Water Shortage
提纲
1. 水的重要性。
2. 造成水资源短缺的原因。
3. 怎样缓解缺水问题及保护水资源。
People can＇t imagine life without water. Without it, the earth we live on would be a dead one. There would be no trees, no crops, no animals and no people. So water is considered to be next to oxygen in importance.
Although nearly three quarters of the earth＇s surface is covered
