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1、本资料有镇江垦丁外语为您搜集大学英语四级阅读真题 Somanypeopleusethecellphonesofrequantlyeveryday,But___47__littleiscertainadouthehealtheffectsofitsuse.Macufacturers___48___thatcellphonesmeetgovernmentstandardsforsaferadio-frequencyradiationomission,butenoughstudiesarebeginningtodocument
2、apossible___49___inrarebraintumour(肿瘤)：bendachesandbehavioraldisordersinchildrentocauseconeem.Sofar,theavidenceisn't___50___onwhethertheuseofcellphones__51__toanyuncasedriskofcancer.Inanew trial,researchersasked47yolunteersto___52__inaprojecttomeasureglucose(葡萄糖)
3、consurnptioninthebrainbyscanningthebraintoseehowcellsuseenergy.Forboth50-minutescans,thevolunteershadacellphone__53__toeachear.Duringbefirstscan,thedeviceswereturnedoff,butforthesecondscan,thephoneontherightearas___54____onandreceivedarecorded-messagecall,although
4、theyolumewasmuted(消毒)sothedisewouldn'tbiastheresults.Theresultsofthesecondscanabowedthatthe__55__ofthebrainraresttothedevicehadhigherralesofglucoseconsumptionthantherestofthebrain.Thestudyowsthatcellphonescanchangebrainactivity,and__56__awholenewavenueforscientifi
5、cquiry,tuoughitdoesn'tsayanythingaboutwhethercell-phoneradiationcancausecancer. A)conclusive I)mission B)contributes J)participate C)derive K)particular D)expresses L)provides E)fixed M)regions F)immensely N)surprisingly G)increase O)switched H
6、)maintainSectionA Asyouareprobablyaware,thelatestjobmarketsnewsisn’tgood:Unemploymentisstillmorethan9percent,andnewjobgrowthhasfallenclosetozero.That’sbadfortheeconomy,ofcourse.Anditmaybeespeciallydiscouragingifyouhappentobelookingforajoborhopingtochangecareers
7、rightnow.Butitactuallyshouldn’tmattertoyounearlyasmuchasyouthink. That’sbecausejobgrowthnumbersdon’tmattertojobhuntersasmuchasjobturnoverdata.Afterall,existingjobsopenupeverydayduetopromotions,resignations,terminations,andretirements.(Yes,peopleareretiringevenint
8、hiseconomy.)Inbothgoodtimesandbad,turnovercreatesmoreopeningsthaneconomicgrowthdoes.EveninJuneof2007,whentheeconomywasstillhummingalong,jobgrowthwasonly
