单项选择题

Compared with Overhead bridges, zebra crossing is ______.

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