4. All objects must go into the “black hole” when they are caught by its gravity. Yes They can be thrown far from the “black hole” by the energy in the “black hole”.

　　→Step 6 Consolidation

　　Ask students to go back to the two passages. Give them several minutes to be prepared to retell the whole story in their own words. Then ask as many students as possible to come to the front to tell the story.

　　→Step 7 Homework

　　1. Finish off the Workbook exercises.

　　2. Learn the useful new words and expressions in this part by heart.

　　3. Tell the story to your friends or family.

　　板书设计

　　Unit 4　Astronomy: the science of the stars

　　Extensive Reading

　　A VISIT TO THE MOON

　　1) Write down the three ways in which gravity changed for Li Yanping.

　　The way gravity changed

　　Left the earth The gravity became very strong.

　　In space The gravity disappeared.

　　On the moon The gravity became very light.

　　2) His weight changed three times, too. Now write them down.

　　How his weight changed

　　Left the earth He became very heavy.

　　In space He had no weight and could float around like a feather.

　　On the moon He was about one-sixth of his weight on the earth.

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