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 green house 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

From the passage we know that the increased use of cars will ______.

A．consume half of the oil produced in the world
B．have serious consequences for the well-being of all nations
C．widen the gap between the developed and developing countries
D．impose an intolerable economic burden on residents of large cities