We selected two three-grade natural classes from Dongjing Junior Middle School in changsha, divided into the experimental class and the control class.
在长沙市洞井中学选取初三年级两个自然班，分别为实验班与对照班。
We selected two three-grade natural classes from Dongjing Junior Middle School in changsha, divided into the experimental class and the control class.
在长沙市洞井中学选取初三年级两个自然班，分别为实验班与对照班。
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