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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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
单项选择题
Home computers can be used for ______.
A．writing letters
B．playing games
C．doing business
D．all of the above
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