______ number of visitors were shocked by _____ number of the butterflies(蝴蝶) around the huge tree.

A．A; a

B．The; the

C．The; a

D．A; the

患者高热、寒战3天，咳嗽，胸痛，吐铁锈色痰。查体：右肺中叶有实变体征。抗感染治疗应首选

A．青霉素

B．红霉素

C．林可霉素

D．头孢氨苄

E．四环素