You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.

A．affected

B．interrupted

C．involved

D．disturbed

根据生产安全事故造成的人员伤亡或者直接经济损失，事故可分为（）等级。

A、特别重大事故；

B、重大事故；

C、较大事故；

D、一般事故