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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 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 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 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、criminal
C、person
D、suspect
答案D
解析 本题考查对文章内容的整体把握。根据上文可知，政府、警界和商业部门都用测谎仪，所以答案不能选policeman“警察”和criminal“罪犯”等确定的具体选项，这些选项都不够全面；而C项person“人”这一概括性概念，涵盖所有意项，过于宽泛。通观全文可知，测谎仪是要检测出有嫌疑对象是否在说谎，因而此处只能用suspect“嫌疑犯”来搭配。故答案选D。
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