$\overrightarrow{AP}$ =x $\overrightarrow{AB}$ ， $\overrightarrow{AQ}=y\overrightarrow{AC}$ ，记y=f（x）．

十八届五中全会闭幕后，各地民主党派纷纷组织学习全会精神，大家表示要把思想统一到十八届五中全会精神上来，把力量凝聚到完成“十三五”规划的目标任务上来。这说明（   ）

①人民政协是社会主义协商民主的重要渠道   

②坚持党的领导是多党合作的首要前提

③人民政协履行管理国家和社会事务的职能  

④***与各民主党派通力合作

    Mrs Smith's living room is large. There is a television in the room. The television is near the window. There are some magazines on the television. There is a table in the room. There are some newspapers on the table. There are some armchairs in the room. The armchairs are near the table. There is a stereo in the room. The stereo is near the door. Mrs Smith often listens to music from it.