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1、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 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 pro
2、duce 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,In pairs discuss what you understand about cloning. Then list the questions you want to find out. Share your lists wi
3、th 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 cuttin
4、gs (man- made 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 illnesse
5、s that ruin ones quality of life (such as Parkinsons disease or Alzheimers 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 want to clone dead children. People may want to c
6、lone their favourite pets.,1. What is the main topic? A. Cloning. B. Dolly the sheep . C. It will lead us to some places. 2. What is the writing style? A. Expositive (说明性的). B. Descriptive. C. Argumentative (议论性的).,Cloning: Where is it leading us?,A,A,Scanning,Learning tips: The passage is written i
7、n the expositive style. That is to say the text is in the third person and in factual and formal language. It gives different points of view and does not try to persuade the reader to make up his/her own mind.,3. Dolly the sheep _. A. looked exactly like the sheep that provides the egg. B. was the e
8、xact copy of the sheep that provides the nucleus. C. looked like the sheep that gave birth to it. D. had the characteristics of all three sheep.,B,4. It can be inferred from the passage that a cloned animal_. A. usually lives as long as the original one B. usually lives longer than the original one
9、C. usually dies earlier than the original one D. is usually as healthy as the original one,C,5. Which of the following is not an advantage of cloning? A. Cloning can be used for medical purposes. B. Large quantities of food can be produced by cloning. C. Cloning can help keep animals from becoming e
10、xtinct. D. Famous persons who have passed away can be cloned.,D,6. Which of the following is wrong? A. Cloned people could live forever. B. Cloned people may be killed at will for medical aid. C. A woman would have difficulty recognizing her real husband. D. Men will die out because a woman can give
11、 birth to a baby without a husband.,A,7. Which statement is NOT true? A. Cloning is something that has been developed quite recently. B. Twins that look exactly the same are originally from the same egg. C. Cloning is used by gardeners to make more money. D. Animal cloning is much more difficult tha
12、n plant cloning.,A,8. The cloning of Dolly the sheep succeeded because _. A. its easier to clone a sheep than other animals B. the scientists were determined and worked hard with patience C. the scientists were rewarded and got lots of money D. many other attempts to clone mammals failed,B,9. The la
13、mb is the clone of the cell from sheep because _. A. it provides the egg cell B. it gives birth to the lamb C. it provides the nucleus D. it is a female sheep 10. The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 9 D. 12,C,D,11. The main idea of the text is _ A. anima
14、l cloning is very valuable and can benefit the world. B. animal cloning could be misused by bad people so it must be forbidden. C. animal cloning is well developed because Dolly the sheep was born. D. animal cloning raised arguments and scientists are not sure about its future.,D,12. Which of the fo
15、llowing is NOT a problem or danger of cloning mentioned in the text? A. Evil leaders may want to clone themselves. B. Animal clones may develop the illness of older animals and may die younger than the donor animals. C. There are moral objections to cloning human beings. D. Too much cloning may lead
16、 to the destruction of the balance of nature.,D,13. We can infer from the last three paragraphs that _. A. the normal development of Dolly had no effect on the cloning of other species. B. Dollys serious disease and final death disturbed the whole world. C. Dolly successfully cloned a new lamb with the help of cloning scientists. D. there were arguments about animal cloni
