Welcome to our online mall! If you buy ______iphone4 here, you can get a watch for _____free.

A．a; /

B．an; the

C．an; /

D．the; the

患者，男，30岁，右下腹持续隐痛，轻度阵发性加剧，有轻度发热，恶心，胃纳不香，大便干结，小便微黄，苔白厚腻，脉弦滑，宜选（）

A.芒硝

B.大黄

C.火麻仁

D.商陆

E.石膏