It was several minutes before I was            of what was happening.      [ ]

A．know                    

B．realize      

C．wear                    

D．aware

乳牙患龋特点（）

A.患龋率高，但范围不大

B.患龋率高，范围广泛

C.发病早、症状明显

D.发展速度慢，急性龋多见

E.龋齿多发，修复性牙本质形成活跃