大全249-补充250-T175

paopao

175/DQ249.  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 sparest在未划线部分显示其应该指代Listeria bacterium，disease指代listeriosis，afflicts的主语是listeriosis；itz在划线部分逻辑上指代listeriosis，与未划线部分的it指代形成冲突，错。

(B) where it spares

(C) despite sparing

(D) when sparing（E）

(E) while sparingwhile sparing many others是表伴随，与前面的afflicts some people形成对比，意思是说：在污染地区，这种病使某些人深受其害，而让许多其他人却不受影响。

答案没有问题

我的问题是listeriosis, afflicts some people in a contaminated area though it spares many others.是作什么成分在句中

如果作疾病的同位语要用

listeriosis that afflicts some people in a contaminated area though it spares many others.

谢谢

sofarsgood

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.

我看listeroisis 是disease 的同位语，整个句子结构是：

Doctor know little about how...and why the disease...,listerriosis, afflicts some people....

paopao

谢谢sofarsgood
明白了

sofarsgood

不客气。