The China National Environmental Monitoring Center ____ air quality in urban areas from levels one to five:

excellent, fairly good, slightly polluted, poor and dangerous. [ ]

A. distributes

B. arranges

C. classifies

D. divides

反映企业营运能力的指标是（）。

A.流动比率

B.资产报酬率

C.存货周转率

D.成本费用利润率