51. It is estimated that there are
927 million passengers per day
253 million passengers per day
3 million passengers per day
1 million passengers per year
52. According to the passage, what is true about the London Underground?
The London Underground runs, as the name implies, all the time underground
There are more than 275 stations open now.
The Waterloo & City line is the longest in the system.
Baker Street station is decorated with profiles of Sherlock Holmes' head.
53. Which one does NOT refer to the "tube" lines?
Have the same loading gauge as British mainline trains.
Run about 20 metres below the surface.
Each track runs in a separate tunnel lined with cast-iron rings.
Emerge onto the surface outside the central area.