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【C3】______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 machine and【C7】______a few neutral question("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 bank?"). 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 questions.
    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 can- not 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 从上下文看,此句的意思是“无论在哪种情况下,测谎仪都会记录下该人在说谎”。空格处的意思应为“情况、情形”,选项中fact一般和in搭配,in fact为固定搭配,意为“事实上”;case和in搭配,中间可以加修饰词,in either case,意为“在任意一种情况下(两者之中)”;condition一般和under搭配,构成短语under some condition;chance常和by搭配,by chance意为“偶尔”,是固定说法。故B项符合文意。
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