您在's/of各条中列举了使用属格形式的各类名词。但是,我不知道把下面的属格名词归到哪类名词中去:
the water's surface(水表面), for charity's sake(为了仁慈)
's/of 各条从属格名词本身的角度谈到了使用属格的条件。我们还可以从另一个角度来谈论这个问题。有些作中心词的名词本身要求用属格名词来作它的定语，例如 sake, end, reach, surface, edge 等等。
art for art's sake(为艺术而艺术)
at one's wits' end(智穷计尽)
at the river's edge(在河的边缘)
at arm's length(以伸开手臂的距离)
within a stone's throw(近在咫尺)
[注意]for N's sake 亦可说成 for the sake of N。例如：
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We must struggle for the sake of peace. 我们必须为和平而斗争。
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He bought a house in the country for the sake of his wife's health. (Chambers) 为了妻子的健康,他在农村买了一幢房子。
请做下面的英语试题：
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The perfectionist is for the exacting, his approach has with the requirements of a situation. (TOEFL)
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People who cross the Atlantic frequently do not make the voyage for the ____ of sight-seeing. A. reason B. motive C. cause D. sake(Nelson, 400A)