在中国古代，“文”与“化”联缀使用最早见于先秦时代的《易经》中，“观乎天文，以察时变；观乎人文，以化成天下”。而“文化”一词正式出现是在西汉刘向的《说苑•指武》中，“圣人之治天下也，先文德而后武力。凡武之兴，为不服也；文化不改，然后加诛”。据此可以推知，将"文化"二字合为一词的本义是（    ）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    In a small village，there lived a poor man．He was smart but1,and he never worked. The villagers were so2that they often gave him some useful things. So the man could3with those things.

    One day morning，the man begged(乞讨) from door4door again．He wanted some food．5，he got a large bag of flour(面粉)from an old woman．After he went home，he put the flour into a large pot(罐子)and6it near his bed．Then he went to7．In his dream，he sold the flour at a very good8．With the money，he bought a cow ,and its milk9him more money．He was so happy in his dream that he danced in his sleep．His10hit(碰撞)the pot of flour, and the flour spilt (洒出)all over the floor．The man woke and he felt so sad．

    This thing taught him a lesson：no one can live a good life without working．From then on he worked every day and had a better life．

设a为常数，且$a>1$，$0\le x\le 2\pi$，则函数$f\left(x\right)={\cos }^{2}x+2a\sin x-1$的最大值为（   ）.