标题: 补充250-175 [打印本页] 作者: ccfish 时间: 2004-1-24 05:49 标题: 补充250-175 175. Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others. (A) though it spares (B) where it spares (C) despite sparing (D) when sparing (E) while sparing