【名师点评】 本文层次清楚，脉络清晰，要点表达完全，逻辑性强且表达方式灵活多样，如，表达“众所周知”时用了非限制性定语从句as we know；而表述现状时，用了“the global water shortage is becoming increasingly severe mainly due to global warming，environmental pollution and the everincreasing population”表达“严重情况”时，用了“it's time we did something about it”，表达“措施”时，用了插入语I think；另外，文中还用了衔接词，如：therefore，firstly，secondly，for example，thirdly，last but not least，in conclusion等，增强了文章的层次感和逻辑性。而且，本文还用了高级词汇，如：everincreasing。这些都用得恰如其分，不仅增添了文章的表现力，而且还让读者读起来朗朗上口，不愧为一篇上乘之作。
