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

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单项选择题

We can draw the conclusion that ______.

A．3G signals and current signals transfer data at the same speed
B．3G mobile phone service will not be allowed for its bad impact
C．more tests would be done to check the results of the study
D．second-generation mobile phones will take the place of 3G mobile phone

单项选择题

We wanted to get home before dark, but it didn't ______ as we planned.

A．turn out
B．make out
C．go on
D．come up