高中英语 Unit 3 Science versus nature单元小结课件 牛津译林版必修5

Cloning:whereisitleadingus?Cloninghasalwaysbeenwithus.Itisawayofmakinganexactcopyofanotheranimalorplant.In1996,thescientistssucceededincloningDollythesheep.Ontheonehand,thewholescientificworldpaidcloseattentiontothegrowthofthefirstsuccessfulclone,Dollythesheep.Ingeneralthescientistswerepraisedfortheirwonderfulscientificbreakthrough.Ontheotherhand,Dollysappearanceraisedastormofobjections.Itsudde...