题目

下列化学反应中既不是化合反应也不是分解反应的是 （ ）A.镁 + 氧气氧化镁 B.氢气 + 氯气氯化氢C.碳酸氢铵氨气 + 二氧化碳 + 水 D.锌 + 硫酸硫酸锌 + 氢气 答案：【答案】D【解析】A、该反应符合“多变一”的特点，属于化合反应，不符合题意；B、该反应符合“多变一”的特点，属于化合反应，不符合题意；C、该反应符合“一变多”的特点，属于分解反应，不符合题意；D、该反应的反应物有两种，生成物也有两种，既不是化合反应，也不是分解反应，符合题假定英语课上老师要求同桌之间交换修改作文，请你修改同桌写的写下作文。文中共有10处语言错误，每句中最多有两处错误。每处错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（＼）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1、每处错误及其修改均仅限一词；只允许修改 10处，多者（从第11处起）不计分。Dear Editor,I’m a middle school student naming Li Ming. I’m writing to tell you something. Recently I’ve notiecd many of my classmates often to go to the cyber cafe （网吧） near our school. The other day I went here, too. I was surprised to see many students played computer games, seeing films or chatting. Some students were even talking about love affairs online. On my opinion, cyber cafes should be a place which we can find much useful informations. Internet should be a window to the outside world rather than a place for games. Internet is good if we make good use it. Otherwise, it will do us great harm. So the local government should take measure to make sure that students use cyber cafes positive.