题目

U、V、W、X、Y、Z是原子序数依次增大的六种短周期元素。U的单质在W2中燃烧可生成UW和UW2两种气体。X的单质是一种金属，其在W2中燃烧可生成淡黄色固体。Z的单质在W2中燃烧的产物可使品红溶液褪色。Y的单质也是一种金属，该金属在UW2中剧烈燃烧能生成黑、白两种固体。 请回答下列问题：(1)V的单质分子的结构式为___________；YW的电子式为________；X在周期表中的位置为________。(2)U元素形成的同素异形体的晶体类型可能是(填序号)________。①原子晶体  ② 阅读理解 　　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, 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．