1. Leading in What would you restore if you had a chance?

3. Skimming Read the text quickly to get the main idea of each paragraph.

4. Para. 1 Para. 2 Para. 3 But in fact we are a long way from being able to clone extinct animals. ( It is impossible to clone extinct animals.) Unfortunately, with what we know now, this is either impossible or unsuitable. There are many reasons. ( why it is impossible to clone extinct animals.) So the chance of dinosaurs ever returning to the earth is merely a dream. (It is impossible to clone dinosaurs. / for dinosaurs to return to the earth.)

5. Scanning Answer the comprehending questions on Page 26, Jichu. Keys: C A D C B What does the word “ones” mean in Para. 1? A. film makers B. clones C. people D. fierce and extinct wild animals ∨

6. Language study Understand & translate The possibility of cloning fierce and extinct wild animals has always excited film makers. And they are not the only ones! The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people's hearts.

7. Language study Understand & translate The possibility of cloning fierce and extinct wild animals has always excited film makers. And they are not the only ones! The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people's hearts.

8. Language study Why are scientists still experimenting with cloning mammals? The cloning of mammals is still a new science. What was done in this new science in 1981? The first experimental clones of mice were made. What happened in this new science in 2000? A cow gave birth to a bison.

9. Language study Why is it impossible or unsuitable to clone extinct animals like dinosaurs? The initial requirement is to have perfect DAN to give information for how cells are to grow. It is in vain if there is not enough diversity in the group to overcome illnesses because a group of cloned animals would have the same arrangement of genes and so might die of the same illness. It would be unfair to clone any extinct animals if they were to live in a zoo rather than lead a natural life in a suitable habitat.

10. Auroch (1627) Great Auk (1844) Dodo bird (1755) Quagga (1883) Which extinct animals are worth restoring by means of cloning? discussing

11. Writing Write a letter to a science magazine to give your reasons to persuade them to restore the extinct animal you have chosen.

12. Summary It is impossible to clone extinct animals. The initial requirement is to have perfect DAN to give information for how cells are to grow. It is in vain if there is not enough diversity in the group to overcome illnesses because a group of cloned animals would have the same arrangement of genes and so might die of the same illness. Besides, it would be unfair to clone any extinct animals if they were to live in a zoo rather than lead a natural life in a suitable habitat. So there is no chance for dinosaurs to return to the earth. ____________ _______________ _________________ ___________________________ _______________ _____________________________ _____________ ____ _

13. Homework Read the text. Finish the test exercise.