南宋谚语“苏湖熟，天下足”表明我国古代的经济重心发生了转移，其方向是（　　）

若 $f\left(x\right)={\sin }^{3}x+a{\cos }^{2}x$ 在 $\left(0,\pi \right)$ 上存在最小值，则实数 $a$ 的取值范围是（    ）

中共中央办公厅、国务院办公厅印发《关于完善审计制度若干重大问题的框架意见》，探索省以下审计机关人财物管理改革，保障依法独立行使审计监督权。这一举措有利于（    ）

①扎紧制度笼子，有效制约和监督权力运行

②更好地发挥审计在行政监督体系中的作用

③促进审计监督客观公正，提高司法公信力

④保证审计工作不受任何机关、团体的干预

    I climbed mountains with my friends last Sunday. It was very hot. When we climbed halfway up the mountain, we were very hungry and thirsty. We decided to have a rest. My friends bought some water and fruit. I brought some bread and milk. We were very happy. Finally, we were on the top of the mountain. But my hat was flew away. I was sad

    It was a happy and sad day.