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.
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Ais often a greater difference in scenting ability between two members of a single breed as there is
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Bis often more difference in scenting ability between two members of a single breed as to find one
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Cis often a greater difference in scenting ability between two members of a single breed than
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Dare often greater differences in scenting ability between two members of a single breed as there are
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Eare often greater differences in scenting ability between two members of a single breed than there is
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正确答案: C