约9690字。有教学设计，同步讲解和适当练习。

　　Unit 4 Astronomy: The Science of The Stars
　　Teaching aims:
　　1. Enable students to improve their listening skills and reading ability.
　　2. Enable students to understand the development of gravity and how gravity affects
　　us in different times and places.
　　3. Arouse students’ interest to search for the mystery of space.
　　Emphasis:
　　1. Words and expressions: gravity, float, cheer up, now that, breat, etc
　　2. Astronomic knowledge like gravity and black hole.
　　Difficulties:
　　1. Help the students to understand the development of gravity.
　　2. Help the students to know how gravity influences us.
　　Teaching methods: skimming, scanning, discussing.
　　Teaching aids: a tape recorder, a projector and a computer.
　　Teaching procedures:
　　Period one Reading
　　Step 1. Presentation
　　T: Hello, everyone! Today we’ll come to Unit 4 Astronomy. Before that I have a question: Where do we come from? Or we can say: Who are our ancestors?
　　S1: Monkeys!
　　S2: Beijing Ren who lived many years ago.
　　S3: Reptiles.
　　S4: Mammals.
　　S5: Amphibians.
　　S6: Dinosaurs.
　　T: Very good! Can you put them in right order?
　　S7: Amphibians, Reptiles, Dinosaurs, Mammals, Beijing Ren.
　　T: Do you know what it was like before life appeared on earth?
　　S8: It was full of water, perhaps.
　　T: Before that, what was it like?
　　S9: Sorry, I don’t know.
　　T: Do you want to get more information? Today we’ll learn something about How Life Began on the Earth. Turn to Page 25. Let’s come to Warming up first.
　　Step 2. Warming up
　　1. Read the three questions, while the students listen and follow.
　　2. Give the Ss several minutes to discuss the questions.
　　3. Collect answers from the whole class.