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

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.

单项选择题

According to the passage, compared to 3G mobile phones, the second-generation phones ______.

A．do not receive signals transmitted with an electromagnetic field
B．can receive signals from a larger area than 3G mobile phone
C．cause worse impact when they are used close to the head
D．have no negative impact on human health