想问问唐塘老师这题思路是什么，我是选的d，因为我看只有d讲了左脑，而且我觉得是稍微有些相关的，不是说其他事，但是我也知道不能只看词做题，所以希望唐塘老师完整解答一下，谢谢

请郭老师解答 我选了B

文中的意思-language center 受损（由stroke引起），语言能力受损，则如果某人barin受损（由stroke引起）但语言能力没问题，则语言中心在右边；我的理解-stroke要损伤脑---脑中的语言中心---语言能力；这里assumption就是brain受伤代表了language center受伤；A无关；B说了languge center受损，语言能力受损，并不是assumption-或者说这个assumption题目中已经给出了；C无关；D我没看懂at least one of them。我可能最想要的assumption就是stroke损伤了one side of brain，就等于损害了languge center（如果that side of brain有language center）；

为什么答案是d

CR

B和C范围出去了，可以排除。其中B（people who have not suffered any damage ）和C（any other cause of damage to language centers ）不是原文范围，留下A D E.比不出来。 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? No part of a person's brain that is damaged by a stroke ever 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.

是演绎题都要有否定词还是假设呢？？怎么没听过这个概念啊

这道题我留下了B D B说没受过损伤的人就不会有impairment我觉得这个是前提啊。。。如果没受过损伤也有impairment的话推论就不成立了 D说stroke会带来损坏，也是前提 两个比较的时候出错了，不知道如果一句话是前提的话存在范围问题吗？