As an old saying goes,"Water is the source of life." Humans can't live without water because water can provide us with many things in our daily lives . For example, we drink it every day. We use it to cook and wash things.We will be in danger if there's no water in the world. But there is only a little water which people can use and it is becoming less and less.So we should try our best to save it. We can save water by fixing a dripping tap.We can also reuse the water after we finish washing.If we do not save water ,the last drop in the world will be human`s tear.
有几句话是从这里复制来的：http://zhidao.baidu.com/question/236946943.html?fr=qrl&cid=197&index=3&fr2=query,但是大部分是我自己写的.望采纳~