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
What type of writing is the written material
A．It is a story told by one of the flight crew of Apollo 11.
B．It is a news report filed by a correspondent on the spot.
C．It is a diary written by a member of the liftoff team.
D．It is a written statement presented to NASA.
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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