My students are all quiet.Even after class, my students spend  ___as they can playing outside.

A．as little time

B．little time

C．less time

D．time as little

治疗鼻旁窦炎、鼻息肉时，鼻内镜手术与传统的手术方式相比优点是（）

A.视野清晰

B.操作精细

C.创伤小

D.免除颅鼻面部切口

E.降低复发率