2011年6月六级阅读理解真题点评
5. Harvard, Yale, and Princeton show almost no gap between black and white graduation rates mainly because ______.
A. their students work harderB.they recruit the best students
C. their classes are generally smaller D. they give students more attention
解析：根据题干中的学校名Harvard、Yale和Princeton，考生可将答案信息定位至原文第五段第四句
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