单项选择题

It is naive to expect that any society can resolve all the social problems it is faced with______.

A． for long
B． in and out
C．once for all
D． by nature
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单项选择题
One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.
A．cautiously
B． dutifully
C． faithfully
D．skillfully
单项选择题
He is too young to be able to _____ between right and wrong.
A．discard
B．discern
C．disperse
D．disregard
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