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
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 statements is TRUE according to the passage
A．The decline of public transportation accounts for increased car use in western Europe.
B．Cars are popular in western Europe even though fuel prices are fairly high.
C．The reduction of vehicle use is the only sustainable option in densely populated western Europe.
D．Western European oil conpanies cannot sustain the cost of developing new type fuels.
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