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
The author thinks that______.
A．it is impossible that we encounter some alien form of life
B．life only exists on Earth
C．it is likely that we' ll encounter some alien form of life
D．beings from outer space will never visit the earth
单项选择题
What does the word discount (Para. 1 ) most probably mean according to the context
A．Doubt
B．Accept
C．Discharge
D．Disregard
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