Although "lie detectors" are widely used by governments, police departments and businesses, the results are not always accurate.

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问题    Although "lie detectors" are widely used by governments, police departments and businesses, the results are not always accurate.  Lie detectors are commonly【C1】______as emotion detectors, for their aim is to【C2】______bodily changes that contradict what a  28  says. The lie detector records changes【C4】______heart rate, breathing, blood pressure, and the electrical【C5】______of the skin. In the first part of the【C6】______, you are electronically connected to the ma chine and【C7】______a few neutral questions("what is your name?" etc). Your physical reactions serve【C8】______the standard for evaluating what comes【C9】______. Then you are presented with a few【C10】______questions among the neutral ones("When did you rob the hank?" ). The idea is that if you are【C11】______, your body will reveal the truth, even if you try to【C12】______it. Your heart rate and breathing will change【C13】______as you respond to the question.
   That is the theory, but psychologists have found that lie detectors are simply not【C14】______. Since most physical changes are the same across【C15】______emotions, lie detectors cannot tell【C16】______you are feeling angry, nervous or excited.【C17】______people may be tense and nervous【C18】______the whole procedure. They may react physiologically to a certain word("bank")not because they robbed it, but because they recently used a bad check. In either【C19】______, the machine will record a "lie" .
   On the other hand, some practiced liars can lie【C20】______hesitation, so the reverse mistake is also common.
【C19】

选项 A、fact
B、case
C、condition
D、chance

答案B

解析 本题考查短语固定搭配。A 项fact 一般和in 搭配,中间没有冠词,in fact 意为“事实上”; B 项case 一般和in 搭配,中间有冠词,如in either case,意为“在(两种情况中)任意一种情况下”,其他搭配还有in such a case/ in the case of sth./in some cases/in most cases /in sb.’s case,意为“在……情况下”;C 项condition 一般和under 搭配,如under some condition;D 项chance 常和by 搭配,中间不加冠词,by chance 意为“偶尔”。
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