The police had _______news report written about ______ traffic accidents in the city involving _______ school children.

A．a; the ; the

B．不填；不填；the

C．a; 不填；不填

D．a ; the; 不填

EPON系统中ONU上行传输使用（）nm波长。

A、1310

B、1550

C、1490

D、980