广西扶绥县第二中学高中英语 unit2 cloning课件 新人教版选修8
28页1、,Cloning is a way of making an exact copy of another animal and plant.,What is cloning?,Who is famous in the cloning field?,Do you know something about Dolly?,When was she born? Is she man-made or natural cloning? When did she die? How long did she live? Why is she so famous?,Discussion,How do scientists clone a sheep?,A female sheep provides an egg cell. The nucleus is removed from the egg cell.,Cloning procedure,Step 1,A second female sheep provides a somatic cell. The nucleus is also taken ou
2、t.,Cloning procedure,Step 2,The egg cell from sheep A and the nucleus from sheep B are joined together using electricity.,Cloning procedure,Step 3,The combined cell divides and grows into an embryo.,Cloning procedure,Step 4,The embryo is then put into female sheep C. Finally a sheep D is cloned.,Cloning procedure,Step 5,sheep, goats, oxen, mice, pigs, cats, rabbits and so on.,What animals have been cloned?,Can you predict the future of cloning? What will is it leading us?,Unit 2,Cloning: Where I
3、s It Leading Us?,Reading Strategies,The better way to get the main idea is: A: Read the passage sentence by sentence and study the meaning of individual words or sentence if necessary. B: Try to locate a topic sentence in the first, the last or sometimes in the middle paragraph.,scan,skim,What is the topic sentence of the first paragraph What is the topic sentence of the last paragraph? However, scientists still wonder whether cloning will help or harm us and where is it leading us.,Cloning has
4、always been with us and is here to stay.,“ be here to stay” is an idiom , which means “ be accepted and used by most people”,1. The main idea of the text is_. A. animal 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,主旨大意,2. Which of the following statements about cloning is
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