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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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
单项选择题
How many years passed by between her graduation from medical school and opening her hospital
A．8.
B．10.
C．19.
D．36.
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