问题
单项选择题
如作下列检查时最可能发现的是
A．直肠指检指套血染
B．肛门口外见有肛裂
C．肛门镜检查见有内痔核
D．钡剂灌肠发现乙状结肠肿瘤
E．肛门外口见明显外痔核
答案
参考答案：C
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如作下列检查时最可能发现的是
A．直肠指检指套血染
B．肛门口外见有肛裂
C．肛门镜检查见有内痔核
D．钡剂灌肠发现乙状结肠肿瘤
E．肛门外口见明显外痔核
参考答案：C
（14分）X、Y、Z、W、Q是原子序数依次增大的短周期主族元素，相关信息如下表：
| 元素 | 相关信息 |
| X | X原子核外最外层电子数是次外层的2倍 |
| Y | Y的气态氢化物的水溶液显弱碱性 |
| Z | Z是地壳中含量最多的金属元素 |
| W | 常温常压下，W的单质是淡黄色固体 |
| Q | …… |
(1)元素Q在元素周期表中的位置______________________________．
(2)Y的最简单气态氢化物甲的水溶液可与H2O2发生反应，其产物不污染环境，化学方程式为______________________________________．（用元素符号表示，下同）
(3)X和氢元素组成的化合物分子有6个原子，其结构式为 ．
(4)已知：X(s)+O2(g) =XO2(g) △H = -393.5ｋJ·mol-1
2X(s)+O2(g) ="2XO(g) " △H = -221.0ｋJ·mol-1
则XO的燃烧热的热化学方程式__________________________________________________.
(5)元素Y与氢元素形成的五核阳离子乙，向含乙和Z的阳离子的混合溶液中加入固体Na2O2，加入Na2O2的物质的量与产生沉淀有如图所示关系：
写出有关反应离子方程式：(每段只用一个离子方程式表示)
o—a段
a—b段 ．
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| Tick, tock, tick, tock. I'm sitting here, watching the movements of my existence pass slowly away. My house has been 1 for such a long time and I'm lonely and forgotten. Sitting here, by myself, all that I can do is 2 and think about my past. I could tell you stories that only 3 would know. But walls can't speak. I came to this place many years ago, along with an old man... 4 , he was with me for only three short years before he passed away.... For a time, I was left alone, while people came and 5 the house.... Then, one day a nice couple moved in with a young son. From the beginning, their son Danny liked to stay with me, and I was completely 6 with him. He always looked as if he loved the stories I told, most of which began with "Back in my day..." and "When I was younger..." I sometimes had the kind of idea that he didn't really understand what I was saying, but it felt good to be 7 .... When Danny went off to college, my heart broke. Soon afterwards, 8 sold the house.... New owners came and 9 . Then, one day it so happened that I was in when a new family was moving into the house. You can't imagine my 10 when, unexpectedly, Danny walked through the front door. He had a 11 and kids now. I was so overjoyed when I saw him that I put all my 12 into my daily activities.... I spent the next twenty years watching his kids grow up, with a mixture of pride and anxiety about what would happen next. The kids finally became 13 and Danny sold the house. That was about five years ago.... Some of the local kids have started the rumor (谣言) that the house is haunted (闹鬼的)-and, in a way, it is. It is haunted by 14 of all the people who have lived in it. Every second has impressed me so much. I have been counting them down and they are almost up for me.... I hope that someday somebody will 15 me, and call on me again. Maybe then I'll get a new home and a chance for a whole new set of memories. | ||||
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