1-8单元英语听力.doc

Unit 1 Presenting a Speech Road Building Good morning, everyone. Today Ill be talking about the relationship between road building and the development of the American economy during the 18th century. About 300 years ago, the United States economy was growing rapidly, mainly because of a booming trade in two important agricultural products: grain and cotton. Grain output in the eastern part of America increased quickly at that time due to the rapidly growing population and the large number of immigrants from Europe. As a result, the demand for grain almost doubled. For this reason, the trade in grain first developed in this part of the country. At the same time, the road system was gradually built up in order to transport the grain from the rural areas to various cities. The road building clearly helped develop the economy quickly in these areas and in the cities as well. During the same period, farmers in the South could get a large amount of laborers from Africa, and they started to grow cotton. As the cotton output increased, the farmers needed to sell it in other places. As a result, many roads were built to link the rural areas to the cities. At first, this trade of grain and cotton took place along the coast, or near rivers and lakes. It took place there because it was easy and cheap to transport goods from one place to another. Before 1700, it was very expensive to move the goods by road. So, farmers had to rely mainly on rivers to move their crops to markets. At that time, there was only one continuous road that existed in the US. It ran from north to south along country roads, which were linked together to make one long road. Within a short time, the first east-to-west roads were built. They were called turnpikes. Private companies built these roads and collected fees from all vehicles that traveled on them. Eventually, because of the booming trade of grain and cotton, a network of roadways was completed that connected some major cities and towns. Although t