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     My name is Chen Yang. I'm twelve years old. I'm a Chinese student.

     There are four people in my family—my father, my moth er, my brother and I. My father is a doctor at the City Central Hospital and my mother is a theatre manager. My brother is a student, too. He is thirteen. We are in the same school, but not in the same class.

I like English very much. I can speak a lot of English. I want to have an American pen friend. Let's be friends, OK? Please write to me. My address is No. 22 Middle Sc hool, Hunan, China. My email is Cheny @ hotmail. com.

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计算：（$\sqrt{3}$﹣3）⁰﹣$\sqrt{12}$+$\sqrt{{\left(1-\tan 60°\right)}^2}$．

在中国古代历史中逢有重大政治和社会事件，有勒石刻碑、铸鼎纪事的传统。下图的南京大屠杀死难者国家公祭鼎详细记载了南京大屠杀的事实及痛悼。这体现了（    ）