单项选择题

Questions 22 to 25 are based on the passage you have just heard.

A. It will stop automatically.
B. It will move on at the same speed.
C. It will gradually slow down.
D. It will keep a safe distance from the other trains.
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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.
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.
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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