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? 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. eople with high immune-system activity cannot develop mental illness. D. Mental illness does not cause people’s immune-system activity to decrease. E. sychological treatment of mental illness is not as effective as is medical treatment. 作者: bettyofarim 时间: 2003-11-14 11:58
选D是吗？如果Mental illness cause people’s immune-system activity to decrease，那原文的immune system protects against mental illness 就不成立了作者: Eleanoryf 时间: 2003-11-14 12:37 标题: yes, you get it. 请问，你是如何分析的？ 是不是用取非，来判断是否是必要选项的？/作者: bettyofarim 时间: 2003-11-14 13:03
做assumption的，如果取非的话，那么原文必不成立。我个人觉得assumption可以起到桥梁的作用吧。
eople with high immune-system activity cannot develop mental illness.