牛津譯林版高中英語必修五unit3scienceandnatureppt練習課件5(已修改)
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【正文】 Unit 3 Science and nature 大家對 “ 克隆 ” 這個名詞已經(jīng)不陌生了 ， 可是人們?yōu)槭裁匆寺∧兀靠寺〕隽硗庖粋€自己 ， 為你做作業(yè) ， 而你去和朋友打球或玩游戲嗎？那就讀一讀下面這篇文章吧！ Unit 3 Science and nature Re se ar c h advan c e s ove r t h e p ast d e c ade have t old u s tha t ， w ith a li t t le w or k ， w e h u m ans c an clone j u st a b out anythi n g w e w ant ，f r om f r ogs t o m onk e ys and p r obab ly e ve n ourse lve s! So ， w e c an clone t h in gs ， b u t w h y? Let ’ s look at som e of t h e r e ason s. Unit 3 Science and nature Of all t h e r e ason s ， c lon in g f or m e d ica l p u r p ose s is t h e m ost p ot e n t ial t o b e n e f it la r ge n u m b e r s of p e opl e .M u c h of w h at r e se a r c h e r s lea r n abou t h u m an d isease c o m e s f r om stud yin g ani m al m odels su c h as m ice .Of t e n ， ani m al m odels ar e ge n e t ica ll y e n gin e e r e d t o c ar r y d isease 173。 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(zhuǎn)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
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