人教版选修8-unit2-using-languageppt

Welcome1.Doyouknowanythingaboutdinosaurs?2.HaveyoueverseenthefilmJurassicPark?Lead-inDinosaurs•DinosaursareadiversegroupofreptilesofthecladeDinosauria(进化恐龙属).TheyfirstappearedduringtheTriassic(三叠纪)period,between243and233millionyearsago,althoughtheexactoriginandtimingoftheevolutionofdinosaursisthesubjectofactiveresearch.TheybecamethedominantsaftertheTriassic–Jurassicextinctionevent201millionyearsago;theirdominancecontinuedthroughtheJurassicandCretaceous(白垩纪)periods.JurassicPark哈蒙德博士立志要建立一个非同寻常的公园:恐龙将是这个公园的主角。他把众多科学家收归旗下，利用琥珀里面困住的远古蚊子体内的血液，提取出恐龙的基因信息，利用这些信息培育繁殖恐龙。结果如愿以偿，他把努布拉岛建立成了一个恐龙公园，坚信可以从中赚取大钱。然而，科学家们则忧心忡忡。不幸的事情果然发生了。虽然公园有电脑系统管理，但却因为被员工破坏而造成了无法挽救的失控:所有的恐龙逃出了控制区，人们纷纷逃窜却逃不过恐龙的魔爪。恐龙自相残杀，人们亦死难无数，最后幸存者寥寥，只得四人逃出生天。努布拉岛上空弥漫着恐怖的气息。JurassicPark--afilmclipJurassicPark--afilmclipTeachingaims教学目标1.Understandthepassageandknowmoreaboutthecloningofdinosaursandtheproblem.（理解文章，了解恐龙的克隆及存在的问题。）(Readingability)2.Useyourownwordstoexplainthereasonswhythedinosaurscan’tbeclonedsuccessfully.(用自己的话来解释恐龙不能被成功克隆的原因)(Summaryability)3.Listthereasonstobringoneofthefourextinctanimalsbacktolife.(Writingability)(在四种灭绝动物选出最应该被克隆的动物并且列出原因)目标1understandthepassage建议：1.获取文章大致信息2.第一遍快读了解故事大意3.第二遍细读获取细节信息禁忌：1.一口气从头一字一句读到尾2.见到生词就查字典时间：5分钟Task1What’sthemainideaofeachparagraph?Para1ExplaintheimpossibilityofcloningdinosaursPara2Concludethatit’sjustadreamPara3IntroducethetopicofthepassageAnswer连线Readthetext,thentellwhetherthefollowingsentencesaretrueorfalse.(Studentscandiscussinpairs.)1.Scientistsarestillexperimentingwithcloningmammalsbecausetheythinkitcanmakemoney.2.Theanimalsthathavedisappearedfromtheearth,likedinosaurs,canbebroughtbacktolifethroughcloning.3.Ifwecancloneanyextinctanimals,weshouldletthemliveinazoo.Task2TrueorFalseGivesomereasonswhyitiseitherimpossibleorunsuitabletoclonedinosaurs.（onewordforeachreason）Reason1:Reason2:Reason3:DNADiversityHabitatTask3目标2useyourownwordstoexplainthereasonswhydinosaurscan’tbeclonedSomeimportantwordsandphrases•extinct灭绝的•strike…intoone’sheart使…刻骨铭心•fromtimetotime偶尔•bringbacktolife使复活•unsuitable不适合的•invain白费力气•diversity变化多样性•meandoingsth.意味着做某事•meantodo打算做某事•drawback缺点、不利•habitat栖息地•bebasedon以…为基础•InthefilmsJurassicPark，scientistsclonedseveralkindsof__1__dinosaurs,whichproveshowtheidea__2__(strike)amixtureoffearandexcitementintopeople’s__3___(heart).•However,__4__(bring)extinctanimalslikedinosaursbacktolifeis__5___(possible)andunsuitable.Therearemanyreasons:Firstly,welackperfectDNA.Secondly，alleffortsofcloningananimalwillbe_6__vainifthereisnotenoughdiversityinthegroup____7____(overcome)illnesses.Thirdly,itwouldbeunfairtocloneanyextinctanimalsifwecannotofferthem__8__(suit)habitat.•_9_(base)on__10__weknownow,thereturningofdinosaurstotheearthismerelyadream.extinctstruckheartsbringingimpossibleintoovercomesuitableBasedwhatGreatAuk(1844)Aurochs(1627)Dodobird(1755)Quagga(1883)Theseanimalsareextinctones.Whichoneshouldbebroughtbacktolife?Andwhy?Discusswithyourpartner.Theinformationonthetextbookmighthelpyou.Groupwork讨论建议:1.通读四种已灭绝动物的信息。2.挑选出自己认为最应该克隆的动物。3.仔细阅读该动物的相关信息，展开大胆联想，给出原因来阐述为什么这种动物最适合被克隆，能够带来什么样的好处。4.互相比较选择的动物，陈述各自的观点。讨论时间：5分钟自学目标3discussandlistthereasonsforwhichextinctanimalshouldbeclonedWritingLet’sbringthebacktolifeisthemostsuitableanimaltobebroughtbacktolife.Herearethereasons：Firstly,Secondly,Finally,SoIthinkwouldbethebestchoicetobebroughtbacktolife.WritingLet’sbringtheaurochsbacktolifeTheAurochsisthemostsuitableanimaltobebroughtbacktolife.Herearethereasons：Firstly,ithasthickhair,andwecanuseitshairtomakeclothes.Secondly,itslonghornscanbeusedfordecoration.Finally,it’sverylargeandstrong,thereforewecanmakeithelpfarmersploughthefield.SoIthinktheaurochswouldbethebestchoicetobebroughtbacktolife.WritingLet’sbringthedodobacktolifeThedodoisthemostsuitableanimaltobebroughtbacktolife.Herearethereasons：Firstly,it’sfriendlyandnotharmful,sowecankeepitaspetforchildren.Secondly,itslargeeggsandtastymeatcouldbedevelopedforfood.Finally,farmerscansellitsfeathersasdecoration.SoIthinkthedodowouldbethebestchoicetobebroughtbacktolife.WritingLet’sbringthegreataukbacktolifeThegreataukisthemostsuitableanimaltobebroughtbacktolife.Herearethereasons：Firstly,it’sfeathersdon’tabsorbwater,soit’susefulforprotectingclothesfromwater.Secondly,farmerscankeepitaschickentoearnmoney.Finally,itbecameextinctrecently,thereforeitsDNAisstillingoodcondition.SoIthinkthegreataukwouldbethebestchoicetobebroughtbacktolife.WritingLet’sbringthequaggabacktolifeThequaggaisthemostsuitableanimaltobebroughtbacktolife.Herearethereasons：Firstly,ithasbeautifulskinasazebra,sowecanuseitsskinasdecoration.Secondly,themeatisverytasty,andwewillhaveanotherdeliciousdish.Finally,itjustbecameextinctin1883,thereforewecaneasilygetitsperfectDNA.SoIthinkthequaggawouldbethebestchoicetobebroughtbacktolife.教学目标再现1.Understandthepassageandknowmoreaboutthecloningofdinosaursandtheproblem.（理解文章，了解恐龙的克隆及存在的问题。）2.Usetheirownwordstoexplainthereasonwhythedinosaurscan’tbeclonedsuccessfuland(用自己的话来解释恐龙不能被成功克隆的原因)3.Listthereasonstobringoneofthefourextinctanimalsbacktolife(在四种灭绝动物选出最应该被克隆的动物并且