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文章最后一句thus there is no need to look further for an explanation of the difference in the stufies' results.意思是说不同的方法是这两个study结果不同的原因。
key's D.选项D说文章错在没有认识到，不同的方法可以得出相同的结果。但是本来这两个study的结果就是不同的啊，为什么D对？
D questions whether there could be similar results from two different methods.
For this question we are trying to discount the argument by pick on its flaw. Here the phenomenon is the same - length of workweek. Why should two different approach yield different result? There is a high probability that the results should be identical and the argument neglected such probability.
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