Www.sda.gov.cn, which has _____food and drug channel with clear explanations, is  _____very popular website.

A．a, a

B．a, the

C．the, /

D．/ ; a

血尿伴剧烈腹痛最常见于 ( )

A．膀胱结核
B．肾炎
C．肾肿瘤
D．泌尿系结石
E．以上都不是