A wolf was almost dead with hunger. A house-dog saw him, and asked, "Friend, your irregular life will soon ruin you.
"Why don't you work steadily as I do, and get your food regularly?"
"I would have no objection," said the wolf, "if I could only get a place." "I will help you," said the dog. "Come with me to my master, and you shall share my work."
So the wolf and the dog went to the town together.
On the way the wolf saw that there was no hair around the dog's neck.
He felt quite surprised, and asked him why it was like that?
"Oh, it is nothing," said the dog. "Every night my master puts a collar around my neck and chains me up. You will soon get used to it."
"Is that the only reason?" said the wolf. "Then good-bye to you, my friend. I would rather be free."
三年级英语朗读材料 One Hello, boys and girls. I’m Li Yan. I’m 9 years old. I’m a student. This is my new friend, Ann. She is 10 years old. She is from Canada. She is a good student. Two Hi, I’m Sam. I’m six years old. I’m a pupil. I have a happy family. My father is a teacher. My mother is a teacher, too. My sister is Sarah. She’s a pupil, too. She is ten years old. I love my family. Three My name is Mike. I’m a boy. I’m from Canada. Look! This is my family. This is my father. He is tall and thin. He’s a teacher. This is my mother. She is short and thin. She’s a teacher, too. This is my sister. She’s short and fat. She has big eyes. She’s cute. She’s a pupil. Four ’m Sarah. I’m from the USA. Look! This is my new bag. It’s on my desk. My pencil box is in my bag. My chair is under my desk. Oh, where’s my book? It’s in my bag. Five ’m Tom. I’m from the USA. I’m thirteen years old. I’m a student. I like strawberries. I don’t like oranges. My father is a teacher. He is short and fat. He likes bananas. My mother is thin. She likes watermelons. I have a brother. He has big eyes. He’s cute. He likes pears.
Passage 1 There are some very good things about open education. This way of teaching allows the students to grow as people develop their own interests in many subjects. Open education allows students to be responsible for their own education, as they are responsible for what they do in life. Some students do badly in a traditional classroom. The open classroom may allow them to enjoy learning. Some students will be happier in an open education school. They will not have to worry about grades or rules. For students who worry about these things a lot, it is a good idea to be in an open classroom. But many students will not do well in an open classroom. For some students, there are too few rules. These students will do little in school. They will not make good use of open education. Because open education is so different from traditional education, these students may have a problem getting used to making so many choices. For many students it is important to have some rules in the classroom. They worry about the rules even when there are no rules. Even a few rules will help this kind of student. The last point about open education is that some traditional teachers do not like it. Many teachers do not believe in open education. Teachers who want to have an open classroom may have many problems at their schools. You now know what open education is. Some of its good points and bad points have been explained. You may have your own opinion about open education. The writer thinks that open education is a good idea, but only in theory. In actual fact, it may not work very well in a real class or school. The writer believes that most students, but of course not all students, want some structure in their classes. They want to have rules. In some cases, they must be made to study some subjects. Many students are pleased to find subjects they have to study interesting. They would not study those subjects if they did not have to. 1.Open education allows the students to ____. A.grow as the educated B.be responsible for their future C.develop their own interests D.discover subjects outside class 2. Open education may be a good idea for the students who ____. A.enjoy learning B.worry about grades C.do well in a traditional classroom D.are responsible for what they do in life 3. Some students will do little in an open classroom because ____. A.there are too few rules B.they hate activities C.open education is similar to the traditional education D.they worry about the rules 4. Which of the following is NOT mentioned in the passage?____ A.Some traditional teachers do not like it.
《分析化学》阅读材料03 摘自Analytical Chemistry (FECS) ●In the Br?sted-Lowry theory, an acid is a proton donor and a base is a proton acceptor. Each acid is related to its conjugate base and vice versa: Acid = base + proton Therefore, the conjugate base of a strong acid must be a weak base and the conjugate base of a weak acid must be a strong base. Together they form a couple, and an acid without its conjugate base is a meaningless concept. In order to release a proton, the acid must find a base to accept it. In an aqueous solution, the proton, H+, having an extremely small ionic radius, cannot exist as such. It is hydrated, forming the hydronium ion H3O+ and higher hydrates. Thus, an acid-base equilibrium is not a simple dissociation equilibrium, but the result of a proton transfer reaction in which there are at least two reagents and two products. Such a process is also called protolysis. The overall reaction is expressed by: HX + H2O = H3O+ + X-. The overall equilibrium constant is K = [H3O+][X-]/[HX][H2O]. The acid dissociation constant Ka is given by: Ka = K[H2O] = [H3O+][X-]/[HX]. Ka reflects not only the acid strength of HX, but also the base strength of water. This why different acid dissociation constants are observed for the same acid in different solvent. ●Similar proton transfer reactions exist in all solvents possessing proton donor and acceptor properties. Proton transfer reactions are extremely fast. This makes them very suitable for analytical applications and acid-base reactions have found wide use in volumetric methods and other analytical techniques. ●The pH value is a measure for the acidity or basicity of a solution, aqueous or nonaqueous. ●Acid-base indicators are chemical substances with acid-base properties, having different colors in their protonated and deprotonated forms. ● A most important application of acid-base systems is related to the property of such a system to act as a buffer. Many chemical reactions produce protons (in aqueous solutions hydroniums) or hydroxide ions. If these products remain in the system, a corresponding pH change is observed. However, if a buffer is present in the solution it reacts with the liberated hydrogen or hydroxide ions so that only a relative small change of pH occurs. Buffer consist of a mixture of a weak acid and its conjugate base. The most efficient buffer for a given pH consists of a 1:1 ratio of the protonated and deprotonated forms of a weak acid (with pKa = pH). This cannot always be achieved, but if we wish to prepare a solution of a certain pH, we select a weak acid with a pKa value close to the desired pH. Buffer solution resists changes in pH upon adding of strong acids or strong bases. Depending on the relative concentrations of the acid and base forms of the buffer, the system can resist small or large additions of strong acid or base. This buffer capacity is defined as the number of moles of strong acid of base required to change the pH of 1 L of buffer solution by one pH unit. Solutions with high or low pH values, formed as a result of dissolution of large quantities of a strong base or acid, are characterized by a large buffer capacity, although the electrolyte practically consists of only one of the conjugate forms (e.g., HCl or NaOH solutions). ● A general requirement for all volumetric methods is that the titration process is fast and that it proceeds in a definite stoichiometric ratio, the endpoint of the reaction must by easy to detect and the reaction should be specific and not influenced by other constituents of the solution, i.e., there should be no interference. Question: 1. A H3PO4 solution is brought to pH = 7.00 by the addition of NaOH. Calculate the concentration of the various forms of orthophosphate if the total phosphate concentration in buffer is 0.200 mol /L. pKa1 = 2.16, pKa2 = 7.21, pKa3 = 12.32. 2. A buffer solution is prepared from acid, HA, Ka = 5 10-5, and its salt. The concentration of HA in the buffer is 0.25 mol / L. To 100 mL of the buffer added 5.0 mmol of NaOH, and the pH of the resulting solution is 5.60. What was the pH of the original buffer? 3.It is desired to change the pH of 100 mL of 0.100 mol / L HCl from 1.00 to 4.40 by the addition of sodium acetate, CH3COONa3H2O. How much solid sodium acetate salt must be added in grams? Assume no volume change for the solution as the result of the addition. 4.What is the buffer capacity of a solution which is 0.100 mol / L of NH3 and 0.200 of NH4Cl? 5.Calculate the pH of each of the following solution: (a) Water in equilibrium with CO2 of the air; pKa1 = 6.38, pKa2 = 10.25. (b) Water as in part (a) brought to pH = 7.00 with NaOH and allowed to regain equilibrium with CO2. 6. Derive the following expression for the pH at the first stoichiometric point in the titration of a mixture of two weak acid: HA, the stronger, Ka1, concentration C1; HB, the weaker, Ka2, concentration C2: pH = 1/2 (pKa1 + pKa2) – 1/2 lg (C1/C2)
第六章阅读理解与阅读技能 2009-11-15 23:36:27| 分类：我的世界| 标签：|字号大中小订阅 第六章阅读理解与阅读技能 P249（1）记叙文 Stephen Hawking was born in 1942. He’s a world famous scientist and expert on space and time. Stephen is trying to find the answers to some very big questions, such as: how did the universe being? How will it end? 斯蒂芬在1942年出生。他是研究空间和时间领域的一位举世闻名的科学家和专家。斯蒂芬设法发现一些非常大问题的答案，例如：宇宙未来会怎样？它会怎样结束？ Stephen was a student at Oxford University. He studied math and science. Then, at the age of twenty, he became very ill. He was so young, but the doctor said to his family, “He has only two years to live.” The doctors were wrong-he didn’t die. He can’t walk now but he uses a wheelchair. He talks with the help of a computer. After Oxford, Stephen went to Cambridge University. Three years later, in 1963, he became a doctor of philosophy. 斯蒂芬曾经是牛津大学的学生。他学习数学和科学。然而，在20岁时，他生病了。他是如此年轻，但医生告诉他的家人，“他只活两年。”医生是错误的，他没有死。他现在虽然不能走路，但他可以使用了轮椅。随着计算机的帮助，他可以通过计算机举行会谈。牛津大学毕业后，斯蒂芬前往剑桥大学学习。3 年后，在1963年，他成为哲学博士。 Because of his health problems, it was difficult for him to draw diagrams or to write. So he started to think in pictures. With this new way of thinking, he became one of the most famous scientists in the world. In 1981, he met Pope in Rome. They talked about his ideas. Then, in 1988, he wrote his first important book, A Brief History of Time. It sold more than 5.5 million copies in 33 different countries. 由于他的健康问题，出图或写作对于他是很难的。因此他在图片上开始思考。这种新的思维方式，使他在世界上成为了一位最著名的科学家。在1981年，他在罗马遇见了教皇。他们谈论了他的想法。然后，在1988年他写了他的第一本重要的书，《时间的简史》。它在33个不同国家卖了超过550万本。 （2）说明文 One type of solar collector is not very expensive. It is put on the roof of a building. It is usually put on the sunny side of the roof. The sun is most direct in this side, and the unit will collect more heat. The surface is black because black collects more heat from the sun. Inside, there are pipes with water. The top is a piece of glass. The sun shines through the glass and air inside. It heats the water that is also inside. A pump, a machine to move the water, starts when water is warm enough. Then hot water goes into a storage tank. This tank stores or keeps the hot water. Then there is hot water to use for washing clothes or taking baths and showers.
小学四年级英语阅读材料狗狗的故事【五篇】 导读：本文小学四年级英语阅读材料狗狗的故事【五篇】，仅供参考， 如果觉得很不错，欢迎点评和分享。 a. Hi, I'm Emily. On Saturday, my dog Clifford takes me to visit my Grandma. After lunch, the radio says a big storm is coming. 嗨，我是Emily!星期六，我的狗狗Clifford带我去看望奶奶。午 饭后，收音机说一场大暴风雨即将来临。 b. We have to move to a safer place. 我们不得不搬去一个较安全的地方。 c. Now we are safe. But Clifford knows Grandma is worried about her house. 现在我们安全了。但是Clifford知道奶奶在担心她的房子。 d. He hurries back to Grandma's hous e. The storm is too big. Trees are falling down. But it can't stop him. 他匆忙往奶奶家赶。暴风雨太大，树都倒了，但是这并不能阻止他。 e. Grandma's house is in great danger. Clifford has to do something. 奶奶的房子处在极大的危险中，Clifford必须做点什么。 f. First he picks up some trees.
首先，他捡起一些树。 g. Then he puts the trees behind Grandma's house. He covers them with sand. He builds a sand hill to save Grandma's house. 然后，他把树放在奶奶的房子后面，再用沙把树盖住。他堆起了一座沙山来保住奶奶的房子。 h. The storm stops. Grandma and I go back to the house. We are so happy to be together again. 暴风雨停了。我和奶奶回到了家。我们又在一起了，真高兴啊! 【第二篇：狗狗超极大营救】Clifford to the rescue 大红狗来救援 小学四年级英语阅读材料：狗狗超极大营救 a: Hi, I'm Emily. My dog Clifford likes to eat and to play. And he likes to help. 嗨!我叫Emily。我的狗狗Clifford喜欢吃和玩，他还喜欢帮助人。 b: One day, Clifford and I are walking. A car passes us quickly. 有一天，我和Clifford在散步的时候，一辆汽车从我们身旁飞快驶过。 c: A police car comes right behind it. The police are chasing robbers. 一辆警车紧随其后，警察在追强盗。
最牛英语口语培训模式：躺在家里练口语，全程外教一对一，三个月畅谈无阻！ 洛基英语，免费体验全部在线一对一课程：https://www.doczj.com/doc/5c1121405.html,/wenkxd.htm（报名网址）Passage 14 Attention to detail is something everyone can and should do-especially in a tight job market. Bob Crossley, a human-resources expert notices this in the job applications that come cross his desk every day. “It’s amazing how many candidates eliminate themselves,”he says. “Resumes arrive with stains. Some candidates don’t bother to spell the company’s name correctly. Once I see a mistake, I eliminate the candidate, ”Crossley concludes. If they cannot take of these details. “Why should we trust them with a job?” Can we pay too much attention to detail? Perfectionists struggle over little things at the cost of something larger they work toward. “To keep from losing the forest for the trees,”says Charles Garfield, associate professor at the University of California, San Francisco, “we must constantly ask ourselves how the details we’re working on fit into the larger picture they don’t, we should drop them and move to something else.” Garfield compares this process to his work as a computer scientist at NASA. “The Apollo II moon launch was slightly off-course 90 percent of the time,”says Garfield. “But a successful landing was still likely because we knew the exact coordinates of our goal. This allowed us to landing was still likely because we knew the exact coordinates of our goal. This allowed us to make adjustments as necessary.”Knowing where we want to go helps us judge the importance of every task we undertake. Too often we believe what accounts for other’s success is some special secret or a lucky break. But rarely is success so mysterious. Again and again, we see that by doing little things within our grasp well, large rewards follow. 66. According to the passage, some job applicants were rejected________ A) because of their carelessness as shown in their failure to present a clean copy of a resume B) because of their inadequate education as shown in their poor spelling in writing a resume C) because they failed to give a detailed description of their background in their applications D) because they eliminated their names from the applicants list themselves 67. The word “perfectionists”(Line 1, Para 3)refers to those who________ A) demand others to get everything absolutely right B) know how to adjust their goals according to the circumstances C) pay too much attention to details only to lose their major objectives D) are capable of achieving perfect results in whatever they do 68. Which of the following is the author’s advice to the reader? A) Although too much attention to details may be costly, they should not be overlooked B) Don’t forget details when drawing pictures
计算机专业英语阅读材料 计算机英语（1） Desktop Pattern In the graphical user interface of Microsoft Windows 98,a graphical pattern-called wallpaper-displayed on the desktop (the background "beneath" windows, icons, and dialog boxes). The pattern or picture in the screen background that can be chosen by the user. To change the desktop pattern, choose Display from the Control Panel. 桌面图案 在Microsoft Windows 98的图形用户界面中,一种显示在桌面上称为壁纸(Wallpaper )的图形图案(窗口、图标和对话框后面的背景),屏幕背景可由用户选择图案样式或画面。要改变桌面图案时,从控制面板上选择显示方式。 计算机英语（2） Federated Database In scientific networking ,a collaborative database (part of a collaborator) in which scientists pool their knowledge and discoveries .Federated databases are one proposed solution to the Grand Challenges——problems that are so complex that they far outstrip the capabilities of individual scientists ,or even individual research institutions ,to tackle them independently. 联合式数据库 在科学联网中,科学家们汇集其知识和发现的一种合作数据库(合作的一部分)。联合数据库是对种种重大挑战问题(Grand Challenges)的一种建议性的解决方案——这些问题太复杂,以致于超出单个科学家的能力,甚至单个研究所都无法来单独解决它们。 计算机英语（3） Collapse When creating an outline or viewing a directory tree (such as in the Windows Explorer ),the process of hiding all the outline levels or subdirectories below the selected outline heading or directory. 折叠 当生成一个题纲或观察一个目录树(如在Windows资源管理器中)时,在选定的题纲标题或目录下隐藏所有的题纲层或子目录的过程。 计算机英语（4） Collision In local area networks (LANs) ,a garbled transmission that results when two or more workstations transmit to the same network cable at exactly the same time . Networks have means of preventing collisions. 冲突 在局域网(LANs)中,当两个或多个工作站恰好在同时向同一个网络线路上传送(数据)时产生的错乱传输。网络拥
小学英语阅读理解的常见题型设置及解题技巧 在小学阶段，阅读理解题型灵活多样，但主要有以下题型： 一、读一读，然后选一选。 这种题型的特点是在短文后给出若十个不完整的句子或若干个根据短文内容提出的问题，针对每一题都提供三到四个备选的答案，要求同学们在正确理解短文内容的基础上，从选项中选出一个正确的答案。这类试题的问题一般是紧扣短文内容编排的，既会涉及文章中的细节内容，如文中出现的人物、时间、地点、事件的前因后果等；也会涉及文章中某个词或某个句子的含义以及文章的主旨、大意和标题等。 The big day comes at last! Mrs Jones' third grade students are waiting quietly for her to come into the classroom. Today Amy brings some cakes, Joy brings some napkins, Carlos brings some soda water and Kate brings some cups. Everyone wants the party to he a surprise. Mrs Jones doesn't know the children have known today is her birthday. When she comes into the classroom, the children shout,“Happy birthday, Mrs Jones!”And then the children get a surprise,too. Mrs Jones brings everyone a party hat and an ice cream! 阅读短文，选择最佳答案。 ( ) 1. Mrs Jones' grade students are waiting for her. A. three B.third C.No.3 D.the third ( )2. Carlos brings some _____ ． A. cola B.napkins C.soda water D.cups ( )3．_____ brings some cakes. A. Amy B.Carlos C.Joey D.Kate 分析 题1短文的第二句话告诉我们是琼斯老师的三年级的学生们正静静地等候她的到来。在年级前面应该用序数词来表示，如果是在年级后面就应该用基数词表示。如：the third grade,=Grade Three.同时因为前面有定语Mrs Jones'，所以这里也应该不要the。 题2.3 短文介绍了几个同学分别带了一些东西。卡洛斯带了soda water （汽水），艾米带了蛋糕。 正确答案：1.B 2.C 3. A 二、读一读，然后判断句子正误。 该题型的特点是在短文后给出若干个句子，要求同学们根据短文内容，判断所给的句子意思是否与原文相符。做这类题应该联系短文内容进行发挥，主要是考查对意思相近或相反的几个句子进行鉴别、判断，或是变换词语、句子结构来测试同种意思的不同表达。 There are some public numbers. Do you know when to use these numbers? 110 is a number for calling policeman when you have meet some illegal things. 119 is a number using for a fire accident.
2019-2020年小学四年级英语课外阅读计划 一、指导思想 以《英语课程标准》和新教育理论为行动指南，全面落实市教研室英语课外阅读指导意见，初步构建课外阅读课程，让阅读成为学生日常的生活方式。通过英语课外阅读，不断丰富学生的阅历，开拓学生的文化视野，体验学习英语的乐趣，树立学好英语的自信心，实现学习英语的真正意义和价值，为未来的学习奠定坚实的基础。 二、课外阅读活动的实施 1. 周密计划建立“漂流”机制 英语课外读本作为学校的图书资料，由专人负责，并设立图书漂流记载本。一个月左右漂流一次，每班由两个学生负责班级图书的借阅、登记、回收和保管整理工作。 四年级起以班级为单位进行图书漂流活动，学生人手一册书，以班级为单位进行漂流。从各个年级的1班起漂，向同年级的其他班级漂流。每生每月平均阅读1本书，每天阅读20分钟左右。如：《朗文小学英语分级阅读》每册共4个单元，要求学生每周阅读一个单元。每个年级课外阅读时间最好统一，以便教师辅导与检查，阅读也可以作为家庭作业的一部分。 2. 确保时间提高“阅读”效率 学生每天都要有至少20分钟的阅读时间，每周一个中午按漂流计划进行《牛津故事乐园》或《朗文分级阅读》的教师指导阅读活动，利用家作布置学生自读，每周的英语社团活动进行英语课外阅读的辅导。让学生自由阅读，自由笔记，摘录好词佳句，仿写经典语句等。 3. 授之以渔使学生“会阅读” 教师在对学生进行课外阅读指导时，应讲授阅读方法。（1）阅读与朗读结合。（2）阅读教学与听、说、读、写结合。（3）阅读与工具书使用的结合。 4. 多元评价促进学生发展 对学生阅读的篇目每周进行统计，对中高年级的阅读笔记经常检查。结合平时的展示活动对学生的课外阅读进行多元评价。可以采取师生评价、生生评价、教师评价与家长评价相结合：制作一份阅读评价表——《我的一周阅读记录单》，请家长合作，对学生一周的阅读情况进行周评，对表现