大学英语四级模拟试题7.docx
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大学英语四级模拟试题7.docx
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大学英语四级模拟试题7
大学英语四级模拟试题(7)
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Directions:
Therearefourreadingpassagesinthispart.Eachpassageisfollowedbysomequestions.ForeachquestiontherearefoursuggestedanswersmarkedA,B,CandD.YoushouldchoosetheonebestanswerandblackenthecorrespondingletterontheANSWERSHEETwithapencil.
Childrenarearelativelymoderninvention.Untilafewhundredyearsagothey
looklikeadult,wearinggrown-upclothesandgrown-upexpressions,performinggrown-uptasks.Childrendidnotexistbecausethefamilyasweknowithadnotevolved.
Childrentodaynotonlyexist;theyhavetakenover,innoplacemorethaninAmerica,andatontimemorethannow.ItisalwaysKids'Countryhere.Ourcivilizationischild-centered,child-obsessed.Akid'sbodyisourphysicalideal.InKids'Countrywedonotpermitmiddle-aged.Thirtyispromotedover50,but30knowsthatsoonhistimetobeovertakenwillcome.
Wearethefirstsocietyinwhichparentsexpecttolearnfromtheirchildren.Suchatopsy-turvysituationhascometoabortatleastinpartbecause,unliketherestoftheworld,oursisanimmigrantsociety,andforimmigrantstheonlyhopeisinthekids.IntheOldCountry,thatis,Europe,hopewasinthefather,andhowmuchwealthhecouldaccumulateandpassalongtohischildren.InthegrowthpatternofAmericaanditsever-expandingfrontier,theyoungmanwaseveradvisedtoGOWEST;thefatherwaseverinheritingfromhisson.Kid'sCountrymaybetheinevitableresult.
Kid'sCountryisnotallbad.AmericaisthegreatestcountryintheworldtogrowupinbecauseitisKid'sCountry.Wenotonlywearkids'clothesandeatkids'food;wedreamkids'dreamsandmakethemcometrue.Itwas,afterall,aboys'gametogotothemoon.
Ifintheolddayschildrendidnotexist,itseemsequallytruetodaythatadults,asaclass,havebeguntodisappear,condemningallofustoremainboysandgirlsforever,jogginganddoingpush-upsagainsteternity.
21.TheauthorusestheexampleoftheRenaissancepaintingtoshowthat.
A.adultsshowedlessconcernforchildrenthanwedonow
B.adultsweresmallerandthinneratthattime,buttheystillhadlotsofworktodo
C.childrenlookedandactedlikeadultsatthattime
D.childrenwerenotpermittedtoappearinfamilypaintingsatthattime
22.Inthethirdparagraph,“theOldCountry"iscontrastedwithAmerica.
A.toshowdifferencesinfamilysize
B.toshowdifferencesinattitudestowardsfamilyrelations
C.toshowtwokindsofgeography
D.toshowtwodifferentkindsofeconomicrelationsbetweengenerations
23.Goingtothemoonisanexampleof.
A.America'sdreamsandcreativity
B.America'schildishandqueerbehavior
C.WhyAmericahasn'tgrownup
D.WhyAmericaisconsideredasthegreatestcountryintheworld
24.Accordingtothepassage,whichofthefollowingistrue?
A.Itisverydifficultforthemiddle-agedtoliveinAmerica
B.AmericaisKid'sCountrybecausethemajorityoftheAmericanpopulationarechildren
C.Kid'sCountrywastakingshapeinAmericawhenimmigrantspouredintothecountry.
D.AmericaismoreofKid'sCountrythananyothercountriesintheworld
25.Bysaying“condemningallofustoremainboysandgirlsforever,jogginganddoingpush-upsagainsteternity",theauthormeansthat.
A.shethinkspeopleshouldn'tbesoconcernedaboutphysicalfitness
B.shefeelstoooldandtiredtodosuchhardexercise
C.Americansocietyisoveremphasizingyouthandphysicalappearance
D.WhathappenedtochildrencenturiesagomayoccurtoadultsinAmericasoon
Passage2
Themodernageisanageofelectricity.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-fifthsofallthecellsintheelectriceel'sbodyarespecializedforgeneratingelectricity,andthestrengthoftheshockitcandelivercorrespondsroughlytothelengthofitsbody.
26.Whatisthemainideaofthepassage?
A.Electriceelsarepotentiallydangerous.
B.Biologyandelectricityappeartobecloselyrelated.
C.Peoplewouldbeatalosswithoutelectricity.
D.Scientistsstillhavemuchtodiscoveraboutelectricity.
27.TheauthormentionsallofthefollowingasresultsofablackoutEXCEPT.
A.refrigeratedfooditemmaygobad
B.trafficlightsdonotwork
C.peoplemustrelyoncandlelight
D.elevatorsandescalatorsdonotfunction
28.Whydoestheauthormentionelectriceels?
A.Towarnthereadertostayawayfromthem.
B.Tocomparetheirvoltagetothatusedinhouses.
C.Togiveanexampleofalivingelectricalgenerator.
D.Todescribeanewsourceofelectricalpower.
29.Howmanyvoltsofelectricitycananelectriceelemit?
A.1,000.
B.800.
C.200.
D.120.
30.Itcanbeinferredfromthepassagethatthelongeraneelisthe.
A.morebeneficialitwillbetoscience
B.morepowerfulwillbeitselectricalcharge
C.easieritwillbetofind
D.tougheritwillbetoeat
Passage3
AmericanScientistshavedevelopedanewkindofwirethatcancarrytelephonemessagesforlongdistances.Thenewfluorideglasswire,oropticalfibre,isamajorimprovementovertheopticalfibresnowusedinmanymoderncommunicationsystems.
Presentopticalfibresaremadefromsilicaglass.Theyarenotcostlytoproduce,butthesignalscarriedbythesesilicaopticalfibresweakenveryquickly.Arepeaterdevicemustbebuiltevery50kilometerstoincreaseoramplifythesignals'strength.Suchrepeaterdevicesarecostlyandtheyneedelectricalpower.Thiscreatesspecialproblemsforopticalfibresystemsthatcrossoceans.Longcopperwiresareneededtocarryelectricityfromshoretorepeaterdevicesundertheocean.Repairingtheunderwaterrepeatersiscostlyandtakesmuchtime.
Thenewfluorideopticalfibreisonlyalittlebiggeraroundthanahumanhair,yeteachcouldcarry10,000telephonemessagesatonetimeforthousandsofkilometers.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,repeaters
B.carriesmoretelephonemessages
C.islesscostlytoproduce
D.istinier
33.Thenewglasswirewasdesignedfor.
A.communicationssystemsthatcrossoceans
B.long-distancetemperaturesensingdevices
C.somemedicaloperations
D.replacingsilicaopticalfibres
34.Thefluorideopticalfibresisexperimentalbecausethenewglasswiremadesofor.
A.isquiteexpensive
B.cannotyetcarryenormousmessages
C.stillneedsrepeaters
D.isnotlongenough
35.Theauthor'smainideaisthat.
A.presentopticalfibresaremadefromsilicaglass
B.silicaopticalfibresneedrepeaterstoamplifythesignalscarried
C.Americanscientistshavedevelopedanewglasswiretocarrylong-distancetelephonemessages
D.thenewopticalfiberhadmanyuses
Passage4
Thereisnodoubtthatadults,andevenhighlyeducatedadults,varygreatlyinthespeedandefficiencyoftheirreading.Someproceedveryslowlythroughout;othersdashalongtooquicklyandthenhavetoregress.Poorreadersinparticularmaylacktheabilitytovarytheirmannerofreadingaccordingtothe
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