三条或三条以上的发育沟相交所形成的点状凹陷称为（）

A.窝

B.点隙

C.外展隙

D.楔状隙

E.邻间隙

_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

A．Even if

B．As far as

C．If only

D．So long as