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
What do old people think of crossing the overhead bridges
A．They like the idea of building the overhead bridges.
B．They have no difficulty using the overhead bridges.
C．They think the overhead bridges are too expensive to build.
D．They find overhead bridges somewhat inconvenient to use.
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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