单项选择题

How is the table salt we use obtained

A．Subtract water from the ocean through evaporation.
B．Add water to the ocean through precipitation.
C．Dissolve materials in the ocean through heating.
D．Convert water vapor into liquid water.

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单项选择题What is the passage mainly about

A．How the precipitation or runoff is actually formed.
B．How the table salt we use is obtained.
C．The processes that cause a change in oceanic salinity.
D．The processes the dissolved materials are left behind.

单项选择题All of the following are processes that decrease salinity EXCEPT______.

A．runoff
B．precipitation
C．evaporation
D．melting