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qiuxiaofei · 发表于 2003-11-6 19:47:00

第103题
The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophrenic, certain areas of the affected twin’s brain are smaller than corresponding areas in the brain of the unaffected twin. No such differences are found when neither twin is schizophrenic. Therefore, this discovery provides definitive evidence that schizophrenia is caused by damage to the physical structure of the brain.
If the statements on which the conclusion above is based are all true, each of the following could be true EXCEPT:
(C) The brains of schizophrenics share many of the characteristics found in those of people without the disorder
(D) It will eventually be possible to determine whether or not someone will develop schizophrenia on the basis of genetic information alone
(E) Brain abnormalities associated with schizophrenia are the result of childhood viral infections that inhibit the development of brain cells
这道题连同选项不知如何去理解

第107题
Because of the recent transformation of the market, Quore, Inc., must increase the next two years, or it will certainly go bankrupt. In fact, however, Quore’s production structure is such that if a 10 percent productivity increase is possible, then a 20 percent increase is attainable.
If the statements above are true, which one of the following must on the basis of them also be true?
(B) Quore will not go bankrupt if it achieves a productivity increase of 20 percent over the next two years.
(E) If a 20 percent productivity increase is unattainable for Quore, then it must go bankrupt.
D为什么不对.E为什么对:增长不到20%就不会到10%,可是不说明不增长5%或6%之类啊,题干只说要么增长,要么破产,并未说必须增长10%以上才可能不破产呀

谢谢,哪位大牛帮忙解答一下啦!

mindfree · 发表于 2003-11-7 13:44:00

103. D

D is in conflict with the evidence, which says that physical damage contributes to the disease. So it cannot be true that prediction can be made soly on the basis of genetic information.

For "could be true except" type of question, you need to find the one that conflicts with the facts or conclusion in the argument. In another word, even if one statement has absolutely no relationship with the facts or conclusion, as long as it is not inconflict with them, it could be right. For example, I can say that "identical twins always look very alike". It bears no relationship but it could be true.

The above exmple is only an extreme one. Normall GMAT gives choices that somewhat connect to the facts and conclusion. For example, if C could not be right, the argument must have a conclusion that the brains of schizophrenics share no common features as those without the disorder, or the brains are totally unalike. It is never said in the argument.

107. Explained before. Please look for it. I kinda agree with you that an increase less than 10% might be enough. But B is definitely wrong.

dandan74 · 发表于 2003-11-7 15:30:00

Fore 107, 我觉得题目可能漏了must increase by 10%

qiuxiaofei · 发表于 2003-11-7 18:24:00

谢谢总教头的指点,我对"could be true except" 类题有了质的认识.谢谢DanDan74的view,加上mindfree,使我确信了自己的观点.这里真好!

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