选修八第二单元课件 Cloning

Unit2Learningaims:*Tohaveagoodunderstandingofthereadingpassage;*Tobeabletodiscusssomeoftheissuesassociatedwithcloning.DollythesheepDollywasclonedwhiletheotherswerebornnaturally.HowdoesDollydifferfromothersheep?Naturalcloneisonethatoccursinanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatisproducedthroughhumanintervention(介入).Lookatthefollowingpicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-madeclones.DiscussionNaturalorman-madeclones?一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗。AstrawberryplantGrowingnewplantsTwinsDoyouwanttoknow:1.Whatisaclone?2.Howisacloneisproduced?3.Whatbenefitscanhumangainfromcloning?4.Whatproblemsmayarisewhenhumansarecloned?Reading:1.Scanthefollowingpassageandmatchtheparagraphwiththecorrectsentence.Para1A.TheproblemsofDollyPara2B.ThetwomajorusesandproceduresofcloningPara3C.TheimpactofcloningDollyPara4D.ThedefinitionofcloningPara5E.People’sreactiontocloningFast-reading(5minutes)2.Themainideaofthetextis______.A.Animalcloningisveryvaluableandcanbenefittheworld.B.Animalcloningcouldbemisusedbybadpeoplesoitmustbeforbidden.C.AnimalcloningiswelldevelopedbecauseDollythesheepwasborn.D.Animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.Fast-readingCareful-readingTask1:（para1-2)(3minutes)1.Whatiscloning?2.Whatarethetwomajorusesofcloning?3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Careful-readingTask1:（para1-2)1.Whatiscloning?Cloningisawayofmakinganexactcopyofanotheranimalorplant.Careful-readingTask1:（para1-2)2.Whatarethetwomajorusesofcloning?Thefirstuseistoproducecommercialquantitiesofplants.Thesecondistoresearchonnewplantsspeciesanddomedicalresearchonanimals.Careful-readingTask1:（para1-2)3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Becausecloningplantsisstraightforwardwhilecloninganimalsisverycomplicated.Careful-readingTask2:（para3-5)(4minutes)1.Itcanbeinferredfromthepassagethataclonedanimal_____.A.usuallylivesaslongastheoriginaloneB.usuallyliveslongerthantheoriginaloneC.usuallylivesshorterthantheoriginaloneD.isusuallyashealthyastheoriginalone推理判断题2.Whichofthefollowingisnotanadvantageofcloning?A.Cloningcanbeusedformedicalpurposes.B.Largequantitiesoffoodcanbeproducedbycloning.C.Cloningcanhelpkeepanimalsfrombecomingextinct.D.Famouspersonswhohavepassedawaycanbecloned.3.What’sthewriter’sattitudetowardscloning?A.SupportiveB.NeutralC.NegativeD.Subjective中立的objective客观的，公正的Detailed-readingTask1:Groupwork1(3minutes)DiscussingroupsandthenshowustheprocedureofthecloningofDollythesheep.克隆羊多莉的产生过程（动画）.swfTheprocedureofcloningDollythesheep:First,femalesheepAprovides_________,whosenucleusisremoved.FemalesheepBprovidesa_______cell,whosenucleuscontainsallthegenesneededtoproduceanewsheep.ThenthenucleusfromsheepBandtheeggcellfromsheepAarejoinedusing____________.Thecelldividesandgrowsintoan_______,whichisputintofemalesheepC.Soshebecomesthecarrieroftheclone.Finally,anewlamb,whichisthecloneofsheepB,isproduced.aneggcellsomaticelectricityembryoDetailed-readingTask2:Fillinthechartusingtheinformationfromthereadingpassage.(4minutes)ProblemsordangersofcloningAdvantagesofcloning1.Animalclonesmaydevelopthe_______ofolderanimals.1.Medicalcloningcouldbeusedto_____seriousillnessesinhumans.2.Animalclonesmaydie_______thanthedonoranimals.2.Gardenerscanusecloningtoproduce____________qualitiesplants.3._____leadersmaywanttoclonethemselves.3.Cloningisvaluableforresearchon___________________.4.Thereare________questionsofcloninghumanbeings.4.Cloningisvaluablefor___________________onanimals.Answers:ProblemsordangersofcloningAdvantagesofcloning1.Animalclonesmaydevelopthe_______ofolderanimals.2.Animalclonesmaydie_______thanthedonoranimals.1.Medicalcloningcouldbeusedto_____seriousillnessesinhumans.2.Gardenerscanusecloningtoproduce____________qualitiesplants.illnessescureyoungercommercialAnswers:ProblemsordangersofcloningAdvantagesofcloning3._____leadersmaywanttoclonethemselves.4.Thereare________questionsofcloninghumanbeings.3.Cloningisvaluableforresearchon___________________.4.Cloningisvaluablefor_________________onanimals.EvilnewplantspeciesmoralmedicalresearchChallengeyourself:(3minutes)阅读下面材料，在空白处填入适当的内容（不多于3个词）或括号内单词的正确形式。Cloningisawayofmaking______exactcopyofanotheranimalorplant.Cloningplantsisstraight-forward_________cloninganimalsiscomplicated.Cloninganimalsisadifficulttask_______________(undertake).Butatlastthedeterminationandpatienceofscientists___________(payoff)in1996withabreakthrough——thecloningofDollythesheep.Thefact_______Dollyseemedtodevelopnormallywasveryencouraging.Thencamethedisturbingnewsthatshehadbecomeseriouslyill.Cloningscientists______________(castdown)tofindthatDolly’sillnessesanwhiletoundertakepaidoffthatwerecastdownChallengeyourself:weremoreappropriatetoamuch________(old)animal.AltogetherDollylivedsixandahalfyears.Dolly’sappearanceraisedastormof___________(object)andhadagreatimpact_______themediaandpublicimagination.Itbecamecontroversial.Somegovernmentsbegantoreformtheirlegalsystemsandforbaderesearchintohumancloning,butothercountriescontinuedtoaccumulateevidenc