In English, certain nouns are spelt with _____capital letter at _____ beginning of the word; for example, names of places, such as the United States of America.

A．a; the

B．the; the

C．a; a

D．the; a

以下哪种水门汀有遇水凝固加快的特点（）

A.氧化锌水门汀

B.磷酸锌水门汀

C.玻璃离子水门汀

D.聚羧酸锌水门汀

E.氢氧化钙水门汀