og-137

zcx

137. A study of marital 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 both 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 seriously 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.

(D) People in unhappy marriages have been found to express hostility by adopting a different sleeping and waking cycle fro m that of their spouses.

a选项使用的他因也能导致危害婚姻， 为什么不对呢？我觉得很多题目都是用着这方法来weaken原因的，错在什么地方？

d的weaken方向很明显，原文使A->B,  WEAKEN 就B->A， 我想问这种方式是在什么情况下用的？谢谢

zcx

我愚昧，未能弄懂jj的意思