单项选择题

It seems that Mars ______.

A．may be inhabited by attractive Martians
B．may have some vegetable life
C．can have no life at all
D．may have both vegetable and animal life
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单项选择题
The meaning of the word rejuvenate ( Line 5, Para. 4) is close to ______ .
A．dead
B．leave
C．predict
D．activate
单项选择题
The opinion of the writer is that ______.
A．there may be other intelligent beings in the universe
B．there are other intelligent beings in the universe
C．people living on the earth are almost certainly the only intelligent beings in the universe
D．people living on the earth are definitely the only intelligent beings in the universe
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