2019-2020年高考英語二輪復(fù)習(xí)閱讀理解主旨大意題專練一標(biāo)題歸納類

2019-2020年高考英語二輪復(fù)習(xí)閱讀理解主旨大意題專練一標(biāo)題歸納類（xx?安徽合肥高三第二次教學(xué)質(zhì)量檢測）SusanBrownellAnthonywasaladyaheadofhertime.Shefoughtforwomen,srightslongbeforetheybecameapopularissue.SusanwasbornonFebruary15,1820,inAdams,Massachusetts.Atthattime,womenhadfewrights.Theycouldnotownproperty.Moneyearnedbyamarriedwomanbelongedtoherhusband.Majordecisionsregardingchildrenweremadebythefathers.Womencouldnotvote.Attheageof15,Susanbecameaschoolteacher.Shetaughtfor15years.Thenshebeganorganizingwomen,sgroupstopromotecausesthatwereimportanttowomen.Shehelpedgainbettereducationalrightsforwomen.Shehelpedgivemarriedwomenpossessionoftheirearnings.AftertheCivilWar,Susanbecameveryinvolvedinthewomen,ssuffragemovement.Afteryearsoflecturing,writing,andappealingbySusanandotherwomen,somepartsoftheUnitedStateschangedtheirlawstogivewomentherighttovote.ThefirststatewasWyomingin1869.OtherareasandstatesgraduallyfollowedWyoming'sdecision.Itwasnotuntil1920thattheU.S.Constitutionwaschangedtogiveallwomenvotingrights.SusanBrownellAnthonydiedin1906attheageof86.ShewaselectedtotheHallofFameforGreatAmericansin1950.ShewasthefirstAmericanwomantohavealikeness（肖像）ofherfaceonacoin.Itwasthe1979SusanBrownellAnthonydollar.【解題導(dǎo)語】 本文主要介紹了美國歷史上著名的女權(quán)運動領(lǐng)袖 SusanBrownellAnthony。她努力為婦女爭取了財產(chǎn)權(quán)、投票權(quán)等權(quán)利。【難句分析】 Thenshebeganorganizingwomen,sgroupstopromotecausesthatwereimportanttowomen.分析：該句為主從復(fù)合句，句中thatwereimportanttowomen為that引導(dǎo)的定語從句，修飾先行詞causes。譯文：隨后她開始組織婦女群體加速實現(xiàn)對婦女來說重要的目標(biāo)。WhatwasthesituationofAmericanwomenlikewhenSusanwasborn?Theyhadlowsocialstatus.Theycouldvoteaftergettingmarried.Theymanagedmoneyfortheirhusbands.D.Theywereresponsiblefordecisionmaking.解析：A考查細(xì)節(jié)理解。根據(jù)第二段中的“Atthattime,womenhadfewrights.Theycouldnotownproperty.Moneyearnedbyamarriedwomanbelongedtoherhusband.Majordecisionsregardingchildrenweremadebythefathers.Womencouldnotvote”可知，在那時，女性沒有什么權(quán)利，地位是低下的，故A項正確。B、C和D項均與此表述不符。Whatisthethirdparagraphmainlyabout?Susan,steachingexperiences.Susan,seducationalbackground.Susan,seffortstoabolishslavery.Susan,sfightingforwomen,scauses.解析：D考查段落大意。通讀第三段尤其是“Thenshebeganorganizingwomen'sgroupstopromotecausesthatwereimportanttowomen”可知，本段主要講述SusanBrownellAnthony為爭取女權(quán)而斗爭的情況，故D項正確。干擾項分析：A項僅為細(xì)節(jié)之一，無法概括該段大意；B項文中沒有提及；根據(jù)第三段的“Thenshebeganorganizingwomen,sgroupstopromotecausesthatwereimportanttowomen”可知，SusanBrownellAnthony為爭取女權(quán)而斗爭，而不是為廢除奴隸制而斗爭，故C項錯誤。Whatdoestheword“decision”inthefourthparagraphreferto?Promotingthesocialmovement.ChangingtheU.S.Constitution.Givingwomenvotingrights.Unitingotherareasandstates.解析：C考查詞義猜測。根據(jù)第四段第二句中的“somepartsoftheUnitedStateschangedtheirlawstogivewomentherighttovote”可知，在SusanBrownellAnthony的努力下，美國一些地區(qū)修改了法律，給了婦女投票權(quán)；結(jié)合該段第三、四句"ThefirststatewasWyomingin1869.OtherareasandstatesgraduallyfollowedWyoming'sdecision”可以判斷，畫線詞指代“給婦女投票權(quán)”這一決定，故C項正確。Whatmaybethebesttitleforthetext?ThefirstAmericanwomantoinventcoinsTheproblemofwomen,srightsintheU.S.ThemostpopularwomenorganizationsApioneerinfightingforwomen,srights解析：D考查標(biāo)題判斷。通讀全文可知，本文主要介紹了美國歷史上著名的女權(quán)運動領(lǐng)袖SusanBrownellAnthony。她為婦女爭取了財產(chǎn)權(quán)、投票權(quán)等權(quán)利。據(jù)此可知D項最適合作文章標(biāo)題。B（xx?安徽百所重點高中二模）Ihadthehonourofbeingelectedchiefofmytribe（部落）.Withthetitlecamegreatresponsibility.ItwasmyjobtomakepeacewiththeMaoriTamakitribe,whosevillagewevisited.Theirsoldiersjumpedfromacanoeandfacedusdownwithfiercecrying,stickingeyesandmuchnoiseofsticks.Theylaidapalmleafonthegroundand,ashead,Iwasforcedtoacceptthispeaceofferingbypickingitup,thentouchingnoseswiththeirchief.“Kiaora,“hesaid,welingusintothewoodlandhomeofhispeople.My“tribe“wasmyNewZealandcoachtourgroup,whohadforcedmeintobeintheirleader.We,dbeenwarnedthattheceremonywasaseriousoccasionandthattolaughorevensmilewouldbeconsideredrudetotheTamaki.AfterthatitwasnonstopfunastheydemonstratedtheirancientcustomsandIreceivedinstructioninperformingthehaka,thewardanceimmortalized（使不朽）bytheAllBlacksrugbyteam.Thentheypulledourdinneroflamb,beefandvegetablesoutoftheground.Ithadbeenslowcookedintheheatjustbelowthesurfaceinthegeothermal（地?zé)岬模゛reaofNorthIsland,aMaoritraditionknownasahangithatgoesbackanextremelylongperiodoftime.Obviously,thisformofitisputonfortouristsbutitwashugelyenjoyable.Thejourneybacktothehotelwasaloneworththeeffort,ourelderMaoridriverbeingdeservingofhisowntelevisionshow.“Thewheelsonthebusgoroundandround,”hegotussinging,whilehecircuitedaroundaboutthreetimes.Acoupleofdaysfromtheendofourtrip,therewasstillsomethingmissing,aNewZealandiconIwantedtoseetomakemygrandtourplete.Ridingoveraridge,thereitwas—Aotearoa.TheMaorinameforNewZealandtranslatesas“thelandofthelongwhitecloud”.CanIsay“Kiaora,Aotearoa?”YoubetIcan.【解題導(dǎo)語】 本文為記敘文，作者講述了他去新西蘭旅游時接觸到的毛利文化。Howwerethevisitorsgreetedinthetribe?Thesoldiersmadeapalmleafroad.Thesoldierstouchedtheirnoses.Thesoldiersshooksticksfiercely.Thesoldiersmadenoisewithshuteyes.解析：C考查細(xì)節(jié)理解。根據(jù)第一段中的“Theirsoldiersjumpedfromacanoeandfacedusdownwithfiercecrying,stickingeyesandmuchnoiseofsticks.Theylaidapalmleafonthegroundand”可知，毛利部落的勇士們從獨木舟上跳下來，用狂熱的叫喊、瞪大的眼睛和巨大的棍棒晃動聲將作者一行人鎮(zhèn)住了，他們還在地面上放置一片棕櫚葉。這些都是毛利人對游客表示歡迎的方式。故選C。WhichreferstotheMaoricookingcustom?A.Kiaora.B.Haka.C.Hangi. D.Tamaki.解析：C考查細(xì)節(jié)理解。根據(jù)第三段中的“Thentheypulledourdinneroflamb,beefandvegetablesoutoftheground.Ithadbeenslowcookedintheheat...aMaoritraditionknownasahangi”可知，在地下土爐中烹制食物是毛利飲食傳統(tǒng)，這被稱為hangi.Whatdoestheauthorthinkofthedriver?Hewasgoodatsinging.Hemadethejourneymemorable.Hewasnotfamiliarwiththeroad.HeperformedwellonaTVshow.解析：B考查推理判斷。根據(jù)第四段的“Thejourneybacktothehotelwasaloneworththeeffort,ourelderMaoridriverbeingdeservingofhisowntelevisionshow...”可知，作者一行人的回賓館之旅讓他們難忘：有表演天賦的毛利老司機(jī)讓作者他們一路歡歌，故選B。Whatisthebesttitleforthetext?AtasteofMaoricultureHello,NewZealandThehonourofbeingatribechiefThebestofNewZealand解析：A考查主旨要義。作者作為赴新西蘭的旅游團(tuán)的隊長，在旅游中有幸接觸毛利文化，這給作者留下了深刻的印象，故A項“體驗毛利文化”作標(biāo)題最佳。C（xx?東北三省四市教研聯(lián)合體高考模擬試卷二）OnApril14th,xx,myentirelifechangedinaninstant.OnemomentIwasjoyfullyridingthroughthesunshine.Thenextmoment,metal,fleshandboneswerespreadingagainstthepavementinathunderouscrash.Anothercyclist,bikingcarelessly,hadcutmeoffandsentmesupermanningtowardoningtraffic.Asiftosymbolizetheaccidentthathadhitmylife,anotherdisasteralsooccurredonApril14th,xx.Itcosttheairlineindustry$1.7billion.Tenmilliontravelerswerestuckfordays.Economicsallovertheworldweredisturbed.ThiswastheeruptionofEyjafjallajokull,oneofIceland,smanyvolcanoes.However,volcanoesarenotallbad.Infact,theyarenecessary.Theyareresponsibleforthebirthofnewearth,andforthecreationofrichsoil.Thiseruptiongaveoff0.15milliontonsofcarbondioxideintotheatmospheredaily.Butcancelling48%oftheworld,sflighttravelsavedabout2.8milliontonsofCO92fromenteringtheatmosphere,temporarilydecreasingourcarbonfootprint.Similarly,theaccidenthadbadlyaffectedmyemotionbutitalsoallowedmetolookmorecloselyinsidemyselfanddiscoverthingsaboutmyselfIwouldneverhaverealized.Ilearnedhownottojudgemyselfformynewlimitations.In1973,anotherIcelandicvolcano,Eldfell,brokeout.Icelandersdecidedtobombitwithcoldwateruntilitfrozeandchoseadifferentpath.Aftertheirplanworked,theyusedthegeothermal（地?zé)岬模〆nergyforthenext15yearstoheattheirhomes.Agoodexampleoflifebringinglemons,andmakinglemonade!Onemustmoveonfrommisfortunes,focusingonlyonthepresentmomentandbeinghopefulforthefuture.IranfromApril14th,xx,toeverykindofescape.EventuallyIendedupinuniversityforanewfoundloveinEarthsciences.【解題導(dǎo)語】作者把自己遭遇突發(fā)事件和火山爆發(fā)這種自然災(zāi)害進(jìn)行類比，說明遭遇到不幸也有好處，面對現(xiàn)實情況要樂觀積極。【難句分析】 Similarly,theaccidenthadbadlyaffectedmyemotionbutitalsoallowedmetolookmorecloselyinsidemyselfanddiscoverthingsaboutmyselfIwouldneverhaverealized.分析：but連接兩個并列分句，第二個分句中Iwouldneverhaverealized為省略了關(guān)系詞的定語從句。譯文：相似地，這次事故深深地影響了我的情緒，但是也讓我更深入地了解我自己，發(fā)現(xiàn)我從未認(rèn)識到的關(guān)于自身的事情。WhathappenedtothewriteronApril14th,xx?Hewasinvolvedinacarcrash.HewasstuckinanIceland,sairport.Hewitnessedavolcaniceruption.Hewasbadlyinjuredonabikeride.解析：D考查細(xì)節(jié)理解。根據(jù)文章第一段中的“Thenextmoment,metal...crash”和“Anothercyclist,bikingcarelessly,hadcutmeoffandsentmesupermanningtowardoningtraffic”可知，一個馬虎的騎自行車的人撞到了作者，作者遭遇了事故，受傷嚴(yán)重，故D項正確。干擾項分析：A項的carcrash和原文不一致；B、C兩項都不是發(fā)生在作者身上的事情。WhichwasaneffectoftheeruptionofEyjafjallajokull?Theeconomywascostgloballybytheeruption.Carbondioxideincreasedtemporarily.Mostoftheworld,splaneswereheldup.TheearthinIcelandwasterriblypolluted.解析：A考查細(xì)節(jié)理解。根據(jù)文章第二段中的“Economicsallovertheworldweredisturbed”可知，艾雅法拉火山爆發(fā)后，全世界的經(jīng)濟(jì)都受到了干擾，即火山的爆發(fā)使全球經(jīng)濟(jì)受損，故A項正確。干擾項分析：B項和文章第三段中的“savedabout...temporarilydecreasingourcarbonfootprint”矛盾；根據(jù)第二段中的“Itcosttheairline....fordays”可知,C項錯誤；根據(jù)第三段內(nèi)容可知，火山爆發(fā)能帶來肥沃的土壤，而不是污染土壤，故排除D項。WhydidthewritermentiontheEldfellvolcano?ItbrokeoutinIcelandonApril14thaswell.Itsymbolizedtheaccidentthatchangedhislife.Ittoldustomakethebestofagivensituation.Itencouragedhimtoknowmoreabouthimself.解析：C考查推理判斷。根據(jù)文章第五段中的“Aftertheirplanworked...theirhomes”并結(jié)合“Onemustmoveonfrommisfortunes,focusingonlyonthepresentmomentandbeinghopefulforthefuture”可推知，我們應(yīng)該充分利用特定的環(huán)境。干擾項分析：A項提到的日期不對；根據(jù)第二段的第一句可排除B項；鼓勵作者更多地了解自己的是自行車事故，故排除D項。Whatisthebesttitleforthepassage?EscapefromVolcanoesInspirationfromDisastersLoveforEarthSciencesAttitudeTowardNature解析：B考查主旨大意。本文作者通過講述自己遭遇事故和火山爆發(fā)帶來的好處及壞處，告訴人們要積極應(yīng)對現(xiàn)實情況，所以選B項。2019-2020年高考英語二輪復(fù)習(xí)閱讀理解主旨大意題專練三段落大意類（xx?煙臺診斷）Grandparentswhohelpoutoccasionallywithchildcareintheirmunitytendtolivelongerthanseniorswhodonotcareforotherpeople,accordingtoastudyfromBerlin,Germany.“Havingnocontactwithgrandchildrenatallcannegativelyimpactgrandparents,health.Thislinkcouldbedeeplyrootedinourevolutionarypastwhenhelpwithchildcarewasimportantforthesurvivalofthehumanspecies”saidSonjaHilbrand,oneoftheresearchers.Thefindingsaredrawnfromdataonmorethan500peopleoverage70.Overall,afteraccountingforgrandparents,ageandgeneralstateofhealth,theriskofdyingovera20yearperiodwasonethirdlowerforgrandparentswhocaredfortheirgrandchildren,paredwithgrandparentswhoprovidednochildcare.Caregivingwasassociatedwithalongerlifeevenwhenthecarereceiverwasn'tarelative.Halfofallchildlessseniorswhoprovidedsupporttofriendsorneighborslivedforsevenyearsafterthestudybegan,whilenonhelperslivedforfouryearsonaverage.“Caregivingmaygivecaregiversapurposeoflifebecausetheymayfeelusefulforothersandsociety.Caregivingmaybethoughtalsoasanactivitythatkeepscaregiversphysicallyandmentallyactive，”saidProfessorBrunoArpino.Arpinonoted,however,thatcaregivingisnottheonlyactivitythatcanimprovehealthandthattoomanycaringresponsibilitiescantakeawayfromotherbeneficialactivitieslikeworking,beinginsocialclubs,orvolunteering.“Childrenshouldtakeintoaccounttheirparents'needs,willingness,anddesiresandagreewiththemonthetimingandamountofchildcare，”hesuggested.“Itisveryimportantthateveryindividualdecidesforhimself/herself,what’properamountsofhelp'means，”Hilbrandsaid,adding,“Aslongasyoudonotfeelstressedabouttheintensity（強(qiáng)度）ofhelpyouprovideyoumaybedoingsomethinggoodforothersaswellasforyourself.”體裁：議論文題材：社會文化主題：祖父母適當(dāng)照顧孫輩對身體有益【語篇導(dǎo)讀】德國柏林一項研究發(fā)現(xiàn)，祖父母適當(dāng)?shù)貛兔φ疹檶O輩比不照顧孫輩的老年人壽命長。Whatisthecaregivingstudybasedon?Humanevolutionaryhistory.Demandofmodernsociety.Socialcontactbetweenrelatives.Dataonmanyelderlypeople.解析：D推理判斷題。根據(jù)文章第三段第一句Thefindingsaredrawnfromdataonmorethan500peopleoverage70可知，這一發(fā)現(xiàn)是從對500多個70歲以上的老人的數(shù)據(jù)分析得來的。故選D項。InArpino,sopinion,childcare.issuretokeepoldpeopleawayfromillnessesallowsoldpeopletoliveamoremeaningfullifecreatesmorejobopportunitiesforoldpeoplemakessocialactivitiesinaccessibletooldpeople解析：B推理判斷題。根據(jù)題干中的 Arpino,sopinion定位至文章第五段中的“Caregivingmaygivecaregiversapurposeoflifebecausetheymayfeelusefulforothersandsociety...”可知，看護(hù)小孩讓看護(hù)人覺得生活有了目的，因為他們覺得自己對他人和社會是有用的，也就是說，看護(hù)小孩可以使他們感覺生活得有意義。故選B項。3.Whatdoestheunderlinedpart“takeintoaccount”inParagraph6probablymean?A.Limit. B.Ignore.C.Favor. D.Consider.解析：D詞義猜測題。根據(jù)上文中toomanycaringresponsibilitiescantakeawayfromotherbeneficialactivities及后面的“...theirparents,needs,willingness,anddesiresandagreewiththemonthetimingandamountofchildcare,”可知，過多的照看責(zé)任會使老人無法從事其他有意義的活動，所以孩子應(yīng)考慮老人的需求、意愿和渴求，同意他們照顧孩子的時間長度和強(qiáng)度的選擇。由此可猜測，takeintoaccount意為“考慮”，與consider意義相近。故選D項。Whatdoesthelastparagraphtellus?Grandparentscandoanythingintheirowninterests.Grandparentsshouldsharemoresocialresponsibilities.Properamountsofchildcaredogoodtograndparents.Caregivingguaranteeseverygrandparentalongerlife.解析：C細(xì)節(jié)理解題。根據(jù)最后一段中“Aslongasyoudonotfeelstressedabouttheintensityofhelpyouprovideyoumaybedoingsomethinggoodforothersaswellasforyourself.”可知，只要你幫忙的強(qiáng)度不會讓你感到有壓力，這對他人、對你自己都是有好處的。由此可知，適當(dāng)?shù)卣疹櫺『ψ娓改赣泻锰帯９蔬xC項。長難句分析：Overall,afteraccountingforgrandparents,ageandgeneralstateofhealth,theriskofdyingovera20yearperiodwasonethirdlowerforgrandparentswhocaredfortheirgrandchildren,paredwithgrandparentswhoprovidednochildcare.句式分析：本句為主從復(fù)合句。其中，Overall在此為副詞，在句中作狀語；after為介詞，其后接動名詞短語作賓語;兩個who均引導(dǎo)定語從句;paredwithgrandparentswho...為過去分詞短語作狀語。句意：總的來說，在考慮祖父母的年齡和大致的健康狀況后，與那些沒照顧孫輩的祖父母相比，那些照顧孫輩的祖父母在20年間的死亡風(fēng)險要低三分之一。B（xx?湖北省武漢市高中畢業(yè)生調(diào)研測試）Cryingisthesignoftherawestofhumanemotions.Wecrywhenwecan,tholdinsidewhatwefeelanymore.Wecrywhenwe,reatourbest,andwhenwe,reatourworst.Bywe,Imeanallofus.Menincluded.Butweneverseeothermencry.Innowesternculturehasiteverbeenacceptableformentoshed（流淚）morethanasingletear,andeventhenit,sreservedforgrandvictories,defeatsanddeaths.Dutchresearchsuggeststhatwomencrybetweenthreeandfivetimesmorethanmen.Generallymenandwomencryoverthesamethingdeaths,breakupsandhomesickness,primarily,butresearchersbelievethatmencrymoreoftenthanwomenwhenitestopositiveevents.IwanttoadmitI,mabitofacryer.However,havingneverreallyexperienceddeathsinmylife,afewweeksagoIexperiencedwhatitmeanstoreally,truly,pourmyheartoutintears.See,mydog—and24/7panion—waskilledbyacarrightoutsidemyhouse.Beingawitnesstothispainfuleventleftmeinshockforagoodhour,butthenthefloodgatesopened.Overthenext48hours,Imighthavecried20times.OnceortwiceIcrouched蹲）onthefloorwithmyheadinmyhandsandtearsweretheonlyoutlet.ItissuggestedinthebookAdultCryingABiopsychosocialApproachthatthere'scertainpleasureincrying.Ithelpseasestresswhenthereisnootherwaytoexpressourselves.Inthosedaysaftermydog,sdeath,Irememberthinking,"I'vegottostopthiscrying”.Itfeltunmanly.Itfeltlikeasignofweakness.I,vesincerealisedthattearsareforeverybody;they,renotgenderspecific.Theyshowwehavesympathy,allowustogetridofstressandjustfeel.【解題導(dǎo)語】本文是一篇夾敘夾議文。作者的狗遭遇車禍，作者痛哭不已，傷心欲絕。后來作者意識到哭泣是釋放壓力的方法?！倦y句分析】However,havingneverreallyexperienceddeathsinmylife,afewweeksagoIexperiencedwhatitmeanstoreally,truly,pourmyheartoutintears.分析：該句為主從復(fù)合句。該句中whatitmeanstoreally,truly,pourmyheartoutintears為what弓［導(dǎo)的賓語從句；havingneverreallyexperienceddeathsinmylife為現(xiàn)在分詞短語作原因狀語。譯文：然而，我在生活中從來沒有真正體會過死亡，數(shù)周前的一次體驗讓我知道死亡真的意味著痛哭流涕和撕心裂肺的感覺。Whatdoesthefirstparagraphmainlytalkabout?Cryingisarawhumanemotion.Cryingisanemotionbeyondcontrol.Cryingisanemotionshowingsadness.Cryingisanemotionshowinghappiness.解析:A考查段落大意。通讀該段可知，該段第一句"Cryingisthesignoftherawestofhumanemotions”為該段的主題句。結(jié)合該段其他內(nèi)容可知，該段主要論述“哭泣是人類最自然的情感流露”，故A項正確。What,sthedifferencebetweenmenandwomenincryingaccordingtoDutchresearch?Theycryoverdifferentmatters.Theycryatdifferenttimesoflife.Womencrymoreoftenoverdeaths.Menaremorelikelytohavetearsofjoy.解析：D考查細(xì)節(jié)理解。由題干關(guān)鍵詞"Dutchresearch”定位至第二段，根據(jù)第二段的“匕仇researchersbelievethatmencrymoreoftenthanwomenwhenitestopositiveevents”可知，男女哭泣的區(qū)別是男子對于積極事物的哭泣頻率要比婦女高，故D項正確。Whatdidtheauthorthinkofhiscryingoverhisdog,sdeath?Asignofstrength.Asignofweakness.Behaviorofbeingwomanish.Awayofreducingemotionalstress.解析：D考查細(xì)節(jié)理解。根據(jù)第六段，尤其是最后一句"Theyshowwehavesympathy,allowustogetridofstressandjustfeel”可知，作者意識到哭泣是減輕情感壓力的方式，故D項正確。What'sthebesttitleforthetext?Men,nevercrylikewomenMen,it'sOKtocrysometimesCryingsolvespsychologicalproblemsCryingexplainsdifferencesbetweenmenandwomen解析：B考查標(biāo)題判斷。通讀全文內(nèi)容尤其是第一段第一句"Cryingisthesignoftherawestofhumanemotions”和本文最后一句"Theyshowwehavesympathy,allowustogetridofstressandjustfeel”可知，本文論述的中心是“哭泣是人類最自然的情感流露，是減輕情感壓力的方式”，據(jù)此可以判斷，B項最適合作文章標(biāo)題。C（xx?廣西重點高中二模）Peoplelovecellphones,whichiswhynineintenAmericansownone.Butdoesheavyuseofcellphonesposeariskofcancer?Thisquestionhascausedcontroversyformanyyears.Anewstudyinratsnowaugmentsthoseconcerns.Itsdatalinkedlongterm,intenseexposuretoradiationfromcellphoneswithallincreasedriskofcancerintheheartorbrain.Theresultshaveyettobeconfirmed,theauthorsnote.Indeed,althoughtheratstudyfoundalinkbetweencellphoneradiationandcancer,itoffersnocluestowhysuchalinkmightexist,notesJonathanSamet.HeteachespreventativemedicineanddirectstheInstituteforGlobalHealthattheUniversityofSouthernCaliforniainLosAngeles.Still,hecallsthenewstudy'sfindings“significant”.Theycouldleadtostudiesresearchinghowcellphoneradiationmightcausecancer,hesays.Phonesignalsarerelayedbetweencelltowersandcellphonesviaradiowaves.Thisradiofrequency—orRF—radiationisatypeknownasnonionizing（非電離的）.UnlikeXrays,nonionizingradiationdoesnotdepositenoughenergyintocellstoreleaseelectronsfromatomsormolecules,producingions.Soittends。befarlessharmfulthanionizingradiation,suchasXrays.Butthatdoesnotmeanradiowavesmightnotcauseharm.Inverylargedoses（量）thisradiationwillheatthebodyandcausetissuedamage.Butit,snotyetknownwhatmuchlowerRFlevelsmightdo,suchasthosefromcellphoneuse.Fiveyearsago,theWorldHealthOrganization,sInternationalAgencyforResearchonCancer,orIARC,concludedthatcellphoneuse“ispossiblycarcinogenic（致癌的）”.Itsconclusionwasbasedonwhatlittleresearchdatawasavailableatthat