According to one expert, it is not so much that the cause of genetic irregularities in many breeds of dog is their being bred for looks or meeting other narrow criteria so much as that the breeds have relatively few founding members.
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ypheroin 2015-12-10 19:40:27
not so much... so much as, 虽然形式上是构成了that the cause 与that the breeds的对比平行，但二者在语义上不具备对比的可能，一个是愿意，另一个是一种品种。而正确选项中是dogs与breed，则是相同类型的对比。
