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

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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