第6题:[不定项选择题]Which of the following 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 本题采用排除法。根据第二段“The opposite of evaporation is Drecipitation…so that thesalinity is decreased.”,“in areas of high rainfall”和“in coastal regions where rivers flow into the ocean”可以排除A、B、D项,答案选C。