you name some scientists and introduce their main contributions?

　　S: Archimedes, who discovered that objects in water are lifted up by a force that helps them float.

　　S: Darwin wrote a book explaining how animals and plants developed as the environment changed. 

　　S: Madam Curie discovered radium. 

　　S: Stephen Hawking put forward a theory about black holes. 

　　S: Zhang heng invented the earliest instrument to tell people where earthquakes happened.

　　Ss: . . .

　　T: You did a good job and listed many scientists as well as their contributions. Today, we are going to learn about more scientists. 

　　Step 3 Listening (on Pages 5-6)

　　Task 1 Pre-listening

　　T: First let's enjoy the picture. What can you see?

　　S: President Jiang Zemin and an old man. 

　　T: President Jiang Zemin visited Qian Xuesen. 

　　T: What have you already known about Qian Xuesen?

　　S: He is a Chinese scientist, whose research mainly centers on Physics. 

　　S: He is honored as "Chinese Rocket Father". 

　　S: He has made great contributions to space travel in China. 

　　T: Good. You seem to have a good knowledge of him. Qian Xuesen is a famous scientist who has contributed much to the country's cause of science and technology. 

　　Task 2 First Listening

　　T: We are to listen to the material, which is about Qian Xuesen. Yu Ping is telling her friend Steve Smith about Qian Xuesen's life. If you were Yu Ping, what topics would you like to cover when introducing him?

　　S: The date when he was born and he died; the place where he was born, lived, studied and died; his family; his experience; his achievements; his contributions

　　T: Excellent. When we talk about and introduce a scientist, we usually describe these aspects. Now, listen carefully and tick out which topics are mentioned in the tape. 

　　(After listening, let them check the answers. )

　　Task 3 Second Listening

T: This time. You'll write down the answers to the five questions. Boys and girls,