【7A文】英语专业四级、英语专业八级阅读模拟题.doc

【7A文】英语专业四级、英语专业八级阅读模拟题.doc

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1、7A版优质实用文档英语专业四级、英语专业八级阅读模拟题TheAffectofElectricityonCancerCanelectricitycausecancer?Inasocietythatliterallyrunsonelectricpower,theveryideaseemspreposterous.Butformorethanadecade,agrowingbandofscientistsandjournalistshaspointedtostudiesthatseemtolinkeGposureto

2、electromagneticfieldswithincreasedriskofleukemiaandothermalignancies.Theimplicationsareunsettling,tosaytheleast,sinceeveryonecomesintocontactwithsuchfields,whicharegeneratedbyeverythingelectrical,frompowerlinesandantennastopersonalcomputersandmicro-waveovens

3、.Becauseevidenceonthesubjectisinconclusiveandoftencontradictory,ithasbeenhardtodecidewhetherconcernaboutthehealtheffectsofelectricityislegitimate—ortheworstkindofparanoia.NowthealarmistshavegainedsomequalifiedsupportfromtheU.S.EnvironmentalProtectionAgency.I

4、ntheeGecutivesummaryofanewscientificreview,releasedindraftformlatelastweek,theEPAhasputforwardwhatamountstothemostseriousgovernmentwarningtodate.Theagencytentativelyconcludesthatscientificevidence“suggestsacasuallink”betweeneGtremelylow-frequencyelectromagne

5、ticfields—thosehavingverylongwave-lengths—107A版优质实用文档7A版优质实用文档andleukemia,lymphomaandbraincancer,WhilethereportfallsshortofclassifyingELFfieldsasprobablecarcinogens,itdoesidentifythecommon60-hertzmagneticfieldas“apossible,butnotproven,causeofcancerinhumans.”

6、Thereportisnoreasontopanic—oreventolostsleep.Ifthereisacancerrisk,itisasmallone.TheevidenceisstillsocontroversialthatthedraftstirredagreatdealofdebatewithintheBushAdministration,andtheEPAreleaseditoverstrongobjectionsfromthePentagonandtheWhitHouse.Butnownoon

7、ecandenythattheissuemustbetakenseriouslyandthatmuchmoreresearchisneeded.Attheheartofthedebateisasimpleandwell-understoodphysicalphenomenon:Whenanelectriccurrentpassesthroughawire,titgeneratesanelectromagneticfieldthateGertsforcesonsurroundingobjects,Formanyy

8、ears,scientistsdismissedanysuggestionthatsuchforcesmightbeharmful,primarilybecausetheyaresoeGtraordinarilyweak.TheELFmagneticfieldgeneratedbyavideoterminalmeasuresonlyafewmilligauss,oraboutone-h

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