Usuallyameteorologicalobservat

更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 829

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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