单项选择题

People are encouraged to use overhead bridges mainly because ______.

A．zebra crossing can be ignored
B．it is necessary to reduce traffic jam
C．they prevent accidents and loss of life
D．traffic is very heavy in large cities

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单项选择题

The advantage of overhead bridges is that ______.

A．they don't hold up traffic and they are safer
B．people can have a better view of the city
C．they are more convenient to use
D．they can save a lot of time and space

单项选择题

What do old people think of crossing the overhead bridges

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