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 passage is mainly about ______.
A．energy resources saving
B．environment protection
C．population control
D．air pollution
单项选择题
The author believes that carpooling ______.
A．can give help to those without cars
B．can save people money and time
C．can save energy resources and reduce air pollution
D．can promote the friendship among drivers
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