【单选题】
Lie detectors are widely used in the United States because _____________. ___
A. they can help detect people’s emotional stress
B. they can help detect people's physiological changes
C. they can help find out whether a person is telling the truth or not
D. they can measure the subject’s electrical resistance
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答案
C
解析
暂无解析
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What troubles lie detector researchers most is that _______________. ___
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【单选题】
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