S1：Dinosaurs and dodos have died out.They lived on the earth many years ago.

　　S2：The Milu deer still live on the earth，there are some in China.

　　T：Yes.Do you want to know more about them?Let's come to the short passage on Page 30.

　　Step 3 Reading

　　Task 1 Prediction

　　T：Can you guess what the reasons might be for the disappearance of the dinosaurs and dodos?

　　S1：Because the weather changed much at that time.

　　S2：Because the human beings killed them.

　　Task 2 Fast reading for the main idea

　　T：Maybe you are right.Let's read the text.After reading，you should find out the main idea of the text.One minute for you to read.

　　（One minute later.）

T：You may talk about it with your partner and now