[問題]OG48

由 **Clara** » 2005-04-22 06:58

48. 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?

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.

先說我的理解
題目給個發現:低免疫系統導致低心理健康
然後加上某個assumption
可以推導出下列結論:免疫系統幫助人們對抗心理疾病和生理疾病

我之前2次都選了B;因為我想不是要緊扣住"結論的環節"嗎?
既然conclosion部分提了生理疾病....是否就該跟生理相關呢???

我最不會的就是og用"反推"去solve
The researcher concludes from the association of low immune-system activity with low mental-health sores that, in effect, immune system activity can inhibit mental illness. If, contrary to D, mental illness can depress immune-system activity, the association mentioned does not support the researcher’s conclusion. So D must be assumed.
我頭腦轉不過來
D給心理疾病不會造成人的免疫系統下降
看了解答還要想一下才理解
如果以反推
我覺得c也不賴
C給高免疫系統不會產生心理疾病
如果高免疫系統導致心理疾病
那麼就無法做個conclusion"免疫力保護心理與生理"

以上是我的思路
還請指點迷津

由 **Calvin** » 2005-04-22 08:13

請記得把A、E選項也貼全了，謝謝先！

當妳選出了妳的正確答案後，不妨用「取非」（也就是妳說的反推）來驗証自己的答案

把B取非後-->Mental illness is UNsimilar to physical disease in its effects on body systems. 對結論完全沒有影響，結論依然可以成立。

事實上，BE都是無關選項，題目說的是immune system跟mental illness的關係，B的疾病症狀、E的治療方法效果與原題論述無關，妳其實是要馬上排除的。

而且題目說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.所以A、C專注在講HIGH-IMMUNE SYSTEM上，是不合適的。

看到D，如果mental illness can decrease immune system的話，那麼原題的事實：low immune system---->mental illness，就會有問題了，有可能是high immune system 的人還是有 mental illness，因為mental illness 會decrease immune system，才出現了low immune system and mental illness研究發現的現象。這就完全反駁了結論了。故D才是最重要的前提假設。