单项选择题

We can infer from the passage that the appearance of "immortal" life is ______.

A．only a matter of time
B．far from certain
C．just an illusion
D．a fading hope
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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
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
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