My sister doesn't like doing the housework athome. She usually_____ much time shopping in the

supermarkets.[ ]

A. spends  

B. costs  

C. takes  

D. pays

手术野污染途径描述错误的是

A．手术器械及物品

B．手术人员的手臂

C．病人手术区皮肤

D．感染病灶或空腔脏器内容物

E．以上均不是