教育承载着国家的未来、人民的期盼。阅读材料，回答问题。

材料一：《国家中长期教育改革和发展规划纲要（2010年一2020年）》指出，促进公平是我国的基本教育政策。教育公平的基本要求是保障公民依法享有受教育的权利，关键是机会公平，重点是促进义务教育均衡发展和扶持困难群体，根本措施是合理配置教育资源，向农村地区、边远贫困地区和民族地区倾斜，加快缩小教育差距。教肯公平昀主责任在政府，全社会要共同促进教育公平。

材料二：教育部办公厅近日下发了《关于做好201 6年城市义务教育招生入学工作的通知》，明确提出在教育资源配置不均衡、择校冲动强烈的地方，根据实际情况积极稳妥采取多校划片办法（指一个小区对应多个学校。将热点小学、初中分散至每个片区，确保各片区之间大致均衡）。

根据下列短文，选择最佳选项。

    Sam likes soccer. He always watches soccer games on TV. His wife (妻子) Nina likes watching TV plays (电视剧). One evening at 7:00, Sam watches an interesting soccer game on TV. The TV also has a good TV play. It is Nina's favorite. She wants to watch it very much, but Sam sits before (在……之前) the TV. He doesn't let Nina watch the TV play. Nina is not happy, so she goes to her mother's home at 7:30 in the evening. When she comes into her mother's home, her father watches that soccer game, too.     

     “Where is my mother, Dad?”asks Nina.

     “She goes to your grandma's home,”says her father.

     “Why?”

     “I want to watch the soccer game, but she likes to watch a TV play.”

小华想用空易拉罐来证明大气压强的存在，下列操作能达到目的的是（）

A=$\left(\begin{array}{cc}2& -1\\ -3& 3\end{array}\right)$，f（x）=x²﹣5x+3，E为两阶单位阵，定义f（A）=A²﹣5A+3E，则f（A）=____ ．