听力首页 听力教程 VOA慢速 英语歌曲 外语下载 英语小说 英语词典 在线背单词 听力论坛 韩语学习
听力专题 英语教材 VOA标准 英语动画 英语考试 资源技巧 英语翻译 单词连连看 听力家园 德语学习
听力搜索 英语导读 BBC英语 英语视频 英语电台 英语QQ群 外语歌曲   英语游戏 英语网刊 日语学习
当前位置: 英语听力论坛 » 【六级教室】 » 六级练习2015.09.09
返回列表 发帖

六级练习2015.09.09


       
       




The world’s first completely automatic railway has been built under the busy streets of London.(1) ___________________________________________.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 platform.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.(2) ________________________________.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.(3) __________________________.So there is no danger of accidents on the line.




本帖隐藏的内容需要回复才可以浏览

返回列表