1.        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

答案是A,但我觉得D没错啊,D对比的是protect the few 和 pretect the significant number,while表示对比,请NN指点,多谢啦

个人的感觉是

1。表示相同性的话，还是用like和as。。表示有转折意味的对比才用while

2。while前后的结构不对称。一个是 to..., +主句 一个是主句+to do

这道题应该是比较的两个过程,而不是两个事物.

因为polio vaccine并不是protect eating habbits,而是防止一种疾病的.

所以用as比较两个过程:

也就是说:

polio vaccine 对应 polio  相当于  mass dietary change对应protect from eating

habbit