单项选择题


A．effect
B．use
C．usage
D．affect
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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
单项选择题
According to the text, the fundamental cause of the ice ages is ______.
A．periodic changes in the earth's orbit around the sun
B．fossil remains of one-celled animals
C．alternating cold and warm seasons
D．changes in distance of the earth from the sun
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