It was one of those days when it looked at first something interesting could happen, but then later, when you didn't expect anything, almost everything happened.

A．nothing

B．anything

C．everything

D．all things

面盒形洞，一般应深入牙本质内（）

A.0.2～0.5mm

B.0.5～1mm

C.1～1.5mm

D.1.5～2.0mm

E.2～2.5mm