单项选择题

Which of the following best concludes the main topic of this passage

A．The precipitation and evaporation of oceans.
B．The causes of the changes in salinity of ocean water.
C．Different oceans in tropical and coastal regions.
D．The formation and melting of sea ice.
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单项选择题
The Weddell Sea_________.
A．is a good example of increased salinity in freezing sea water
B．is much larger in area than the Arctic oceans
C．has a much lower salinity now than ever
D．has the denser water in its upper parts
单项选择题
According to this passage, the sea_______ is likely to have the lowest salinity.
A．in tropical areas
B．off Antarctica
C．of high rainfall
D．with abundant sunshine
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