Teddy: Gravity is very important. Bob: What do you mean? Teddy: Gravity is the force that pulls everything down. Bob: 【D8】______

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问题 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.
【D9】

选项 A、 
B、 
C、 
D、 

答案B

解析
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