Leave the earth 　　Very strong 　　Very heavy 　　In space 　　Disappeared 　　Floated weightlessly 　　On the moon 　　Very light 　　The mass will be less 　　3.Summary

　　T: Good! I am sure you must know more about the gravity. Suppose you are asked to make a summary about the trip, will you try? You only need to fill the blacks and the first word has been given.

　　Last month I visited the moon with my friend. Before we left, I was told the force of gravity would change three times on our journey. Then we took off. As we left the earth, I became very heavy. Gradually the weight lessened. When I was in space, it disappeared. We floated weightlessly in the cabin and I cheered up. When I was on the moon, I was surprised to find out even walking needs lots of practice now that gravity changed. The returning of the earth was very frightening. We were amazed to watch fire break out on the outside of the ship.

　　Step4. Reading task

　　T：Great! But just imagine that the moon has great gravity, then what will happen?

　　S3: It will pull us.

　　T: Right, maybe when we are approaching it, we will be caught in it. So let's come to the black hole.

　　T: What are in the black hole?

　　S: A large circle of lights going round an empty space.

　　T: What is the circle of lights?

　　S: Large stars.

　　T: What is the empty space like?

　　S: It looks like a mouth needing to be fed.

　　T: How did they feel?

　　S: They watched in shock and amazement as a large sun suddenly disappeared into the hole.

　　T: So what did they decide to do?

　　S: They decided to turn the spaceship away from the hole .

　　T: What was happening?

　　S: not move--- jump and move around the edge of the outside of the hole--- pulling us slowly into its "mouth"--- go faster and faster.

　　T: What did the author feel?

S: feel sick, the watch moves slower and slower, my mouth dry, close my eyes.