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
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
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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