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

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单项选择题

The advantage of overhead bridges is ______.

A．they don't hold up traffic and they are safer
B．they are higher
C．they are more convenient to use
D．people can see traffic better

单项选择题

According to the passage ,which of the following statements is true

A．Overhead bridges are inconvenient only to elderly people.
B．Using overhead bridges can save people some time.
C．It's a waste of money for the government to build overhead bridges.
D．Using overhead bridges' is a way of avoiding danger and deaths.