单项选择题

A．It will increase the amount of unpleasant odors from vehicles.
B．It will eventually destroy the ozone layer.
C．It will reduce the amount of pollutants in the air.
D．It will reduce the cost of running large vehicles.
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单项选择题
A．In San Francisco.B．In Washington.C．In Chicago.D．In New York.
A．In San Francisco.
B．In Washington.
C．In Chicago.
D．In New York.
单项选择题
A．People considered them essential.B．They were common in the United States, but not in Europe.C．Only a few people had them.D．They were actually not very accurate.
A．People considered them essential.
B．They were common in the United States, but not in Europe.
C．Only a few people had them.
D．They were actually not very accurate.
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