大全253，未讨论！

253   Dr. Hegsted argues that just as polio vaccine is given to every person to protect the few who might actually contract polio, mass dietary change is needed to protect the significant number who are susceptible to the life-threatening effects of press eating habits.

(A) just as polio vaccine is given to every person to protect the few who might actually contract polio

(B) like polio vaccine, which is given to every person to protect the few who might contract polio

(C) similar to polio vaccine which is given to every person in order to protect the few who might actually contract polio

(D) while, to protect the few who might actually contract polio, polio vaccine is given to every person（A）

(E) similar to the giving of polio vaccine to every person in order to protect the few who might contract polio actually

我的问题是，根据as和like的用法分别接名词和句子，那为什么b不正确呢？

这里B用like的意思是错的. 楼主在仔细体会一下句子的比较.

mass dietary change  是一种手段，不是一个东西

这个手段和注射疫苗类比

正确答案是A?

as和like的用法分别接名词和句子是表象，做题时可以迅速派出一些明显错误的选项，但是当你遇到有些时候很难判断时，就要看句意实在比较名词（用like），还是在比较动作（有谓语出现，用as）。注意，这里讨论的是单个as ，和as。。。as。。。又有不同，你可以看看语法点链接，置顶有。

猪宝宝耍剑，看看语法点链接，置顶有。？

我怎么没看见呢？语法廉洁

right here

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=81945&page=1

再顶出来！

请问D为什么不对呢？？？

不知道是不是我学到太晚，脑子木了呢？怎么都没一个人有这个问题呢？