It’s hot in the shopping mall, because the air-conditioning system ______.

A．broke up

B．broke down

C．broke in

D．broke out

王某，男，49岁。头痛且空，眩晕耳鸣，腰膝酸软，神疲乏力，滑精，舌红少苔，脉细无力。其治疗应首选的方剂是（）

A.天麻钩藤饮

B.通窍活血汤

C.加味四物汤

D.当归补血汤

E.大补元煎