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.
我已明白Ｄ是ASSUMPTION，但请问Ａ和Ｃ有什么问题？
A. High immune-system activity protects against mental illness better than normal
immune-system activity does.
immune-system 高，mental health高
A取非：immune-system 高，mental health低，weaken结论
C. People with high immune-system activity cannot develop mental illness.
C取非：immune-system 高，mental illness高，weaken结论
请大牛帮忙！谢谢！
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