题目

The old man lives _________, but he never feels _______. A. alone, lonely B. lonely, alone            C. lonely, lonely          D. alone, alone 答案：A17．下列物质的俗称与化学式对应一致的是（　　）A．纯碱NaOHB．硫黄SO3C．铁红Fe2O3D．苏打NaHCO3