填空题

56（）

【参考答案】

B
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单项选择题
21（）

A．under the thumb
B．below the hands
C．subject to the palm
D．in the fingers
单项选择题
According to the first paragraph, the atmosphere is essential to man in that
A．it protects him against the harmful rays from space
B．it provides sufficient light for plant growth
C．it supplies the heat necessary for human survival
D．it screens off the falling meteors
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