单项选择题

What city once experimented with a very cheap bus service（）

A．London.
B．Rome.
C．Stockholm.
D．None of the abov

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单项选择题

What city once experimented with a completely-free bus service（）

A．London.
B．Rome.
C．Paris.
D．Stockholm.

单项选择题

In London, how does they solve the problem of the traffic congestion（）

A．They take a completely-free bus service.
B．They experimented a very cheap bus service.
C．Part of the street is for buses only.
D．They closed the streets to cars.