单项选择题

Overhead bridges are built ______.

A．for heavy traffic
B．for the safety of people
C．for the safety and convenience of drivers
D．to help traffic
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单项选择题
People are encouraged to use overhead bridges ______.
A．to prevent accidents and loss of life
B．because they could see moving cars slowly
C．in order to save, money for the government
D．in order that traffic may fl6w smoothly
单项选择题
The passage is mainly about ______.
A．restaurant development
B．smoking history in restaurants
C．people's reactions to anti-smoking laws
D．non-smoking laws
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