求问T-9-Q40！！！

薇若妮卡1209 · 发表于 2011-3-30 00:28:38

亲们，这道题真的怎么都想不明白为什么A选项不正确，有人能解答下不~
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?

A.No part of a person’s brain that is damaged by a stroke never recovers

B.Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.

C.Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain.

D.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.

E.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.

这一题我悟出来了。第二句中的for example不能将前后等同，即第三句中的the stroke不能等同于damage所以，需要有一个前提来说明。Ｄ恰好是答案。

而Ｂ，如Ｗeiyu所说：“不damage centre-->不impair capability”恰好补充说明了，“damage centre<-->impair capability”加上原题，两者是互为充要条件。尽管如此仍不能解决以上Ｄ中所说的“举例等同”问题。

sdcar2010 · 发表于 2011-3-30 03:58:57

To find a necessary assumption, use negation.

If you negate D, then you get : if there are language centers on the left side of the brain, any serious stroke affecting that side of the brain DOES NOT damage at least one of them. If that is the case, the conclusion is wrong because NOW people who suffer strokes on the left side of the brain but still can talk could have language centers on the left side, then the conclusion of the argument, which is the last sentence, is wrong. Therefore, D is necessary for the argument to hold.

sdcar2010 · 发表于 2011-3-30 05:48:50

If you negate A, you get: No part of a person’s brain that is damaged by a stroke recovers. The argument still holds. So A is not necessary for the arugment to be "logically correct."

ET游戏狂 · 发表于 2014-9-21 23:43:18

sdcar2010 发表于 2011-3-30 05:48
If you negate A, you get: No part of a person’s brain that is damaged by a stroke recovers. The arg ...

A你取反的明显不对嘛怎么能直接把ever拿掉呢？

求问T-9-Q40！！！

所属分类: GMAT考试

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