求这篇教案的题目和答案

题目

求这篇教案的题目和答案
【单元导航】
　　The Lancang-Mekong River
　　x05The Lancang-Mekong River is an important international river in Southeast Asia,which flows through six countries.The Lancang River is rich in natural resources and wildlife.The largest part of the basin is a natural conservation area for rare and endangered animals and plants in China.The basin area is still an underdeveloped region at present.However,due to deforestation (滥伐森林) and pollution from industrial,agricultural and domestic sectors,the water quality of the river has been deteriorating (恶化) in recent years.In this paper,the author analyzed the present water quality status of the Lancang River both on the mainstream and its tributaries (支流) based on the data of 1990～1997.The results have shown that the water quality status of the river is not good enough although there are few industrial estates in the region.The pollutants in the river are mainly organic (有机的) materials.The main pollution sources are wastewater fro

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