His efforts ended in _____ . That's to say, he is _____ as a nurse. [ ]

A. a failure; a failure

B. a failure; failure

C. failure; a failure

D. failure ;failure

小丽同学用厨房的药品做了一个实验：在一只玻璃杯中加少量碳酸钠粉末，然后向其中倒入少量食醋，立即有大量的气泡产生．据此你可以提出哪些与化学有关的问题？