winny0821

问一个第七题：
The primary purpose of the passage is to

(A) question the validity of an economic model（没有question)
(B) point out some inconsistencies within an economic model(只指出一个inconsistency)
(C) outline an economic model and suggest revisions to it(没有提出revision,还revisions就更不对了)
(D) describe an economic model and provide specific examples to illustrate its use
(E) explain why an economic model remains valid despite inconsistent research results （但是我还是想不通为啥这个是对的？）第一段提出model,举例说明第二段指出一个inconsistency。

请问这个题为啥选E？
Even within national contexts, studies have found more support for the density dependence model when they employ broader geographic units of analysis--for example, finding that the model's operation is seen more clearly at the state and national levels than at city levels.
这句原文的最后一句话怎么译？感觉作者的思路跳来跳去的我没跟上呢，一会指出有inconsistency，一会又说个even within,根本没有递进的关系。所以这道主旨题没有答对，勉强地选了B虽然我知道B不对。。。。