4) Why do green plants help life to develop?

　　5) Why were mammals different from other animals?

　　3. Give students 4 minutes to read the passage a third time. Encourage them to try to deal with the language points in the context. Give them some explanations if necessary.

　　4. Listening and reading aloud

　　Let students listen to the tape. Remind them to pay attention to the pronunciation of each new word and the pauses within each sentence. Then ask them to read the text aloud to the tape.

　　→Step 5 Extension

　　Let students think about and discuss the following questions.

　　1. Do you believe that there is life on other planets? Why or why not?

　　2. Do you think it is possible that one day people will move their houses to other planets?

　　→Step 6 Closing down

　　1. Have students get prepared in 3 minutes or so and then ask them to retell how life began on the earth.

　　2. Ask as many students as possible to have a try in front of the class.

　　→Step 8 Homework

　　1. Go over the text and try to learn all the useful words and expressions in this part by heart.

　　2. Finish the exercises in Comprehending on Page 27.

　　板书设计

　　Unit 4　Astronomy: the science of the stars

　　Warming up and reading

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