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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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.
单项选择题
The word it in the sentence seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. (paragraph 4,line 4) refers to______.
A．seawater
B．surrounding water
C．the salt in the water
D．the water
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