单项选择题

Mr. D. W. Robinson discussed noise both in sociological terms and in terms of energy. What did he mean by this distinction

A．They refer to the objective and subjective nature of the problem respectively.
B．Noise is dispensable in terms of energy but it is indispensable in sociological terms.
C．Noise is hard to control in terms of energy while it may be controllable in sociological terms.
D．All of the abov
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单项选择题
From the passage, we can learn that the Gallup Poll______.
A．is based merely on sociological calculations
B．can always predict accurate results
C．has been used in other countries other than the US
D．has become the best choice in predicting scientific results
单项选择题
Gallup became famous because______.
A．his system was much cheaper than the customary mass inquiries
B．he promised to refund the entire cost of the investigation if it failed
C．he succeeded in predicting better presidential election result
D．he was showered with money and commissions
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