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
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
Which of the following is the ultimate reason for the decline of tropical rain forests
A．Unfavorable climate.
B．Human abuse of forests.
C．Increase in the temperature.
D．Unusual rainfalls.
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