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

These countries in Line 7, Para. 3, most probably refers to _________.

A．the developing countries which used to be colonies
B．the former British colonies which now are developing
C．the colonized countries which become as strong as Britain
D．the developing countries which are still colonized by Britain

单项选择题

Coastal regions are mentioned as cases where _________.

A．sea water is less salty because fresh water joins in
B．rivers carry industrial exhaust into sea
C．sea ice tend to melt more quickly than in the center of oceans
D．heavy water sinks to the deeper portions of the oceans