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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
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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.

单项选择题In recent years, computer are being made ______.

A．smaller and cheaper
B．larger and more expensive
C．more difficult to use
D．to work more slowly