大学英语四六级考试模拟大学英语四级模拟六

大学英语四级模拟试题（六）directions:therearefourreadingpassagesinthispart.eachpassageisfollowedbysomequestions.foreachquestiontherearefoursuggestedanswersmarkeda,b,candd.youshouldchoosetheonebestanswerandblackenthecorrespondingletterontheanswersheetwithapencil. childrenarearelativelymoderninvention.untilafewhundredyearsagotheylooklikeadult,wearinggrown-upclothesandgrown-upexpressions,performinggrown-uptasks.childrendidnotexistbecausethefamilyasweknowithadnotevolved.childrentodaynotonlyexist;theyhavetakenover,innoplacemorethaninamerica,andatontimemorethannow.itisalwayskidscountryhere.ourcivilizationischild-centered,child-obsessed.akidsbodyisourphysicalideal.inkidscountrywedonotpermitmiddle-aged.thirtyispromotedover50,but30knowsthatsoonhistimetobeovertakenwillcome.wearethefirstsocietyinwhichparentsexpecttolearnfromtheirchildren.suchatopsy-turvysituationhascometoabortatleastinpartbecause,unliketherestoftheworld,oursisanimmigrantsociety,heoldcountry,thatis,europe,hopewasinthefather,hegrowthpatternofamericaanditsever-expandingfrontier,theyoungmanwaseveradvisedtogowest;thefatherwaseverinheritingfromhisson.kidscountrymaybetheinevitableresult.kidscountryisnotallbad.americaisthegreatestcountryintheworldtogrowupinbecauseitiskidscountry.wenotonlywearkidsclothesandeatkidsfood;wedreamkidsdreamsandmakethemcometrue.itwas,afterall,aboysgametogotothemoon.ifintheolddayschildrendidnotexist,itseemsequallytruetodaythatadults,asaclass,havebeguntodisappear,condemningallofustoremainboysandgirlsforever,jogginganddoingpush-upsagainsteternity.21.theauthorusestheexampleoftherenaissancepaintingtoshowthat.a.adultsshowedlessconcernforchildrenthanwedonowb.adultsweresmallerandthinneratthattime,hethirdparagraph,“theoldcountryiscontrastedwithamerica.a.toshowdifferencesinfamilysizeb.toshowdifferencesinattitudestowardsfamilyrelationsc.toshowtwokindsofgeographyd.toshowtwodifferentkindsofeconomicrelationsbetweengenerations23.goingtothemoonisanexampleof.a.americasdreamsandcreativityb.americaschildishandqueerbehaviorc.whyamericahasntgrownupd.whyamericaisconsideredasthegreatestcountryintheworld24.accordingtothepassage,whichofthefollowingistrue?a.itisverydifficultforthemiddle-agedtoliveinamericab.americaiskidscountrybecausethemajorityoftheamericanpopulationarechildrenc.kidscountrywastakingshapeinamericawhenimmigrantspouredintothecountry.d.americaismoreofkidscountrythananyothercountriesintheworld25.bysaying“condemningallofustoremainboysandgirlsforever,jogginganddoingpush-upsagainsteternity,theauthormeansthat.a.shethinkspeopleshouldntbesoconcernedaboutphysicalfitnessb.shefeelstoooldandtiredtodosuchhardexercisec.americansocietyisoveremphasizingyouthandphysicalappearanced.whathappenedtochildrencenturiesagomayoccurtoadultsinamericasoonpassage2themodernageisanageofelectricity.peoplearesousedtoelectriclights,radios,televisions,andtelephonesthatitishardtoimaginewhatlifewouldbelikewithoutthem.whenthereisapowerfailure,peoplegropeaboutinflickeringcandlelight,carshesitateinthestreetsbecausetherearenotrafficlightstoguidethem,andfoodspoilsinsilentrefrigerators.yetpeoplebegantounderstandhowelectricityworksonlyalittlemorethantwocenturiesago.naturehasapparentlybeenexperimentinginthisfieldformillionsofyears.scientistsarediscoveringmoreandmorethatthelivingworldmayholdmanyinterestingsecretsofelectricitythatcouldbenefithumanity.alllivingcellssentouttinypulsesofelectricity.astheheartbeats,itsendsoutpulsesthatcanbemeasuredandrecordedonthesurfaceofthebody.whenthepulsesarerecorded,theyformanelectrocardiogram,whichadoctorcanstudytodeterminehowwelltheheartisworking.thebrain,too,sendsoutbrainwavesofelectricity,whichcanberecordedinanelectroencephalogram,theelectriccurrentsgeneratedbymostlivingcellsareextremelysmall-oftensosmallthatsensitiveinstrumentsareneededtorecordthem.butinsomeanimals,certainmuscledcellshavebecomesospecializedaselectricalgeneratorsthattheydonotworkasmusclecellsatall.whenlargenumbersofthesecellsarelinkedtogether,theeffectcanbeastonishing.theelectriceelisanamazinglivingstoragebattery.itcansendajoltofasmuchaseighthundredvoltsofelectricitythroughthewaterinwhichitlives.(anelectrichousecurrentisonlyonehundredtwentyvolts.)asmanyasfour-fifthsofallthecellsintheelectriceelsbodyarespecializedforgeneratingelectricity,andthestrengthoftheshockitcandelivercorrespondsroughlytothelengthofitsbody.26.whatisthemainideaofthepassage?a.electriceelsarepotentiallydangerous.b.biologyandelectricityappeartobecloselyrelated.c.peoplewouldbeatalosswithoutelectricity.d.scientistsstillhavemuchtodiscoveraboutelectricity.27.theauthormentionsallofthefollowingasresultsofablackoutexcept.a.refrigeratedfooditemmaygobadb.trafficlightsdonotworkc.peoplemustrelyoncandlelightd.elevatorsandescalatorsdonotfunction28.whydoestheauthormentionelectriceels?a.towarnthereadertostayawayfromthem.b.tocomparetheirvoltagetothatusedinhouses.c.togiveanexampleofalivingelectricalgenerator.d.todescribeanewsourceofelectricalpower.29.howmanyvoltsofelectricitycananelectriceelemit?a.1,000.b.800.c.200.d.0.30.itcanbeinferredfromthepassagethatthelongeraneelisthe.a.morebeneficialitwillbetoscienceb.morepowerfulwillbeitselectricalchargec.easieritwillbetofindd.tougheritwillbetoeatpassage3americanscientistshavedevelopedanewkindofwirethatcancarrytelephonemessagesforlongdistances.thenewfluorideglasswire,oropticalfibre,isamajorimprovementovertheopticalfibresnowusedinmanymoderncommunicationsystems.presentopticalfibresaremadefromsilicaglass.theyarenotcostlytoproduce,butthesignalscarriedbythesesilicaopticalfibresweakenveryquickly.arepeaterdevicemustbebuiltevery50kilometerstoincreaseoramplifythesignalsstrength.suchrepeaterdevicesarecostlyandtheyneedelectricalpower.thiscreatesspecialproblemsforopticalfibresystemsthatcrossoceans.longcopperwiresareneededtocarryelectricityfromshoretorepeaterdevicesundertheocean.repairingtheunderwaterrepeatersiscostlyandtakesmuchtime.thenewfluorideopticalfibreisonlyalittlebiggeraroundthanahumanhair,yeteachcouldcarry,000telephonemessagesatonetimeforthousandsofkilometers.traditionalcoppertelephonewirescancarryonly4messages.andunlikepresentsilicaopticalfibres,thenewfluorideglasswirescouldcarrymessagesforthousandsofkilometerswithveryfew,ifany,repeaterdevices.thenavyscientistsdevelopedthenewopticalfibresforsystemsthatcrossoceans,buttheysaidtherealsowouldbemanyotherusesforthefluorideglasswires.thenewopticalwirescouldbeusedforlong-distancetemperaturesensingdevices.theycouldbeusedinsomemedicaloperations.scientistscautionthatthenewfluorideopticalfibrestillisonlyexperiment.researchershavenotyetbeenabletomakelongtinywiresfromfluorideglass.31.whichofthefollowingstatementsisnottrue?a.silicaopticalfibresarenotexpensivetoproduce.b.signalscarriedbysilicaopticalfibresareratherweak.c.additionaldevicesareneededforpresentopticalfibre/fibersystems.d.repeatersbringaboutspecialproblemsfortransoceaniccommunications.32.themajoradvantageoffluorideopticalfibres/fibersoversilicawiresisthatfluorideglass.a.needsmuchfewer,ifany,municationssystemsthatcrossoceansb.long-distancetemperaturesensingdevicesc.somemedicaloperationsd.replacingsilicaopticalfibres34.thefluorideopticalfibresisexperimentalbecausethenewglasswiremadesofor.a.isquiteexpensiveb.cannotyetcarryenormousmessagesc.stillneedsrepeatersd.isnotlongenough35.theauthorsmainideaisthat.a.presentopticalfibresaremadefromsilicaglassb.silicaopticalfibresneedrepeaterstoamplifythesignalscarriedc.americanscientistshavedevelopedanewglasswiretocarrylong-distancetelephonemessagesd.thenewopticalfiberhadmanyusespassage4thereisnodoubtthatadults,andevenhighlyeducatedadults,varygreatlyinthespeedandefficiencyoftheirreading.someproceedveryslowlythroughout;othersdashalongtooquicklyandthenhavetoregress.poorreadersinparticularmaylacktheabilitytovarytheirmannerofreadingaccordingtothetypeofreadingmatterandtotheirintentionsinreadingit.agoodreadercanmoveatgreatspeedthroughthetextofanovelorsimilarlightreadingmatter.hemaybeabletoskimapage,pickingupawordortwohereandthere,andgainageneralideaofwhatthetextisaboutwithoutreallyreadingit.inreadingmoredifficultmaterial,withtheintentionoftakinginthewholeofit,hewillproceedmoreslowly,buteventhenhewillvaryhispace,concentratingonthekeywordsandpassages,perhapsre-readingthemseveraltimesandpassmorequicklyovertheremainder.alessefficientreadertendstomaintainthesamespeedwhateverthematerialhereads.consequently,evenlightreadingmattergiveshimlittlepleasurebecausehereadssoslowly.butthispacemaybetoofastforreallydifficultmaterialwhichrequiresspecialconcentrationatdifficultpoints.atypeofreadingwhichnecessitatescarefulattentiontodetailisproofreading,inwhichthereader,inordertodetectmisprintsinasampleprint,hastonoticenotsomuchthemeaningofwhathereadsastheexactshapeandorderoflettersandwordsinthetext.thisisextremelydifficultformostpeople,sincetheyareaccustomedtooverlookingsuchdetails.infact,considerablepracticeisrequiredtopractisethistaskefficientlyanditcanbedoneonlybereadingveryslowly,andbypayingcomparativelylittleattentiontothegeneralmeaningofthetext.36.theauthorclaimsthatthereisadifferenceinreadingspeed.a.amongreaderswhohavedifferentexperience.b.amongallthereaders.c.betweenthepoorlyeducatedandthehighlyeducated.d.amongthehighlyeducatedpeople37.agoodreaderisareaderwho.a.concentratesonthewonderfulpartofthearticleb.alwaysreadsslowlyandcarefullyc.changeshisspeedaccordingtothekindoftextd.changeshisspeedaccordingtotheinterestingofthetext.38.theauthorsaysthatwhenreadinganovel,agoodreadercanquicklyread.a.everypartofthebookb.themostwonderfulpartinthebook.c.themajorpartinthebookd.thescientificpartofthebook.39.thelasttwosentencesofthefirstparagraphmeanthat.a.areadingspeedtooslowforadifficultbookisjustrightforanon-seriousone.b.areadingspeedtooslowforanon-seriousbookmaybetoofastforadifficultone.c.areadingspeedtoofastfordifficultmaterialisjustrightforanon-seriousbookisalsotooslowforadifficultone.d.areadingspeedtooslowforanon-seriousbookisalsotooslowforadifficultone.40.whichofthefollowingcanbethetitleofthepassage?a.readingandlisteningb.differencebetweenhighly-educatedandpoorlyeducatedc.practicereadingskilld.differenceinthespeedandefficiencyofreadingpartiiivocabularyandstructure(20minutes)directions:thereare30incompletesentencesinthispart.foreachsentencetherearefourchoicesmarkeda.,b.,c.andd.choosetheoneanswerthatbestcompletesthesentence.thenmarkthecorrespondingletterontheanswersheetwithasinglelinethroughthecentre.41.wereleavingatsixoclockinthemorning,andhopetomostofthejourneybylunchtime.a.bedoingb.havedonec.havebeendoned.do42.itocallonyou,butwaspreventedfromdoingso.a.meanb.havemeantc.meantd.hadmeant43.mybrothercoulddonothingelsethanbooks.a.toreadb.havingreadc.readd.reading44.ihavenoobjectiontheeveningwiththem.a.tospendb.spendingc.ofspendingd.tospending45.thedentistsaidthatmytoothwentworseandiitpulledout.a.shouldhavehadb.mighthavehadc.neednthavehadd.mustnthavehad46.hedidntgointodetailonthesubject;hespoke.a.incommonb.inshortc.ingenerald.inparticular47.heisoneofthesemenwho,iamsure,alwaysdobesteveninmosttryingcircumstances.a.themb.hisc.theird.ones48.wouldyoumindtheairconditioner?a.toturnonb.turningonc.beingturnedond.turnedon49.wedidntknowhisaddress;otherwiseweaninvitationtohim.a.wouldhavesentb.musthavesentc.hadsentd.wouldsend50.hiscarelessness,hefailedtheexam.a.inspiteofb.regardlessofc.onaccountofd.incaseof51.johnsscoreonthetestisthehighestintheclass;hatwayd.innoway53.manycountriesfacesomeseriousproblemsoflanduse,ruthd.infull55.itwouldhavebeenjustassatisfactoryifiathome.ilearnednothinginclass.a.hadstayedb.stayedc.wasstayingd.wouldstay56.hewasntaskedtotakeonthechairmanshipofthesociety,insufficientlypopularwithallmembers.a.beingconsideredb.consideringc.tobeconsideredd.havingconsidered57.thechildscloselyresemblethoseofitsbrother.a.featureb.featuresc.futured.figure58.thevisitorwasentranc