A、The workers on the underground platforms were replaced by machines. B、It became the first completely automatic railway in the

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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 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 from 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. If one train stays 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、The workers on the underground platforms were replaced by machines.
B、It became the first completely automatic railway in the world.
C、A completely automatic line was added to its network.
D、Its trains became computer-controlled.

答案B

解析 What happened to the London underground railway about three decades ago?
[听前预测] 由选项中的underground platform,replaced,first,added,computer-controlled可推断本题可能与地铁的改进有关。
[答案详解] 细节辨认题[考频:16]。本题关键句为“The world’s first completely automatic railway has been built under the busy streets of London... The new Victoria Line was opened in 1969.”1969年第一条全自动地铁在伦敦开通。故正确答案为B)。
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