中国的民政部、劳动社会保障部都属于（）。

A.社会福利与其他公共行政职能混合的行政主管机构

B.社会福利与卫生合并的行政主管机关

C.社会福利与劳工合并的行政主管机关

D.社会福利、卫生、劳工合并的行政主管机关

It's required that the students _____ mobile phones in their school, so seldom ____ them using one.[ ] 

A. should not use; you will see

B. not use; will you see

C. mustn't use; will you see

D. not use; you will see