单项选择题


A．forms
B．existence
C．contents
D．purpose
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单项选择题
A．sourceB．originC．courseD．finance
A．source
B．origin
C．course
D．finance
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．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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