单项选择题

According to the author, the main problem of our environment today is ______.

A．the increase of population
B．the limited energy resources
C．the more serious air pollution
D．the development of technology
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单项选择题
The author's main purpose in writing this passage is most probably to______.
A．complain about people's slow actions to protect the environment
B．advise people to take actions to protect the environment
C．show himself to be an active environment protector
D．point out the bad effects of technology in protecting environment
单项选择题
The passage is mainly about ______.
A．energy resources saving
B．environment protection
C．population control
D．air pollution
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