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.
178. In countries in which new life-sustaining drugs cannot be
patented, such drugs are sold at widely affordable prices; those
same drugs, where patented, command premium prices because the
patents shield patent-holding manufacturers from competitors. These
facts show that future access to new life-sustaining drugs can be
improved if the practice of granting patents on newly developed
life-sustaining drugs were to be abolished everywhere.
Which of the following, if true, most seriously weakens the
argument?
(D) Pharmaceutical companies can afford the research that goes into
the development of new drugs only if patents allow them to earn
high profits. D
请教：上题中的选项我理解都是他因，为什么在137中不对而在178中就成了
正确选项呢？请NN出手解释一下！谢谢！ | 
