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D) Kids from all American families, either rich or poor.
正确答案为 B 你没有作答。 解析：
文章第三段中提到因此，贫困的孩子也经常更容易产生学习损耗（Consequently, poorer children are particularly prone to learning loss），由此不难得出答案，所以选B。 65.Which of the following can we learn from the passage?
A) The short school hours bring more chances to American richer kids to compete on the globe.
B) The short school hours have caused the lagging performance of all American pupils. C) The economic crisis in the US has exerted less effect on its economy than on its educational performance.
D) Some American universities have to help students to make up for their summer learning loss.
正确答案为 B 你没有作答。 解析：
文章最后一段中提到最近一份报告称，美国学生落后的学业，尤其是来自贫困家庭和少数民族家庭的孩子，比当前的衰退对经济发展的破坏更大（A recent report argues that the lagging performance of American pupils, particularly its poor and ethnic minority children, has caused more destruction on the economy than the current recession），由此可以的得出，文章最后一段主要说明美国孩子们上课时间少所造成的不良后果，即导致了他们的学业落后，选项B符合文章原意，所以选B。
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