单项选择题

A．happened
B．occurring
C．going
D．taken place
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单项选择题
This passage is concerned primarily with the ______.
A．problems of waste disposal
B．dangers of drinking from wells
C．turbidity of polluted water
D．outbreak of cholera
单项选择题
A．playersB．audienceC．coachesD．spectators
A．players
B．audience
C．coaches
D．spectators
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