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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单项选择题
If these trousers are too small, buy a bigger ______.
A．set
B．one
C．copy
D．pair
单项选择题
In how many volumes was An American Dictionary of the English Language published
A．One volume.
B．Two volumes.
C．Three volumes.
D．Four volumes.
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