欢迎来到天天文库
浏览记录
ID:58841799
大小:69.00 KB
页数:9页
时间:2020-09-24
《电大学位英语考资料.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、PartIReadingComprehension(30%) Directions:Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.YoushoulddecideonthebestchoiceandblackenthecorrespondingletterontheAnswerSheet。 Passag
2、e1 QuestionsIto5arebasedonthefollowingpassage: Spending50minuteswithacellphoneclosetoyourearisenoughtochangebraincellactivityinthepartofthebrainclosesttotheantenna(天线).Butwhetherthatcausesanyharmisnotclear,scientistsattheNationalInstituteofHealthsaidataconferencelast
3、month,addingthatthestudywillnotlikelysettleconcernsofalinkbetweencellphonesandbraincancer.“Whatweshowedisglucose(葡萄糖)metabolism(代谢)(asignofbrainactivity)increasesinthebraininpeoplewhowereexposedtoacellphoneintheareaclosesttotheantenna,”saidDr.NoraVolkowoftheNIH,whosest
4、udywaspublishedintheJournaloftheAmericanMedicalAssociation.(76)Thestudywasmeanttoexaminehowthebrainreactstoelectromagneticfieldscausedbywirelessphonesignals。 Volkowsaidshewassurprisedthattheweakelectromagneticradiation(电磁辐射)fromcellphonescouldaffectbrainactivity,butsh
5、esaidthefindingsdonotshedanylightonwhethercellphonescausecancer.“Thisstudydoesnotinanywayindicatethat.Whatthestudydoesistoshowthehumanbrainissensitivetoelectromagneticradiationfromcellphoneexposures。”Useofthedeviceshasincreaseddramaticallysincetheywereintroducedintheea
6、rly1980s,withabout5billioncellphonesnowinuseworldwide。 Somestudieshavelinkedcellphoneexposuretoanincreasedriskofbraincancers,butalargestudybutheWorldHealthOrganizationdidnotofferaclearanswertothis.Volkow’steamstudied47peoplewhohadtheirbrainexaminedwhileacellphonewastu
7、rnedonfor50minutesandanotherwhilethephonewasturnedoff.Whiletherewasnocompletechangeinbrainmetabolism,theyfounda7percentincreaseinbrainmetabolismintheregionclosesttothecellphoneantennawhenthephonewason。 (77)Expertssaidtheresultswereinteresting,buturgedthattheybeunderst
8、oodwithgreatcare.“Althoughthebiologicalsignificance,ifany,ofincreasedglucosemetabolismfromtoomuchcellphoneexposureisu
此文档下载收益归作者所有