一道CRstimulus求头脑风暴

kangtong1990 · 发表于 2012-9-13 22:55:27

Students who earn A and B grades are more likely to participate in sports than are students who earn C grades. Therefore,participation in helps students to achieve higher grades.
manhattan上面的一个练习，没有答案orz，哪位能想出一个assumption出来哇？

kangtong1990 · 发表于 2012-9-13 23:07:01

come on~动用聪慧的大脑啊！CDer们！

一道CRstimulus求头脑风暴

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