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
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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
单项选择题
What's the article mainly about
A．Air is a kind of gas.
B．Air is invisible.
C．Air is everywhere.
D．Air takes up space.
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