题目

下图有关电化学的示意图正确的是( ) 答案：【解析】 A项，金属性：Sn>Cu，故Sn为负极；B项，电解精炼铜装置中，精铜作阴极，粗铜作阳极；C项，铁片镀锌时，Zn作阳极，Fe作阴极；D项，电解饱和食盐水时，铁棒产生H2，碳棒电极产生Cl2，故正确。 【答案】 D25、Mark was walking home from school one day when he noticed a boy ahead of him．He had tripped （绊倒） and dropped all of the books he was carrying, along with some clothes, a baseball bat and a glove. Mark knelt （跪）down and helped the boy pick up the things．Since they were going the same way, he offered to carry some things for the boy. As they walked, Mark discovered the boy’s name was Bill．He loved video games, baseball and history, but he was having trouble with some of his subjects. They arrived at Bill’s home first．Mark was invited in for a Coke and to watch some television．The afternoon passed pleasantly with some laughs and talk．Then Mark went home. They continued to see each other around school, had lunch together once or twice, and then both graduated from junior school. Three days before graduation, Bill asked Mark if they could talk. Bill reminded （提醒）Mark of the day years ago when they had first met．“Did you ever wonder why I was carrying so many things home that day?” asked Bill. “You see, I took away all my things from school．I had stored away some of my mother’s sleeping pills （安眠药）．I was going home to kill myself．But after we spent some time talking and laughing, I realized that if I had died, I would have missed so many good times．So you see, Mark, when you picked up those books that day, you did a lot more.___________” 1．When Bill fell down on his way home, Mark ________. A．didn’t notice that                            B．went away quickly C．helped him pick up the things                    D．carried all the things for him 2．Which of the following is NOT true? A．Mark was a warm-hearted boy. B．Bill was good at all of his subjects. C．Bill and Mark were in the same school. D．Bill loved video games, baseball and history. 3．At Bill’s home, they didn’t ________. A．drink some Coke                                        B．watch TV C．have a pleasant talk                                     D．play video games 4．Three days before graduation, Bill asked Mark to talk because he ________. A．wanted to tell him his story                         B．wanted to kill himself again     C．hoped to have lunch together                       D．hoped to go on holiday together 5．What would Bill probably say at last? A．I should die.                                               B．You saved my life.     C．You did a good job.                                     D．You helped me a lot. 评卷人 得分 四、阅读填空 （每空？ 分，共？ 分）