（）电动机的结构形成分为干式、半干式、充油式和湿式四种。

A．潜水泵

B．离心式井泵

C．离心式油泵

D．屏蔽泵

I was shocked ______ the cruelty of Tom, a relative of my wife, who not only shouted ____ the

poor man begging for something to eat but also let his violent dog come _____ him. [ ] 

A. at; at; at

B. with; to; at

C. by; to; at

D. for; at; to