单项选择题

The word "they" (Line 5, Par

A．4) refers to______.A. parentsB. schoolsC. activitiesD. students
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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.
单项选择题
All of the following are processes that decrease salinity EXCEPT______.
A．runoff
B．precipitation
C．evaporation
D．melting
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