单项选择题
Home computers can be use for ______.
A．writing letters
B．playing games
C．doing business
D．all of the above
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单项选择题
Computer used to _____.
A．work rapidly
B．be large and expensive
C．be easy to use
D．be used for fun
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单项选择题
If the information give in this passage is correct, when we look at a star at night ______.
A．we will notice that it is not moving
B．we cannot tell whether or not it still exists
C．it will be brighter than the moon
D．it is four years that the light we can see will reach us
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