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1、北京地区成人本科学士学位英语统一考试2013.05.11Passage1Isthat6a.m.workoutgettmgmtliewayofgoodsleep?Donttlunkyourfatcellswontnotice.AnewstudypublishedinTheAimalsofLiternalMedicme(amedicaljournal)findsthatinadequateshut-eyehasaharmfuleffectonfatcells,reducingtheirabilitytorespondtoinsulin(丿康岛素)byabout30percentOvertlielo
2、ng-term,tinsdecreasedresponsecouldsetthestagefortype-2diabetes(amedicalconditioninwliichsomeonehastoomuchsugarinhisorherblood),fattyliverdiseaseandweightgain.Thestudyaddstoagrowingbodyofevidencethattherecanhitmiaterelationshipbehveentheamountofsleepwegetandourabilitytomamtamagood,healthybodyweightys
3、ayssleepexpertHeleneEnisellem,directoroftheCenterforSleepandWakeDisordersinChevyChase,Maiyland.(76)ButAmericansdontseemtobegettingthemessagethatweneedseventomil亡houispairnight.WIoiethan1in5ofus,accordmgtoareportfromtheCentersforDiseaseControlandPrevention,isgettingsixorfewerhoursofsleeppernight,onav
4、erageSohowdidresearchersstudyfatcellsintheAnnalspaper?MatthewBradyoftheUniversityofCliicagoandagroupofcolleaguesselectedandpersuadedsevenvolunteerstotakepartinthereseaichproject.Theywereallyoung,thmandhealthyandagreedtosleepforeightnightsinasleeplab.uForfournightstlieywereallowedtostayinbedfor8.5hou
5、rsanightysaysBrady.Then,amonthlatei;theycamebackforfouradditionalmghtsbutthistimetheywereallowedjust4.5hoursofsleeppernight.Andaftereachvisit,reseaicheisgotasampleoftheirfat.(77)Eiadyexplainsthatth亡fatcellsrespondedsignificantlYtothelossofsle亡pIwasverysuipnsedtobehonestJhesays.Badthmgscanhappenwhenf
6、atcellsbecomelessresponsivetoinsulin.clFatcellsareactuallyyourfhendrhesays.They，retheretostorelipids(血月旨)Whenlipidsstayinsidethecells,yourbodycanutilizethefatwhenyoureexercisingorsleepmgorgoingaboutyourday.However,whenfatcellsstaretobecomenisuliiiresistant,thelipidsstartoleachoutofthefatcellsandrise
7、inthebloodstreamBradysays.1. Accordmgtothepassage,lackofsleepforalongwliilecanprobablyleadtoallofthefollowingEXCEPTA. heartdiseaseEweightgainCdiabetesDliverdisease2. ThemainideaofthethirdparagraphisA.howtowriteamedicalresearchpaperEhowtoavoidsleeplossC. howtheresearchwasconductedDhowtoconductamedica
8、lexperiment3. WhatdoestheTeach”illthelastparagiaphprobablymean?A.Leap.E.Lead.C. Lean.DLeak.4. WliichofthefollowingisNOTTRUEaccordingtothepassage?A.Wewillbeintroubleifourfatcellsbecomelessresponsivetoinsulin.E.MoreandmorestudiesaiedonetostudythelmdbetweensleepandweightC. Morethan20%ofAmericansaienotg
9、ettmgenoughsleepD. Fatcellsaietlieretohelpusmaintainagoodhealth5. Wliichofthefollowingisanappropriatetitleforthispassage?A.PoorSleepMayLeadtoTooMuchStoredFatandDiseaseE. SleepExpertsHadExcitmgFmdmgsinaFatStudyC. AmericansShouldHaveMoreThanSixHoursofSleepD. BadTilingsHappenifFatCellsBecomeOuiFriendPa
10、ssage2Thetopoftheworldisawondeiland.Inwinter,thetemperatureoftenfallsto-30Fandthesunneverrises.TheoceanissurroundedbyfiozengroundThereaiefewpeopleortrees,buttopolarbeais,theArctic（j匕极）ishome（78）Polar2arshavethickbigpawsandoth亡】fbatuiesthatmakethemwellp代paiedfbi11传inthentoughenviionm亡nt.Infact,theyne
11、edtheArcticseaiceforsurvival.Butclimatechangeiscausinglargerandlargerareasofsummerseaicetom亡It（融彳匕）.Expertssaythatifwanningpatternscontinue，theArcticcouldbefleeofsunmierseaiceby2050.Thatmaycausetwothkdsoftheworlds20,000polarbeaistobegonebythentoo.Polarbearscantsuiviveforlongonland.Sealsaretlieirmain
12、sourceoffood.Theonlyplacewherepolarbearscanhuntsealsisontheice.（79）Althoughth亡s亡beaisaiestrongswinimeis.theyaenomatchfoilightningswiftsealsinth亡watei.Apolai-bearhasbrilliantlycleverstiategiestoovercometinsdisadvantage.IllwinterthebearwaitsmotionlessbesideaseaFsbreatlunghole,wliichisanarrowtunneltluo
13、ughtheice.Oftennianvhourspassbeforethesealcomesupforakandthebearkillsitwitliapowerfulblowofitspaw.Insuimner,thepolarbearsthatliveonlandeatveiylittleandwaitfortheseaicetoreturnWiththeseaicefbrniuiglaterintheyearandmeltingearlier,polarbearsdonothaveenoughoppoituiiitytohuntandeat.Lessseaicemakesithaide
14、rfortliebeaistocatchtheseals.Thebearsmustswimlongerdistancesbetweenicepacks（人片i孚冰）,andtlieycan*talwaysmakeit.Theiceisalsogettmgthnmer.Theseconditionscancausepolai-bearcabstobecomeseparatedfromtheirmothers,whoprovidethemwithfoodStevenAinstmpisthechiefscientistofPolarBearsInternational.Thegroupaimstos
15、avethebeaisandthekhomeTh亡morepeoplewhoseepolarbearsandunderstandthekdifficultsituation,thebetterthechaiicewellalterourwarniuigpatliintimetosavethemj*hesavsxJ6. Wliichisthebesttitleforthepassage?A.ClunateChangeintheArcticCTheAicticTsHometoPolarBears7. Wheredopolarbearsusuallyhuntseals?A.OnlandCInopei
16、uiigsintheseaice&Thewordcubs”inthefourthparagraphA.adults】BbabiesE. HowtoProtecttheEnviiomnentDPolarBearsinDangerB. hiopenwater.DAtthebottomoftheseaclosestinmeaningtoChuntersDenemies9. Accordmgtotliepassage,whichofthefollowingstatementsisTRUE?A.Starvingpolarbearsaiemcreasinglycoiningintovillages,wheretheymaybekilledeitlierforfoodorsafety.EPolarb
