Many years agogland.The school had two classes for children of the same age.At the end of the school year an examination was held，in order to select the children for the classes of next year.However，the results of the exam were never made known.In secret，based on their performance in the exam，the higher－performing and lower－performing children were divided equally between the two classes.Only the headmaster and the psychologists knew the truth.Teachers for the next year were carefully selected for equal ability and experience.Even the classrooms were chosen with similar facilities (设备)．Everything was made as equal as possible：one was called “Class Athe other，“Class B”．

　　In everyone's minds the children in Class A were the clever ones，and the kids in Class B were not so clever.Some of the parents of the Class A children were pleasantly surprised that their children had done so well and rewarded them with presents and praise，while the parents of some of the Class B kids complained that their children did not work hard enough and took away some of their rewards.Even the teachers taught the Class B kids in a different manner，not expecting so much from them.For a whole year the illusion existed.Then there was another end－of－year exam.

　　e results were not surprising.The children of Class A performed so much better than those of Class B．In fact

　　【解题导语】　本文是说明文。文章介绍了一个令人深思的教育实验。

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