大学英语考试四级最新模拟试题二Word文件下载.docx
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大学英语考试四级最新模拟试题二Word文件下载.docx
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Howdoyousendamessagetoasubmergedsubmarine,particularlyonecarryingmiWatermaynotlooklikeabarriertocommunications,butappearancesaredeceiving.Waterstronglyabsorbsallelectromagneticwavesexceptbluegreenlightandextremelylowfrequencyradiowaves.Theverylowfrequencywavesnowusedtocontractsubmarinespenetratesonlyashortdistanceintotheocean,sothecraftmusteithersurfaceorsendupandantenna(天线)toreceivemessages,therebyincreasingitsweakness.Alasersystem---accurateoverlongdistancesandcapableofcarryingmoredatathantheverylowfrequencywaves---wouldtalktosubmarineattheirnormaldepths.
Inthesystem,averybroadbeamspreadingoutfreelyinalldirectionswouldbescanned(扫描)overthousandsofsquaremilesofoceansothatitwouldn'
tendangerboats,birdsorfish——orthesubmarinesitissupposedtoreach.
Sinceonlyasmallfractionofthelasersystemwillmakeitswaythroughtheairandocean,receiversmountedonthesubmarinesmustbeablenotonlytodetectthelaserbutalsotodiscriminatebetweenitandsunlight.So,militaryscientistsarenowworkinghardonspecialfilterthatallowthroughonlytheprecisewavelengthsemittedbythelaser.Thefilteredlight,whentransformedintoelectricalsignal,canthenbedecoded.Militaryplannersareconfidentthatlasercommunicationwithsubmarinesisfeasible.
1.Whichofthefollowingdoesthepassagemainlydiscuss?
A.Missilescarriedbysubmergedsubmarines.B.Messagessentbysubmergedsubmarines.C.Blue-greenlasersusedbysubmergedsubmarines.D.Thewaytosendamessagetosubmergedsubmarines.
2.WhichofthefollowingisTRUEaccordingtothepassage?
A.Waterisabarriertoradiocommunication.B.Lasershavefoundwideapplicationinsubmarinecommunication.C.Waterabsorbsallkindsofelectromagneticwaves.D.Verylowfrequencyradiowavescannotbeusedtocontactsubmarines.
3.WhichofthefollowingisNOTtrueofalasersystem?
A.Itisabletomakeitswaythroughwater.B.Itisabletocommunicatewithsubmarinesatwork.C.Itsbeamreachesasubmergedsubmarinewiththehelpofanantenna.D.Itisabletocarrymoredatathanlowfrequencywaves.
4.Thereferenceword“it”(Sentence1,para.3)refersto.
A.theairB.thelaserbeamC.theoceanD.thesubmarine
5.Whowouldbeverymuchinterestedinthepassage?
A.MissilebuildersB.MilitaryscientistsC.FishermenD.Shipbuilder
Passage2
TheWestbeguntotakemorenoticeoftheEast.Thefifthvolumeofanenormousworkre-assessingtheChinesecontributiontoscienceandtechnologyistobepublishednextyear.Thefirstvolume,whichwaspublishedtwentyyearsago,setthetoneforthewholework.Init,evidencewasgiventoshowthatmanyinventionswhich,untilthen,westernhistorianshadclaimedforEurope,weremadefirstinChina.Theattempttorewritetheintellectualhistoryoftheworldwasnotreceivedwithoutprotestbysomereputablehistorians.However,theevidencethathasbeenpresentedsofarinthefirstfourvolumeshaspersuadedmanyhistorianswhowereskepticalatfirst.China'
sinventionofpaper,printing,themagneticcompassandgunpowderhasneverbeendisputed,butthisnewhistoryhasaddedadvancedbridgedesign,mechanicalclocks,paddleboatsandmanyotherinventionstothelist.
InthefourvolumespublishedsofarnoattempthasbeenmadetoexplainwhyChinahasnotkeptupwiththeWestinscienceandtechnologyinmoderntimes.ItisprobablethattheansweristobefoundinthesocialandeconomichistoryofChina,whereastaticsocietyunderarelativelybenevolentregimeofscholar-gentrycontrastswiththepotentiallyrevolutionaryanddynamicsocietyoftheWestattheendoftheMiddleAges.Inrecentyears,theChinesegovernmenthasbeenmakingeveryefforttocatchupwiththeWestagain,andthereislittledoubtthatthegapisbeingreducedyearbyyear.ButwillChinaavoidtheWest'
smistakes?
6.Sofar,howmanyvolumeshavebeenpublished?
A.Five.B.Four.C.Three.D.None.
7.Thefirstvolumewaspublished.
A.tenyearsagoB.lastyearC.fiveyearsagoD.twentyyearsago
8.InLine7,theword“skeptical"
means.
A.doubtfulB.worriedC.sadD.angry
9.Whichofthefollowingisnotmentionedinthepassage?
A.Gunpowder.B.Needle.C.Paddleboats.D.Bridgedesign.
10.Thebesttitleforthispassageis.
A.China'
sInventionsB.ComparisonsBetweentheEastandtheWestC.ChinaIsCatchingUpD.SituationsinChina
Passage3
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebuildingofhugeindustrialcomplexesfortherecyclingofwaste.Thewordrubbishcouldloseitsmeaningbecauseeverythingwhichgoesintothedustbinwouldbemadeintosomethinguseful.Eventhemostdangerousandunpleasantwasteswouldprovideenergyifnothingelse.
ThenewconceptofrecyclingwasteistakingshapeattheBritishtechnologicallaboratoryatWarrenSpring,notfarfromthenorthofLondon.Today,thelaboratoryspendsfourtimesasmuchmoneyinstudyingrecyclingasitdidfiveyearsago.
Thelatestprojectistotakeacityofaroundhalfamillioninhabitantsanddiscoverexactlywhatrawmaterialsgointoitandwhatgoout.Theaimistofindouthowmuchoftheserawmaterialscouldbeprovidedifaplantforrecyclingwastewerebuiltjustoutsidethecity.Thisplantwouldrecyclenotonlymetalsuchassteel,leadandcopper,butalsopaperandrubberaswell.Methodshavebeendiscovered,forexample,forremovingtheinkfromnewsprintsothatthepapercanbeusedagain,andforobtainingvaluableoilsandgasesfromoldmotorcartypes.Alltheseideasarealreadybeingmadeuseof,butwhatisnewistheideaofcombiningthemonsuchalargescaleinasingleplantdesignedtorecyclemosttypesofwaste.
Anothernewprojectisbeingsetuptodiscoverthebestwaysofsortingandseparatingtherubbish.Whenthisprojectiscomplete,therubbishwillbeprocessedlikethis:
first,itwillpassthroughsharpmetalspikeswhichwilltearopentheplasticbagsinwhichrubbishisusuallypacked;
thenitwillpassthroughapowerfulfantoseparatethelightestelementsfromtheheavysolids;
afterthatcrushersandrollerswillbreakupeverythingthatcanbebrokenfinally,andtherubbishwillpassundermagnets,whichwillremovethebitsofironandsteel;
finelytherubberandplasticwillthenbesortedoutinthefinalstage.
Thefirstfull-scalegiantrecyclingplantsare,perhaps,fifteenyearsaway.Butinsomebigindustrialareas,whererubbishhasbeendumpedforsolongthattherearenoholeslefttofillupwithrubbish,thesenewautomaticrecyclingplantsmaybebuiltsooner.Indeed,withthegrowingcostoftransportingrubbishtomoredistantdumps,somebigcitieswillbeforcedtobuildtheirownrecyclingplantsbeforelong.
11.ProjectsforrecyclingwasteinBritain.
A.willnotbestartedforatleastfifteenyearsB.arebeingdevelopedalloverBritainC.havenotyetbeenfullytestedD.havebeenabandonedbecausetheyaretooexpensive
12.Thepurposeofthelatestrecyclingprojectis
A.topreventpeoplefromputtingrubbishintoholesB.tofindawayofdestroyingallkindsofwasteC.toextractusefulrawmaterialsfromthewasteD.tofindouthowmuchrawmaterialsshouldbeprovidedofpeoplewanttorecyclethewaste
13.Thenewtypeofrecyclingplantwill.
A.recycleonlypaperandrubberB.notrecyclemetals,paperorrubberC.recyclepaper,rubberandmetalsD.notrecyclesteel,leadorcopper
14.Thefirstrecyclingplants.
A.havealreadybeenbuiltinlargeindustrialareasB.willnotbebuiltforatleastfifteenyearsC.willprobablybebuiltinthenextfifteenyearsD.willbetooexpensivetobuildnearbigcities.
15.“Wellonwith"
inthefirstparagraphprobablymeans.
A.finishedwithB.nearingcompletionC.gettingreadytostartD.makingimprovementson
Passage4
Peoplewithdisabilitiescomprisealargepartofthepopulation.Itisestimatedthatover35millionAmericanshavephysical,mental,orotherdisabilities.Abouthalfofthesedisabilitiesare“developmental"
i.e.,theyoccurpriortotheindividual'
stwenty-secondbirthday,oftenfromgeneticconditions,andaresevereenoughtoaffectthreeormoreareasofdevelopment,suchasmobility,communication,employment,etc.Mostotherdisabilitiesareconsidered“adventitious"
i.e.,accidentalorcausedbyoutsideforces.
Priortothe20thcentury,onlyasmallpercentageofpeoplewithdisabilitiessurvivedforlong.Medicaltreatmentforthesedisabilitieswasunavailable.Advancementsinmedicineandsocialserviceshavecreatedaclimateinwhichpeoplewithdisabilitiescanexpecttohavesuchbasicneedsasfood,shelter,andmedicaltreatment.Unfortunately,thesebasicsareoftennotavailable.Civillibertiessuchastherighttovote,marry,getaneducation,andgainemploymenthavehistoricallybeendeniedonthebasisofdisability.
Inrecentdecades,thedisabilityrightsmovementhasbeenorganizedtofightagainsttheseinfringementsofcivilrights.Congressrespondedbypassingmajorlegislationrecognizingpeoplewithdisabilitiesasaprotectedclassundercivilrightsstatutes.
Stilltoday,peoplewithdisabilitiesmustfighttolivetheirlivesindependently.ItisestimatedthatmorethanhalfofqualifiedAmericanswithdisabilitiesareunem
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