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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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RON： we're talking about only one KIND of difference (namely, the difference in smelling ability).
the plural "differences" would be correct only if we were actually discussing two or more distinct KINDS of "differences".
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