单项选择题

It's the first time that he has been to the United States, ______

A．isn't he
B．isn't it
C．hasn't he
D．hasn't it
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单项选择题
______ air is to man, so is water to fish.
A．Like
B．As
C．Since
D．For
单项选择题
There are three types of volcanoes; active volcanoes, dormant volcanoes and ______ volcanoes.
A．extinguished
B．extinct
C．distinct
D．instinctive
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