题目信息
Educational Theorist: Recent editorials have called for limits on the amount of homework assigned to children. They point out that free-time activities play an important role in childhood development and that large amounts of homework reduce children's free time, hindering their development. But the average homework time for a ten year old, for example, is little more than 30 minutes per night. Clearly, therefore, there is no need to impose the limits these editorials are calling for.
Which of the following is an assumption on which the educational theorist's argument relies?
A:The free-time activities that ten year olds engage in most are all approximately equally effective at fostering development
B:Regularly doing homework assignments improves children's academic performance.
C:Individual teachers are not the best judges of how much homework to assign the children they teach
D:In most schools, if not all, the homework assignments given are of a length that does not diverge widely from the average.
E:Free-time activities rarely teach children skills or information that they can use in their academic work.
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正确答案：
D:In most schools, if not all, the homework assignments given are of a length that does not diverge widely from the average.
题目结论为平均30分钟左右的作业（assumption）没必要再给作业时间加限制（conclusion）。所以答案应该跟作业时间，和要不要限制有关
A课余活动的质量问题，无关
B学术表现不在此题的讨论范围之列
C老师布置作业无关
D正确。大部分学校学生作业时间都在30分钟左右，所以不需要限制
E课余活动内容，无关
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