单项选择题


A．built
B．burned
C．piled
D．grown
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单项选择题
A．effectB．useC．usageD．affect
A．effect
B．use
C．usage
D．affect
单项选择题
The first paragraph of the text deals mainly with the earth atmosphere's ______.
A．sheltering effect
B．reviving effect
C．invigorating effect
D．cleansing effect
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