单项选择题

Gallup's system proved to be ______.

A．much cheaper
B．a huge success
C．a great failure
D．much costly
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单项选择题
All of the following are the characteristics of the inquiries mentioned in the second paragraph except ______.
A．a large number of questionnaires were sent out
B．quantity rather than quality was emphasized
C．almost no effort was made to interview people from every walk of life
D．every publication in America got involved
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