单项选择题

Increase in the temperature of tropical soil________.

A．might cause.the overflow of flood
B．might 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．Unfavourable climate.
B．Human abuse of forests.
C．Increase in the temperature.
D．Unusual rainfalls.

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