单选题 Teddy: Gravity is very important. Bob: What do you mean? Teddy: Gravity is the force that pulls everything down. Bob: 【D8】______ Teddy: If you pour water into a glass, the water goes down into the glass. Bob: 【D9】______ Teddy: Without gravity, the water would go up. Without gravity, we would go up, too. Bob: We would float into the sky like a balloon? 【D10】______ A. I'm not sure. B. Of course it does. C. That would be fun! D. Give some examples.

单选题 【D8】

单选题 【D9】

单选题 【D10】