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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 is true about noise control
A．Domestic noises may be controlled by good manners.
B．Industrial noises may be controlled by advancement in technology.
C．Transportation noises may be controlled by the concerted efforts of a community.
D．All of the above.
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