单项选择题

Which of the following is true according to the passage

A．Physiological changes will for sure betray a liar.
B．The bigger a lie is, the stronger the strain will be.
C．The degree of the strain depends on the purpose of lying.
D．A well-trained person can tell lies without being detected.
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单项选择题
In the first paragraph, the author implies that ________.
A．we are convinced that men are born evil
B．human beings are surrounded by piles of rubbish
C．there are a lot of obstacles on the way ahead of human beings
D．man's future is seen to be better advantage from his good nature
单项选择题
The information given by the lie detector, according to the author, is ________.
A．trivial
B．essential
C．surprising
D．unreliable
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