Unit2Cloning话题导入教学

Unit2Cloning话题导入InthemovieJurassic

Park，scientistsclonedinosaursbyusingtheDNAthatwaspreservedformillionsofyears．However，thereistroublewhenthecloneddinosaursturnoutfiercerandsmarterthanexpected．Candinosaursreallybecloned？Theoretically，theycan；allthatwouldberequiredisDNAfromanextinctdinosaurandacurrentlylivingcloselyrelatedspecieswhichwouldactasasurrogatemother(代孕母亲)．Infact，thereiscontinuingresearchtoclonetheWoollyMammothbyextracting(提取)theDNAfromfrozenanimals．Actually，cloningisaphenomenonthatoccursnaturallyinawidevarietyofspecies．Wheneveryouseeapairofidenticaltwins，theyareexamplesofnature'sclones．Althoughscientistshavebeencloningcertainplantslikethecarrotquitesuccessfullyfordecades，attemptsatcloninganimalshavenotbeenassuccessful．However，theybeganlongbeforethebirthofDolly，thesheep—thefirstmammaltobesuccessfullycloned．Cloninghumansdoesgiverisetosomemisgivings，raisinganumberofmoralproblemsinvolved．Infact，thesocialinfluencesofproducinghumansartificiallywerebrilliantlyexploredinthefamousnovelBrave

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WorldbyAldousHuxley，andalsointhemovieThe

Island．Humancloningisbasicallyaboutcreatingagenetically(基因地)identicalcopyofapreviouslyexistingperson．Whywouldsomepeoplechoosetoclonehumanbeings？Well，generally，itcouldmakecouplesunabletohavebabieshavetheirownchildren．Replacingadeadchildisalsoanotherreasonwhysomepeoplehaveexpressedinterestinthetechnology．文章大意：本文是说明文。介绍了克隆的相关情况。1．Thepurposeofthefirstparagraphisto________．A．giveusanintroductiontoamovie

B．analysethepossibilityofcloningC．giveanintroductiontothetext D．tellustheimportanceofcloning答案：C从后文内容可知，第一段主要是为了引出下文。2．Inwhatwayishumancloninguseful？A．Itcanbringadeadpersonbacktolife． B．Itmakesitpossibletoreplaceadeadchild．C．Itcanhelpcuresomehumandiseases． D．Itcanhelppeoplehavemorehealthychildren．答案：B从最后一段可知，克隆人可以替代一个死了的孩子或者帮助不孕夫妻受孕。3．Whatdoestheunderlinedword“misgivings”inthethirdparagraphmean？A．Worries． B．Aims．C．Regulations． D．Principles．答案：A从该词后的raisinganumberofmoralproblemsinvolved可知，克隆人引起了很多担忧。4．Whatattitudedopeoplehavetowardshumancloning？A．Theythinkhumancloningisuseless． B．Theybelieveitcanhelphumansinmanyways．C．