There are _____ people here in the city.  But only _____ people of them are Chinese.        [ ]

A. million of; two millions    

B. millions of; two million

C. millions of; two millions  

D. million of; two million

下列（）属于建筑结构应满足的结构功能要求。

A.安全性

B.适用性

C.耐久性

D.耐火性