单项选择题

The passage is mainly about ______.

A．the composition of environment
B．the impact of environment on human
C．the impact of human on environment
D．the causes of environmental problems
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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
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
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