单项选择题

The word "they" (Line 5, Par

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