book 8 unit2 reading 课件

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1、Unit2CloningPeriod1Reading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AstrawberryplantTheplantproducesitsownrunners.AstemTakecuttingsfromgrowingplantstomakenewones.Theyareidenticalinsexandappearance,whoareproducedfromthesameoriginalegg.TwinsTheyarebornnaturallyand

2、identicalinsexandappearance.Cloningisawayofmakinganexact_____ofanotheranimalorplant.WhatisCloning?copyWhatisthedifferenceamongthem?NaturalcloneMan-madecloneclone我国成功繁殖克隆兔体形要比普通兔大许多2002年5月中旬成功地繁殖了一只胚胎细胞克隆兔。2002cloningcats克隆的荧光小猪(左)和正常小猪(右)Shewasc_____

3、_whiletheotherswerebornnaturally.Itistheexactcopyofanothersheepandthefirstclonedmammal.lonedDollythesheepLearningaims:1.Tograspthemainideaandmoredetails.2.Toimprovetheabilitytoanalyzethelonganddifficultsentences.3.Toarousetheinterestindevelopmentofsci

4、enceandtechnology.【课前预习】I.Phrases1.一直2.企图干某事3.取得成功4.从…中移除5.准备好6.为…提供7.从…中取出8.一方面，另一方面9.沮丧10.适合于…的1.allthetime2.attempttodosth3.payoff4.remove…from5.bereadyfor6.providesthforsb7.take…outof8.on(the)onehand,ontheotherhand9.becastdown10.beappropriateto11.

5、对…有重大影响12.支持13.一定做14.引起反对15.一阵16.开阔视野17.继续做18.实现野心19.不同意…20.观点11.haveagreatimpacton12.infavourof13.beboundto14.raiseobjections15.astormof16.openone’seyesto…17.continuetodo18.attainone’sambitions19.disagreewith20.pointofview1.Dollythesheep_____.A.looke

6、dexactlylikethesheepthatprovidestheegg.B.wastheexactcopyofthesheepthatprovidesthenucleus.C.lookedlikethesheepthatgavebirthtoit.D.hadthecharacteristicsofallthreesheep.＊II.Readthepassageandfinishtheexercises.2.Itcanbeinferredfromthepassagethataclonedan

7、imal_____.A.usuallylivesaslongastheoriginaloneB.usuallyliveslongerthantheoriginaloneC.usuallylivesshorterthantheoriginaloneD.isusuallyashealthyastheoriginalone＊3.Whichofthefollowingisnotanadvantageofcloning?A.Cloningcanbeusedformedicalpurposes.B.L

8、argequantitiesoffoodcanbeproducedbycloning.C.Cloningcanhelpkeepanimalsfrombecomingextinct.D.Famouspersonswhohavepassedawaycanbecloned.＊4.Theword“controversial”inpara4probablymeans____________.A.complicatedB.arguableC.importanttheauthordoesnots