If you've paid to be in the quiz, there is usually a surprising prize.
如果你花钱参加测试，通常会有一份惊喜奖品。
One of the experiments he did to test this idea was to subject a bunch of undergraduates to a quiz. His volunteers were told that the best performer among them would receive a 50 dollars prize.
他做的试验之一是找一帮本科生来做一个小考试，这些志愿者被告知，成绩最高的人会获得50美元奖励。
Sometimes the prize was deserved and was based on the score they were told they had earned on a quiz.
这些奖励有的时候是根据他们所获知的测验成绩来发放的，是他们应得的；
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