Jack has made great achievements in his work, and the harder he works, the _________ he becomes.

A．religious

B．energetic

C．curious

D．independent

正常停炉时，应逐渐减少（）的供给量，使炉温缓慢降低。

A.空气

B.燃料油或天然气

C.循环水

D.软化水