I haven’t seen______ this since I collected stamps.

A．as beautiful a stamp as

B．so anbeautiful stamp as

C．stamp as beautiful as

D．as anbeautiful stamp a

女性，32岁。发热、腰痛、尿频、尿急1个月，近3天全身关节酸痛、尿频、尿急加重。查体：体温39.5℃，白细胞13×10⁹/L，中性粒细胞0.86，尿培养大肠埃希菌阳性，诊断为大肠埃希菌性尿路感染。治疗应首选（）。

A.青霉素

B.红霉素

C.灰黄霉素

D.头孢曲松

E.林可霉素