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精听建议：
先完整地把一条新闻听一到三遍，争取掌握大意。然后，一句一句精听，力争每句话都听明白。遇到实在不懂的地方，再听写。
下面的文本材料中空缺部分里面要填的词都很简单，不过是一些值得注意的连读或者典型的美式发音哦，有些语速比较快。试试看，你能不能全部写对？
（参考文本，欢迎指正^^）
Lesson49 This is the USA
The United States of America — the richest and one of the biggest countries in the world — has several names. People call it "the United states", " 1 ", "America", or just "the USA" or "the US".
There are fifty states in the USA (including Hawaii) with a population of over 2 . There is no "American climate" or "American countryside". Every part of the country is different, from Alaska in the north, covered with 3 , to tropical Florida in the south.
Who are the Americans? Where did they come from? Why did so many people go across the sea to the New World?
The American Indians were the first people to live in this vast land. They had a fascinating ancient culture, and a rich tradition of language and customs. When Christopher Columbus arrived, in 1492, there were probably about 4 Indians in North America. Then, the immigrants came. By the early nineteenth century, the immigrant population was more than 17 million. Most came from Europe, but there were also many from the Middle East and the Far East, as well as millions of Africans, caught in the terrible slave trade.
5 continued. In 1907 alone, one and a quarter million people arrived. By 1914, the population was 92 million. Now there are more than 25 million British Americans (nearly half the population of Britain), about 23 million African Americans, 25 million German Americans and more Irish Americans than the whole population of Ireland.
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