单项选择题

Which of the following is the best solution to the problems mentioned in the passage

A．The designing of highly efficient car engines.
B．A reduction of vehicle use in cities.
C．The development of electric cars.
D．The use of less polluting fuels.
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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.
单项选择题
The U.S. has to deal with the problems arising from vehicle use he cause______.
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
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