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

<上一题目录下一题>

热门试题

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.

单项选择题

Which of the following factors concerning the electorate may NOT be considered in Gallup Poll

A．Social status.
B．Races.
C．Nationalities.
D．Intelligenc