单选题
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
【正确答案】
C
【答案解析】
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