By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course．

A．are

B．will have been

C．have been

D．will be

《生产安全事故报告和调查处理条例》适用于（）的报告和调查处理。

A、环境污染事故 

B、核设施事故 

C、生产经营活动中的生产安全事故 

D、国防科研生产事故