prep2-51 又是代词 痛

51.        (27188-!-item-!-188;#058&003462)

Studies that have compared the different types of insects in coffee plantations and tropical forests have reported either finding a similar or a
            greater variety in plantations.

(A) and tropical forests have reported either finding a similar or a

(B) with those of tropical forests have either reported finding a similar or

(C) with those in tropical forests have reported finding either a similar or a

(D) to tropical forests have either reported finding a similar or

(E) to those of tropical forests have reported either finding a similar or

关于E中those的指代，prep解释说those可能指代 the different types of insects ，所以产生比较不对等，可是those属于中心词指代，怎么能指代修饰语呢？

首先，E最大的问题是compare "to"用的不对

其次，即使用了with, 我想大概解释的意思是说"those of"（注意后面跟的是"of"）会让人产生印象指代的是“deferent types (of)"而不是"insects",结果就产生了“types of insects”和“types of tropical forests（代入those那边)”比较，所以不对等。

不知道说明白了没有

哦哦，好象是这样的哦。多谢拉

请问C选项，either a similar(=adj.) or a greater variety (=noun) ,either adj or noun能平行吗？

是不是 similar 后面省略 variety ?either a similar (variety )or a greater variety?

thanks