53. What happened when the negative reciprocity variable was taken into account?
A) Both men and women were found to engage in negative behaviors.
B) Neither men nor women viewed booking late as a bad behavior.
C) The gender difference in airfare expenses no longer existed.
D) The gender gap tended to narrow to a significant degree.
答案&解析
53.C）
第四段最后一句指出，这只意味着当我们插入消极互惠的变量时，性别差距就消失了。由此可知，当考虑消极互惠变量时，机票价格的性别差异就不复存在了，故选项C正确。选项中的no longer existed与原文中的disappears是同义替换。其余三个选项原文都没有提及，均可以排除。
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