题目
A: What are you doing, Linda?
B: 【1】
A: An experiment? What is it about?
B: A theory about air pressure. I fill a jar with water. I cover the top with a piece of cardboard. Then, I turn the jar upside down.【2】
A: I think we can’t do it inside. I’m sure that the floor will get wet.
B: No,【3】
A: Why? The water won’t stay in the jar.
B:【4】 .
A: Great!【5】 .
知识点：Unit 3 Robot章节：未标注