unit3Welcome高二英语课件
日期：2010-04-06 04:54
namedCcItwascreatedusingacelltakenfromanadultcat，wasbornonMay4HeiscreatedfromacellofhisbrotherkittenRainbowTheworldsfirstclonedcat，Unit3ScienceversusnatureWelcometotheunitLead-inScienceisdevelopingsofastthatsometimesitisbeyondourimaginationManhascreatedmanythingssuchasRadios，kitten，TVsetsandsoonWhatelsehasbeencreatedbyman?Couldyougiveussomeexamples?ExplanationClone:produceanexactcopyofananimaloraplantfromitsowncellsDollytheworldsfirstclonedadultanimalThescientistswhoclonedDollyaretostopexperimentsinvolvinggeneticallymodifyingpigsforhumanorgantransplantsbecauseofconcernsthatdeadlynewdiseasescouldbepassedontopeoplePicture-talk Theworld‘sfirstclonedmule(驴)，RainbowTheworldsfirstclonedpigswereproducedfromanadultfemalepigusingadifferenttechniquefromtheonethatproducedDollyFiveclonedpigsApairofnew-bornclonedcalvesTheyarethesecondadult-animalclonesresearchcentresaidthenewtechniquewouldbeusedtobreedbettercattlestrainswithhigher-qu，
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