首字母填空
Wateristhe"lifebiood"ofoure___.Itisineverylivingthing.Itrunsthroughmountainsandcalleys.Itformslakesando___.Wecanf___watereverywhere.
Rainwaterfindsitswaytorivers.Riversruntoocean.Thereismuchimportantplantandanimallifethere.Butp___candestroysthislife.Wehavetocleanourrivers.