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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  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.
【C3】
选项 A、policeman
B、suspect
C、person
D、criminal
答案B
解析 此题考查对文章内容整体的理解。根据上文，政府、警察局和商业部门都用测慌仪，所以答案不能选D 项criminal“罪犯”和A项policeman “警察”等确定的具体意项；而C 项 person “人”这一概括性概念，涵盖所有意项，过于泛泛。通观全文可知，测谎仪是要检测出有嫌疑的对象是否在说谎，因而此处只能用B 项suspect "嫌疑犯”来搭配。
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