哈鲁咕噜
参见【百度文库】 1 text 1Road BuildingTask 1.1. the relationship between road building and economic development2. grain and cotton3. grew grain grew cotton4. fast and convenient5. to transport grain and cottonTask 1.1. A booming trade in grain and cotton.2. Because of the rapidly growing population and the large number of immigrants from Europe.3. The farmers got laborers from Africa.4. Because it was easy and cheap to transport goods from on place to another.5. They built roads and collected fees.Text 2 The Mississippi River in AmericaTask 11. Lake Itasca in Minnesota2. about 4, 000 kms.3. flooding in summer4. floodways, dams, levees and reservoirs5. holding water and generating electricityTask 2.1. 21 US states.2. It flows from the North to the Gulf of Mexico3. They are empty channels. When the Mississippi is too high, the floodways are opened andsome of the water can flow into the floodways.4. They are earthen walls built alongside a river, holding the water and keeping it fromoverflowing.5. Sine the 20th century.
