2011北京地区学位英语独家文字版真题与答案.doc

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1、2011北京地区学位英语独家文字版真题与答案北京地区成人本科学士学位英语统一考试　　PartIReadingComprehension(30%)　　Directions:Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.Youshoulddecideonthebestchoiceandb

2、lackenthecorrespondingletterontheAnswerSheet.　　Passage1　　QuestionsIto5arebasedonthefollowingpassage:　　Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna(天线)．Butwhetherthatcausesanyharmisnotcle

3、ar,scientistsattheNationalInstituteofHealthsaidataconferencelastmonth,addingthatthestudywillnotlikelysettleconcernsofalinkbetweencellphonesandbraincancer.“Whatweshowedisglucose(葡萄糖)metabolism(代谢)(asignofbrainactivity)increasesinthebraininpeoplewhowereexposed

4、toacellphoneintheareaclosesttotheantenna，"saidDr．NoraVolkowoftheNIH，whosestudywaspublishedintheJournaloftheAmericanMedicalAssociation．(76)Thestudywasmeanttoexaminehowthebrainreactstoelectromagneticfieldscausedbywirelessphonesignals．Volkowsaidshewassurprisedt

5、hattheweakelectromagneticradiation(电磁辐射)fromcellphonescouldaffectbrainactivity,butshesaidthefindingsdonotshedanylightonwhethercellphonescausecancer．“Thisstudydoesnotinanywayindicatethat．Whatthestudydoesistoshowthehumanbrainissensitivetoelectromagneticradiati

6、onfromcellphoneexposures.”Useofthedeviceshasincreaseddramaticallysincetheywereintroducedintheearlyl980s，withabout5billioncellphonesnowinuseworldwide．　　Somestudieshavelinkedcellphoneexposuretoanincreasedriskofbraincancers．butalargestudybytheWorldHealthOrganiz

7、ationdidnotofferaclearanswertothis．Volkow’steamstudied47peoplewhohadtheirbrainexaminedwhileacellphonewasturnedonfor50minutesandanotherwhilethephonewasturnedoff.Whiletherewasnocompletechangeinbrainmetabolism,theyfounda7percentincreaseinbrainmetabolisminthereg

8、ionclosesttothecellphoneantennawhenthephonewason．(77)Expertssaidtheresultswereinteresting,buturgedthattheybeunderstoodwithgreatcare.“Althoughthebiologicalsignificance，ifany,ofincreasedglucosemet