单项选择题

This passage is probably ______.

A．a newspaper advertisement
B．a chapter of a novel
C．an excerpt from a textbook
D．a scientific report of new findings
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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.
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