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