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 Although the “lie detectors” are being used by governments, police departments, and businesses that all want guaranteed ways of detecting the truth, the results are not always accurate. Lie detectors are properly called emotion detectors, for their aim is to measure bodily changes that contradict what a person says. The polygraph machine records changes in heart rate, breathing, blood pressure, and the electrical activity of the skin (galvanic skin response, or GSR). In the first part of the polygraph test, you are electronically connected to the machine and asked a few neutral questions (“What is your name?”, “Where do you live?”). Your physical reactions serve as the standard (baseline) for evaluating what comes next. Then you are asked a few critical questions among the neutral ones (“When did you rob the bank?”). The assumption is that if you are guilty, your body will reveal the truth, even if you try to deny it. Your heart rate, respiration, and GSR will change abruptly as you respond to the incriminating questions.

 That is the theory; but psychologists have found that lie detectors are simply not reliable. Since most physical changes are the same across all emotions, machines cannot tell whether you are feeling guilty, angry, nervous, thrilled, or revved up form an exciting day. Innocent people may be tense and nervous about the whole procedure. They may react physiologically to a certain word (“bank”) not because they robbed it, but because they recently bounced a check. In either case the machine will record a “lie”. The reverse mistake is also common. Some practiced liars can lie without flinching, and others learn to beat the machine by tensing muscles or thinking about an exciting experience during neutral questions.
Question:What is the main idea of this passage?

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I have never listened to jazz music before

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The 26^th Annual Meeting of the Asia-Pacific Parliamentary Forum (APPF) ______ in Hanoi, our beautiful and peaceful capital city, from January 18^th to 21^st, 2018

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Alike light waves , microwaves may be reflected and concentrated elements.

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Many hundred years ago , there were many villages and little towns in England.

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Could you ______ me a lift into town?

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Noisy as the hotel was, they stayed there.

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They didn’t have the right visas. They couldn’t legally re-enter Thailand.

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Bob was absent; he _____ sick again.

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Britain’s Prime Minister Theresa May was the first world leader ______ Trump at the White House after his inauguration last year.

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If we use robots instead of humans, many people may be out of work

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Vietnam reached the semi-finals of the AFC U23 Championship 2018 with a penalty shootout win _________ Iraq on Saturday, January 20^th , 2018.

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I think we’ve come in for a lot of _____ about the impatience of some shop assistants.

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No vehicle weighing over 3.5 tons is allowed on this bridge, according to traffic signs placed at both ends of the structure

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He opened the letter without ______ to read the address on the envelope.

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The Ministry of Education and training of Vietnam has declared a decree on the new educational program paving the way for foreign educational co-operation and investment.