单项选择题


A．effect
B．use
C．usage
D．affect
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单项选择题
A．But ifB．ButC．IfD．And if
A．But if
B．But
C．If
D．And if
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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