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
单项选择题
We can know from the information given in the passage that the moon must be about ______.
A．300,000
B．two million
C．400,000
D．480 times 300,000
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