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 behin

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The phrase catches on (Line 3, par

A．1) probably means______.A. "becomes perfect"B. "is on sale again"C. "becomes popular"D. "is further modified"

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The word they (Line 5, Par

A．4) refers to______.A. parentsB. schoolsC. activitiesD. students