单项选择题

Compared with Overhead bridges, zebra crossing is ______.
A) much safer C) more efficient
B) more convenient D) more popular

A．Compared with Overhead bridges, zebra crossing is ______.
B．much safer
C．more convenient
D．more efficient
E．more popular
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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
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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