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

Which organization was the first to study the impact of mobile phones on health

A．The International GSM Association.
B．The International Agency on Research on Cancer.
C．The Dutch technological research institute.
D．The 3G research organization.