At first, our English teacher spoke English too_____, and we couldn't understand what she said. [ ]

A. quickly  

B. clearly      

C. easily  

D. loudly

破釜沉舟：项羽：史记

A．乐不思蜀：刘禅：三国演义
B．入木三分：颜真卿：聊斋志异
C．草木皆兵：苻坚：晋书
D．图穷匕见：荆轲：春秋