单项选择题

This passage mainly tells reader how ______.

A．the London Underground works
B．the London Underground develops
C．a passenger buys subway ticket
D．a passenger travels on a subway train
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单项选择题
A map of the whole underground system can be found in ______.
A．every train
B．every station
C．some train cars
D．some ticket offices
单项选择题
On some trains, if a passenger wants to get off, he has to ______.
A．inform the driver
B．show his ticket
C．press a button
D．read a map
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