牛津譯林版高中英語必修五unit3scienceandnatureppt練習課件5(完整版)
【正文】 c oun t r ies ， som e s c ientist s ar e alr e ady p u sh in g ahead wit h r e se a r c h in or d e r t o p r o d u c e a c lon e d h u m an b aby . W hile c lo ning hum a n e m br y o s 3 ． 序數(shù)詞＋ ( 名詞 ) ＋不定式短語作定語 一位意大利人 S e ve r in o Antinori 宣稱他想成為第一個克隆人類的人。 c aus in g c h a n ge s in t h e ir ge n e r e at in g t h e se t r ans ge n ic ( 轉基因的 ) ani m als is a p r oc e ss t h at r e q u ir e s t r ial and e r r o r and se ve r al ge n e r at ion s of b r e e d in lo n in g t e c h n ologies m igh t r e d u c e t h e t im e n e e d e d t o m ake a t r ans ge n ic a n im al m odel. Unit 3 Science and nature S t e m c e ll s ar e r e sp ons ib le f or d e ve lop i n g ， m ai n t ain in g and r e p air in g t h e b ody t h r ough out li f e .Re se ar c h e r s ar e c u r r e n t l y look in g u p c lon in g as a w ay t o c r e a t e ge n e t ica ll y d e f in e d h u m an s t e m c e ll s f or r e se ar c h and m e d ica l p u r p ose s. Have you see n Jur assic Park? In t h is f e at u r e f il m ， sc ientist s u s e DN A p r e se r ve d f or t e n s of m il li ons of ye ar s t o c lon e d in osa u r w e r e ally clone din osa u r s? In t h e or y? Y e w e ll p r e se r ve d sou r c e of DN A f r o m t h e e xt in c t d in osau r ， a n d a c losely r e lat e d sp e c ies ， c u r r e n t ly li vin g ，t h at c oul d se r ve as a su r r ogat e ( 替代的 ) m ot h e r . Unit 3 Science and nature In r e ality? Pr obab ly n ot .It ’ s n ot li k e ly t h at d in osau r DN A c oul d su r vive u n d am age d f or su c h a lon g t ime .How e ve r ，sc ientist s h ave t r ied t o c lon e sp e c ies t h at b e c a m e e x t in c t m o r e r e c e n t ly ， u si n g DN A f r o m w e ll 173。 c lon in
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