M5Unit3WelcometotheunitTeachinggoals教学目标1.Enablethestudentstoknowsomethingaboutcloning,andgivetheirownopinionsaboutcloning.2.Helpthestudentslearnhowtodescribetheadvantagesanddisadvantagesofhumancloningwiththetargetlanguage.Teachingimportantpoints教学重点Talkaboutcloningandhumancloning.Teachingdifficultpoints教学难点Howtodescribetheadvantagesanddisadvantagesofhumancloning.Teachingmethods教学方法Discussionandspeaking.Teachingproceduresandways教学过程与方式StepILead-inWalkintotheclassroomwithasadface.T:Goodmorning,class.Ss:Goodmorning,MissWang.T:Howareyoutoday?S:Fine.Butyoulooksoupset,whathappened?T:Mypetcatdiedofsomeunknowndiseasethismorning,whichmakesmesosad.YouknowIlovehersomuchthatInearlycan’tlivewithouther.However,nothingcantakeherplaceinmymind,whatcanIdo?S:Whydon’tyouhaveonethatisexactlythesameasyoursbycloning?Ithinkit’stheonlywaytosolveyourproblem.T：What’sclone?S1:Acloneisacopy.S2:Cloningisoneofthemostpopulartechnologiesinthe20thcentury.T：Whatothertechnologiesdowehaveinrecentyears?S1:Maybethemostinfluentialtechnologyiscomputerscience,whichhascontributedalottooursocietyinmanyfields.Now,formostofus,wecan’tlivewithoutcomputers.S2:Everycoinhastwosides,whilewebenefitalotfromcomputertechnology,itdoesdoharmtousinsomedegree.Forexample,manypeoplegetcomputerdisease,andsomestudentsgiveupschoolingbecauseofbeingaddictedtocomputergames.S3:Air-conditioneriswidelyusedtoday.Wecanspendbothwinterandsummerwithoutworryingaboutbeingtoocoldortoohotbecausewecancontrolthetemperatureourselves.Butasaresult,ourenvironmentispollutedatthesametime;ourplanetisbecomingwarmerandwarmer,whichpartlyresultsfromourusingofair-conditioners.T:Youareright.Justnowyoumentionedcloning.Nowlet’sseesomepictures.Showthepicturesonthetextbookonthescreen.StepIIWelcometotheunitT:Herearesixpictures.Theyareallclones.MaybeallofyouarefamiliarwithDolly,aren’tyou?Ss:Yeah.T:WhereandwhenwasDollyborn?Isshestillalive?WhocangiveussomeinformationaboutDolly?S:DollythesheepwasbornonFebruary24,1997inEdinburghScotland.Shewasclonedfromacellofanothersheep.DollydiedinFebruary,2003,afterdevelopingaprogressivelungdisease.T:Doyouknowotherclonedanimals?S:Aclonedfrogfirstappearedintheworldin1952.In1962,atadpolewassuccessfullycloned.What’smore,itwasannouncedthathumanembryowassuccessfullyclonedinacompanyinAmericaonNovember25th,2001.T:Nowsupposeyou’vegraspedcloningtechnology,whatwouldyouliketoclone?Why?S1:I’dliketoclonedinosaurs,whichdisappearedseveralbillionyearsago.BecauseIwanttoreappeartheprosperityindinosaurs’timesandletourfuturegenerationhavetheopportunitytoseethegiantanimals.S2:Idon’tliketocloneanimalsinancienttimesbecauseIthinkitmeansnothing.Iwanttoclonewater.Asweallknow,waterisveryimportanttoourplanetandeventhewholeuniverse.However,withthedevelopmentofoursociety,theamountofwatercannotsatisfyourneeds.Besides,insomeareasintheworld,peopleevenhaven’tenoughwatertodrink.S3:IagreewithS2thatwaterisofgreatimportancetous.Butinmyopinion,foodismoreimportant.Ifwecansuccessfullyclonefood,wecansavepeopleinSouthAfricawhoaresufferingfromhunger;itwillbeofgreatbenefittotheworld.S4:It’safactthatourlivingenvironmentisbecomingworseandworse,soit’sourresponsibilitytoprotecttheenvironmentaroundus.Therefore,IwouldliketoclonethetropicrainforestinAmazon.IwillplaceitinSaharatopurifytheenvironmentandI’msurethatwouldbewonderful.S5:Thehumanorganwo...
