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　　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。

　　通过上面GMAT语法题解法可以看出，我们首先需要理解句子的意思，然后再来举例分析每一个选项，运用排除法将明显的错误排除，而后再细细琢磨剩下的选项，距离正确答案就不远了。

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