根據下面一則廣告詞寫一篇文章說明水的重要性
閱讀電視廣告詞：“if we don’t save water,the last drop of water will be a tear-drop.”根據提示，寫一篇60-80詞的短文。
提示：
1.生活離不開水。
2.可飲用水在減少。
3.水污染嚴重。
4.應保護水源，再利用水。
water is very important to humans.we can’t live without water.the water we can drink is falling.but some people don’t seem to care about it.they waste a lot of water.they pour dirty water into rivers and lakes.water pollution is getting more and more serious.so we must do something to stop the pollution.we not only protect the water but also find ways to reuse it.if we don’t do this,the last drop of water will be a tear-drop.