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1、四级真题选词填空练习12国贸1.Withtheworld’spopulationestimatedtogrowfromsixtoninebillionby2050,researchers,businessesandgovernmentsarealreadydealingwiththeimpactthisincreasewillhaveoneverythingfromfoodandwatertoinfrastructureanjobs.Underlyingallthis47___willbethedemandfore
2、nergy,whichisexpectedtodoubleoverthenext40years.Findingtheresourcestomeetthisdemandina48____,sustainablewayisthecornerstoneofournation’senergysecurity,andwillbeoneofthemajor49____ofthe21stcentury.Alternativeformsofenergy---bio-fuels,windandsolar,tonameafew---a
3、re50__beingfundedanddeveloped,andwillplayagrowing51__intheworld’senergysupply.Butexpertssaythat,evenwhen52___,alternativeenergysourceswilllikelymeetonlyabout30%oftheworld’senergyneedsby2050.Forexample,evenwith53__investments,suchasthe$93millionforwindenergydev
4、elopment54____intheAmericanRecoveryandReinvestmentAct,importantalternativeenergysourcessuchaswindandbio-fuels55__onlyabout1%ofthemarkettoday.Energyandsustainabilityexpertssaytheanswertoourfutureenergyneedswilllikelycomefromalotof56___---bothtraditionalandalter
5、native.（2011.12）AstableBsolutionsCsignificantDroleEprogressFmarvelousGincludedHgrowthIexactlyJconsistKcompriseLcompetitionsMcombinedNchallengesOcertainlyAnswer:47-51___________________52-56___________________________2.Thepopularnotionthatolderpeopleneedlesssle
6、epthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderlypeople47tosleepforfewerhoursthantheydidwhentheywereyounger,thishasa(n)48effectontheirbrain'sperformanceandtheywouldbenefitfromgettingmore,accordingtoresearch.SeanDrummond,apsychiatrist(心理医生)attheUn
7、iversityofCalifornia,SanDiego,saidthatolderpeoplearemorelikelytosufferfrombrokensleep,whileyoungerpeoplearebetteratsleeping49straightthroughthenight.Moresleepinoldage,however,is50withbetterhealth,andmostolderpeoplewouldfeelbetterandmore51iftheysleptforlongerpe
8、riods,hesaid."Theabilitytosleepinonechunk(整块时间)overnightgoesdownasweagebuttheamountofsleepweneedto52welldoesnotchange,"DrDrummondtoldtheAmericanAssociationfortheAdvancementofScienc
