2. 外语
  3. If you have visited London, I’m sure that you have travelled on the London Underground.The earliest underground railway line in

If you have visited London, I’m sure that you have travelled on the London Underground.The earliest underground railway line in

admin2021-04-02  60
问题
        If you have visited London, I’m sure that you have travelled on the London Underground.The earliest underground railway line in London was built in the middle of the 19th century.Steam engines pulled the trains, and smoke filled the stations and tunnels.Despite this, Londoners loved their new underground trains.They were a quick and convenient way to get to work.People could work in central London but live away from their work, often in better houses than before.New underground lines were built in the late 19th and the 20th century.They helped London to grow bigger and bigger.
        Both Londoners and visitors needed to know which underground lines went to which places.They needed maps.Until the 1930s, maps of the underground were simply street maps with the underground lines added.In the centre of London, where there are lots of underground lines and stations, the maps were crowded and difficult to read.But if you made the map so that you could see easily what the underground system in central London was like, the map had to be very big to cover all the underground lines in the suburbs.
        The problem was solved by a man called Harry Beck.He drew a map which looks like an electric circuit diagram.He made central London big, so that you could see all the lines and stations, and the suburbs small so that the map was in a reasonable size.He drew the underground lines so that they were either vertical, or horizontal, or at 45 degrees.He gave the different lines different colours.He said that people needed the map so that they could see how to get from one station—say, Victoria to another station—say, Marylebone.People didn’ t need to know the exact route of the railway line, or the exact distance between stations.So there were no streets on his map, and the stations are all about the same distance apart.
        It was in the middle of the 19th century that Londoners built the first underground railway line.It helped Londoners go to work quickly and【A1】___________ and made the London become【A2】___________ in the next decades.However, the underground railway lines were simply【A3】___________to the street maps until the 1930s and they were hard to read.The problem was solved by Harry Beck who drew a map of underground railway lines like【A4】___________diagram, which can indicate all the lines in different 【A5】___________and stations with the same distance apart.
【A4】
选项
答案an electric circuit
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