单项选择题

The destruction of natural vegetation has resulted from ______.

A．agricultural demands
B．stockbreeding demands
C．construction demands
D．all of above
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单项选择题
The author believes that humans first appeared in Africa because ______.
A．Africa is the source of human civilization
B．there are a lot ancient human fossils found in Africa
C．African was once the fittest place for humans to live
D．of reasons not given here
单项选择题
The ingredient of atmosphere does NOT include ______.
A．carbon dioxide
B．dust particles
C．water vapor
D．sunlight
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