单项选择题


A．exact
B．some
C．large
D．enough
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单项选择题
Without air, there would be no______.
A．shelters
B．volcanoes
C．weather
D．springs
单项选择题
It is not widely known that______.
A．air is important to human being
B．air is important to the earth
C．air is necessary in many other ways
D．air is necessary to the animals
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