—What were you saying just now?

—________. Let's get down to the English speaking contest tomorrow.[ ]

A. Don't mention it  

B. Take it easy

C. That's all right  

D. Forget it

以下关于索尔维制碱法的描述正确的是(　　)

A．使用的原料为食盐、CO₂、氨

B．精制盐水后应先通入CO₂再通入过量的NH₃

C．析出NaHCO₃后的母液中已无NaCl，只有NH₄Cl

D．索尔维法的缺点是盐利用率只有75%，生成的CaCl₂难处理