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
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.
单项选择题
By reading The Open and Closed Mind, we may ______.
A．find a' way of solving the Denny Doodlebug problem
B．realize how little we know about the complexity of human behavior
C．bring to light codes of some societies which we didn' t know before
D．be aware of the difficulties of communications between different cultures
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