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六级练习2016.01.25


       
       




(1)_________________________________________________________.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.(2)__________________________________.On the train, there is only one worker.If necessary, this man can drive the train.But usually he just starts it; and 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.(3)______________________________________________.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.



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The world first completely automatic railway has been built under the busy streets of London.
Here on the shametect and collect ticket and there are no workers on the platforms.
The computer also fit the train speed and send the signal to the command spots.

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