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(人教版)高中英语选修8课件:Unit+2++Cloning+Reading(共80张PPT)


高二人教新课标版选修八 Unit 2 Cloning 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 t

he 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16日 美国第一头克 隆牛“艾米” 产下牛犊喜作 妈咪。 2005 cloning dogs Pre-reading In pairs discuss what you understand about cloning. Then list the questions you want to find out. Share your lists with one another. 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 (manmade cloning) or letting the plant produce its own runners (natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading. 3. What benefits can humans gain from cloning? Medical cloning can help cure serious illnesses that ruin one’s quality of life (such as Parkinson’s disease or Alzheimer’s disease). It can help infertile people have babies. 4. What problems may arise when humans are cloned? ? People may want to clone themselves so they can live forever. ? People may w

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