Naturally a smile ________ the eyes participate is extremely communicative.

A．to which

B．in which

C．at which

D．with which

肺脓肿与癌性空洞继发感染的鉴别主要是()

A.咳嗽，咯脓痰

B.血的白细胞检查

C.发热的轻重

D.脓痰的多少

E.X线检查或痰液细胞学检查