单项选择题

What might be the meaning of the word "climatological" in Line 5, Paragraph 1

A．Of or relating to climates.
B．Of or relating to the changes of climates.
C．Of or relating to the study of climates.
D．Of or relating to climates in a certain area.

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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

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.