要求如下：
1。水对人类的重要性
2。如何节约用水
3。不少于80词的短文

water and life
as human,we should know it is so important that the water for us.about 70% composition of a person's body is water.and we can leave off food to live for long time(at least 7 days) but not more than 72 hours we will die if we leave the water.
the reality now days is the resources of water lacked day by day .this require us must save in useing water.how to do it? in public bathroom,we shouldn't keep the clean water running without stop ,in family,we should save water too,the water after washing fruit and vegetables can used in cleanning floor.and the last time of water by washing face also can be used in wash toilet,and so on.....