2019-2020年高考英语二轮复习 阅读理解联练（3）

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1、2019-2020年高考英语二轮复习阅读理解联练（3）【xx高考英语湖北省襄阳市统考试题】Asingletumor（肿瘤）canbemadeupofmanyseparatecancersneedingdifferenttreatments,sayresearchers．AteamattheInstituteofCancerResearch,London,hasdevelopedanewtechniqueformeasuringthediversitywithinacancer．Theyshowed"extraordinary"differencesbetweencancerouscel

2、lsandsaytraditionaldrugsmayfailastheymaybeunabletokillallthemutated（突变）tissue．Expertssaidthef'mdingswouldhave"far-reachingeffects"fortreatments．Atumorstartsasasinglecell,whichacquiresmutationsandeventuallydividesuncontrollably．Butthatisnottheendoftheprocess．Cancerouscellscontinuetomutateandbeemo

3、reaggressive,moveroundthebodyandresistdrugs．Thisprocessisdisorderedandresultsina"diverse"tumorcontainingcancerouscellsthathavemutatedindifferentways．"Thishashugeimplicationsformedicine,"researcherProfMelGreavestoldtheBBC．HisteamattheInstituteofCancerResearchinvestigatedcancerdiversityinfivechild

4、renwithleukemia．Theyparedmutationsinindividualcancerouscellswithaknowndatabaseofmutations．Theirresults,publishedinthejournalGenomeResearch,showedpatientshadbetween2and10geneticallydistinctleukemia．ProfGreavessaid:"Everypatientdoesn'thaveonecancer,theyhavemultiplecancers．Thisisreallyatechnicaladv

5、ancetogetatthisextraordinaryplexdiversity;ithelpsexplainwhywehavesuchdifficultywithadvanceddiseases．"Scientistsparecancerdiversitytoatree．Theinitialmutationsthetrunkwillbemontoallcancercells．Butthenthetumorbranchesout．Itmeansatreatmentthattargetsone"branch"orsub-cloneofthecancermightslowthedisea

6、se,buttheywillneverstopit．ProfCharlesSwanton,whoresearchesdiversityattheUniversityCollegeLondonCancerInstitute,toldtheBBC:"Wecallitpruning（修剪）thebranchesnotcuttingdownthetree;treatmentwillremovesomeofthesub-clones,butcuttingdownthetreeishardtodo．Thebottomlineisthatweneedtounderstandcancerdiversi

7、tytolimitfurtheradaptations,reducethepaceofevolutionandprolongtheactivityofdrugs．"67．Whydothetraditionaldrugshavenoeffectsontreatmentofcancer？A．Theyareworseningthecondition．B．Theyareunabletokilltheconstantlychangingcancerous