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  3. A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental he

A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental he

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问题 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?
选项 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 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D
解析 该研究人员从免疫系统活性水平低与心理健康的低分数的联系中得出结论，免疫系统活性实际上可以抑制心理疾病。如果，与(D)相反，心理疾病可抑制免疫系统的活性，提到的那种联系就不支持该研究人员的结论，因此必须有(D)这个假设。即使免疫系统活性水平高能增加抵御能力不成立，与(A)所述相反，或免疫系统活性水平高能预防心理疾病不成立，与(C)所述相反，正常的免疫系统活性水平仍可以抵御心理疾病。因此，没有假设(A)或(C)。该结论不依赖于心理和肉体疾病的相似之处，因此没有假设(B)。也不依赖于治疗手段的区别，因此没有假设(E)。
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