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
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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.
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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