If someone has to     an action or policy, they are responsible for it, and may be  required to explain it to other people or be punished if it fails．

A．account for

B．make up

C．focus on

D．pay off

肾盂。肾炎最常见的感染途径是()

A．外伤

B．邻近器官炎症的蔓延

C．上行感染

D．血行感染

E．淋巴管蔓延