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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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
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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