我又重看了一下,好像应该选D。
因为如果mental illness does cause people's immune system activity to decrease,遍不能得出high level immune system activity can protect against mental illness的结论。所以D是结论成立的前提。 作者: yaningxue 时间: 2015-5-28 08:43
我觉得B也对啊,前半段没提到physical,conclusion就说physical,所以assume physical和mental相似,可是答案不是B。。。。