第35题: [单项选择]______is not the cause of the decrease in the oceanic salinity. A. Precipitation B. Rain and snow C. Formation of ice D. Addition of water by rivers 参考答案:C 答案解析:什么因素不使含盐量下降呢 文中第二段末句总结了影响含盐量的因素:蒸发(evaporation)使含盐量增加,降水(precipitation)和河水流入(runoff)使含盐量降低,第四段文中提到结冰