21-25 為題組 AN只,
lso known as a “lie detector,” is a common part of criminal
A polygrapf machine,al
investigations. The instrumentlls used glmeasure _21_aperson's body reacts to questions-
The theory underlyifg it is that lying is stressful, and that this stress can be measured and
recorded on a polygraph machine.
“When a person takes a polygraph test, four to six wires, called sensors, are _22_to
differpnt parts of his body. The sensorsJpiek 過 nals from the person's blood pressure,
pulse, and perspiration. _23_the process of questioning, all the signals are recorded on a
single strip'of moving paper' Once the questions]are finished] the examiner analyzes the
results to determine(if2he person tested_24_truthful.
Well-trained examiners can usually detect lying with a high degree of _25_when
they use a polygraph. However, because different people behave differently when lying, a
polygraph test is by no means perfect-
絕不
*儿21.(A) wh
_色22.(A) adqapied 悶傘 (B)
六 23.(A) Before
“了巷
