练习十九2

十九：冠词（练习（一）1. In America, ____ car is ____ popular means of transportation（交通设施）.A. the, theB. a, theC. the, /D. the, a2. ---- What happened? ---- They left in such ____ hurry that they forgot to lock ____ door.A. a, aB. a, theC. /, theD. /, a3. There were two small rooms in the house, ____ smaller of which served as ____ kitchen.A. a, theB. the, aC. the, theD. a, a4. I ordered ____ book some time ago. ____ book has arrived.A. a, TheB. the, AC. a, AD. /, The5. Mr Smith is ____ European and his wife is ____ American.A. an, anB. a, aC. a, anD. an, a6. Lesson 10 is ____ most difficult lesson, but it isn’t ____ most difficult lesson in Book One.A. a, aB. a, theC. the, theD. the, a7. My sister works in a factory. She goes home once ____ month. A. a B. an C. the D. every8. He was absent because he had caught ____.A. heavy a coldB. the heavy coldC. a heavy coldD. heavy cold9. ____ water is ____ liquid. A. The, a B. A, a C. /, / D. /, a10. In winter ____ people often hang up wet clothes near ____ fire.A. /, /B. a, aC. /, aD. the, a11. He has tried twice, and the captain asks him to have ____ third try.A. aB. theC. anotherD. other12. He was a top student in the class, he often got ____ in English.A. firstB. a firstC. secondD. the second13. ____ horse is ____ useful animal. A. The, the B. The, a C. The, an D. /, a14. Tom left Shanghai in ____.A. the summer 1995B. summer 1995C. 1995 the summerD. the summer of 199515. ____ children here live ____ most happy life. A. The, the B. The, a C. The, / D. /, the16. The soldier died during ____ World War I. A. the B. the first C. / D. a17. In ____ Marx began to learn Russian.A. a 1870B. 1870sC. the year of 1870D. the 1870s18. Alice is ____ of the two girls. A. taller B. the tall C. more tall D. the taller19. ---- Can your sister play ____? ---- No, but she can play ____.A. the tennis, the pianoB. tennis, pianoC. the tennis, pianoD. tennis, the piano20. The introduction is always in ____ of a book.A. frontB. the frontC. a frontD. instead21. She touched her daughter gently ____ shoulder.A. in herB. on herC. in theD. on the22. Both ____ wounded and ____ sick were sent to safety.A. /, /B. the, theC. /, theD. the, /23. ____ doctors and ____ nurses should care for their patients.A. The, theB. /, /C. The, /D. /, the24. Tell us the story as ____ Mother told you. A. a B. the C. an D. /25. Do you know how long ____ has lived on the earth?A. manB. the manC. a manD. men26. The man was once thrown into ____ prison for robbing the bank. A. a B. an C. theD./27. ____ Mount Tai is in the east of China. A. A B. The C. / D. That28. I like ____ history. I am studying ____ history of China.A. the, /B. /, theC. a, /D. /, a29. He wrote a letter ____ pencil. A. with B. in C. in a D. use a30. On October 1, the Chinese people celebrated ____ with new achievements and victories.A. National DayB. the National DayC. our National DayD. a National Day练习（二）1. ---You mean you know the man? ---I know________ man exactly like him.A. otherB. theC. /D. a2. Wouldn't it be_________ wonderful world if all nations live in ________peace with one another?A. a, /B. the, /C. a, theD. the, the3. ---I hear that as many as 1,500 people were killed in the earthquake.---Yes, ________ news came as ________ shock to us.A. a, aB. the, aC. /, /D. /, a4. At midnight they reached ________ small village ________ east of ______ Everwhite Mountain.A. a,/, theB. a,/, /C. the, the, theD. the, an, an5. Nanjing lies on ________ Changjiang River and has ________ population of more than four million.A. the, theB. the, /C. the, aD. /, a6. Bill Clinton took ________ office on January 20th, 1993 and left ________ office on January 20th, 2001.A. /, /B. his, hisC. the, theD. an, his7. We learn to go all out to work for ____ good of ____ society.A. the, /B. /, /C. /, aD. the, the8. Paris is ____ most beautiful city, where you can see ____ famous Eiffel Tower.A. a, theB. a, /C. the, aD. the, the9. ---What about ____ bike? ---Do you think it all right to buy him ____ bike as ____ birthday present?A. the, the, theB. a, the, aC. the, a, theD. the, the, a10. He had decided to give it up, but on ____ second thoughts he decided to try ____ third time.A. the, aB. /, /C. a, aD. /, a11. Towards ____ morning, ____ heavy rain began to fall.A. the, aB. a, aC. the, /D. the, /12. ---Excuse me, where are ____ books for biology?---Follow me. They' re on this shelf. Do you want ____ new or used book?A. a, aB. a, theC. the, aD. the, the13. Young as he is, David has gained ____ rich experience in ____ society.A. /, /B. the, theC. a, /D./, the14. ---My son is lost. Did you see a boy passing by?---I saw ____ boy hidden behind ____ tree over there. You may go and have a look.A. a, aB. the, theC. a, theD. the, a15. Mary climbed to the top of the mountain in ____ hurry, looked down and found in ____ surprise that ____ whole town took on a new look.A. a, the, theB. a,/,theC. /,/,theD. /,/,a16. In ____ old society many young women died by so curious and cruel ____ custom.A. an, aB. /, theC. the, aD. the, /17. ---You' re sure to help me find ____ bed for my new house?---Sure, but not now. I'm heading for ____ bed and a good sleep.A. a, aB. the, aC. a, /D. the, /18. The wheel is thought to be _____ first invention of _____ transportation.A. the, theB. a, aC. a, /D. the, /19. Some people say that ____ British are _____ funny people.A. the, aB. /, theC. /, /D. the, /20. Don' t worry about _____ mistakes. They' re _____ natural part of learning.A. /, aB. the, /C. /, theD. the, the21. ---Selma looks especially pretty tonight. ---Yes, she always looks her best in _____ of that kind.A. the dressB. a dressC. dressD. the dresses22. --- _____did you think of the exhibition? ---Oh, it was ____ success.A. How, really aB. What, greatC. How, /D. What, quite a23. The child had only _____ slight temperature, but the doctor regarded _____ illness as serious enough for ____ hospital treatment.A. /,/,theB. a,/,/C. a, the,/D. /,the, the24. ---Did you have ____ wonderful time yesterday? ---Yes. I was on _____ top of _____ world.A. /, the, aB. a, /, theC. a, a, theD. a, the, the25. I don' t usually have _____ breakfast, but I always eat _____ good lunch.A. /, /B. /, aC. the, /D. /, the26. ---I hear there'll be ____ talk on English study tomorrow morning.---Do you mean ____ speech our teacher asked us to listen to?A. a, theB. the, aC. the, theD. a, a27. Mr. Stock runs _____ small business, who is in ____ Mexico on business.A. a, aB. /, /C. a, theD. a, /28. Although _____ motor car has been with us for almost a century, I have never been able to drive_____ American one.A. a, theB. a, /C. the, anD. the, the29. Xi'an was _____ starting point of _____ world-famous Silk Road.A. /, /B. a, aC. the, /D. the, the30. ---What does "on _____one hand…on _____other" means?---What_____great fun! You're asking me such a simple question.A. the, the, /B. the, the, aC. /, the, aD. /, the, /31. Alexander Gramha Bell invented ____telephone in 1876. (MET1991)A./;B. aC. theD. one32.After watching ____TV, she played ____violin for an hour.A./;/B. the ; theC. the; /D./;the （MET1991 11）33. ---Where's jack ? ---I think he's still _____in bed, but he might just be in ____bathroom.A./; /B. the; theC. the; /D./; the （MET1992 36）34.Many people are still in ___habit of writing silly things in ___public places.A. the ; theB./; /C. the; /D./; the （MET 1993 19）35.She is ___newcomer to ___chemistry but she has already made some important discoveries.A. the; theB. the ; /C. a; /D. a ; the （NMET1994 20）36.Wouldn't it be ___wonderful world if all nations lived in ___peace with one another?A. a; /B. the; /C. a; theD. the; the （NMET1994 23）37.Many people agree that ___knowledge of English is a must in __international trade today.A. a; /B. the; anC. the; theD./;the （NMET 1996 13）38. Paper money was in ___use in China when Marco Polo visited the country in ___thirteenth century.A. the ; /B. the; theC./; theD./; /（NMET 1999 8）39.It is not true in ___that people in ___fifties are going to university for further education .A.90s; theirB. the 90s; /C.90s; /D. the 90s; their（1999.上海6）40.Most animals have little connection with ____animals of ___different kind unless they killthem for food.A. the; aB./; aC. the ; theD./; the (NMET2000 10)41.---Have you seen ___pen ? I left it here this morning.---Is it ___black one ?I think I saw it somewhere.(NMET1997 7)A. a; theB. the; theC. the ; aD. a; a42.Summers in ___ south of France are for ___most part dry and sunny.A./; aB. the; /C./; /D. the ; the (2000.春招8)43.I don't like talking on ____ telephone; I prefer writing _____letters.(2002春招26)A. a; theB. the ;不填C. the; theD. was killing44.Jumping out of ___airplane at ten thousand feet is quite ____exciting experience.(NMET 2002,26)A./;theB./;anC. an; anD. the; the45. ---I don't like_____New York at all. ---But this isn't_____ New York you remember.A. the, theB. /, theC. the, /D. /, a答案：十九：冠词练习一、1~5 DBBAC 6~10 BACDC 11~15 ABBDB 16~20 CDDDB 21~25 DBBDA26~30 DCBBA练习二、1~5 DABAC 6~10 AAADD 11~15 ACACB 16~20 CCDAA 21~25 BDCBB26~30 ADCDD 31~35 CDDCC 36~40 AACDB 41~45 DDBCB。

平行四边形的高【教学内容】教科书第71页例3，课堂活动2、3题,练习十九2、5、6题。

【教学目标】1．通过观察操作活动，认识平行四边形的高和底。

2．经历画高的全过程，培养学生动手操作能力，增强学生的空间观念。

3．在一系列的数学操作活动中，让学生体会到成功的喜悦，提高学习兴趣。

4．综合应用平行四边形的特征解决简单问题，培养学生的概括能力和逻辑思维能力。

【教学重难点】教学重点：正确画出平行四边形的高。

教学难点：理解平行四边形底和高的意义。

【教学准备】教具：课件，三角板，直尺，学具：钉子板，方格纸，三角板，直尺，直接三角形、平行四边形纸片，剪刀。

【教学过程】一、复习引入1．我们认识的平行四边形有哪些特征？它和长方形、正方形有什么联系？2．在方格纸上画平行四边形。

你是根据什么判断你画的图形一定是平行四边形的？3．学生在本子上“过一点画已知直线的垂线”，并说说垂线的画法。

（指名板演）这节课我们利用画垂线的方法来学习平行四边形的高。

二、探究新知1．教学例3 认识平行四边形的高（1）直观感知（出示活动平行四边形）上节课我们知道了平行四边形有容易变形的特性，拉一拉它的对角，它会变大变小。

你知道它为什么会变大变小吗？（因为平行四边形一会儿变高一会儿变矮。

）这说明平行四边形也是有高矮的。

那么，平行四边形的高在哪儿呢？（2）自主学习四人小组合作：①自学71页例3，勾画重点字句，交流一下你对平行四边形高的理解。

②书上是用什么工具画高的？请你模仿书上的方法，尝试画平行四边形纸片的高，并说说你是怎样画的。

③仔细观察，平行四边形的高和底有什么关系？（3）引导画高指名汇报。

（带上平行四边形纸片和工具，结合画高的过程边比划边说。

）汇报1：过平行四边形的一个顶点，向对边画垂线，这点到垂足的线段是它的高，这条对边是它的底。

我是用三角板画的高。

（师板书：顶点、对边、垂足）汇报2：平行四边形的高和底边互相垂直。

引导小结：平行四边形高的画法和三角形高的画法基本相同，都是先找到一个顶点和它的对边，然后借助三角板，用过直线外一点向已知直线画垂线的方法作高。

二年级上册数学教案第6单元第十课时：练习十九｜人教新课标教学内容：本节课为二年级上册数学第6单元的第十课时，教学内容为练习十九。

练习十九主要涉及两位数的加减法运算，包括进位加法和退位减法。

通过本节课的学习，学生将能够熟练掌握两位数的加减法运算，并能够运用所学知识解决实际问题。

教学目标：1. 知识与技能：使学生能够熟练地进行两位数的加减法运算，包括进位加法和退位减法。

2. 过程与方法：通过练习和实践，提高学生运算的速度和准确性，培养良好的计算习惯。

3. 情感态度价值观：培养学生对数学的兴趣和自信心，培养团队合作意识和积极参与意识。

教学难点：1. 进位加法和退位减法的正确运用。

2. 学生在运算过程中容易出现的错误，如加法进位和减法退位时的混淆。

3. 学生对运算速度和准确性的提高。

教具学具准备：1. 教具：黑板、粉笔、计算器。

2. 学具：练习本、铅笔、橡皮。

教学过程：1. 导入：通过复习上一节课的内容，引导学生回顾两位数的加减法运算规则，为今天的练习做好铺垫。

2. 练习：让学生独立完成练习十九，教师巡回指导，及时纠正学生的错误。

3. 讲解：针对学生在练习中遇到的问题，进行集中讲解和示范，帮助学生理解和掌握正确的运算方法。

4. 小组合作：将学生分成小组，进行小组合作练习，提高运算速度和准确性。

5. 总结：对本节课的学习内容进行总结，强调重点和难点，提醒学生注意运算的细节。

板书设计：1. 板书二年级上册数学教案第6单元第十课时：练习十九2. 板书内容：两位数的加减法运算规则、进位加法和退位减法的运算步骤、常见错误及纠正方法。

作业设计：1. 完成练习十九的剩余题目。

2. 复习本节课所学内容，准备下一节课的测验。

课后反思：本节课通过练习和实践，使学生熟练掌握了两位数的加减法运算，并能够运用所学知识解决实际问题。

在教学过程中，我注重了学生的个别差异，及时纠正了学生的错误，提高了运算速度和准确性。

同时，通过小组合作，培养了学生的团队合作意识和积极参与意识。

“9的乘法口诀二”的教学设计一、设计思想本课的设计意在学生巩固所学知识的基础上，发展学生数学学习的能力，培养学生探究数学与生活的联系。

在情境中体验数学的存在和学习数学的乐趣。

在练习题的教学设计中，利用走数学迷宫这一形式，激发学生学习数学的兴趣和激情，每一环节的安排，每一训练形式与内容的设计都考虑到“蕴涵和拓展”，这样可以将知识点串成线，整和成简单的系列，让知识向横向、纵深方向发展，使学生学得主动而有趣味，切切实实体验数学蕴涵的奥妙，让学生学得真实而有价值，领略数学在生活中的无限魅力二、教材分析三、学情分析四、教学目标（1）知识与技能：熟练掌握9的乘法口诀，并能熟练运用口算计算。

（2）数学思考：让学生通过操作、观察、分析获得知识，进一步体验数学与生活的联系，增强数学意识，发展数学思维。

（3）解决问题：运用数学的思维方式，熟练地解决9的乘法口诀的实际应用。

（4）情感与态度：继续培养学生学习数学的兴趣，让学生在数学学习过程中感受成功带来的喜悦。

五、重点难点教学重点：应用乘法口诀解决一些生活中的实际问题。

教学难点；发现数学中的一些规律。

教学关键：培养学生的创新意识，在参与活动中发展数学思维。

六、教学策略与手段通过闯迷宫这一情境，感受学习数学带来的成功感，从而提升学好数学的信心。

设计了6个闯关游戏，分别是算迷宫长度、算扣子数、跳格子、找规律填数、算船只数、买雪糕，巩固9的乘法口诀，解决实际问题。

七、课前准备1、教师的教学准备：教学挂图第十题的跳格子表格2、学生的学习准备：每人一张跳格子表格八、教学过程（一）创设情境活动导入小朋友们，你们知道迷宫吗？（生回答）是啊，迷宫里面处处是机关，要想走出迷宫得靠智慧和勇气。

我们的小朋友有这样的智慧和勇气吗？想不想去闯闯？带好你的两样宝贝，和老师一起进入数学迷宫吧！（二）过关游戏体验数学1.第一关（算算迷宫的总长）（1）出示例8挂图。

请用数学的眼光仔细观察插图，说说你看到了什么？（2）同桌间轻声讨论，相互说题意。