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A．It is no longer available.
B．It has been reprinted four times.
C．The store doesn’’t have it now, but will have it soon.
D．The information in the book is out of date.
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单项选择题
H
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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