Using LanguageⅡ教学目标

Book8 Unit2 The Return of the Dinosaurs?

Teaching aims教学目标

1.

Understand the passage and know more about the cloning of dinosaurs and the problem. 2. Use their own words to explain the reason why the dinosaurs can’t be cloned successful and

3. List the reasons to bring one of the four extinct animals back to life

Teaching procedure: Step1 Read the text, then tell the following sentences are true or false.

1.Scientists are still experimenting with cloning mammals because they think it can make money. 2.The animals that have disappeared from the earth, like dinosaurs, can be brought back to life through cloning. 3. If we can clone any extinct animals, we should let them live in a zoo.

Step 2 Give some reasons why it is either impossible or unsuitable to clone extinct animals. Reason 1:You need perfect DNT Reason 2:There is not enough diversity for cloned animals to overcome new diseases. Reason 3:It would be unfair to clone any extinct animals if they would have to live in a zoo.

Step 3 Ask the students to tell the advantages and disadvantages of diversity in a group. Advantage of diversity: If there is a new illness some of these animals may die ,but others will survive and passed on the ability to resist that disease to their children. Disadvantage of diversity: They would all have the same arrangement of genes and so they might all die of the same disease.

Step 4 Detail reading

Read the text, then answer the following questions.

1.

Why should’t you clone an extinct animal unless there is enough diversity in the group? 2.

Why is it wrong to clone an extinct animal if it would have to live in a zoo? 3.

Why can’t you clone the DNA of animals that have been extinct longer than 10,000 years? 4.

Why should’t you clone an extinct animal unless there is enough diversity in the group? Homework Finish Ex. 2, Page16;

Ex. 3-4, Page17.