从方框中选择适当的句子完成对话。
A: What are you doing, Linda?
B: 26
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. 27
A: I think we can’t do it inside. I’m sure that the floor will get wet.
B: No, 28
A: Why? The water won’t stay in the jar.
B: 29 .
A: Great! 30 .
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