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1、北京地區(qū)成人本科學(xué)士學(xué)位英語(yǔ)統(tǒng)一考試PartIReadingComprehension（30%）Directions：Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA，B，CandD.YoushoulddecideonthebestchoiceandblackenthecorrespondingletterontheAnswerShe
2、et.Passage1QuestionsIto5arebasedonthefollowingpassage：Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna（天線）。Butwhetherthatcausesanyharmisnotclear，scientistsattheNationalInstituteofHealthsaidataconferencelast
3、month，addingthatthestudywillnotlikelysettleconcernsofalinkbetweencellphonesandbraincancer.“Whatweshowedisglucose（葡萄糖）metabolism（代謝）（asignofbrainactivity）increasesinthebraininpeoplewhowereexposedtoacellphoneintheareaclosesttotheantenna，"saidDr.NoraVolkowoftheNIH，whosestudywa
4、spublishedintheJournaloftheAmericanMedicalAssociation.（76）Thestudywasmeanttoexaminehowthebrainreactstoelectromagneticfieldscausedbywirelessphonesignals.Volkowsaidshewassurprisedthattheweakelectromagneticradiation（電磁輻射）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
