问道逻辑题：og_11_v07

red1358

Aresearcher discovered that people who have low levels of immune-system activitytend to score much lower on tests of mental health than do people with normalor high immune-system activity. The researcher concluded from this experimentthat the immune system protects against mental illness as well as against physical disease.

Theresearcher’s conclusion depends on which of the following assumptions?

(a)  High immune-system activityprotects against mental illness better than normal immune-system activity does.

(b)  Mentalillness is similar to physical disease in its effects on body systems.

(c)  People with high immune-systemactivity cannot develop mental illness.

(d)  Mentalillness does not cause people’s immune-system activity to decrease. (D)

(e)  Psychological treatment of mentalillness is not as effective as is medical treatment.

我的问题是：提干前面一直都是在说mental health,最后加了as well as against physical disease.我觉得这里有个gap,所以选了B。请大家帮忙解释一下提干里的physical disease.
谢谢咯！

red1358

是不是不用管这里的physical disease?