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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
结论：如果一个人的左脑受损伤，但是语言不受影响，那么他的语言中枢一定在右脑。
错选E：”如果一个人的任何一边大脑没有受伤，那么不可能判断人的哪边大脑有语言中枢（language center）“，无法得出结论。
E取反，无法否定结论：”如果一个人的任何一边大脑受伤，那么有可能判断语言中枢在左半脑还是右半脑。“
选项D：“如果一个左脑有多个语言中枢，那么左脑中风则一定会损伤这些语言中枢的其中一个”，可以得出结论：“如果一个人左脑中风了，但语言中枢却没受影响，那么语言中枢一定不在左脑，即在右脑。”
D取反：”如果一个左脑有多个语言中枢，那么左脑中风则不一定会损伤这些语言中枢的其中一个“，那么否定结论，即D为assumption。
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