实验室里用乙醇和浓硫酸反应生成乙烯，接着再用溴与之反应生成1，2﹣二溴乙烷．在制备过程中由于部分乙醇被浓硫酸氧化还会产生CO₂、SO₂，并进而与Br₂反应生成HBr等酸性气体．

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        【甲】山不在高，有仙则名。水不在深，有龙则灵。斯是陋室，惟吾德馨。苔痕上阶绿，草色入帘青。谈笑有鸿儒，往来无白丁。可以调素琴，阅金经。无丝竹之乱耳，无案牍之劳形。南阳诸葛庐，西蜀子云亭。孔子云：“何陋之有？”
        【乙】项脊轩，旧南阁子也。室仅方丈，可容一人居。百年老屋，尘泥渗（shèn）漉（lù），雨泽下注；每移案，顾视无可置者。又北向，不能得日，日过午已昏。余稍为修葺（qì），使不上漏。前辟四窗，垣墙周庭，以当南日，日影反照，室始洞然。又杂植兰桂竹木于庭，旧时栏楯（shǔn），亦遂增胜。借书满架，偃仰啸歌，冥然兀坐，万籁有声，而庭阶寂寂。小鸟时来啄食，人至不去。三五之夜，明月半墙，桂影斑驳，风移影动，珊珊可爱。

学校中部分学生“不受管”爱和老师对着干，在家里与父母对着干，这种心理属于是（    ）

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    Tom has a strong and faithful dog, Bruce. The dog likes playing with Tom. Sometimes he also follows Tom's father to work.
One morning when Tom's father worked in the field, he took off his coat and put it on the ground under a big tree. He turned to the dog and said,“Watch my coat, Bruce!”
   Bruce sat down on the coat. Later Tom's father remembered he had to buy some food. So he hurried to the shop. After shopping, he went home directly and forgot all about his coat and the dog.
   Late in the evening Tom looked for his dog everywhere in the house, but he couldn't find him. At this time Tom's father suddenly remembered his coat and the dog. He went back to the tree at once. He found that Bruce was still sitting on the coat!