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What are the sources of water pollution?The sources of pollution include manufacturing emissions, poorly treated sewage, industrial and agricultural ____.

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What does the sentence "There has been a long-term buildup to this problem."in Para.4 mean?It means that the water problem did not happen ; instead it resulted from our age-old practice of polluting water or wasting water in addition to natural contamination and natural .

What kind of solution to China's water problem does the author suggest?A sustainable, _________ solution.

分页内容显示公式_________________________?

表单中get和post提交方式的区别