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

All of the following are processes that decrease salinity EXCEPT______.

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

单项选择题

Which of the following is true

A．The ocean salinity is lower in tropical regions.
B．The ocean salinity is higher in coastal regions where rivers flow into the sea.
C．The ocean salinity is higher in dry regions.
D．The ocean salinity is lower in regions with little precipitation.