单选题 In order to prove air takes up space, we can ______.

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

【正确答案】 A

【答案解析】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。