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

admin2009-09-12  25

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, to check and to collect them when people leave the trains. This is all different of 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 send 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、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.

答案A

解析 [听力原文]
If no signal is sent from the command spot, what will happen to the train?
由选项推测本题考查it发出的动作。本题关键句为“If the command spot send no signals,the train will stop”,如果控制台没有信号列车将停止,故正确答案为A)。
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