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1、Unit2CloningTheFirstPeriodWarmingupandReadingTeachinggoals1.Enablethestudentstodescribecloning:Whatistheadvantagesofcloning？2.Helpthestudentsanalyzethewritingtechniquesofthearticle.TeachingproceduresStepIWarmingup一:Youcanimaginehowrapidlythemodernscienceandtechnologydevelop.Ithinkmostofyoumustk
2、nowsomethingaboutspacetraveling,submarineexploration,robot,maglevtrain,geneengineeringetc.Butinrecentyears,ahottopic,cloningisoftenmentioned,especiallywhenthecloningDollythesheepappeared.YoumayhavefirstheardofcloningwhenDollytheSheepshoweduponthescenein1997.Cloningtechnologieshavebeenaroundform
3、uchlongerthanDolly,though.Firstthingsfirst,whatiscloningandaclone?Thedictionarysayscloningisthetechniqueofproducingageneticallyidenticalduplicateofanorganism.Acloneissaidtobealldescendantsderivedasexuallyfromasingleindividual,asbycuttings,bulbs,byfission,bymitosis,orbyparthenogenesisreproductio
4、n.Infact,inourdailylife,thishappensoften.Forexample,gardenerstakecuttingsfromgrowingplantstomakenewones.Youoftenseethatyourmotherpicksasmallbranchfromagrowingplanttomakeanewone.Ifshelikesthiskindofflowers,shecandocloning.Cloningalsohappensinanimalsorhumanbeingswhentwinsidenticalinsexandappearan
5、ceareproducedfromthesameoriginalegg.Discussion1.Doyouwanttobeclonedornot?Why?2.Canyoutellmetheadvantagesofcloning?3.Andwhatisthedisadvantage?二：LookatpicturesLookatthepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman–made.Thenexplainhowtheydiffer.StepIIPre-reading（Beforeclass,askthes
6、tudentstosearchforsomeinformationaboutthistopic.）Nowshowyourquestionsonthescreen,andthenletthemdiscusswitheachother.Nowpleaseworkinpairsanddiscussaboutcloning.Thenlistthequestionsyouwanttofindout.Shareyourlistwithyourpartner.Questionsaboutcloning:1.Whatisaclone?2.Howisacloneproduced?3.Whatbenef
7、itscanhumansgainfromcloning?4.Whatproblemsmayarisewhenhumansarecloned?5.Shouldweclonehuman?6.Couldcloningreplacesexasthemeansofcreatingnewhumanlife?7.Couldaparentcloneachildwhoisdyingofaterminalillness?Suggestedanswers:1.Itisawayo
