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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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
单项选择题
The phrase Exact money only ( Para. 2 ) means ______.
A．change is offered
B．no change is given
C．no coins are accepted
D．only coins are accepted
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