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．dutifully
B．cautiously
C．faithfully
D．skillfully
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单项选择题
Some scientists are dubious of the claim mat organisms______with age as an inevitable outcome of living.
A．depress
B．default
C．degrade
D．deteriorate
单项选择题
Having a(n)______attitude towards people with different ideas is an indication that one has been well educated.
A．tolerant
B．analytical
C．bearable
D．elastic
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