人教版高中英语选修八课件：Unit 2 Reading(共80张PPT)

Reading Twins They are born naturally and identical in sex and appearance. A strawberry plant The new plants that grow from the runners are exact copies of the original plant. 一株草莓依靠它沿地“爬走”的匍匐茎, 一年内就能长出数百株草莓苗。 富贵竹插枝即活 The gardener should cut the plant, then the cutting produce another new plant. 1996 cloning sheeps 2001 cloning cattle 我国成功繁殖克隆兔 体形要比普通兔大许多 2002年5月 中旬成功地 繁殖了一只 胚胎细胞 克隆兔。 2002 cloning cats 2002年4月十六日美国第一头克隆牛“艾米”产下牛犊喜作妈咪。 2005 cloning dogs In pairs discuss what you understand about cloning. Then list the questions you want to find out. Share your lists with one another. Pre-reading 1. What is a clone? A clone is an animal or a plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it. 2. How is a clone produced？ The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man- made cloning) or letting the produce its own runners (natural cloning). The cloning of animals i