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 very cheap bus service
A．London.
B．Rome.
C．Stockholm.
D．None of the above.
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