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pollution. Read para3 and answer: Read and 5 Find the disadvantages of building the dam: cities,counties,towns and villages more than a million people historical relics go under the surface of a river or sea The Three Ges Dam , which is the biggest construction project in China since the building of the Great wall and the Grand Canal(大運河 ), has been built to control flooding and provide hydroelectric power for the central region of China. 三峽大壩是 繼長城和大運河以來 中國最大的建筑工程 , 它的修建 是為了控制洪水泛濫并向華中地區(qū) 提供電力 . Mao Zedong once wrote a poe