— How much do you know about the 3D film technology?

— A little. Not until _____ the hot movie Avatar ______some about it.[      ]

A. did I see; did I begin to learn    

B. I saw; I began to learn

C. I saw; did I begin to learn        

D. did I see; I began to learn

湿式报警阀调试时，在试水装置处放水，当湿式报警阀进口处压力大于0.14MPa，放水量大于（）时，报警阀应及时启动。

A、1l/s

B、2l/s

C、2.5l/s

D、5l/s