2010年6月大学英语四级真题Questions47to56arebasedonthefollowingpassage.Whenwethinkofgreenbuildings,wetendtothinkofnewones–thekindofhigh-tech,solar-paneledmasterpiecesthatmakethecoversofarchitecturemagazines.ButtheU.S.hasmorethan100millionexistinghomes,anditwouldbe47.G）incrediblywastefultotearthemalldownand48.K）replacethemwithgreenerversions.Anenormousamountofenergyandresourceswentintotheconstructionofthosehouses.Anditwouldtakeanaverageof65yearsforthe49.J）reducedcarbonemissionsfromanewenergy-efficienthometomakeupfortheresourceslostbydestroyinganoldone.Sointhebroadest50.L）sense,thegreenesthomeistheonethathasalreadybeenbuilt.Butatthesametime,nearlyhalfofU.S.carbonemissionscomefromheating,coolingand51.H）poweringourhomes,officesandotherbuildings."Youcan'tdealwithclimatechangewithoutdealingwithexistingbuildings,"saysRichardMoe,thepresidentoftheNationalTrust.Withsome52.D）exceptions,theoldesthomestendtobetheleastenergy-efficient.Housesbuiltbefore1939useabout50%moreenergypersquarefootthanthosebuiltafter2000,mainlyduetothetinycracksandgapsthat53.E）expandovertimeandletinmoreoutsideair.Fortunately,therearea54.O）vastnumberofrelativelysimplechangesthatcangreenolderhomes,from55.F）historiconeslikeLincoln'sCottagetoyourownpostwarhome.Andefficiencyupgrades(升级)cansavemorethanjusttheearth;theycanhelp56.I）protectpropertyownersfromrisingpowercosts.注意：此部分试题请在答题卡2上作答。A)accommodationsB)clumsyC)doubtfulD)exceptionsE)expandF)historicG)incrediblyH)poweringI)protectJ)reducedK)replaceL)senseM)shiftedN)supplyingO)vast2011年6月大学英语四级真题Questions47to56arebasedonthefollowingpassage.Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderlypeople47N）tendtosleepforfewerhoursthantheydidwhentheywereyounger,thishasa(n)48L）negativeeffectontheirbrain'sperformanceandtheywouldbenefitfromgettingmore,accordingtoresearch.SeanDrummond,a.psychiatrist(心理医生)attheUniversityofCalifornia,SanDiego,saidolderpeoplearemorelikelytosufferfrombrokensleep,whileyoungerpeoplearebetteratsleeping49H）efficientlystraightthroughthenight.Moresleepinoldage,however,is50B）associatedwithbetterhealth,andmostolderpeoplewouldfeelbetterandmore51A）alertiftheysleptforlongerperiods,hesaid.“Theabilitytosleepinonechunk(整块时间)overnightgoesdownasweagebuttheamountofsleepweneedto52J）functionwelldoesnotchange,”DrDrummondtoldtheAmericanAssociationfortheAdvancementofScienceconferenceinSanDiego.“It's53F）definitelyamyththatolderpeopleneedlesssleep.Themorehealthyanolderadultis,themoretheysleepliketheydidwhentheywere54O）younger.Ourdatasuggeststhatolderadultswouldbenefitfrom55E）continuingtogetasmuchsleepastheydidintheir30s.That's56G）differentfrompersontoperson,buttheamountofsleepwehadat35isprobablythesameamountasweneedat75.”注意：此部分试题请在答题卡2上作答。A)alertI)formallyB)associatedJ)functionC)attractingK)mixedD)clingL)negativeE)continuingM)sufficientF)definitelyN)tendG)differentO)younger47.tendto固定搭配；表示“倾向于；”符合句意；48.空格后是effect，前面是a(n)，由此可见，该处需要填入一个形容词；题目给出的形容词有negative,sufficient,younger；根据前后语意，填入negative最为恰当，表示“少的睡眠时间对大脑的活动有负面的影响。”49.根据推测，该处应该填入一个副词，题目给出的副词有efficiently,definitely,formally；前面提到，老年人在睡觉的时候更容易被打断，而后面用w...
