单选题The second paragraph is focused on _____.Athe principles of past lie-detection machinesBwhy past lie-detection machines did not workCwhy it is necessary to develop new lie-detection machinesDthe difference between past and present lie-detection machines
单选题
The second paragraph is focused on _____.
A
the principles of past lie-detection machines
B
why past lie-detection machines did not work
C
why it is necessary to develop new lie-detection machines
D
the difference between past and present lie-detection machines
参考解析
解析：
第二段的内容是说旧式测谎器的主要问题在于它依靠的是说谎的间接表象，如呼吸频率、血压、脉搏的变化等等，但是一个好演员就能克服这些问题。另一方面，一个说真话的人在受到盘问时也会表现出这些变化。所以说它的准确性和可靠性没有保障。
第二段的内容是说旧式测谎器的主要问题在于它依靠的是说谎的间接表象，如呼吸频率、血压、脉搏的变化等等，但是一个好演员就能克服这些问题。另一方面，一个说真话的人在受到盘问时也会表现出这些变化。所以说它的准确性和可靠性没有保障。
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