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1、课时跟踪检测（一）Introduction&Reading—Pre-reading阅读理解ALastspring,IworkedinWashingtonD．C.ThereIvisitedFord'sTheaterandlookedatAbrahamLincoln'simpressivememorial(纪念碑)．ButattheNationalMuseumofHealthandMedicine,mynosecouldalmosttouchpiecesofthemanhimself:alockofhishair,piecesofhisskullandahandkerchief
2、withhisbloodonit.AsIstoodthere,Iwondered,“CouldwecloneAbrahamLincoln？”SinceDollythesheepwasclonedin1996,scientistshaveclonedmammalsfrommicetomules,butwe'veneverclonedahuman.Maybeit'sahorribledesire,butifweeverdecidedtoclonesomeone,IwouldvoteforAbrahamLincoln.AfterAbrahamLincolnwasshot,hisd
3、octorsandfriendscollectedbitsofhisskullandbloodypiecesofclothforautopsy(尸检).Locksofhishairwerepassedaroundlikeholyrelics.LongbeforetheyknewaboutDNA,thesepiecesofLincolnrepresentedtheessence(本质)oftheman.Whilewedohavehisgenes,weprobablydon'thavetheentireDNAsequenceneededforcloning.SherylBern
4、auer,labsupervisorfortheDNASequencingFacilityatUCDavis,saidthatwhencellsdieovertime,theDNAbecomeslessuseful.TheDNAinLincoln's145yearoldbloodstainsandhairisprobablyfutileforcloning.“ThehairitselfwouldbeveryhardtogettheentireDNAsequencefromunlessyouhaveacompletefollicle(毛囊)，”Bernauersaid.Wed
5、on'thaveanyofLincoln'sfollicles,sothat'sanogo.Still,it'sinterestingtothinkabouthowthedevelopmentofcloninghaschangedthewayweviewhumanremains.Humanshavealwayshonoredthedead,butnowweknowthat—inDNAatleast—partofthedeadliveson.语篇解读：作者思考了我们是否可以克隆出AbrahamLincoln的问题，但目前来说条件不允许。1．AttheNationalMuseu
6、mofHealthandMedicine,theauthor________.A．touchedpiecesofAbrahamLincolnB．lookedatAbrahamLincoln'smemorialC．wasaskedaboutcloningAbrahamLincolnD．sawsomethingbelongingtoAbrahamLincoln'sbody解析：选D 细节理解题。根据第一段的“ButattheNationalMuseumofHealthandMedicine...alockofhishair,piecesofhisskullandahandker
7、chiefwithhisbloodonit.”可知，作者在那里看到了一些林肯身上的东西。2．WhywerebitsofAbrahamLincoln'sskullandbloodypiecesofclothcollected?A．Torememberhim.B．Tolearnabouthisdeath.C．Tostoreforcloninginthefuture.D．Tobepassedaroundlikesaintlyrelics.解析：选B 推理判断题。根据第三段的“hisdoctorsandfriendscol
