学术综合英语听力材料
Good morning, everyone. Today I'll 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.
Good morning, everyone. Today I'll 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.