2011年5月北京地区成人英语三级真题及答案

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1、北京2011年5月成人本科学士学位英语统一考试真题及答案北京地区成人本科学士学位英语统一考试2011年05月07日　　PartI ReadingComprehension(30%)　　Directions:Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.Youshoulddecideo

2、nthebestchoiceandblackenthecorrespondingletterontheAnswerSheet。　　Passage1　　QuestionsIto5arebasedonthefollowingpassage:　　Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna(天线).Butwhetherthatcau

3、sesanyharmisnotclear,scientistsattheNationalInstituteofHealthsaidataconferencelastmonth,addingthatthestudywillnotlikelysettleconcernsof alinkbetweencellphonesandbraincancer.“Whatweshowedisglucose(葡萄糖)metabolism(代谢)(asignofbrainactivity)increasesinthebraininp

4、eoplewhowereexposedtoacellphoneintheareaclosesttotheantenna,”saidDr.NoraVolkowoftheNIH,whosestudywaspublishedintheJournaloftheAmericanMedicalAssociation.(76)Thestudywasmeanttoexaminehowthebrainreactstoelectromagneticfieldscausedbywirelessphonesignals。　　Volko

5、wsaidshewassurprisedthattheweakelectromagneticradiation(电磁辐射)fromcellphonescouldaffectbrainactivity,butshesaidthefindingsdonotshedanylightonwhethercellphonescausecancer.“Thisstudydoesnotinanywayindicatethat.Whatthestudydoesistoshowthehumanbrainissensitivetoe

6、lectromagneticradiationfromcellphoneexposures。”Useofthedeviceshasincreaseddramaticallysincetheywereintroducedintheearly1980s,withabout5billioncellphonesnowinuseworldwide。　　Somestudieshavelinkedcellphoneexposuretoanincreasedriskofbraincancers,butalargestudybu

7、theWorldHealthOrganizationdidnotofferaclearanswertothis.Volkow’steamstudied47peoplewhohadtheirbrainexaminedwhileacellphonewasturnedonfor50minutesandanotherwhilethephonewasturnedoff.Whiletherewasnocompletechangeinbrainmetabolism,theyfounda7percentincreaseinbr

8、ainmetabolismintheregionclosesttothecellphoneantennawhenthephonewason。　　(77)Expertssaidtheresultswereinteresting,buturgedthattheybeunderstoodwithgreatcare.“Althoughthebiologicalsignificance,ifan