OG 48 B为什么不对？

gonghao

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 ilness as well as against physical disease.

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.

B为什么不对？

sen4sun

因为题目没提到  physical disease's effects on body systems 是什么. 所以就算以 Mental illness is similar to physical disease in its effects on body systems. 为假设前提,也等于什么都没假设. 因为你把 mental illness's effct on body systems 和一个我们不知道的东西做比较.