文档介绍：北京***本科学士学位英语考试真题及答案2011年05月07日13:prehension(30%)Directions:,B,。Passage1QuestionsIto5arebasedonthefollowingpassage:Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna(天线).Butwhetherthatcausesanyharmisnotclear,scientistsattheNationalInstituteofHealthsaidataconferencelastmonth,addingthatthestudywillnotlikelysettleconcernsofalinkbetweencellphonesandbraincancer.“Whatweshowedisglucose(葡萄糖)metabolism(代谢)(asignofbrainactivity)increasesinthebraininpeoplewhowereexposedtoacellphoneintheareaclosesttotheantenna,”,whosestudywaspublishedintheJournaloftheAmericanMedicalAssociation.(76)icfieldscausedbywirelessphonesignals。icradiation(电磁辐射)fromcellphonescouldaffectbrainactivity,butshesaidthefindingsdonotshedanylightonwhethercellphonescausecancer.“。”Useofthedeviceshasincreaseddramaticallysincetheywereintroducedintheearly1980s,withabout5billioncellphonesnowinuseworldwide。Somestudieshavelinkedcellphoneexposuretoanincreasedriskofbraincancers,’,theyfounda7percentincreaseinbrainmetabolismintheregionclosesttothecellphoneantennawhenthephonewason。(77)Expertssaidtheresultswereinteresting,buturgedthattheybeunderstoodwithgreatcare.“Althoughthebiologicalsignificance,ifany,ofincreasedglucosemetabolismfromtoomuchcellphoneexposureisunknown,theresultsrequirefurtherinvestigation,”,wroteinanarticleinJAMA.“ofurtherinvestigateandunderstandtheseeffects。”Theywro