwhilethewifeisdependent19Everythingisdecidedinafamily_.Abythecou

40、pleCbybrothersandsistersBwiththehelpoftheirparentsDwiththehelpofauntsanduncles20WhatisTRUEconcerningthebookPrideandPrejudice?AItisthebestbookonmarriage.BItisahandbookofmarriage.CItgivesquitesomeideasofEnglishsociallifeinthepast.DItprovidesalotofinformationofformertimewealthyfamilies.21Withregardtoma

41、rriageinBritain,presentdaygirlsdifferfromformertimegirlsin_.AtherighttomarryCchoosinghusbandsBmoreparentalsupportDsocialposition22PartVCloze(15minutes)Anadultgiraffe'sheadisaboutsixfeetaboveitsheart.Thismeansthatto-_22_enoughblooduptothebrainthecirculatory_23_mustbestrongenoughtokeepthebloodatve

42、ryhighpressure.Bthatgiraffessolvethisproblembyhaving_24_highbloodpressure,about_25_thatofhumanbeings.Butaninternationalteamofbiologistsbeganto_26_aboutthis.Ifgiraffeshavesuchhighbloodpressure,theyshouldhavea_27_problemwithswellingintheirlegsandfeet.Whydon'tgiraffeshaveswollenfeet?Giraffesshouldh

43、ave_28_problem,too.Everytimetheybendheads_29_todrink,thebloodshould_30_totheirheadsandhaveahardtime_31_backup(whentheheadisdown)totheheart.Howcomegiraffesdon'tblackoutwhentheydrink?Theanswertothe_32_feetproblem,theresearchersfound,isthatgiraffeshave_33_theresearcherscallanaturalanti-gravitysuit.

44、It_34_outthattheskinandother_35_intheirlegsandfeetare_36_stifferandtougherthanthoseofother_37_.Asaresult,thebloodvesselsinthelegcannotswell.Therefore,thebloodhasnowheretogobutbacktotheheart.Whataboutbloodrushingtothehead_38_thegiraffebendsdowntodrink?Theresearchersfoundthatthegiraffe'sjugularvei

45、n,which_39_bloodfromtheheadbacktotheheart,haslotsofone-wayvalvesinit.Inthegiraffe'sneck,therearelotsofmusclesthatflexandrelaxrepeatedlyastheanimalmovesitsheadandsucks_40_drinkingwater.Bysqueezingthevalvedjugularvein,they_41_bloodmovingbacktotheheartevenwhiletheanimalisdrinking.22.AbringBproduceC

46、transferDpump23()AstructureBsystemCfunctionDorganism24()AunusuallyBgenerallyCuncomfortablyDcommonly25()AhalfBmultipleCdoubleDpair26()AinvestigateBwonderCundertakeDlearn27()AterribleBunreliableCunsolvableDadvisable28()AotherBsomeCothersDanother29()AupBdownCtowardDaside30()AcrushBbrushCpushDrush31()Af

47、ollowingBreturningCplowingDpouring32()AhealthyBswollenCdrearyDradical33()AwhatBwhereCthatDthose34()ArevealsBindicatesCfiguresDturns35()AtissuesBvesselsCporesDorgans36()AmanyBveryCmuchDless37()AgiraffesBanimalsCpeopleDcreatures38()AwheneverBwhateverChoweverDwherever39()AreflectsBreleasesCreceivesDcarries40()AinBupCtoDfrom41()ApermitBpreventCretainDkeep42PartVITranslation(5minutes)