单项选择题

A. To drive the train after it is started automatically.
B. To start the train and to drive it when necessary.
C. To take care of the passengers on the train.
D. To send commanding signals to the command spot.
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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.
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.
单项选择题
A. They are made of metal and glass. B. They cost about $50.C. They are usually found on the roof. D. They look like sandwiches.
A. They are made of metal and glass.
B. They cost about $50.
C. They are usually found on the roof.
D. They look like sandwiches.
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