英语必修5译林牛津版unit 3同步复习第3课时导
学案 《课堂练习》一、单词应用 1. a recent a_________ by scientists that they have successfully c ___________the first human embryo has caused much debate and has shocked many people around the world . 2. on the one hand , some scientists p________ o_________（that if you clone an embryo , you can produce valuable t ____________and o ___________that could be used to save human lives . 3. on the other hand ,many people , including some scientists , disagree and fear that if m______________ ____________ __________ （干预）nature in this way, they may be on their way to producing a r_________________ monster.
