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
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
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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