题目

分类是学习化学常用的方法。下列物质分类不正确的是（） A . 氧化物：冰、干冰 B . 混合物：空气、盐酸 C . 单质：金刚石、液氮 D . 碱：烧碱、纯碱 答案：DWhat a table!I've never seen such a thing before. It is ________ it is long. [     ]A. half not as wide as          B. not half as wide asC.wide not as half as           D. as wide as not half