陕西省礼泉县2016高考英语二轮复习阅读理解联练(3)

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1、陕西礼泉县2016高考英语阅读理解（二轮）联练（3）[2014高考英语湖北省襄阳市统考试题】Asingletumor（肿扌幫）canbemadeupofmanyseparatecancersncedingdiffercnttreatments,sayresearchers•AteamattheInstituteofCancerResearch,London,hasdevelopedanewtechniqueformeasuringthediversitywithinacancer.Theyshowed^ext

2、raordinary''differencesbetweencancerouscel1sandsaytraditionaldrugsmayfai1astheymaybeunabletoki11al1themutated（突变）tissue.Expertssaidthef'mdingswouldhavez，far-reachingeffects"fortreatments.Atumorstartsasasinglecell,whichacquiresmutationsandeventuallydividesun

3、controllably.Butthatisnottheendoftheprocess.Cancerouscellscontinuetomutateandbecomemoreaggressive,moveroundthebodyandresistdrugs.Thisprocessisdisorderedandresultsina"diverse"tumorcontainingcancerouscelIsthathavemutatedindifferentways."Thishashugeimplication

4、sformedicine、"researcherProfMelGreavestoldtheBBC.HisteamattheInstiluteofCancerResearchinvestigatedcancerdiversityinfivechildrenwithleukemia.Theycomparedmutationsinindividualcancerouscellswithaknowndatabaseofmutations.Theirresults,publishedinthejournalGenome

5、Research,showedpatientshadbetween2and10geneticallydistinctleukemia.ProfGreavessaid:〃Everypatientdoesn，thaveonecancer,theyhavemultiplecancers.Thisisreal1yatechnicaladvancetogetatthisextraordinarycomplexdiversity;ithelpsexplainwhywehavesuchdifficultywithadvan

6、ceddiseases."Scientistscomparecancerdiversitytoatree.Theinitialmutationsthetrunkwillbecommontoailcancercells.Butthenthetumorbranchesout.Itmeansatreatmentthattargetsone"branch"orsub-cloneofthecancermightslowthedisease,buttheywillneverstopit.ProfCharlesSwanto

7、n,whoresearchesdiversityattheUniversityCol1egeLondonCancerInstitute,toldtheBBC:〃Wecal1itpruning（修剪）thebranchesnotcuttingdownthetree;treatmentwi11removesomeofthesub-clones,butcuttingdownthetreeishardtodo.Thebottomlineisthatweneedtounderstandcancerdiversityto

8、limitfurtheradaptations,reducethepaceofevolutionandprolongtheactivityofdrugs."67.Whydothetraditionaldrugshavenoeffectsontreatmentofcancer?A.Theyareworseningthecondition.B.Theyareunabletokilltheconstant