Last summer he taught us _______poisonous gas. A. how did we deal with B. what did we deal with C. how we dealt with D. what we dealt with 答案:C物质氧化性、还原性的强弱,不仅与物质的结构有关,还与物质的浓度和反应温度等有关。下列各组物质: ①Cu与HNO3溶液 ②Cu与FeCl3溶液 ③Zn与H2SO4溶液 ④Fe与HCl溶液由于浓度不同而能发生不同氧化还原反应的是( )A.①③ B.③④ C.①② D.①③④