79、Though certain breeds of dog are renowned for their sense of smell, there
is often a greater difference in scenting ability between two members of a single breed as there is between members of different breeds.
(A) is often a greater difference in scenting ability between two members of a single breed as there is
(B) is often more difference in scenting ability between two members of a single breed as to find one
(C) is often a greater difference in scenting ability between two members of a single breed than
(D) are often greater differences in scenting ability between two members of a single breed as there are
(E) are often greater differences in scenting ability between two members of a single breed than there is
原文意思: 虽然不同的狗嗅觉都很有名, 但是在一个 breed 的 member 和不同 breed 的 member之间区别还是前者大。
题目分析: 有一个比较的并列, 由于前面用的 greater 或 more 后面用 as 就不可以了, 只有 c 和 e 留下来。E 后面用 there is 但是前面用 are often greater difference 与后面的 there is 不对应,选 C。