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有些平时成绩优秀的同学,大考时成绩却低得令人难以置信,而有些平常成绩平平的同学,却总有超水平的发挥.同一名学生在两次难度相近的考试中,成绩波动很大,这是什么原因呢?公认较
Some students who usually have good grades usually have unbelievable grades when they take the exams but some who usually have a mediocre performance but always have the same level of performance. What is the reason?