Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
A.identifies | B.purifies | C.classifies | D.clarifies |
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Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
A.identifies | B.purifies | C.classifies | D.clarifies |