单项选择题

A．It will reduce the amount of pollutants in the air.
B．It will increase the amount of unpleasant odors from vehicles.
C．It will eventually destroy the ozone layer.
D．It will reduce the cost of running large vehicles.
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单项选择题
A．I hour.B．3 hours.C．2 hours.D．Four hours.
A．I hour.
B．3 hours.
C．2 hours.
D．Four hours.
单项选择题
A．They are more convenient.B．Their storage space is more accessible.C．They are more energy-efficient.D．They take up less floor area.
A．They are more convenient.
B．Their storage space is more accessible.
C．They are more energy-efficient.
D．They take up less floor area.
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