单选题
A lie detector find out that the subject is telling a lie______
A、
by detecting and analyzing the subjects physical changes
B、
by increasing the subject's pulse rate, sweating and breathing rate
C、
by analyzing the answers of the subject to certain questions
D、
All of the above
【正确答案】
A
【答案解析】
第四段指出,这种仪器可以检测脉搏速率、发汗程度和呼吸速率,它被认为通过在对测试对象回答问题时这些因素的测量可以发现是否撒谎。
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