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
Scientists generally hold that language has been so long in use that the length of time writing is known to cover is ______ in Comparison.
A．overwhelming
B．uninspiring
C．astounding
D．trilling
单项选择题
It is not considered ______ to pick one's teeth in public.
A．respectful
B．respected
C．respectable
D．respective
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