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
Which of the following is one example of our loss of morality
A．Lack of devotion.
B．Disregard for leaders.
C．Exploitation of resources.
D．Lack of cooperation.
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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