题目

The most important lesson I learned in high school had nothing to do with maths or American history. It came at graduation, several minutes before I left Miramonte High School. I was rather shy back then, content to 41around with my few friends and to concentrate on my 42 I was doing so well that by the end of senior year I had perfect scores and enough 43 to go to college. But my good record soon became a 44 to my well-being. In early June of senior year, the headmaster called me into his office. He asked me to give a leave-taking speech at graduation. I looked at him, my heart美国的邦联制确立了中央集权与地方分权相结合的权力结构。（      ）