单项选择题
Boll ______.
A.has been enjoying the victory over the Japanese
B.is a professor at the State University of New York
C.was one of the scientists who made atomic bombs
D.has made himself certain he had done nothing wrong
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单项选择题
According to the passage, ______ appeared earlier than ______.
A.apples; oranges
B.oranges; apples
C.oranges; roses
D.algae; wheat
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单项选择题
Plants with roots appeared about ______ million years ago.
A.430
B.300
C.330
D.100
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