请教陈向东<<GMAT逻辑推理>>里的2道题

Bichenfei928

这都是2道weaken类型的题目，因为刚开始接触这一类型，所以是一些比较弱弱的题目......
1. The ratio of dicorces to marriages has increased since 1940. Therefore, there must be a greater proportion of children living with only natural parent than there was in 1940.
Which of the following, if ture, most strongly weakens the inference drawn above?
A The number of marriages entered into by women twenty-five to thirty-five years old has decreased since 1940.
B When there is a divorce , children are often given the option of deciding which parent they want to live with.
C Since 1940 the average number of children in a family has remained approximately steady and has not been subject to wide fluctuations.
D Before 1940 relatively few children whose parents both died were adopted into single-parent families.
E The proportion of children who must be raised by one parent because the other has died has decreased since 1940 as a result of medical advances.

答案是E，但是我觉得除E之外的其他4个肯定不对，但是这个E我就是不理解

2 When the hypnotized subjects are told that they are deaf and are then asked whether they can hear the hypnotist, they reply,"No." Some theorists try to explain this result by arguing that the selves of hypnotized subjects are dissociated into separeted parts , and that the part that is deaf is dissociated from the part that replies.
Which of the following challenges indicates the most serious weakness in the attempted explanation described above?
A Why does the part that replies not answer , "Yes"?
B Why do the observed facts in need of any special explanation?
C Why do the subjects appear to accept the hypnotist's suggestion that they are deaf?
D Why do hypnotized subjects all respond the same way in the situation described?
E Why are the separete parts of the self  the same for all subjects?
这种题型改怎么解答啊？ 一点思路没有， 答案是A

双鱼游

第一道题，推理：自从1940年后，离婚比率增大了
                结论：以后单亲家庭的孩子所占的比例肯定比1940年的大
答案E说 由于医学的进步，由于父母的一方死去的单亲家庭的孩子比例变少了，直接否定结论，从另一个角度说单亲家庭的孩子比例没变大，因为单亲家庭的孩子不仅包括父母离异的，还包括父母因病去世的