按要求改写句子。 

(1)蓝天衬着高耸的巨大的雪峰。  

    缩句：                                                                                                  

(2)姐姐是老师。  

    扩句：                                                                                                  

(3)爸爸打开了电视。   

“被”字句：                                                                                             

“把”字句：                                                                                            

(4)泉水靠着右边慢慢地缓缓地流着。  

     改病句：                                                                                             

下列哪一项不属于公安机关必须依法履行的职责( )

A．管理集会、游行、示威活动

B．惩治投机分子

C．维护国(边)境地区的治安秩序

D．组织、实施消防工作