单项选择题

According to the second paragraph, the formation of the Atlantic Ocean is the example of ______.

A．spreading contacts
B．the influence of volcanic eruptions
C．converging contacts
D．transform contacts
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单项选择题
From this passage we can infer that the author's attitude toward the theory of some geologists (Line 3, Para. 1) is ______.
A．approval
B．disapproval
C．indifference
D．displeasure
单项选择题
What do people usually think contributed to the decline of North Africa
A．Human factors.
B．Economic factors.
C．Climatic factors.
D．Population factors.
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