单项选择题

There are many reasons underlying today's environmental problems EXCEPT ______.

A．accelerating decline in the quality of the environment
B．rapidly expanding human population
C．advancing technology
D．growing demands in the environment

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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

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