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

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单项选择题

Compared with Overhead bridges, zebra crossing is ______.

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

单项选择题

The passage mainly talks about ______.

A．the impact of mobile phone signals on health
B．the negative impact of current signals on health
C．the long-term effects of mobile phones on health
D．the possible causes of the impact of mobile phones