GMAT逻辑题目:

　　The brains of identical twins aregenetically identical. When only one of a pair of identical twins is aschizophrenic, certain areas of the affected twin’s brain are smaller thancorresponding areas in the brain of the unaffected twin. No such differencesare found when neither twin is schizophrenic. Therefore, this discoveryprovides definitive evidence that schizophrenia is caused by damage to thephysical structure of the brain.

　　Which one of the following is anassumption required by the argument?

　　(A) The brain of a person suffering fromschizophrenia is smaller than the brain of anyone not suffering fromschizophrenia.

　　(B) The relative smallness of certain partsof the brains of schizophrenics is not the result of schizophrenia or ofmedications used in its treatment.

　　(C) The brain of a person with an identicaltwin is no smaller, on average, than the brain of a person who is not a twin.

　　(D) When a pair of identical twins bothsuffer from schizophrenia, their brains are the same size.

　　(E) People who have an identical twin areno more likely to suffer from schizophrenia than those who do not.

　　参考答案：B

　　思路：

　　题干：assumption

　　原文：If one schizophrenic，then one smaller。If neither schizophrenic, then no difference. Conclusion: damage to physical structure cause schizophrenic

　　核心词：schizophrenic 注意：比较是在twin中进行的

　　我的习惯是从下到上地看选项。

　　E 无关项

　　D 原文没有的信息

　　C扩大了比较范围

　　A 扩大了比较范围

　　B：无他因

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