The government air quality in urban areas from level one to five: excellent, fairly good,slightly polluted, poor and dangerous.
A arranges B. classifies C. distributes D. divides
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解析：考查动词辨析。句意：政府把城市空气质量分为1-5个等级：优、良、轻微污染、差、重污染。A安排；B分类；C分配；D划分；常用divide...into...。故选B。