单项选择题

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．He hasn’t cleaned his room since Linda visited him.B．Linda is the only person who ever comes to see him.C．He’s been too busy to clean his room.D．Cleaning is the last thing he wants to do.
A．He hasn’t cleaned his room since Linda visited him.
B．Linda is the only person who ever comes to see him.
C．He’s been too busy to clean his room.
D．Cleaning is the last thing he wants to do.
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.
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