A study of martial relationships in which one partner's sleeping and waking cycles differ from those of the other partner reveals that such couples share fewer activities with each other and have more violent arguments than do couples in a relationship in which choth partners follow the same sleeping and waking patterns. Thus, mismatched sleeping and waking cycles can seriously jeopardize a marriage.

Which of the following , if true, most seroiusly weakens the argument above?

A. Married couples in which both spouses follow the same sleeping and waking patterns also occasionally have arguments than can jeopardize the couple's marriage.

B. The sleeping and waking cycles of individuals tend to vary from season to season.

C. The individuals who have sleeping and waking cycles that differ significantly from those of their spouses tend to argue little with colleagues at work.

D. People in unhappy marriages have been found express hostility by adopting a different sleeping and waking cycle from that of their spouses.

E. According to a recent study, most people's sleeping and waking cycles can be controlled and modified easily.

正确答案是D

我不太明白，题目中说不同习惯会破坏婚姻。D选项的意思是在不开心的家庭里，接受配偶的不同习惯会产生敌意。那不是支持原文了吗？

准确地说D应该这么理解,不幸福的婚姻中的男女通过接受不同的习惯来表达第一.也就是说,D在说

是不幸福的婚姻导致了不同的习惯,而不是文中的不同的习惯危害婚姻.颠倒因果.