①都是在国家统一，社会稳定时出现的  ②都在思想文化上实行高压政策  ③统治者都注意调整统治政策  ④都重视生产技术的改进。

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    Mr. Smith lived in a big city. When he retired(退休), he bought a small 1in a village near the sea. He2it and hoped to live a quiet life in this house.

    But to his great surprise, many visitors came to see his house in summer holidays, for it was the most 3building in the village. From morning to night there were 4outside the house. They kept looking 5the rooms through the windows and many of them even went into Mr. Smith's garden. This was too much for Mr. Smith. He decided to ask the visitors to 6. So he put a notice (告示) on the window. The notice said, “If you want7it, come in and look round. Price: twenty dollars.” Mr. Smith was sure that the visitors could8coming, but he was wrong. More and more visitors came and Mr. Smith had to 9every day taking them around his house.“I came here to 10not to work as a guide,” he said angrily. In the end, he sold the house and moved away.

已知函数$f\left(x\right)$是定义在R上的奇函数，且满足$f\left(x+2\right)=-f\left(x\right)$，当$0\le x\le 1$时，$f\left(x\right)=\frac{1}{2}x$，则满足$f\left(x\right)=-\frac{1}{2}$的x的值是（   ）

如图是由一些相同的小正方体构成的立体图形的三种视图，则构成这个立体图形的小正方体的个数是（　　）