A.      prevented from dissipating its acoustic energy as a result of

B.  prevented from having its acoustic energy dissipated by

C.  its acoustic energy prevented from dissipating by

D.  its acoustic energy prevented from being dissipated as a result of

E   preventing its acoustic energy from dissipatingby

E the best  ，为何选E？很难明白~~另外前面的讨论出现过这个：

这句话的原文都可以找到，来自98年的纽约时报

Sound can travel through water for enormous distances, prevented from dissipating its acoustic energy by boundaries in the ocean created by water layers of differing temperatures and densities.

那是否证明答案应该选c?

同样困惑！~

不过C项这种句末结构怪怪的。。。

应该选C。E逻辑上有误。sound不可能prevent its acoustic energy from

dissipating. C应该算是独立主格结构。翻译为：海水由于受到海底不同气温和密度而形成的分层，产生了boundaries（层与层之间的界限）. 这种界限阻止了声能的消散，进而使得声音在水中可以传播很远的距离。