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
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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
单项选择题
The message the author transmits to us is that ________.
A．it is vital for us to be truthful to each other
B．lying will be checked by more advanced lie detectors
C．a lie detector can make a good record of nerve impulses
D．a liar benefits himself from lying, but only at the cost of others
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