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 traffic lights are red
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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
When you go by bus in England, you must be careful because ______.
A． you may go the wrong way
B． there are too many buses there
C． there are big buses with two floors
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