题目

下列实验操作与预期实验目的或所得实验结论一致的是 选项实验操作实验目的或结论 A将溴乙烷与氢氧化钠溶液共热一段时间，再向冷却后的混合液中滴加硝酸银溶液检验水解产物中的溴离子 B向乙醛溶液中加入新制的银氨溶液，用酒精灯直接加热确定乙醛中是否含有醛基 C向苯和酒精的混合液中加入金属钠确定苯中是否有酒精 DC2H5OH与浓硫酸170℃共热，制得的气体通入酸性KMnO4溶液检验制得气体是否为乙烯 A．A                          此题要求改正所给短文中的错误。短文中有10处错误，每句最多有两处。错误涉及一个单词的增加、删改或修改。增加：在缺词处加一个漏词符号（）,并在此符号下面写出该加的词。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、每处错误及修改均仅限一词。 2、只允许修改10处，多者（从第11处起）不计分。Everyone has many first-time experience and so do I. Now I’d like share with you the first time I had a go at cooking by myself. One Sunday my parents go out. I felt hungry at noon, so I decided to cook for myself. I tried to cook some vegetables, but the pot caught fire where I put some oil into it. Lucky, my mother came back and helped me put off the fire. Although I did not success in my first cooking, but I felt proud of myself. It was the start of try something new. Now I’ve become quite the good cook.