下列说法不正确的是 [ ]

A．与铜质水龙头连接处的铁质水管易发生腐蚀

B．把被保护的钢铁设备作为阴极，外加直流电源可进行保护

C．原电池产生电流时，阳离子移向正极，阴离子移向负极

D．铅蓄电池是最常见的二次电池，正极板上覆盖有Pb

－Do you hear there was _______ fire in the shopping mall last night?

－ Yes. I never thought _______ fire can be so terrible.

A．the; the

B．／; a

C．the; a

D．a; ／