---- My parents said that we would take a camping on May Day.

-----_____ it rains then?

A．What if

B．What about

C．What for

D．So what

当今的核电站是通过            （选填“重核裂变”或“轻核聚变”）来释放核能的，如图9为核电站发电流程图，在核电站发电过程中，能量转化的先后顺序是：核能、_______能、_______能、电能。