求助OG10-48题

不明白OG10中的逻辑第48题，D对在什么地方？B又错在什么地方？请高人指点。

先把OG解释贴上：

The researcher concludes from the association of low immune-system activity with low mental-health sores that, in effect, immune system activity can inhibit mental illness. If, contrary to D, mental illness can depress immune-system activity, the association mentioned does not support the researcher’s conclusion. So D must be assumed.

Normal immune-system activity could protect against mental illness without high-immune system activity offering increased protection or prevention, contrary to what A and C state, so neither of A and C is assumed. The conclusion does not depend on there being a similarity between mental and physical illness or a difference in treatments, so B and E are not assumed.

原文结论：the immune system =>protects against mental illness

所以assumption就是mental illness不是反作用immune system的。也就是说the immune system =>(作用)protects against mental illness，而不是mental illness=>(作用)the immune system

再贴个讨论贴：

http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=2844418&id=25362&page=1&skin=0&Star=1