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Hastings' contracture is a disorder of the connective tissue in one or both hands, most commonly causing loss of mobility. A survey of thousands of medical-insurance claims found that over 30 percent of people who had one hand operated on for Hastings' contracture underwent surgery a second time for this disorder within three years. Clearly, therefore, a single surgical treatment of Hastings' contracture is often ineffective at providing long-term correction of the disorder.
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当前版本由 180701u 更新于2020-06-08 00:17:00 感谢由 180701u 对此题目的解答所做出的贡献。
文章中讲：
背景：Hastings这个疾病可能影响一只或两只手的运动能力。
Survey: 超过30%的术后患者（单手）会在两年内进行第二次手术
文章结论：单次手术没什么用
问题：哪个选项能反驳文章的结论（弱化文章的结论）
我们需要证明的是单次手术有用的，因此要证明从survey到文章结论的逻辑存在漏洞。简单来说需要证明在两年内进行第二次手术不能证明单次手术没用，联系背景，结合选项。
A正确，在两年内进行的第二次手术可能是针对另一只手的，因此不能证明之前的手术（针对不同的手的）没用。
BCDE带入不进需要证明的逻辑。
题目讨论
(如果对题目有任何的疑惑，欢迎在这里提出来，大家会帮你解答的哦~)
579171gr
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second option ： 货比三家。。。
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乌拉拉没有脑袋
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假设如果那30%做了第二次手术的人第一次的手术都是做了左手，那表明需要第二次手术主要是因为第一次做了左手，而不是因为第一次以手术无效
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204527j
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