单项选择题

In the eyes of the author, conventional opinion on conflict is ________.

A．wrong
B．oversimplified
C．misleading
D．unclear
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单项选择题
The U. S. has to deal with the problems arising from vehicle use because ________.
A．most Americans are reluctant to switch to public transportation systems
B．the present level of oil prices is considered unacceptable
C．other countries will protest its increasing greenhouse emissions
D．it should take a lead in conserving natural resources
单项选择题
Which of the following is practical but only makes a marginal contribution to solving the problem of greenhouse emissions
A．The use of fuels other than gasoline.
B．Improved energy efficiency.
C．The introduction of less polluting driving systems.
D．Reducing car use by carpooling.
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