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托福口语黄金80题 | 西安托福学习TPO14（四）
2019-08-29 23:08
来源：新东方网整理
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范文：
The professor talks about experimenter effect which occurs when a researcher’s expectation affect the outcome of an experiment. In the study, researcher was asked to train two groups of monkeys. He was told that one group of monkey was smarter than the other, although they are equally intelligent. It turned out monkeys from the first group took two hours less to train on average. The reason was that the researcher expected the smarter group to be easier to train so he smiled to those monkeys and encouraged them a lot during the training. But he didn’t work as hard with the monkeys from the other group.
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