选修8第二单元usinglanguag

1、,选修 8,英语教学课件系列,Unit 2 Cloning,Using Language,The return of Dinosaurs,霸王龙 tyrannosaurus,剑龙 stegosaurs,雷龙 brontosaurus,翼龙pterodactyl,Look at the following pictures and think which film they are from.,Have you ever seen the film Jurassic Park? Why do people like this film? What animals do you see in the film? Are they real?,2. Do you like dinosaurs? Can you see them in our real life? Why? 3. Do you think it is possible to clone dinosaurs? If not, why? If yes, do you think thats good for human being

2、s? Why?,Arrange according to time.,5. research using the embryos of mice 4. first experimental clones of cows 8. first experimental clones of mice 7. work on the embryos of sheep and mice 2. Chinas first cloned twin calves 3. cloning of frogs 6. first clone of a mammal 1. cow gave birth to a bison,3 5 7 8 4 6 1 2,Skimming,Scientists are still experimenting with cloning mammals because they think it can make money. The animals that have disappeared from the earth, like dinosaurs, can be brought b

3、ack to life through cloning. If we can clone any extinct animals, we should let them live in a zoo.,F,F,F,True or False,1.The writer of the text _. A. is excited by the possibility of cloning fierce and extinct animals B. believes that extinct animals can be brought back to life by cloning C. thinks it impossible or unsuitable to clone extinct animals like dinosaurs D. dreams of dinosaurs returning to the earth,Choose the best answer.,C,2. The film Jurassic Park is popular because _ . A. people

4、are interested in the subject of cloning B. all the actors are dinosaurs C. it was directed by a scientist who clones dinosaurs D. it proves very interesting,A,3. Which of the following is true? A. Mice were cloned in 1981. B. Dolly the sheep was the first cloned animal. C. The name of the cloned cow is “Bison”. D. China was successful in cloning mammals.,D,4. The reasons why a group of cloned animals all die of the same illness do NOT include _. A. they have the same arrangement of genes B. the

5、re isnt enough diversity in the group for it to overcome illnesses C. the illness is a new one D. their arrangement of genes can not resist that new disease,C,5. We can infer from the text that _. A. scientists are experimenting to clone dinosaurs B. dinosaurs will never return to the earth C. cloned animals will only live in the zoo D. the DNA of dinosaurs can only survive 10 000 years,B,Read the text and answer the questions.,Why shouldnt you clone an extinct animal unless there is enough dive

6、rsity in the group?,There will not be enough genetic variation in the group to be able to resist new illnesses.,2. Why is it wrong to clone an extinct animal if it would live in a zoo?,It is not a good idea to clone an animal that would live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural environment for a wild animal.,3. Why cant you clone the DNA of animals that have been extinct longer than 10,000 years?,The DNA of animals more than 1

7、0,000 years old is not suitable for cloning, for it cant survive so long.,Give some reasons why it is either impossible or unsuitable to clone extinct animals.,Reason 1: Reason 2: Reason 3:,You need perfect DNA. There is not enough diversity for cloned animals to overcome new diseases. It would be unfair to clone any extinct animals if they would have to live in a zoo.,Diversity in a group of cloned animals,If there is a new illness, some of these animals may die, but others will survive and pas

8、sed on the ability to resist that disease to their children.,They would all have the same arrangement of genes and so they might all die of the same disease.,ordinary people,Reasons,diversity,suitable habitat,Conclusion,merely a dream,Careful Reading,Choose synonyms,1. It proves how the idea struck a mixture of fear and excitement into peoples hearts. A. Have on the brain B. Confused C. Droved people crazy D. Scared 2. From time to time people suggest that extinct animals A. There was a time whe

9、n B. Occasionally C. All the time D. Each time,A,B,3. People suggest that dinosaurs, can possibly be brought back to life. A. Kept up B. resist C. live on D. relived 4. The initial requirement is that you need perfect DNA. A. Most thankful B. most pressing C. most difficult D. most needed,D,D,5. All efforts of cloning an animal will be in vain if there is not enough diversity. A. go to waste B. useless C. helpless D. meaningless 6. Others will pass on the ability to resist that disease. A. oppose B. slide C. hire D. indicate,B,A,7. The chance of dinosaurs ever returning to the earth is merely a dream. A. only B. surely C. abruptly D. miserably,A,1. The popularity of the film Jurassic Park, in which a scientist clones several different kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into peoples heart. 电影侏

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