提高聽力同時，你還可以了解到美國歷史上的一些重要事件。請感興趣的你一聽為快吧！
<注意>
hints：國家名大寫
The United States has dramatically changed from its beginnings as 13 little-known colonies. Its population of 300 million people represents almost every national and ethnic group in the world. Progress continues in economics, technology, culture and society. Americans live in an interdependent, interconnected world. The United States still is connected to the values of its early days. Among these are a belief in individual freedom and democratic government and the promise of economic opportunity and progress for all people. The work for the United States is to keep its values of freedom, democracy and opportunity secure and vital in the 21st century.
美國已發(fā)生巨大變化從最初的13個鮮為人知的殖民地。人口300萬人代表幾乎每一個在世界上的民族和族裔群體。在經(jīng)濟，科技，文化，和社會繼續(xù)取得進展。美國人生活在一個相互依存，相互聯(lián)系的世界。美國仍然連接初期的價值。其中有一個信仰在個人自由和民主的政府和經(jīng)濟機會和各國人民的進步的承諾。對美國的工作，要保持其自由，民主和安全的機會和在21世紀(jì)的重要價值觀。