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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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
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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