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 the writer worries about in a big city is （）

A．the number of traffic lights
B．the shortage of buses
C．the lack of motorways
D．the traffic congestion
单项选择题
In many cities pedestrians are now much safer because（）

A．no traffic is allowed on some streets
B．traffic is computer-controlled
C．cars move very slowly
D．only one way streets are open to traffic
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