—______ free education, the poor children in our hometown can go back to school.

—So can the children in our hometown. [     ]

A. Thanks to    

B. Instead of    

C. As for    

D. Towards

在港口与航道工程中，使用的水泥必须符合有关现行国家标准。普通硅酸盐水泥和硅酸盐水泥熟料中的铝酸三钙含量宜在()范围内

A.5%～12%

B.6%～12%

C.4%～12%

D.8%～12%