APP Water is essential to living things. For instance, if there is no enough water in a human body, a person may feel uncomfortable or get sick easily. To make matters worse, one may die of thirst. Similarly, plants may wither or die for lack of water. It is apparent that all living things need water to keep alive. Judging from the importance of water, we should know how to conserve wate （共 841 字） [阅读本文] >>
