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A．applies
B．prepares
C．votes
D．compensates
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单项选择题The main idea of this passage is ______.

A．it is nature itself that should take the blame for the decline of North Africa
B．climatic changes coupled with forest abuse result in the decrease of forests in North Africa
C．without sufficient forests, the rains will take away all the organic nitrogen
D．since Roman times the rain forests in North Africa has been decreasing gradually

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.