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
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
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
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