记录龋病常用的指数有（）
A.龋失补指数
B.龋均
C.患龋率
D.龋病发病率
E.无龋率
参考答案：A, B, C, D, E
Today, ____ rapid transportation and communication, the whole world seems to be smaller．
A．regardless of
B．in spite of
C．because of
D．instead of
不完全花
