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学案（第1课时知识复习） unit3《science and nature》（译林牛津版必修5 ）一、 知识复习1 1. on the other hand, some scientists point out that if you clone an embryo, you can produce valuable human tissues---such as bone or lung tissue—that could be used to save human lives. on the other hand, many people, including some scientists, disagree and are afraid that, if mankind toys with nature in this way, we may be on our way to producing a real-life frankenstein’s monster. (1) on (the) one
