人教版选修八：Unit2+Cloning+Reading+and+writing+

英语学习讲义英语学习讲义好好努力梦想终会实现 好好努力梦想终会实现 Unit2CloningPeriod5UsingLanguage:ReadingandwritingTeachingaims:Improvethestudents'readingability(skimmingandscanning).Enablethestudentstograsptheusefulwordsandexpressions.Practicethestudents'writing.Teachingimportantanddifficultpoints:Improvethestudents'readingability(skimmingandscanning).enablethestudentstograsptheusefulwordsandexpressions.Teachingmethods:Reading,discussion,enjoying.Teachingprocedures:Step1ShowsomepicturestothestudentstomakethemseethehistoryofpeoplescloningStep2EnjoysomepicturesofdifferentkindsofdinasoursStep3Readthepassageandanswerthequestions:Whyshouldn'youcloneanextinctanimalunlessthereisenoughdiversityinthegroup?Whyisitwrongtocloneanextinctanimalifitwouldliveinazoo?Answers:TherewillnotbeenoughgeneticvariationinthegrouptobeabletoresistnewillnessesItisnotagoodideatocloneananimalthatwouldhavetoliveinazoobecauseitisnotasuitablehabitattodevelopandincreaseitsnumbers.ThezooisnotanaturalenvironmentforawildanimalStep4ReadingcomprehensionReadthepassageagain,andchoosethecorrectanswers.Thewriterofthetextisexcitedbythepossibilityofcloningfierceandextinctanimals.believesthatextinctanimalscanbebroughtbacktolifebycloning.thinksitimpossibleorunsuitabletocloneextinctanimalslikedinosaurs.dreamsofdinosaursreturningtotheearth.ThefilmJurassicParkispopularbecause.peopleareinterestedinthesubjectofcloningalltheactorsaredinosaursitwasdirectedbyascientistwhoclonesdinosaursitprovesveryinterestingThereasonswhyagroupofclonedanimalsalldieofthesameillnessdoNOTinclude.theyhavethesamearrangementofgenesthereisn'tenoughdiversityinthegroupforittoovercomeillnessestheillnessisanewonetheirarrangementofgenescannotresistthatnewdiseaseWecaninferfromthetextthatscientistsareexperimentingtoclonedinosaursdinosaurswillneverreturntotheearthclonedanimalswillonlyliveinthezootheDNAofdinosaurscanonlysurvive10,000yearStep5Languagepoints.fromtimetotime有时，间或，偶尔=occasionally=nowandthen=sometimesHewentfishingfromtimetotime.他不时去钓鱼。.bring…backtolife使复生我们不能使这只狗复生。Wecantbringthedogbacktolife.如果人能够复生，世界将是什么样子呢？Ifpeoplecanbebroughtbacktolife,whatwilltheworldbe?.resistn.防染剂;抗蚀剂vi.抵抗，反抗，抗拒Iftheenemycontinuetoresist,wipethemout.如果敌人继续抵抗，就把他们消灭掉。vt..抵［反,对］抗Thenationwasunabletoresisttheinvasion.该国无力抵抗侵略。

Ahealthybodyresistsdisease.健康的身体能抵御疾病。.阻，耐（得住）.阻挡，抵制，抗拒，违背；［常用于否定句］忍住resistaggression抵抗侵略Iwasunabletoresistlaughing.我忍不住笑了。resisttemptation不受引诱resistheat耐热Ican'tresistthetemptation.我不能抵挡诱惑。.merely=onlyadv.仅仅（地），只不过，只是Imerelyaskedhisname.我只不过问问他的名字。Thisismerelythebeginning.这仅仅是个开头。notmerely...butalso不仅...而且...Sheismerelyachild.她只是个孩子。Step6DiscussionNowinpairsdiscusswhichextinctanimalsdescribedbelowareworthrestoringbymeansofcloning.Auroch(1627) Dodobird(1755)GreatAuk(1844)Quagga(1883)Step7Writing:makealistofyourreasonsforrestoringit.Writeashortreportgivingyour