单项选择题

People on foot can go across the road when ______.

A．the traffic lights are green
B．they look to the right
C．the road is clear
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单项选择题
The best title (标题) would be ______.
A．Buses in England
B．Traffic in England
C．Traffic Lights in England
单项选择题
Some people enjoy sitting on the second floor of a big bus because ______.
A．it is no danger
B．there are fewer people there
C．they can have a better view of the city
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