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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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
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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