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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单项选择题
Seriously-deformed zones appear _______.
A．whenever the crusts move over mantle
B．when the plates move towards each other
C．in the narrow boundaries where two plates meet
D．to be the major topographical feature of the Earth
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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