2020-2021学年高中英语Unit2CloningSectionⅠWarmingUpPre_reading&Reading教师用书教案新人教版选修8
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2020-12-19 19:06:38
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Unit2CloningUnit2Cloning当谈及克隆恐龙时仍旧有麻烦。某些植物像胡萝卜已经被克隆了，但是克隆动物的尝试却不那么成功。InthemovieJurassicPark，scientistsclonedinosaursbyusingtheDNAthatwaspreservedformillionsofyears.However，thereistroublewhenthecloneddinosaursturnoutfiercerandsmarterthanexpected.Candinosaursreallybecloned?Theoretically，theycan；allthatwouldberequiredisDNAfromanextinctdinosaurandacurrentlylivingcloselyrelatedspecieswhichcouldactasasurrogatesurrogatemother.Actually，cloningisaphenomenonthatoccursnaturallyinawidevarietyofspecies.Wheneveryouseeapairofidenticaltwins，theyareexamplesofnature'sclones.Althoughscientistshavebeencloningcertainplantslikethecarrotquitesuccessfullyfordecades，attemptsatcloninganimalshavenotbeenassuccessful.However，theybeganlongbeforethebirthofDolly，thesheep—thefirstmammalsuccessfullycloned.Cloninghumansdoesgiverisetosomemisgimisgivingsvings，raisinganumberofmoralproblemsinvolved.Infact，thesocialinfluencesofproducinghumansartificiallywerebrilliantlyexploredinthefamousnovelBraveNewWorldbyAldousHuxley，andal
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