单项选择题

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
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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