She is a diligent student, and all her spare time she has _____ staying in the library.

A．is spent

B．spent

C．to spend

D．to be spent

对有明显结核症状的病畜奶应（）

A.就地消毒销毁

B.巴氏消毒后作食品工业用

C.高温巴氏消毒后饮用

D.煮沸5分钟后制成奶制品

E.巴氏消毒后喂饲牛犊