OG12 7(CR)

helenlife

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 the effects on body system.
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.

答案是D，但是依然不明白。大家讨论一下。

07170004hjq

条件一：低免疫系统的人 得分低  
结论 免疫系统 保护 精神健康=身体健康

再加一个条件：d: 精神疾病不会导致人的免疫能力下降
才能成立

因为如果精神疾病导致人的免疫能力下降了 那么 免疫系统就不能保护精神健康了

不知道这么说看懂了没有？

helenlife

谢谢，你这么一解释，逻辑就很清楚了。