prep2-40 表语从句

40.        (26538-!-item-!-188;#058&003184)

According to one expert, the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria as that the breeds have relatively few founding members.

(A) the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria

(B) the cause of genetic irregularities in many breeds of dog is not as much their being bred for looks or meeting other narrow criteria as much

(C) it is not so much the cause of genetic irregularities in many breeds of dog that they are being bred for looks or meeting other narrow criteria as much

(D) 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

(E) it is not so much the cause of genetic irregularities in many breeds of dog to be bred for looks or to meet other narrow criteria

这里CDE里的it怎么错啦？看不出来啊

这句话啥意思啊？能翻译一下吗？

According to one expert, the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria as that the breeds have relatively few founding members.

专家说啊，很多的狗种呢都有基因不规则（变种？）的现象，造成这种现象的原因更多的是因为，不同的狗种的基数比较小（意思可能是不稳定吧，期待生物学大师解释一下），而不是因为这些狗狗们被有意的朝某个方向喂养，这种喂养的目的是为了让狗狗们具备某些外观或者其他的特征

for looks和to meet criteria 这个真的比较难判断的

不过要记住平行的最低要求是功能一样

还有记住not so much that...as that...