熔炼铸铁常用（）。

A.工频感应炉

B.电弧炉

C.冲天炉

D.平炉

E.坩埚炉

---I’m going on a trip to Hongkong after the exam.

---Really? ___________!

A．Have a nice time

B．Congratulations

C．OK

D．It’s nice of you