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
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
单项选择题
When was An American Dictionary of the English Language published
A．1817.
B．1807.
C．1828.
D．1824.
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