高中英语 Unit2 Using Language课件 新人教版选修8.ppt

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1、Unit2cloningusinglanguageTheReturnoftheDinosaurs?Answerthefollowingquestions:1.HaveyoueverseenthefilmJurassicPark?Dopeoplelikethisfilm?Whatanimalsdoyouseeinthefilm?Aretheyrealdinosaurs?Warmingup(4ms)2.Doyoulikedinosaurs?Canyouseetheminourreallife?Why?Warmingup(4ms)3.Doyouthinkitispo

2、ssibletoclonedinosaurs?Ifnot,why?Ifyes,doyouthinkthat’sgoodforhumanbeings?Why?Warmingup(4ms)Readthetext,thentellthefollowingsentencesaretrueorfalse.(Studentscandiscussinpairs.)Scientistsarestillexperimentingwithcloningmammalsbecausetheythinkitcanmakemoney.Theanimalsthathavedisappear

3、edfromtheearth,likedinosaurs,canbebroughtbacktolifethroughcloning.Ifwecancloneanyextinctanimals,weshouldletthemliveinazoo.FFFReading--Iscanning(5ms)GivesomereasonswhyitiseitherimpossibleorunsuitabletocloneextinctanimalsReason1:Reason2:Reason3:YouneedperfectDNTThereisnotenoughdiversi

4、tyforclonedanimalstoovercomenewdiseases.Itwouldbeunfairtocloneanyextinctanimalsiftheywouldhavetoliveinazoo.AdvantageofdiversityDisadvantageofdiversityDiversityinagroupofclonedanimalsIfthereisanewillnesssomeoftheseanimalsmaydie,butotherswillsurviveandpassedontheabilitytoresistthatdis

5、easetotheirchildren.Theywouldallhavethesamearrangementofgenesandsotheymightalldieofthesamedisease.Reading--IIDetailreading(6ms)Readthetext,thenanswerthefollowingquestions.(Studentscandiscussinpairs.)Whyshould’tyoucloneanextinctanimalunlessthereisenoughdiversityinthegroup?Whyisitwron

6、gtocloneanextinctanimalifitwouldhavetoliveinazoo?Whycan’tyouclonetheDNAofanimalsthathavebeenextinctlongerthan10,000years?Whyshould’tyoucloneanextinctanimalunlessthereisenoughdiversityinthegroup?Therewillnotbeenoughgeneticvariation(遗传变异)inthegrouptobeabletoresistnewillnesses.2.Whyisi

7、twrongtocloneanextinctanimalifitwouldhavetoliveinazoo?Itisnotagoodideatocloneananimalthatwouldhavetoliveinazoobecauseitisnotasuitablehabitattodevelopandincreaseitsnumbers.Thezooisnotanaturalenvironmentforawildanimal.3.Whycan’tyouclonetheDNAofanimalsthathavebeenextinctlongerthan10,00

8、0years?TheDNAofanim