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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 brain 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?
  • ANo part of a person's brain that is damaged by a stroke ever recovers. 分析该选项
  • BImpairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain. 分析该选项
  • CStrokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain. 分析该选项
  • DIf 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. 分析该选项
  • EIt 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. 分析该选项
正确答案: D

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