以下是引用dennyhuang在2007-4-17 15:32:00的发言：7. A researcher discovered that people who have low levels of immune’ system activity tend to score much lower on tests of mental health than do people with normal or high immune’ system activity．The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease． The researcher's conclusion depends on which of the following assumptions? (A) High immune-system activity protects against mental illness better than normal immune, system activity does． (B) Mental illness is similar to physical disease in its effects on body systems. (C) People with high immune-system activity cannot develop mental illness· (D) Mental illness does not cause people's immune-system activity to decrease. (E) Psychological treatment of mental illness is not as effective as is medical treatment. Reasoning: immune-system activity can inhibit mental illness as it does physical illness．While it is possible that mental illness might itself depress immune-system activity, the researcher assumes that this is not the case．If mental illness caused a decline in immune-system activity, then lower levels of immune-system activity would be expected as a result，and the higher levels would merely indicate the absence of illness rather than any effect on illness. 求救！想了一段时间了，总不能理顺逻辑关系。看了答案觉得有些道理，但自己做题时一点都没想到。 原题意：免疫系统低的人在精神健康的得分比免疫系统一般或高的人低，所以免疫系统保护精神健康和身体健康。问题：该结论前提。 我选的是B  以下是引用lqn0621的发言： 开始读题的时候和你的想法是一样的，以为是断桥型题目，直接找出精神健康和身体健康之间的关系就可以了 但是B选项的构造有一些问题， Mental illness is similar to physical disease in its effects on body systems. 前半句是没有任何问题的（smilar构成了“桥”），但是看后半句 in its effects on body systems 题中有没有提到body systems 的问题？没有，也就是说B选项将神健康和身体健康之间搭建了一座错误桥梁，所以迷惑性很大） 事实上 桥梁应该搭在，experiment与精神健康和身体健康之间，也就是说assumption是 low score on mental illness also means low score in physical illness 可是想到这里对应选项发现没有这个意思的。 这时候看到CDE 都是选项带not，不由联想到 “取非削弱” (D) Mental illness does not cause people's immune-system activity to decrease. 如果取非为，mental illness 会引起人们i-s活动性的下降。 那说明什么？题中所说的 . people who have low levels of immune’ system activity tend to score much lower on tests of mental health than do people with normal or high immune’ system activity．.事实上因果倒置了 也就是score高低根本推不出mental health。则削弱了结论。 这里部下的陷阱是什么？是physical health的提出是没有用到的，是迷惑我们的。没有他存在，这道题也是选D GMAC出题诡异狡猾之处可见一斑。 明白了，就是说如果mental illness会引起i－s的下降，高i－s只能说明mental illness小，不能说明i－s能预防mental illness。 但lqn0621说的因果关系我不太明白，你是假定了低免疫导致低精神健康吗？我觉得高score可以推出mental illness小，从而mental health好。 不过又学了两招，搭桥和取非削弱。8错。上回追梦说我上次问的问题是明显的搭桥问题，我还有些范迷糊，不知道啥是搭桥，这次都明白了。谢谢呀！不过假设前提类型的题就这两种可能吗？
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