单项选择题

The passage mainly talks about

A．the intelligent life of other planets
B．the development of intelligent life
C．the reasons why there may be other intelligent life in the universe
D．the history of human exploration of the outer space

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单项选择题If the radio waves had reached our planet one hundred years before, we would have______.

A．sent an immediate answer
B．sent an alarm against extraterrestrial attack
C．sent a short reply
D．sent no answer

单项选择题What can be inferred from the passage

A．Sooner or later, we can find intelligent life on stars.
B．Many planets have the same condition as our earth.
C．Life depends on the stars like the Sun.
D．We will certainly receive the messages sent to us by other intelligent beings.