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1、2013年5月PartI ReadingComprehension(30%)Directions:Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.YoushoulddecideonthebestchoiceandblackenthecorrespondingletterontheAnswerSheet.Passage1Qu
2、estions1to5arebasedonthefollowingpassage:Isthat6a.m.workoutgettinginthewayofgoodsleep?Don’tthinkyourfatcellswon’tnotice.AnewstudypublishedinTheAnnalsofInternalMedicine (amedicaljournal)findsthatinadequateshut-eyehasaharmfuleffectonfatcells,reducingtheirabilitytorespondtoinsuli
3、n(胰岛素)byabout30percent.Overthelong-term,thisdecreasedresponsecouldsetthestagefortype-2diabetes(amedicalconditioninwhichsomeonehastoomuchsugarinhisorherblood),fattyliverdiseaseandweightgain.Thestudyaddstoagrowingbodyofevidencethatthere’s“anintimaterelationshipbetweentheamountof
4、sleepwegetandourabilitytomaintainagood,healthybodyweight,”sayssleepexpertHeleneEmsellem,directoroftheCenterforSleepandWakeDisordersinChevyChase,Maryland.(76) ButAmericansdon’tseemtobegettingthemessagethatweneedseventoninehourspernight. Morethan1in5ofus,accordingtoareportfromth
5、eCentersforDiseaseControlandPrevention,isgettingsixorfewerhoursofsleeppernight,onaverage.SohowdidresearchersstudyfatcellsintheAnnalspaper?MatthewBradyoftheUniversityofChicagoandagroupofcolleaguesselectedandpersuadedsevenvolunteerstotakepartintheresearchproject.Theywereallyoung
6、,thinandhealthyandagreedtosleepforeightnightsinasleeplab.“Forfournightstheywereallowedtostayinbedfor8.5hoursanight,”saysBrady.Then,amonthlater,theycamebackforfouradditionalnights—butthistimetheywereallowedjust4.5hoursofsleeppernight.Andaftereachvisit,researchersgotasampleofthe
7、irfat.(77) Bradyexplainsthatthefatcellsrespondedsignificantlytothelossofsleep. “Iwasverysurprisedtobehonest,”hesays.Badthingscanhappenwhenfatcellsbecomelessresponsivetoinsulin.“Fatcellsareactuallyyourfriend,”hesays.“They’retheretostorelipids(血脂).”whenlipidsstayinsidethecells,y
8、ourbodycanutilizethefatwhenyou’reexercisingorsleepingorgoinga
