单项选择题

In the author' s eyes, the search for extra-terrestrial intelligence______.

A．is unnecessary
B．should be supported
C．is a waste of money
D．has not been done appropriately
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单项选择题
What does the word discount (Par
A．1 ) most probably mean according to the contextA. DoubtB. AcceptC. DischargeD. Disregard
单项选择题
Which of the following is NOT among the four possibilities of why we haven' t been visited
A．Forms of life on the other planets don't evolve to intelligent beings.
B．Earth is the only planet that contains life in the universe.
C．Life on the other planets destroys itself
D．Beings from outer space are too far away from us.
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