单项选择题

The word" those" ( Line 4, Para. 1 ) refers to ______.

A．the jobs
B．the letters
C．the times
D．the employers
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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
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
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