已知在一定条件下能发生下列反应：N₂＋3Mg ＝ Mg₃N₂（固），空气缓缓通过下图装置时，依次除去的气体是（   ）

A．CO₂、N₂、H₂O、O₂　　

B．CO₂、H₂O、O₂、N₂

C．H₂O、CO₂、N₂、O₂　　

D．N₂、O₂、CO₂、H₂O

A．(A) Because we often take our ability of listening for granted.

B．(B) Because we are surrounded by all sorts of noises.

C．(C) Because we do not spend much time listening.

D．(D) Because we do not attach great importance to listening.