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

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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
单项选择题
What city once experimented with a completely-free bus service（）

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