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题库 / GMATLA-CR-16
For most people, the left half of the brain controls linguistic capabilities, but some people have their language centers in the right half. When a language center of the brains is damaged, for example, by a stroke, linguistic capabilities are impaired in some way. Therefore, people who have suffered a serious stroke on the left side of the brain without suffering any such impairment must have their language centers in the right half.
Which of the following is an assumption on which the reasoning in the argument above depends?
No part of a person's brain that is damaged by a stroke never recovers
Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.
Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain.
If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them.
It is impossible to determine which side of the brain contains a person's language centers if the person has not suffered damage to either side of the brain
PRE2：大脑的语言中心受S损坏时，语言能力也会损坏。
CON：左脑受S伤，语言能力没变化时，大脑的语言中心在右边。
D 两个假设可以看出，一个讲的是左脑，一个讲的是脑中的语言中心，要有附加前提建立左脑与脑中的语言中心的关系。即如果语言中心在，那么伤害大脑的中风也会伤害到他们。建立了中风---左脑---左脑语言中心---语言能力的必要关系。这样才能得出题目结论。
用取非则weaken的办法来做会发现：
D选项非后就是，If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages none of them.
Stroke不影响语言中心，那么就压根不能推出结论
E取非：
It is possible to determine which side of the brain contains a person's languagecenters if the person has not suffered damage to either side of the brain.可能决定。这种模棱两可的答案怎么可能成为assumption。
因：左边脑受到严重的中风，但是语言能力没受影响
果：语言能力受右脑控制
gap：中风是不是一定会影响到大脑中控制语言能力的中心？？如果不影响的话也就无法知道 语言能力在哪边了
（做题的时候太慌了选项压根读不进去）
B.是没有被stroke的人，属于无关对象
D.任何stroke都会对center带来损害，如果不是，那么不是stroke后没反应就是center不在这边
排除可能性：即这个人语言中心可能在左脑，只不过中风没有损害其语言中心。D取非
原文写的是大脑损坏但是没有失语症的人
不是一个群体
D在说suffered a serious stroke就会损伤at least one side of the brain如果不损伤，那就没法推论啦
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