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.
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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
单项选择题
The double-blind laboratory tests means ______.
A．nobody taking part in the test knows if the 3G base station is transmitting signals
B．only the subjects in the test know if the 3G base station is transmitting signals
C．no researchers know if the 3G base station is transmitting signals
D．everyone in the test knows if the 3G base station is transmitting signals
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