His glasses,   ____ he could see nothing, fell on the ground and broke.    [      ]

A. without which    

B. with which    

C. for which    

D. by which

在警察的两种基本职能中，( )通常置于首要地位。

A．政治 * * 职能
B．社会管理职能
C．惩处犯罪
D．维护社会治安