What’s the article mainly about? In order to prove air takes up space, we can ______.

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问题 What’s the article mainly about?
In order to prove air takes up space, we can ______.

选项 A、stuff a dry handkerchief into the bottom of a glass
B、stuff a wet handkerchief into the bottom of a glass
C、stuff a dry handkerchief into the bottom of a jar
D、stuff a wet handkerchief into the bottom of a glass

答案A

解析 文章第二段中讲的两种证明方法都是把干的手帕放在一个玻璃杯中。
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