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

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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