上半学士学位英语试题.doc

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1、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.YoushoulddecideonthebestchoiceandblackenthecorrespondingletterontheAnswerShe

2、et.Passage1QuestionsIto5arebasedonthefollowingpassage：Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna（天线）。Butwhetherthatcausesanyharmisnotclear，scientistsattheNationalInstituteofHealthsaidataconferencelast

3、month，addingthatthestudywillnotlikelysettleconcernsofalinkbetweencellphonesandbraincancer.“Whatweshowedisglucose（葡萄糖）metabolism（代谢）（asignofbrainactivity）increasesinthebraininpeoplewhowereexposedtoacellphoneintheareaclosesttotheantenna，"saidDr.NoraVolkowoftheNIH，whosestudywa

4、spublishedintheJournaloftheAmericanMedicalAssociation.（76）Thestudywasmeanttoexaminehowthebrainreactstoelectromagneticfieldscausedbywirelessphonesignals.Volkowsaidshewassurprisedthattheweakelectromagneticradiation（电磁辐射）fromcellphonescouldaffectbrainactivity，butshesaidthefind

5、ingsdonotshedanylightonwhethercellphonescausecancer.“Thisstudydoesnotinanywayindicatethat.Whatthestudydoesistoshowthehumanbrainissensitivetoelectromagneticradiationfromcellphoneexposures.”Useofthedeviceshasincreaseddramaticallysincetheywereintroducedintheearlyl980s，withabou

6、t5billioncellphonesnowinuseworldwide.Somestudieshavelinkedcellphoneexposuretoanincreasedriskofbraincancers.butalargestudybytheWorldHealthOrganizationdidnotofferaclearanswertothis.Volkow‘steamstudied47peoplewhohadtheirbrainexaminedwhileacellphonewasturnedonfor50minutesandano

7、therwhilethephonewasturnedoff.Whiletherewasnocompletechangeinbrainmetabolism，theyfounda7percentincreaseinbrainmetabolismintheregionclosesttothecellphoneantennawhenthephonewason.（77）Expertssaidtheresultswereinteresting，buturgedthattheybeunderstoodwithgreatcare.“Althoughthebi

8、ologicalsignificance，ifany，ofincreasedglucosemetabolismfromtoomuchcellphoneexposur