问题标题：
【首字母填空Wateristhe"lifebiood"ofoure___.Itisineverylivingthing.Itrunsthroughmountainsandcalleys.Itformslakesando___.Wecanf___watereverywhere.Rainwaterfindsitswaytorivers.Riversruntoocean.Thereismuchimportant】
问题描述：
首字母填空
Wateristhe"lifebiood"ofoure___.Itisineverylivingthing.Itrunsthroughmountainsandcalleys.Itformslakesando___.Wecanf___watereverywhere.
Rainwaterfindsitswaytorivers.Riversruntoocean.Thereismuchimportantplantandanimallifethere.Butp___candestroysthislife.Wehavetocleanourrivers.
景敏卿回答：
earth-ocean-find-pollution我觉得不对,作为海洋就是ocean,oceansof是很多的意思!所以应是ocean,不是oceans!
包雪松回答：
A____themouthofrivers,freshwaterjointhesaltwateroftheocean.
景敏卿回答：
At
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