单项选择题

The author seems to be wondering ______.

A．what makes up one's adequate working knowledge of English
B．why English can serve so many needs of various people
C．how to relate the technological problems in airport communications
D．when English became so widely used

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单项选择题

Which of the following processes will increase salinity of ocean waters

A．Evaporation.
B．Precipitation.
C．Melting.
D．Dilution.

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