求助prep2-27

27.   (30565-!-item-!-188;#058&005567)

Among people who experience migraine headaches, some experience what doctors call "common" migraines, whereas others experience "classical" migraines.  Siblings and spouses of common migraine sufferers are themselves twice as likely as the general population to experience common migraines.  Siblings of classical migraine sufferers are four times more likely than the general population to experience classical migraines, whereas spouses of classical migraine sufferers are no more likely than the general population to experience such headaches.

The information above provides the most support for which of the following hypotheses?

(A) Susceptibility to classical migraines is more dependent on hereditary factors than is susceptibility to common migraines.

(B) Unmarried adults are more likely to suffer from classical migraines than they are to suffer from common migraines.

(C) People who do not experience migraine headaches are unlikely to have spouses who are migraine headache sufferers.

(D) Children of people who suffer from common migraines are not more likely than the general population to experience a common migraine.

(E) Between one-quarter and one-half of the general population suffer from either common or classical migraine headaches.

不明白为什么选A

Susceptibility to
            classical migraines is more dependent on hereditary factors than is susceptibility to
            common migraines.

classical migraines 明显Siblings高于一般说明是遗传因素更重要 4倍〉2倍

谢谢~~

可是为啥siblings高于一般就是说明遗传因素更重要呢？

我还是觉得有点不对劲，如果题目说某个人的sibling 比其配偶更容易 ...就很容易理解选A了

是不是我的思路上出了点问题??

谢谢~~

 "common" migraines：Siblings/general population=2   spouses/general population=2   

"classical" migraines：Siblings/general population=4   spouses/general population=1

四对关系比较