15. It is true that unionized women earn, on average, more than a third more than nonunionized women do. But the unionized women work in industries where wages happen to be high, their nonunionized counterparts in these industries earn about as much as they do. Therefore unionization does not raise women’s wages.
Which of the following, if true, most seriously weakens the argument above?
(A) Besides wage increases, unions bargain for benefits such as medical insurance and workplace safety.
(B) The most highly paid women are in executive positions, which are not unionized.
(C) Wages in many industries vary from one part of the country to another, regardless of whether workers are unionized or not.
(D) Nonunionized women in an industry often receive income increases as a result of increases won by unions representing women who work for other employers in the same industry.（D）
(E) The unionization of women who work for one employer in a given industry frequently prompts the unionization of women who work for other employers in the same industry.
这题相比之下选项应该为D没问题。可是个人觉得D也不是一个逻辑很严密的答案，因为它没有回答为什么参加union和不参加union的妇女工资一样高的情况只发生在industries where wages happen to be high, D的理由如果是一个普法原则，那么就应该所有的industries里面参加union和不参加union的妇女工资都一样，而不会只发生在高工资的产业。希望大家能讨论一下。
没人讨论，是不是除了我，大家都觉得这个问题不是问题？
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