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 t

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问题  
The world’s first completely automatic railway has been built under the busy streets of London. The railway is called the Victoria Line, and it is part of the complete London underground railway.
    The new Victoria Line was opened in 1969. This new line was very different from the others. The stations on the other lines need a lot of workers to sell tickets, and to check and to collect them when people leave the trains. This is all different on the Victoria Line. Here a machine checks and collects the tickets, and there are no workers on the platforms.
    On the train, there is only one worker. If necessary, this man can drive the train. But usually he just starts it; it runs and stops by itself. The trains are controlled by electrical signals which are sent by the so - called "command spots".
    The command spots are the same distance apart. Each sends a certain signal. The train always moves at the speed that the command spots allow. If the command spot sends no signals, the train will stop.
    Most of the control work is done by computers. The computers also fix the train’s speeds, and send the signals to the command spots.
    Other machines make sure that the trains are always a safe distance apart. One train may stay too long at a station; the other trains will then automatically move slower. So there is no danger of accidents on the line.

选项 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.

答案B

解析 选项均以to+do的形式开头,表明本题考查做某事的目的或行为活动。问题询问的是工人在Victoria铁路线上的任务是什么。文中提到在维多利亚线运营的火车上,工人只需启动火车,或在必要时进行驾驶,B项正确。
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