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  1. I think you are talking about the reason why the downstream water is clearer than that of in the upstream in a river. First of all, let's analyse the reason why the upstream water is turbid. → As learn in geography, there are three main...

    分類:科學及數學 > 地理學 2007年06月23日

  2. ...when go to picnic. This may destroy the landscape. The decomposition of th rubbish may even disperse oxygen for trees. 5. Use less timber.

    分類:科學及數學 > 地理學 2007年06月14日

  3. ...: 1* Hong Kong has very little for storing rubbish and other waste, then how come more land for storing waste disposal produced...

    分類:科學及數學 > 地理學 2010年05月08日

  4. ...control methods as for mosquitoes: cutting grass, clearing rubbish and spraying river channels and drains. But both...

    分類:科學及數學 > 地理學 2007年09月30日

  5. ...the hunting habits of creatures and creating excess rubbish in natural habitats. Compared to other countries, ...

    分類:科學及數學 > 地理學 2009年05月17日