The manager has offered us a two-week holiday to Beijing next month.

I have been looking forwarding to it.

A．Good idea!

B．Don’t worry

C．Oh really?

D．why not

下列哪种煤气属于无色无味剧毒（）。

A.转炉煤气

B.焦炉煤气

C.高炉煤气

D.氧气