Kelly works in a restaurant as a waitress in her spare time， so we can say she does a ________ job.

    Attention from strangers is nothing new to me. Questions about my height is the center of almost every public interaction. My friends say my height is just a physical quality and not a personality aspect. However, when I reflect on my life, I realize that, my height has shaped my character in many ways and has helped to make me who I am.

    I learned how to be kind. When I was younger, some parents in my neighborhood regarded me kind of dangerous because I was so much larger than other children my age. I had to be extra welcoming and gentle simply to play with other children. Of course, now my coaches wish I weren't quite so kind on the basketball court.

    I learned the quality of not being too proud about myself. At 7 feet tall, everyone expects me to be an amazing basketball player. They come expecting to see Dirk Nowitzki, and instead they might see a performance more like Will Ferrell(successfully starred a professional basketball player). I have learned to be modest and to work even harder than my fellows to meet their (and my) expectations.

    I developed a sense of lightheartedness. When people playfully make fun of my height, 1laugh at myself too. On my first day of high school, a girl dropped her books in a busy hallway. I got down to her level and gathered some of her notebooks. As we both stood up, her eyes widened as I kept rising over her. Astonished, she dropped her books again. Embarrassed, we both laughed and picked up the books a second time.

    All of these lessons have defined me. Looking back, I realize that through years of such experiences, I have become a confident, expressive person. Being a 7-footer is both a blessing and a curse, but in the end, accepting who you are is the first step to happiness.

看图解析读图回答：

上图所示疆域是哪个朝代的？

（2）请写出它的疆域四至。

图2也是一种无限分割：在△ABC中，∠C=90°，∠B=30°，过点C作CC₁⊥AB于点C₁，再过点C₁作C₁C₂⊥BC于点C₂，又过点C₂作C₂C₃⊥AB于点C₃，如此无限继续下去，则可将利△ABC分割成△ACC₁、△CC₁C₂、△C₁C₂C₃、△C₂C₃C₄、…、△C_n﹣2C_n﹣1C_n、…．假设AC=2，这些三角形的面积和可以得到一个等式是____．

阅读下面的文言文，完成文后各题。

   李牧者，赵之北边良将也。常居代①雁门，备匈奴，以便宜置吏，市租皆输入莫府②，为士卒费。日击数牛飨士，习射骑，谨烽火，多间谍，厚遇战士。为约曰：“匈奴即入盗，急入收保，有敢捕虏者斩！”匈奴每入，烽火谨，辄入收保，不敢战，如是数岁，亦不亡失，然匈奴以李牧为怯，虽赵边兵亦以为吾将怯。赵王让李牧，李牧如故。赵王怒，召之，使他人代将。

   岁余，匈奴每来，出战。出战，数不利，失亡多，边不得田畜。复请李牧。牧杜门不出，固称疾。赵王乃复强起使将兵。牧曰：“王必用臣，臣如前，乃敢奉令。”王许之。

   李牧至，如故约。匈奴数岁无所得，终以为怯。边士日得赏赐而不用，皆愿一战。于是乃选车得千三百乘，选骑得万三千匹，百金之士五万人，彀者十万人，悉勒***纵畜牧，人民满野。匈奴小入，详北不胜，以数千人委之。单于闻之，大率众来入，李牧多为奇阵，张左右翼击之，大破杀匈奴十余万骑。单于奔走。其后十余岁，匈奴不敢近赵边城。

   赵王迁七年，秦使王翦攻赵，秦多与赵王宠臣郭开金，为反间，言李牧欲反。赵王乃使赵葸及齐将颜聚代李牧。李牧不受命，赵使人微捕得李牧，斩之。后三月，王翦因急击赵，大破杀赵葸。虏赵王迁及其将颜聚，遂灭赵。

（节选自《史记·廉颇蔺相如列传》）

【注】①代：地名。②莫府：“莫”通“幕”；幕府，将帅在外的营帐，即为处理军政事务的衙署。