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

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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

单项选择题

The best title of the passage can be ______

A．Typical Oceans and Their Respective Features
B．The Causes of the Changes in Salinity of Ocean Water
C．Different Oceans Have Different Salinity
D．The Precipitation and Evaporation of Oceans