--- Who are you waiting for?

--- ______ us a lecture this afternoon.

A． The professor wants to give

B． The professor will give.

C． The professor about to give

D． The professor to give.

以下描述正确的是（）

A.口腔癌的流行病学指数为患病率

B.口腔黏膜疾病无法选择流行病学评价指数

C.在我国唇腭裂的流行具有种族差异

D.氟牙症流行无性别差异

E.氟牙症指数是Dean分类法中确定个体损害程度的指数