7. 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.
我选B,^^^^
结论是IMMUNE SYSTEM影响了MENTAL HEALTH
前面说IMMUNE ACTIVITY <->MENTAL HEALTH is positively related
但是谁影响谁不知道....所以D排除了MENTAL影响IMMUE, 所以就是IMMUNE影响MENTAL HEALTH了...
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