广西扶绥县第二中学高中英语 unit2 cloning课件 新人教版选修8

,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 out.,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 Is 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 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 NOT true according to text? 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 than plant cloning.,细枝末节,3. 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,4.Which of the following is not an advantage of cloning? Cloning can be used for medical purposes. Large quantities of food can be produced by cloning. Cloning can help keep animals from becoming extinct. Famous persons who have passed away can be cloned.,5. The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 9 D. 12,推理判断,When we come across questions that require us to infer , imply or conclude from the passage , remember to :_ A. infer unknown facts from known facts B. use the direct information from the text,Reading III Detail reading ( 8ms ) Fill in the blank using the information from the text.,Cloning not only happens in _, but also in _. Cloning has two _ _. First , it can help gardeners produce_ _ _ _. Second, it is valuable for research on _ _ _and for medical research on _. Cloning plants is _ while cloning animals is very _.,plants,animals,major uses,commercial,quantities of plants,new,plant species,animals,straightforward,complicated,3.The whole scientific world _ _ _ of Dolly. At first, the fact that Dolly seemed develop _was very _ . Later, cloning scientists were _ _ to find that Dollys _ were more _to a much older animal. 4. Cloning became _.Using cloning to _ _ _ _.,followed the progress,normally,encouraging,cast down,illnesses,appropriate,controversial,Cure serious illnesses,What do you think is the writers point of view in this reading passage? Is it in favour of cloning or against it?,I think the writer is _ because _,impartial /neutral,he/she does not state any personal opinion about cloning.,A,B,A: I think cloning is good for us. Because,B: I think cloning is bad for us. Because,Is cloning good or bad for us ? Write down your idea,Describe the picture in your own words,What is your opinion of cloning human?,Pair Work,Watch the movie and discuss,Write a passage titled Is cloning good or bad? Your passage should include the following： 1)What is cloning