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ID:56416348
大小:3.23 MB
页数:30页
时间:2020-06-17
《选修八第二单元课件 Cloning.ppt》由会员上传分享,免费在线阅读,更多相关内容在PPT专区-天天文库。
1、cloningUnit2Learningaims:*Tohaveagoodunderstandingofthereadingpassage;*Tobeabletodiscusssomeoftheissuesassociatedwithcloning.DollythesheepDollywasclonedwhiletheotherswerebornnaturally.HowdoesDollydifferfromothersheep?man-madecloneNaturalcloneisonethatoccursinanaturalformofcloningwitho
2、uthumanhelp.Man-madecloneisonethatisproducedthroughhumanintervention(介入).Lookatthefollowingpicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-madeclones.DiscussionNaturalorman-madeclones?一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗。NaturalcloneAstrawberryplantGrowingnewplantsman-madeclone
3、NaturalcloneTwinsDoyouwanttoknow:Whatisaclone?Howisacloneisproduced?Whatbenefitscanhumangainfromcloning?Whatproblemsmayarisewhenhumansarecloned?Reading:cloning:whereisitleadingus?1.Scanthefollowingpassageandmatchtheparagraphwiththecorrectsentence.Para1A.TheproblemsofDollyPara2B.Thetwoma
4、jorusesandproceduresofcloningPara3C.TheimpactofcloningDollyPara4D.ThedefinitionofcloningPara5E.People’sreactiontocloningFast-reading(5minutes)2.Themainideaofthetextis______.A.Animalcloningisveryvaluableandcanbenefittheworld.B.Animalcloningcouldbemisusedbybadpeoplesoitmustbeforbidden.C.A
5、nimalcloningiswelldevelopedbecauseDollythesheepwasborn.D.Animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.Fast-readingCareful-readingTask1:(para1-2)(3minutes)1.Whatiscloning?2.Whatarethetwomajorusesofcloning?3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Car
6、eful-readingTask1:(para1-2)Whatiscloning?Cloningisawayofmakinganexactcopyofanotheranimalorplant.Careful-readingTask1:(para1-2)2.Whatarethetwomajorusesofcloning?Thefirstuseistoproducecommercialquantitiesofplants.Thesecondistoresearchonnewplantsspeciesanddomedicalresearchonanimals.Careful
7、-readingTask1:(para1-2)3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Becausecloningplantsisstraightforwardwhilecloninganimalsisverycomplicated.Careful-readingTask2:(para3-5)(4minutes)1.Itcanbeinferredfromthepassagethataclonedanimal_____.usuallylivesaslongastheorigi
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