单项选择题

Increase in the temperature of tropical soil _______.

A．might cause the overflow of flood
B．may lead to the loss of organic nitrogen in it
C．will produce a great deal of organic nitrogen
D．is harmless to the growth of rain forests

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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.

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.