How many nationalities ______ the  country   ______？ 

A．is； consisted of

B．does； make up

C．is； made from

D．does； consist of

普通硅酸盐42.5水泥3d抗折强度应满足（）MPa。

A.2.5Mpa

B.3.0MPa

C.3.5MPa

D.4.0MPa