单项选择题

The major topic discussed in the passage is ______.

A．the subtraction of water
B．the conversion of liquid water to water vapor
C．the salinity of ocean water
D．the effect of precipitation on the salinity of ocean water

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热门试题

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