唐朝的哪座城市，既是当时各民族交往中心，又是一座国际性的大都市（     ）

填入下面文字横线上且与下文衔接最恰当的一项是（     ） 。

事实上，水是一个整体，河流只是水的一个成长阶段， ①              ，  ②                     一瞬间才算完成它的生命过程。水的成长方式从一开始便呈现出智慧的思考，   ③                        。

廖某通过虚报蔬菜大棚面积骗取国家财政补贴资金123.33万元，造成国家重大经济损失。近日，海南省第二中级法院对骗取补贴的廖某作出宣判，维持一审法院判决，以诈骗罪判处廖某有期徒刑12年，并处罚金10万元。回答下列问题

      During the weekend, I usually like to 1at home, but sometimes I like to go out for a walk2  play football. My friend Jack works hard3the week. At the weekend, he always goes to4   his uncle and aunt work on their farm with his family.The5is not very big, but there is always so much to6  on a farm. The children look7 the animals and give them food. Jack and his wife help8  the fields. At the end of the day, they are all9 and tired. After Jack’s aunt10 them a big meal, they to back home in a car.