Wealwaysreadreportsaboutcostsofoilgoingupandwewillthi...
问题详情： Wealwaysreadreportsaboutcostsofoilgoingupandwewillthinkthisisourmostvaluablematerial.However,wateristhemostvaluableresource(资源).PeopleintheMiddleEastaremoreworriedaboutthisthanoil.Maybet...