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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热门试题

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Compared with Overhead bridges, zebra crossing is ______.

A．much safer
B．more efficient
C．more convenient
D．more popular