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题库 / Prep2007E1-SC-112
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.
is often a greater difference in scenting ability between two members of a single breed as there is
is often more difference in scenting ability between two members of a single breed as to find one
is often a greater difference in scenting ability between two members of a single breed than
are often greater differences in scenting ability between two members of a single breed as there are
are often greater differences in scenting ability between two members of a single breed than there is
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另外比较的时候，被比较部分省略名词的单复数与比较部分必须一致，如果单复数不一致，需要补出名词。如：
Wrong: Her company did better last year than those of her competitors.
Right: Her company did better last year than the companies of her competitors.
之于本题，前面是a greater difference, 后面做了省略，则宾语也是a difference，表示三个或以上成员之间的差异程度也只有一个（联想数学里的范围概念，用最大的减最小的）
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