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单项选择题

"Stuff a dry handkerchief into the bottom of a glass."
The underlined word in this sentence means ______.

A．press tightly
B．believe to take
C．dip
D．put

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单项选择题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

单项选择题Since air is a gas, it has ______.

A．both room and shape
B．shape as well as weight
C．either shape or weight
D．no definite shape