Until the noise of the bus ________, we were able to hear the program again. [      ]

A. died from     

B. died out

C. died away  

D. died off

以下选项中（）是衡量砂粗细程度的指标。

A.颗粒级配

B.压碎值

C.亚甲蓝（MB.值

D.细度模数