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把一个班的学生分为三组,每天学习后就进行测验,测验后分别给予不同的反馈方式:第一组每天告知学习结果;第二组每周告知一次学习结
The students in a class are divided into three groups. After learning each day, they are tested. After the tests, different feedbacks are given respectively: the first group learns the learning results every day; the second group learns the learning results once a week