— Do you know whether they talked about their work or their family

— As _______matter of fact, I couldn't hear it clearly, as they talked in ______whisper.[ ]

A. the; a      

B. a; a        

C. the; the          

D. a; the  

在轧钢过程中，为了改善其咬入条件，其措施有（）。

A、增大压下量

B、减少摩擦系数

C、增加轧辊直径