A、Workers on the platforms and trains were replaced by machines. B、A completely automatic line was added to its network. C、It be

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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.
Questions 19 to 21 are based on the passage you have just heard.
19. What happened to the complete London underground railway in 1969?
20. Who does all the checking and collecting of tickets on the Victoria Line?
21. What is the task of the only worker on the Victoria Line train?

选项 A、Workers on the platforms and trains were replaced by machines.
B、A completely automatic line was added to its network.
C、It became the first completely automatic railway in the world.
D、Its trains became manual-controlled.

答案B

解析 选项中的automatic和manual一controlled表明,本题与一种采用不同运行方式的列车有关。由短文中提到的The world’s first completely automatic railway…the Victoria Line…was opened in 1969可知,1969年伦敦地铁出现了世界上第一条自动化线路,故答案为B)。
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