题目

下列变化的实质相似的是（    ）A.浓H2SO4和浓盐酸在空气中敞口放置时浓度均减小B.SO2和Cl2均能使品红溶液褪色C.浓H2SO4和稀H2SO4与锌反应时均产生气体D.HBr、HI气体均不能用浓H2SO4制取 答案：解析：浓H2SO4的强氧化性能将HBr、HI氧化生成Br2、I2。答案：D________ a man doesn't mean ________ the man. [    ] A. Knowing about, knowing B. Knowing, to know about C. knowing about, to know D. Know about, know