Out of the crowded bus ______, who was dressed in a black suit, waving to a woman.

A．a tall man stepped

B．stepped a tall man

C．did a tall man step

D．a tall man did step

男孩，8岁，尿频尿痛3天。体查：T36.8℃，双侧肋脊角有压痛。

如果该患者诊断为上行性感染引起的膀胱炎，应选用哪类抗菌药物（）

A.尿浓度高的药物

B.血浓度高的药物

C.肾组织浓度高的药物

D.青霉素类

E.联合氨基糖苷类+头孢菌素类