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. 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.
48.
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.
我想到吐血，也想不到会选这个答案呀，怎么也想不明白呀，牛人能帮忙解释一下么，谢了
原文推理：免疫力低，精神健康差。所以免疫系统也免疫精神病。
D排除他因。即不是精神健康差导致免疫力低。将D取非，精神病引起免疫能力下降。则不能从原文现象得出原文的结论。
建议：别用“跪谢”之类的词，都不敢回你的贴啦。
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