I've got _____ uncle,  but I haven't got _____ aunt. [ ]

A. a; an

B. an; a

C. a; a

D. an; an

婴幼儿上呼吸道感染的临床特点是()

A．全身症状重，局部症状轻

B．以呼吸道症状为主，咳嗽，吐痰，呼吸加快

C．全身症状轻，局部症状重

D．以鼻咽部症状为主、鼻塞、流涕、咽痛

E．全身症状重，局部症状重