急性肾炎时应用青霉素是为了（）

A.治疗急性肾炎本身

B.预防肾炎复发

C.防止交叉感染

D.清除病灶内残余的链球菌

E.治疗并发症

After his father died, the boy was _______ by his devoted mother, who attached importance to his education.

A．brought up

B．turned up

C．given up

D．taken up