单项选择题

Life on the planet Jupiter is a possibility which ______.

A．does not exist
B．should not be ruled out
C．excites all scientists
D．has never been explored
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单项选择题
Life on other planets is possible ______.
A．when life-evoking conditions exist
B．only when their conditions match those of the earth
C．when the temperature is neither too hot nor too cold
D．when the atmosphere is not too dry
单项选择题
If you want to use Windows 2000, but your computer only has 64 MB, what will you have to do
A．Enlarge its RAM to at least 256 MB.
B．Put in good software in your computer.
C．Enlarge its RAM to at least 128 MB.
D．Have Windows NT to match it.
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