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 researchers conclusion depends on which of the following assumptions?
A.High B. B．Mental C. C．People D. D．Mental E. E．Psychological F.
【参考答案】
D 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，......