一个多边形，它的内角和比外角和的4倍多180°，求这个多边形的边数及内角和度数．

    Fei-Fei Li arrived in the U. S. from China at age 16 with many big dreams. And it took many unusual jobs to help her achieve them. Luckily, she was smart and extremely driven. And today, she's the director of Stanford University's artificial intelligence lab.

    As one of the leaders in the world for A. L., I feel much excitement and responsibility to create the most awesome and excellent technology for society and to educate the most awesome and excellent technologists—that's my calling.” Li said.

    She is also a loyal advocate for diversity in the tech industry.

    “I see extremely talented Stanford PhD students struggling with their visas and I find it unthinkable that we create so many barriers for the talents of the world, Li said. While Li was in college at Princeton, she borrowed money from friends and even her high school math teacher to run a dry-cleaning business for her parents in order to help them get by. Li attended classes during the week and worked at the business on the weekends. Then, when Li was in graduate school, her mom developed cancer and had a stroke (中风). It was difficult to keep moving ahead while all of this was happening. The real existential challenge is to live up to your fullest potential, live up to your sense of responsibility and to be honest to yourself about your dreams while doing it, she said.

    Li was named a Great Immigrant of 2016 by the Carnegie Corporation, the nation's oldest grant making foundation which honors roughly 40 naturalized U. S. citizens each year. Her graduate studies were supported by the Paul & Daisy Soros Fellowships for New Americans.

下列物质属于氧化物的是（  ）

“绿色GDP”正成为当前人们热门的话题。所谓“绿色GDP”，是指现行GDP总量扣除环境资源成本和对环境的保护服务费用后剩下的部分，即“绿色GDP”＝GDP总量－（环境资源成本＋环境资源保护服务费用）。据此完成下列各题。