You can't see the___________ now for they are having a meeting at the moment.

A．editor-in-chiefs

B．by an hour

C．by hour

D．each hour

脊柱裂可分为哪几类（）

A.脊膜膨出

B.脊髓膨出

C.脊髓神经膨出

D.脑脊液膨出

E.脊髓脊膜膨出