提高听力同时，你还可以了解到美国历史上的一些重要事件。请感兴趣的你一听为快吧！

<注意>国家大写
hints：Alexander Graham Bell;Thomas Edison; George Eastman;
The United States changed after the Civil War. The frontier became less wild. Cities grew in size and number. More factories, steel mills, and railroads were built. Immigrants arrived in the United States with dreams of better lives. This was the age of inventions. Alexander Graham Bell developed the telephone. Thomas Edison invented the light bulb. George Eastman made the moving picture, later called a movie. Before 1860, the government issued 36,000 patents. From 1860 to 1890, the government issued 440,000. Separate companies merged to become larger companies, sometimes called trusts. This happened especially in the steel, rail, oil, and communications industries. With fewer companies, buyers had fewer choices and businesses had more power. An antitrust law was passed in 1890 to stop monopolies, but it was not very effective.
美国在南北战争后改变。边境开发的很少。城市的规模和数量在增长。更多的工厂，钢厂，铁路建成。移民者呆着更好的生活的梦想来到美国。这是发明创造的年代。亚历山大格雷厄姆贝尔发明了电话。托马斯爱迪生发明了灯泡。乔治伊士曼​​发明动人的画面，后来被称为电影。在1860年之前，政府发出36000项专利。从1860年到1890年，政府发出了44万。独立的公司合并成为规模较大的公司，有时也被称为信任。这尤其发生在钢铁，铁路，石油，和通信行业。随着公司越来越少，购房者选择减少和企业有更多的权力。反托拉斯法是在1890年通过为了停止垄断，但它不是很有效。