单项选择题

______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
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单项选择题
It can be known from the passage that increase in the salinity of ocean water is caused by______.
A．melting of sea ice
B．precipitation
C．evaporation
D．supplement of salt
单项选择题
The purpose of mentioning the Weddell Sea is to ______.
A．give an example of cold water salinity
B．point out the location of deep waters
C．compare Antarctic waters with Arctic waters
D．indicate that this body of .water has salinity variations
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