题目

某同学用下表所示的形式对所学物质进行分类(甲包含乙、丙)。下列分类错误的是 选项ABCD 甲碳单质构成物质微粒有机化合物常见的碱 乙、丙金刚石、C60分子、原子分子、原子烧碱、纯碱 答案：【答案】DWhat do you think _______ in English? [　　] A．difficult to learn B．most difficult to be learned C．it difficult to be learned D．it difficult