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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
PRE1：大多数人左脑控制语言。
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。
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