单项选择题

Without air, there would be no______.

A．shelters
B．volcanoes
C．weather
D．springs
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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
单项选择题
Without air protection, the sun's rays______.
A．will become very cold
B．will do good to human beings
C．will become hot
D．will do harm to human beings
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