单项选择题

Our cities were damaged by ______.

A．pollution of local air
B．the breakup of the family
C．pollution of the earth's atmosphere
D．the excessive growth of motors
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单项选择题
By a comparison between past problems and present ones the author draws attention to the ______.
A．importance of the energy crisis
B．hopelessness of the situation
C．differences between the past and the present
D．inadequacy of governments
单项选择题
What suggestion does the author make in order to grasp this opportunity
A．Search for new energy sources.
B．Forbid motor transportation.
C．Accept a new life style.
D．Adopt a new form of invention.
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