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
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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
单项选择题
Which of the following may be unnecessary in conducting Gallup Poll
A．Sampling the subjects according to different factors.
B．Regulating factors according to circumstances.
C．Interviewing as many people as possible.
D．Using laws of probability to forecast the result.
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