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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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
单项选择题
Computers used to ______.
A．work rapidly
B．be large and expensive
C．be used for fun
D．be easy to use
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