如何激发农村中学差生学好英语，是中学英语教学的一个关键。
How to stimulate the countryside middle school difference to live learns English, is a middle school English teaching key.
中学优差生在目标设置的效果上存在一定的差异。
There exist differences in the effects of goal setting in middle school le students.
目的探讨城市中学生睡眠状况与学习成绩的关系，及优差生之间睡眠状况有无差异。
ObjectiveTo explore the relationships between performance record and sleep status of urban middle school students, and to search for difference of sleep status between the good students and the bad.
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