In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish's habitat.
题目解答
历史版本-1 由shirleyli5更新于2013-09-06 15:57:49
numbers可以指同类生物有很多
A,B,C都存在与非划线部分不平行。
D是不够简洁，adj.比定从更好。
所以选E. BY...,BY..., and BY...
