位于牙本质小管的周围，矿化度较高的牙本质称（）
A.管间牙本质
B.球间牙本质
C.前期牙本质
D.透明牙本质
E.管周牙本质
参考答案：E
— They haven''t finished the work up to now .
— Well , he ____ .
A．should have
B．should
C．ought to
D．ought have
________ is waiting for you over there. He wants to say thanks to you.
A．Somebody
B．Anybody
C．Everybody
D．Nobody
