学生定从练习 -

小学生数学练习题深入理解乘法运算的意义乘法是小学数学中的重要内容之一，它是数学运算中最基础的运算之一。

在小学生数学的学习中，深入理解乘法运算的意义对于孩子们的数学发展至关重要。

本文将从实际生活中的场景，通过一些有趣的练习题，帮助小学生深入理解乘法运算的意义。

第一节：乘法的基本概念在开始解答乘法运算的练习题之前，我们首先要明确乘法的基本概念。

乘法是将两个或多个数相乘得到一个新的数的运算。

在乘法中，我们通常将被乘数和乘数相乘得到积。

例如，如果有7个苹果，每个苹果的价格是3元，我们可以通过将7个苹果和每个苹果的价格3元相乘得到总价格，即7 × 3 = 21元。

第二节：实际应用场景乘法运算在实际生活中有很多应用场景。

以下是一些常见场景：1.购物计算：当我们在商店购物时，乘法运算可以帮助我们计算总价格。

例如，如果购买2件衣服，每件衣服的价格是50元，我们可以通过将2件衣服和每件衣服的价格50元相乘得到总价格，即2 × 50 = 100元。

2.时间计算：乘法运算可以帮助我们计算时间。

例如，如果我们每天练习数学1小时，一周有7天，我们可以通过将每天练习数学1小时和一周7天相乘得到一周总共练习数学的时间，即1 × 7 = 7小时。

3.面积计算：乘法运算可以帮助我们计算面积。

例如，如果一个正方形的边长是3米，我们可以通过将正方形的边长3米和它自身相乘得到正方形的面积，即3 × 3 = 9平方米。

第三节：乘法的意义乘法运算不仅仅是一种数学运算，它还有着深刻的意义。

以下是乘法运算的几个重要意义：1.倍数概念：乘法运算可以帮助我们理解倍数的概念。

当两个数相乘时，我们将第一个数称为倍数，第二个数称为倍数的倍数。

例如，如果有5个苹果，我们用乘法运算5 × 2，可以得到10个苹果，其中5是倍数，2是倍数的倍数。

2.组合问题：乘法运算可以帮助我们解决组合问题。

例如，我们有3个颜色的帽子和4个颜色的T恤，我们可以通过将3个颜色的帽子和4个颜色的T恤相乘得到可以组合的不同颜色的帽子和T恤的数量，即3 × 4 = 12。

小学生时间练习题一、选择题（每题2分，共20分）1. 一天有多少小时？A. 12小时B. 24小时C. 36小时2. 一小时有多少分钟？A. 30分钟B. 60分钟C. 90分钟3. 一分钟有多少秒？A. 30秒B. 60秒C. 90秒4. 一个星期有几天？A. 5天B. 6天C. 7天5. 一年有多少个月？A. 10个月B. 11个月C. 12个月6. 一年有多少个季度？A. 3个B. 4个C. 5个7. 一个季度有多少个月？A. 2个月B. 3个月C. 4个月8. 一年有多少个季节？A. 3个B. 4个C. 5个9. 一个季节通常有多少个月？A. 2个月B. 3个月C. 4个月10. 一秒钟可以完成哪些事情？A. 写一个字B. 跑100米C. 吃一顿饭二、填空题（每题2分，共20分）11. 从早上8点到中午12点，一共经过了____小时。

12. 如果小明每天睡9个小时，那么他晚上9点睡觉，第二天早上____点起床。

13. 一个学期大约有____个月。

14. 一年中，夏季通常有____个月。

15. 如果今天是星期五，那么3天后是星期____。

16. 小华的生日是2月29日，那么他每____年才过一次生日。

17. 一个钟表的时针走一圈是____小时。

18. 一节标准的小学课堂通常是____分钟。

19. 从1数到60，大约需要____秒。

20. 如果现在是下午3点，那么再过3小时30分是____点。

三、判断题（每题1分，共10分）21. 一天有25个小时。

（）22. 一年有13个月。

（）23. 一年四季中，冬季是最热的季节。

（）24. 一秒钟可以读完一篇短文。

（）25. 一年中，闰年的2月有29天。

（）26. 每个小时都有60分钟。

（）27. 一天中的上午和下午各有12个小时。

（）28. 一周有8天。

（）29. 一年有52周。

（）30. 每个季节都有90天。

（）四、简答题（每题5分，共10分）31. 请列举出一年中的四个季节，并简述每个季节的特点。

二年级体育找规律练习题
题目1：
1. 一组学生排队跑步，第一个学生跑1圈，第二个学生跑2圈，第三个学生跑3圈，以此类推。

请问第五个学生应该跑几圈？
答案1：
第五个学生应该跑5圈。

题目2：
2. 小明每天都会做俯卧撑的训练，他从第一天开始每天增加2
个俯卧撑，第五天他做了多少个俯卧撑？
答案2：
小明第五天做了9个俯卧撑。

题目3：
3. 一组学生进行跳绳比赛，第一个学生跳10下，第二个学生
跳20下，第三个学生跳30下，以此类推。

请问第四个学生应该跳
几下？
答案3：
第四个学生应该跳40下。

题目4：
4. 某人每天一直在做仰卧起坐的练，第一天他做了6个，第二天他做了12个，第三天他做了18个，以此类推。

请问第五天他应该做多少个仰卧起坐？
答案4：
第五天他应该做30个仰卧起坐。

题目5：
5. 一组学生进行短跑比赛，第一个学生跑10米，第二个学生跑15米，第三个学生跑20米，以此类推。

请问第六个学生应该跑多少米？
答案5：
第六个学生应该跑35米。

题目6：
6. 小华每天都在练踢足球，第一天他踢了5次，第二天他踢了10次，第三天他踢了15次，以此类推。

请问第四天他应该踢多少次足球？
答案6：
第四天他应该踢20次足球。

题目7：
7. 一组学生进行投篮练，第一个学生投了3次篮球，第二个学生投了6次篮球，第三个学生投了9次篮球，以此类推。

请问第七个学生应该投多少次篮球？
答案7：
第七个学生应该投21次篮球。

以上是关于二年级体育找规律练习题的答案。

小学生的数学练习题目题目一：加法与减法1. 小明有3个苹果，他吃掉了1个。

请问小明现在还有几个苹果？2. 妈妈给小红买了5本书，她又借了3本书。

请问小红现在一共有几本书？3. 有7颗星星，其中5颗闪烁不定。

请问一共有几颗闪烁的星星？4. 小华有10元钱，他买了一张5元的票和一瓶2元的饮料。

请问小华还有几元钱？5. 小熊在花坛里看到了8只蝴蝶，其中有2只飞走了。

请问小熊还能看到几只蝴蝶？题目二：乘法与除法1. 一盒饼干有4个，小妮一共有3盒。

请问小妮共有几个饼干？2. 小明花了2小时走了8公里的路程。

请问他每小时走几公里？3. 一部手机现在打折，原价是600元，现在降价了30%。

请问手机现在多少钱？4. 麦片一袋有500g，小明每天吃50g的麦片。

请问一袋麦片能够吃几天？5. 一个故事书有120页，小红每天看10页的故事书。

请问小红看完这本书需要多少天？题目三：逻辑推理1. 玫瑰花是什么颜色？选项：红色、蓝色、绿色、黄色2. 猫科动物中，下列哪个动物可以飞？选项：豹子、老虎、小猫、蝙蝠3. 每个星期有几天？选项：3天、6天、7天、8天4. 一元钱可以买一支铅笔，那么十元钱可以买几支铅笔？选项：5支、9支、10支、50支5. 前面三个数字依次为1、3、5，那么接下来的数字是几？选项：6、7、8、9题目四：图形与空间1. 下面哪个图形是一个正方形？选项：□ △ ○ ☆2. 请你用红色画出一个三角形，并用蓝色画出一个正方形。

3. 请写出下列图形的名称：◇◆ ▲ ▼4. 玩具箱里有4个球和3个积木，球比积木多几个？选项：1个、2个、3个、4个5. 若果从A点到B点需要走3步，从B点到C点需要走2步，那么从A点到C点需要走几步？题目五：时间和日期1. 今天是星期一，再过5天是星期几？2. 小明在10点40分起床，在早上刷牙、洗脸、穿衣服等活动共用了20分钟。

请问小明什么时候完成这些活动？3. 妈妈告诉小芳，今天是8月14日，再过20天就是她的生日了。

教学目标：1. 让学生掌握定语从句的基本概念和结构。

2. 培养学生正确使用定语从句的能力，提高英语写作和口语表达能力。

3. 培养学生对英语学习的兴趣，提高英语综合素质。

教学重点：1. 定语从句的概念和结构。

2. 定语从句引导词的选择和使用。

3. 定语从句的语序和时态。

教学难点：1. 定语从句引导词的辨析和选择。

2. 定语从句与主句的语序关系。

3. 定语从句时态的确定。

教学准备：1. 教学课件或黑板。

2. 有关定语从句的练习题。

3. 学生作业或作文。

教学过程：一、导入1. 教师简要介绍定语从句的概念，引导学生思考定语从句在句子中的作用。

2. 通过例句展示定语从句的用法，激发学生的学习兴趣。

二、讲解1. 讲解定语从句的基本概念和结构，包括关系词、先行词和从句。

2. 分析定语从句引导词的选择和使用，如关系代词和关系副词。

3. 强调定语从句的语序和时态，讲解定语从句与主句的语序关系，以及如何确定定语从句的时态。

三、练习1. 教师展示定语从句的练习题，让学生进行口头或书面练习。

2. 教师讲解练习题的正确答案，并对学生的练习情况进行点评。

四、点评1. 教师选取几篇学生的作业或作文，分析其中定语从句的使用情况。

2. 点评学生定语从句的运用是否正确，包括引导词的选择、语序、时态等方面。

3. 对学生的优点给予表扬，对不足之处提出改进建议。

五、总结1. 教师总结本节课的重点内容，强调定语从句的重要性和使用方法。

2. 鼓励学生在日常英语学习中多加练习，提高定语从句的运用能力。

教学反思：1. 本节课是否达到了教学目标，学生对定语从句的掌握程度如何？2. 教学过程中是否充分调动了学生的积极性，是否关注到了学生的个体差异？3. 点评环节是否起到了应有的作用，是否对学生的写作和口语表达产生了积极影响？4. 教学方法是否合适，是否需要调整或改进？课后作业：1. 完成定语从句的专项练习，巩固所学知识。

2. 写一篇短文，运用定语从句描述一个场景或人物。

课堂教学中如何“讲、练”结合多年来对传统的教学方法的观察与实践使我们发现，学生知道面和思维不开阔，学生动手实践能力，探究能力不能得到充分发展，传统教学往往是从课本的定义、公式到习题的训练，新课改要求教学不仅要注重“知识与技能”的培养，还要求关注“过程与方法”“情感、态度、价值观”等方面的发展，学生能力的提高也会在一定程度上会起以作用。

因此，有策略的进行教学，改革课堂教学模式，解决以上两个问题至关重要。

课堂教学中的自学、讲述、练习三步结合教学法就是为了解决以上两个问题所采用的一种方法。

一、引导自主学习教材是教学之本，是学生获取间接知识的来源。

学生学会看书，也就是学到了从书本上获取知识的重要手段。

面对大多数初中生不会看书，所谓看书只不过是走马观花的翻书而已的坏习惯。

为了解决这个问题，引导自学的方法是：教师把当堂要讲的内容以阅读提纲或预习题的方式展示于黑板或幻灯片，与此同时，学生在预习题或提纲的引导下，由前往后系统的详读教材，预习当堂要学习的内容。

教师板书的提纲和学生的预习是同步的。

讨论题等展示于黑板中，并对重、难点问题用彩色笔作出记号，加以突出，以便学生在预习时更加有重点有选择的加深理解和记忆，并提醒学生对有关问题在书中做好记号。

有效发挥了选择性记忆的策略，从而使师生的双边活动都得到有效地发挥。

预习题纲对学生的自学起到抛砖引玉的作用，使学生的自学无目的性为有目的性，变被动为主动。

这不仅从根本上解决了学生不会看书的旧毛病，也可以把不该浪费的时间集中于上课的开始。

并高效的利用这些时间组织学生自学。

使得教师的板书提纲和学生的自学不但互不干扰，而且相辅相成，相得益彰。

教师策略的组织学生利用课堂教学时间进行自学，学生不但觉着有事可做，而且会感到自学有方。

长此以往自然会使学生养成自学的习惯，找到自学的方法。

这不但关系到学生眼前学习成绩能够提高，而且会使其终生受益。

因为教师每堂课都有意识的引导学生自学，有意识的交给他们学习的策略。

1. My father was sure ________ I would overcome my fears.a) that b) what c) as d) which2. The little girl would have fallen into the river but ________ John caught her.a) which b) that c) as d) for3. It happened ________ John wasn’t there that day.a) if b) how c) why d) that4. One of the main reasons men have gone into female-dominated fields is _____ jobs are available in these fields. a) because b) why c) that d) for5. ________ it is expensive or not is the crucial question.a) That b) Whether c) If d) How6. We are considering buying a house in Gainesville, but we want to find out _______________.a) what the taxes are b) what are the taxes c) what taxes are d) how taxes are7. It was not clear ________ the burglar entered the room.a) what b) where c) how d) which8. I know nothing about his journey _______________ he was likely to be away for three months.a) if b) unless c) until d) except that9. _____________ a metal corrodes or not depends on the activity of the metal and ________ tightly the corrosion products stick to the metal.a) If; how b) How; that c) Whether; how d) That; so10. I don’t doubt ________ they will be here.a) that b) whether c) if d) when11. The problem is ________ we can finish the work on time.a) that b) if c) whether d) what12. He usually goes to work on his bike ___________________ it rains.a) except that b) except when c) except d) besides that13. ________________ is the richest man in this town?a) Whom do you think b) Who do you think c) Do you think who d) Who you think14. I doubt __________________.a) if he can come or not b) whether he can come c) while he will be here d) what he will do15. Advertising is distinguished from other forms of communication ________ the advertiser pays for the message to be delivered.a) in that b) which c) whereas d) because16. The people at the party were worried about Janet because no one was aware ____ she had gone.a) where that b) of the place where c) of where d) the place17. “Mary hasn’t written us for such a long time.”“What do you suppose ________ to her?”a) that happens b) happened c) having happened d) to happen18. ________ he treated the Indians tells us something about his personality.a) What b) Which c) That d) How19. I’ll give my books to ________ needs them.a) whomever b) who c) whoever d) whom20. I don’t care _______________ he likes my look.a) that b) why or why not c) whether or not d) if or not21. I’ll see to it ________ everything is ready in time.a) whether b) if c) what d) that22. The experiment makes it evident ________ the whole process can be controlled by a computer.a) why b) whether c) as d) that23. The government has promised to do ________ lies in its power to ease the hardships of the homeless. a) what b) that c) all what d) which24. I prefer his plan to yours, ________ it is more practical and easier to be carried out.a) for which b) except that c) for that d) in that25. The size of the audience, ________ we had expected, was well over five hundred.a) whom b) that c) who d) as26. Respect for the law is the foundation of civilized living; ________ breaks it will be punished.a) whoever b) who c) no matter who d) people who27. The time for the general offensive was approaching. The commander’s order soon came ________ all civilians evacuate (撤离) the village. a) that b) when c) before d) as28. Is it ________ you are born that decides your nationality?a) wherever b) where c) anywhere d) the country29. ______________ made you so angry at the meeting?a) Why was it that b) What did it that c) What was it that d) Why did it that30. Our factory is much more productive now. This year’s production is five times ___ it was ten years ago. a) what b) that c) than d) as31. _____________ the compass was first invented in China.a) It is known that b) All is known that c) As is known that d) What is known that32. ___________________ he had not locked the door before he left.a) That occurred him b) He occurred that c) It occurred to him that d) It was occurred him that33. Do you know ________ the population of the country is?a) how many b) how much c) which d) what34. He asked me _____________ of the suggestion put forward at the meeting.a) what I thought b) what did I think c) how I thought d) who did I think35. ________ is worth doing at all is worth doing well.a) That b) Which c) However d) Whatever36. All the neighbors commented on ________________ for the Smiths to have chosen such an ugly color to paint his house.a) how it was strange b) how strange it was c) how was it strange d) how strange was it37. There isn’t any difference between the two. I really don’t know ______________.a) to choose what b) what to choose c) which to choose from d) which to choose38. _____________________ his offer is up to you to decide.a) We should or should not accept b) Whether we should acceptc) If we should accept d) What we should accept39. The results are quite different from ___________________.a) that we expected b) all which we expected c) what we expected d) those of which we expected40. ____ was the centre of our planetary system was a difficult concept to grasp in the Middle Ages.a) Being the sun and not the earth b) It was the sun and not the earthc) That the sun and not the earth d) The sun and not the earth41. I’ll drive ________ needs a ride.a) who b) whom c) whoever d) whomever42. His promotion was due to ________ he had been working hard.a) that b) what c) the fact which d) the fact that43. It was in China ________ Dr Bethune gave his life to the revolutionary cause.a) that b) where c) when d) how44. We consider _______________ the instrument should be adjusted each time it is used.a) that it necessary b) it necessary that c) necessary that d) necessary of it that45. It was not until she had arrived home ________ remembered her appointment with the doctor.a) when she b) and she c) she d) that she46. Do what you think is right, ________ they say.a) however b) whatever c) whichever d) if only47. It is the third time ________________.a) that I have been here b) since I was here c) since I have been here d) that I was here48. We gave him ________ help we could.a) which b) what c) that d) the49. He couldn’t say what i t was ________ bothered him.a) what b) who c) that d) how50. It is several years ________ I left my hometown.a) since b) that c) when d) until。

2023-2024 学年高中语法专项练习单选100题-名词性从句1. I wonder how many years ago ______.（）A. did your father retireB. your father retiredC. has your father retiredD. your father has retired2. My grandmother helped me believe that I could accomplish ______ I put my mind to.A. wheneverB. whateverC. whereverD. whichever3. The worsening living conditions on the Carteret Islands finally resulted in________we called the relocation of all the islanders, from________arose the problem of losing their traditions and celebrations.A. which; whatB. which; whichC. what; thatD. what; which4. —Sandy, dragon Boat festival has passed. Could you tell me________?—Sure! I bought some in Wonderful Supermarket. It’s not far from here.A. where you bought so sweet ZongziB. who likes eating sweet ZongziC. whether the Zongzi was sweetD. how did you make sweet Zongzi5. Bear in mind ________ there is a will there is a way，so it is never too late to start so long as you are ________ ready to give yourself an opportunity.（）A. that；soB. where；tooC. that where；tooD. that if；so6. Leaders often have multiple agendas that______.For example，they need to consider ___________a particular speech is intended to persuade uncommitted voters or attract favorable media coverage.（）A. beg the question；whetherB. are worth the effort；howC. pull in different directions；whetherD. go to great lengths；how7. _____ an arrangement to put off the house project in the village，we moved to discuss ______ we should carry out the farming modernization there.（）A. Made；thatB. Making；whatC. Having made；whenD. Made；where8. Is there a magic wand that silently transforms you and those special people on journey into ________ sometimes can be a lifelong relationship？（）A. itB. thatC. whatD. which9. T，slow down and think_________you really want to do at that moment.（）A. howB. whetherC. whatD. that10. We must be in a place of peace and faith，so internal conflict and disbelief do not hold back ________ it is possible for us to achieve.（）A. howB. whatC. whyD. where11. When I saw my cat waiting sadly for the dog to return at the gate，I suddenly realized ________ close the relationship between them was.（）A. thatB. whatC. howD. whether12. Under______I call the " constant companion model，" we now see our smartphones as always-on portals （通道）to information.（）A. thatB. whichC. whatD. who13. The department manager promised told her who stole the necklace would be rewarded. To her surprise, she said, there was no response.（）A. whoever； whicheverB. whoever； no matter whatC. no matter who； whateverD. no matter who； no matter what14. I was surprised by her words, which made me recognize ______ silly mistakes I had made.A. whatB. thatC. howD. which15. But this is the first time that I ______ an application and the personal resume, so I don’t know ______ there is something to pay attention to.A. had written; whetherB. wrote; whatC. have been written; whyD. have written; if16. When I succeeded in becoming an employee of IBM China, many friends asked me _______ I survived the interview.A. howB. thatC. whenD. why17. There are times when your heart is not in your work. This can affect your work. So, slow down and think _________you really want to do at that moment.A. howB. whetherC. whatD. that18. The employers often give the job to______they believe has work experience with strong sense of duty.（）A. whoeverB. whoC. those whoD. whomever19. I hope to set up our company in _______ will be a promising land, a place _______ is full of opportunities.A. where, whereB. where, thatC. what, whereD. what, that20. As many as five courses are provided，and you are free to choose ______ suits you best.A. whateverB. whicheverC. wheneverD. wherever21. We took it for granted ______ they would accept the proposal, so we think it no use ______ them eagerly.A. if; convincingB. that; to convinceC. that; convincingD. if; to convince22. ——Excuse me, would you please tell me if the sports meeting_____on time?——If it_______tomorrow, we will have to put it off.A. will hold; snowsB. will be held; snowsC. will be held; snowD. holds; will snow23. -- Do you know if he to play basketball with us？--- I think he will come if he free tomorrow．（）A. comes，isB. comes，will beC. will come，isD. will come，will be24. Excuse me, could you tell me _______？A. how long will the film beginB. how long the film will beginC. how soon the film will beginD. how soon will the film begin25. Although the theory has been dismissed by scholars，it shows ______ powerful the secrets of Ancient Maya civilization are among people.（）A. thatB. howC. whatD. whether26. In ________ meet two rivers lies my hometown.A. whereB. whatC. thatD. which27. I really donˈt know ________ I had this photo taken.A. where it was thatB. it was thatC. where it wasD. it was why28. These days，teachers have been sparing no efforts to create they hope will be the best means to improve the efficiency of online teaching，some students don't notice or care about，though.（）A. that，which B. what，which C. which，what D. what，that29. The new school has been set up in was a church three years ago.（）A. whereB. whichC. whatD. the place30. The most widely accepted theory about _________ the Middle East has large oil reserves is that the region was not always a vast desert.（）A. whichB. thatC. whyD. whether31. _____ she became an artist ten years ago may have been due to her father's influence.（）A. WhatB. IfC. ThatD. When32. _______ he can work out the challenging math problem remains to be seen.A. WhetherB. ThatC. WhichD. Why33. _____ wins the first place in the bicycle race will be awarded the gold medal.（）A. WhoeverB. WhoC. WhomeverD. Whom34. It is ________ he often feels sleepy in class ________ makes his teachers worried about him.（）A. what；thatB. that；whatC. that；thatD. /；that35. _______ remains important is that we have an incredible desire to think and create, and thatˈs the real spirit of invention.A. ItB. ThatC. WhatD. As36. _______ I am not satisfied with is _________ they have made too many mistakes.A. What; thatB. That; whatC. What ; whatD. That ; that37. ____ remains important is ____ we have an incredible desire to think and create and that's the real spirit of invention.（）A. What；thatB. What；whatC. It；thatD. That；that38. ______the people in the Middle Ages knew of the universe was twisted by the Church.（）A. What littleB. What a littleC. LittleD. A little39. _______leaves the classroom last should turn off the lights.A. WhichB. WhoC. WhicheverD. Whoever40. _______ life exists on any other planet in the solar system still remains a question.A. WhyB. WhetherC. HowD. If41. It is said________ __________was all _______ he said.A. that; that; whichB. what; what; whatC. that; which; whatD. that; that; that42. ____ is known to us all is that China is a developing country______the Third World.（）A. As； belong toB. It； belongs toC. What； belonging toD. That； belonging to43. It was a pure coincidence_________Julia and I toured the University of Oxford on the same day.A. thatB. howC. whatD. which44. _____ is a good meal and a good rest.（）A. That you really needB. That you really needC. What you really needD. What are you really needed45.the doctors really doubt is my mother will recover from the serious disease soon.A. What; whenB. That; howC. What; whetherD. That; what46.We have learned from the story that _____ is most valuable is not _____ we have in our lives but_____ we h ave in our lives.A. what; that; thatB. What; what; whatC. What; that; whatD. What; what; who47. It doesn't matter ______you turn right or left at the crossing-both roads lead to the park.（）A. ifB. howC. whetherD. when48. _______ breaks the law should be punished.（）A. WhoeverB. No matter whoC. WhomeverD. No matter whom49. It is not a problem ______ we can win the battle; it's just a matter of time.A. whetherB. whyC. whenD. where50. _____ female college graduates get a job appears to be rather difficult nowadays in China.（）A. ThatB. WhyC. WhatD. Whether51. _________you must be informed of before setting out to finish the paper is__________ it is a student-made one.（）A. What；/B. That；thatC. What；thatD. That；/52. —Mum，I don't think I am qualified enough to do this.—Honey，be confident!You should know it is ______a man thinks of himself______ really determines his fate.（）A. that；thatB. how；thatC. what；thatD. how；how53. Actually，girls can be________they want to be just like boys，whether it is a soldier，a scientist，or an official.（）A. no matter whatB. howeverC. whateverD. whoever54. It is generally believed that communication skills are becoming ________ it takes to be a good doctor.A. thatB. whatC. whetherD. how55. Part of the reason Charles Dickens loved his own novel, David Copperfield, was ______ it was rather closely modeled on his own life.A. whatB. thatC. whyD. whether56. ____ girls can be_____they would like to be, whether it is a pilot or an astronaut, is being accepted all around the world.A. What; whomeverB. That; whateverC. If; whoeverD. 不填; whatever57. Ensuring every child equal rights to education is _____the key to the elimination of inequality across the world lies.A. thatB. whatC. whetherD. where58. The reason ________ he explained was________ he was ill and unable to go to school.A. why; thatB. why; becauseC. which; becauseD. which; that59. The reason ______ he was late for class is ______ he didn't catch the first bus.（）A. why；becauseB. why；thatC. that；becauseD. which；that60. The question is ______ we will have our sports meet next week.A. thatB. ifC. whenD. whether61. What I want to know is ________ I can do to help you with your English.A. thatB. whichC. whatD. whether62. —What a mess! You are always so lazy!—I'm not to blame, mum. I am ______ you have made me.A. howB. whatC. thatD. who63. Another factor open to question is ______ the new cases in the city might lead to another downturn, ultimately ______ for a rather slowed recovery.A. that…madeB. that…makingC. whether…madeD. whether…making64. You are gaining weight recently. It is ______ you eat too much and haven't enough time to do exercise.A. becauseB. whyC. the reasonD. what65. The beauty of a tournament like the World Cup is_______it can be wildly unpredictable．（）A. whetherB. howC. thatD. why66. We are afraid of making mistakes when learning a foreign language，and that is ________ we are quiet in our English classes（）A. whatB. becauseC. whetherD. why67. The first time I wandered into my college library was__________I was in Fresher's Week.（）A. whenB. thatC. whereD. as68. The main reason___________monarch butterflies are endangered is___________lots of places___________used to be home to them have been seriously destroyed.（）A. why；because；whereB. that；because；whereC. why；that；thatD. why；that；where69. One reason for her preference for this school is______，as she put it，it can provide for her future development.（）A. whichB. whatC. thatD. this70. —These days I feel exhausted and lack strength.—That's _____too much drinking and poor diet lead.（）A. whatB. whichC. to whichD. where71. All the people have incredible ideas to share，but what matters is _________we're able to carry them out.（）A. whichB. asC. whetherD. what72. The reason I gave up is I could not see the place I was going to reach.（）A. that；becauseB. why；thatC. why；becauseD. that；that73. Respect is not one-way traffic but mutual, and that might be ______ we fight back in the trade friction against the USA.A. whereB. becauseC. whyD. how74. The reason ______ he was sleepy in class was ______ he stayed up last night.A. that; thatB. that; whyC. why; becauseD. why; that75. What the doctors really doubt is______ the patient will recover from the serious disease soon.（）A. wheneverB. ifC. whetherD. that76. —I prefer shutting myself in and listening to music all day on Sundays.—That's ______ I don't agree. You should have a more active life.A. whereB. howC. whenD. what77. —Is it true that Mike refused an offer from Yale University yesterday?—Yeah, but I have no idea ______ he did it; that's one of his favorite universities.A. whenB. whyC. thatD. how78. There is much chance ______ Bill will recover from his injury in time for the race.A. whichB. thatC. untilD. if79. There is no doubt ________ Dream of Red Mansions A warm thought suddenly came to me ______ I might use the pocket money to buy some flowers for my mother's birthday.A. whatB. whichC. thatD. whether81. It is still a question ______ we shall have our sports meet.A. whyB. thatC. whenD. which82. Although the hotel building was still in good shape after the earthquake, he had no idea ________ the business could restart.A. thatB. whyC. whenD. what83. With your help, there is no doubt ______ our plan is meant for will work out successfully.A. what thatB. whether thatC. that whatD. that whether84. We have some doubt ______ they can complete the task on time.（）A. whichB. whatC. whetherD. if85. Professor Smith insists on the truth___________it is only by studying bones of ancient people___________we can reveal the mystery.（）A. that；thenB. /；thatC. that；thatD. that；when86. The question ______ will win the NBA MVP this year is ______ every basketball fan cares about.A. that; whatB. who; thatC. who; whatD. that; that87. The decision will be made at the meeting to be held around two in the afternoon ______ the sports meeting will be put off．（）A. whenB. whichC. whetherD. that88.Father made a promise______________ I did well in the entrance exam， he would take me to Hong Kong in the summer vacation．（）A. if thatB. ifC. that ifD. that89. I heard the news on the radio last night there was a terrible storm on the way．（）A. thatB. whichC. howD. where90. Legend has it _________monsters live the Kanas Lake's depth and they often drag drinking horses and camels into the water before swallowing them.（）A. thatB. whatC. whenD. as91. There is no doubt ______ he is a good athlete, but I doubt ______ he will win as he is injured.A. which; ifB. which; thatC. that; ifD. that; that92. They received orders ______ the work ______ right away.A. which; must be doneB. that; must be doneC. what; should doD. that; be done93. It was at the beginning ______ he made the decision ______ we should send more firefighters there.A. that; thatB. when; whichC. there; whatD. where; what94. There is much truth in the idea kindness is usually served by frankness．（）A. whyB. whichC. thatD. whether95. No one was convinced by her insistence___________ to blame.（）A. that she be notB. that she was notC. on her being notD. on her not be96. Wh en we start gazing into the night sky with a telescope, soon weˈll be astonished by the realization ________ we and our world are part of this giant system.A. thatB. whyC. asD. whether97. Y ou havenˈt yet answered my question______I can join the club or not.A. ifB. whetherC. thatD. which98. The reason ________ he has been a success is ________ he never gives up.A. for which; whichB. why; thatC. why; whichD. for which; which99. Decorating the Christmas tree took us more than an hour just because the decorations were not exactly _________we remembered putting them.（）A. whereB. whatC. thatD. whether100. Can you guess__________ Wendy agrees with May or not？（）A. ifB. whetherC. weatherD. that。

小学生数学用线段解题练习题# 小学生数学用线段解题练习题## 一、基础线段问题1. 题目一：画一条线段AB，如果线段AB的长度是8厘米，那么线段AB的中点C到A点的距离是多少厘米？2. 题目二：已知线段CD的长度是10厘米，如果点E是线段CD的中点，求线段CE的长度。

3. 题目三：线段EF被点G平分，EF的长度是12厘米，求GF的长度。

4. 题目四：线段HI的长度是15厘米，如果点J是线段HI的三等分点，求HJ和IJ的长度。

5. 题目五：线段KL的长度是20厘米，如果点M和N分别是线段KL的四等分点，求MN的长度。

## 二、线段的和与差6. 题目六：线段MN的长度是6厘米，线段OP的长度是4厘米，求线段MN和OP的和。

7. 题目七：如果线段PQ的长度是9厘米，线段RS的长度是3厘米，求线段PQ比RS长多少厘米。

8. 题目八：线段TU的长度是14厘米，如果从TU上减去线段VW的长度，VW的长度是5厘米，求剩余的长度。

9. 题目九：线段XY的长度是18厘米，线段YZ的长度是12厘米，求线段XY比YZ长多少厘米。

10. 题目十：线段AB的长度是11厘米，线段CD的长度是7厘米，求线段AB比CD长多少厘米。

## 三、线段的倍数关系11. 题目十一：线段EF的长度是2厘米，如果线段GH是EF的3倍，求GH的长度。

12. 题目十二：线段IJ的长度是5厘米，如果线段KL是IJ的一半，求KL的长度。

13. 题目十三：线段MN的长度是8厘米，如果线段OP是MN的1.5倍，求OP的长度。

14. 题目十四：线段PQ的长度是10厘米，如果线段RS是PQ的四分之一，求RS的长度。

15. 题目十五：线段TU的长度是6厘米，如果线段VW是TU的两倍，求VW的长度。

## 四、线段的组合问题16. 题目十六：线段XY的长度是7厘米，线段YZ的长度是3厘米，如果线段XZ是XY和YZ的和，求XZ的长度。

17. 题目十七：线段AB的长度是9厘米，线段BC的长度是6厘米，如果线段AC是AB和BC的差，求AC的长度。

初三学生的学习方法和技巧有哪些在初三来临之际，为了赶上其他同学的步伐，掌握一个好的学习方法就变得尤为重要。

下面是小编分享的初三学生的学习方法，一起来看看吧。

初三学生的学习方法1、制定合理的学习计划目标：帮助孩子设定一个目标，并为他制定一个学习计划。

目标要切实可行，既不能高不可攀，也不要毫无吸引力。

学习计划要和孩子一起制定，得到孩子的认同才会更容易执行。

督促孩子执行学习计划，每一天都不放松。

在计划的执行过程中，及时发现孩子的进步，给予表扬，使其体验到成功的喜悦。

在孩子遇到困难时，鼓励他去战胜困难，必要时给予孩子适当帮助。

2、必要的课前预习：中国有句古话：“凡事预则立，不预则废”。

这句话强调不管做什么事，要事先有充分的准备。

学生学习课程知识，课前的预习，既是心理准备，也是具体内容的准备。

课前预习的基本要求是：认真阅读教材，了解教材内容，思考内容重点，找出学习难点，做好听讲准备。

3、听好40分钟的课：在学习过程中，会听讲是最重要的。

孩子有了预习的基础，在心理上就会有想听听教师怎么讲、跟自己的理解一样不一样的愿望。

教师讲课，比孩子预习的要深入，要告诉孩子上课跟着教师的教学走，眼睛看、耳朵听、心里想，需要做练习时马上动手，要明确地记住重点和难点，基础知识、定义、定理要进行强化记忆，要掌握例题的解答步骤、方法，如遇卡壳的地方，要反复思考弄懂。

4、提高作业质量认真对待默写和背书：做作业的要求是看清题，抄准题，理清思路，一次做对，认真检查。

家长应教育孩子，做作业是运用所学知识解决问题、提高学习技能的过程，必须踏踏实实，一步一个印。

做作业时要在旁边预备草稿本或草稿纸，作业本上尽量减少或没有涂改的痕迹。

作业要自己检查，不能依赖家长，家长也不要越俎代庖。

5、及时纠正错题总结提高：孩子做错题是经常发生的事，从纠正错误入手也是辅导孩子的好方式。

给孩子一个专用的本子，孩子每次作业或考试出现错误，就让孩子在专用的本子上将题目抄下，然后按正确的方法重做一遍，之后分析错误原因，用红笔将错误的内容标出。

定语从句【概念】定语从句,也称为关系从句或形容词性从句,由关系代词或关系副词引导,用来限制,描绘或说明主句中的某一个名词或代词(有时也可以说明整个主句或主句中的一部分),即句子作定语.定语从句所修饰的对象被称为先行词.定语从句按其作用可分为限制性定语从句和非限制性定语从句.关系代词和关系副词的作用有:①连接作用:引导从句并同时连接主句和从句②替代作用:在从句中替代它前面的先行词③作成分:在从句中充当句子成分.如:主语(who,that,which);宾语(who,whom,which,that);表语(that,as);定语(whose,...of whom/which);时间状语(when),地点状语(where)和原因状语(why).说明:关系代词在从句中宾语时可省略,作其他成分时一般不可省略.(一)关系代词的用法⑴限制性定语从句中,必须用关系代词that的情况:①当先行词是不定代词all,much,little,something,everything,anything,nothing,none等时.Do you have anything that you want to say for yourself?You should hand in all that you have.②当先行词被the only,the very,any,few,little,no,all等词修饰时.This is the very person that I'm waiting for.The only thing that we can do is to give you some advice.③当先行词是形容词最高级或先行词的前面有形容词最高级修饰时.This is the best way that has been used against pollution.This is the most interesting film that I've ever seen.④当先行词是序数词或它前面有序数词修饰时.This train is the last that will go to Suzhou.What is the first American film that you have seen?⑤当先行词既有人又有物时.Do you know the things and persons that they are talking about?⑵当先行词指物时,定语从句中关系代词必须用which的情况:①在非限制性定语从句中,只用which,不用that.Helen was much kinder to her youngest son than to the others,which,of course,made the others envy him.②当定语从句中的介词提前时,只用which,不用that.This is the school in which I once studied.3.关系代词who/that,whom和whose的用法.当先行词指人: ①在定语从句中作主语时,用who/that,不可省略②在定语从句中作宾语时,用whom/who/that,可以省略③在定语从句中作定语时,用whose,不可省略She is the girl who/that lives next door.(先行词在定语从句中作主语)That's the girl(whom/who/that)I teach.(先行词在定语从句中作宾语)This is the scientist whose achievements are well known.(先行词在定语从句中作定语)This is the house whose window broke last night.=This is the house,the window of which broke last night.=This is the house,of which the window broke last night.4."介词+关系代词"引导的定语从句⑴当介词放在关系代词的前面时,关系代词常用which或whom,关系代词不能省略.Is this the house in which Shakespeare was born?He paid the boy ＄10 for washing ten windows,most of which hadn't been cleaned for at least a year.In the dark street,there wasn't a single person to whom she could turn for help.⑵在限制性定语从句中,当介词位于定语从句的末尾时,可用that/which(指物),that/whom/who(指人)作介词的宾语,而且作介词宾语的关系代词可以省略.thatThis is the hero who we are proud of.whom(可省略)thatThis is the pen which I wrote the letter with.(可省略)⑶"介词+which/whom+不定式"结构The beggar has no money with which to buy food.=The beggar has no money to buy food with.=The beggar has no money that he can buy food with.5.关系代词as引导的定语从句关系代词as既可以引导限制性定语从句,也可以引导非限制性定语从句,as在从句中作主语,宾语或表语.as引导限制性定语从句时常用于下列句式:such+名词+as...像....一样的,像....之类的⑴the same+名词+as...和....一样的其中关系代词as在从句中担当主语,宾语或表语.We have found such materials as are used in their factory.(as作主语)These houses were sold at such a low price as people expected.(as作宾语)He is not the same man as he was.(as作表语)⑵...such as..such为代词,意为"这样的人或物",as引导定语从句并在从句中担当成分,定语从句修饰先行词such.This book is not such as I expect.(as作宾语)6.关系代词as与which引导非限制性定语从句时的区别as引导的非限制性定语从句,既可在主句前,又可在主句后,有时还可插入主句中,而which引导的非限制性定语从句只能置于主句之后.相同的是两者都可替代整个主句的内容.The weather turned out to be very good,which was more than we could expert.As is known to everybody,the moon travels round the earth once every month.=The moon travels round the earth once every month,as/which is known to everybody.(二)关系副词的用法1.当关系词在定语从句中作状语时,要用关系副词.其中when=表时间的介词(in,at,on,during)+which;where=表地点的介词(in,at,on,under)+which;why=表原因的介词(for)+which.I still remember the day when I first came to Beijing.(when=on which)Can you tell me the office where he works?(where=in which)Do you know the reason why he is absent?(why=for which)2.有时先行词为抽象名词situation,stage,point等,表示模糊化的地点,可用where引导定语从句. The accident has reached a point where both their parents are to be called in.(三)定语从句用法的其他要点1.定语从句中的谓语动词与先行词保持一致当引导定语从句的关系代词在从句中作主语时,定语从句中的谓语动词在人称,数方面应该与先行词保持一致.⑴one of+复数名词+关系代词+动词复数形式.Titanic is one of the most wonderful movies that have been produced in Hollywood.⑵the only one of+复数名词+关系代词+动词单数形式Titanic is the only one of these wonderful movies that has been produced in Hollywood.⑶当关系代词as与which引导非限制性定语从句,修饰主句内容时,若as与which作主语,则从句的谓语动词用单数形式.Great changes have taken place in China,as is known to all.⑴当先行词是way(意为"方式,方法"),定语从句中缺宾语时,引导定语从句的关系词有下列三种形式:thatThe way which he explained to us was quite simple.不填而当定语从句中缺状语时,引导定语从句的关系词有以下三种形式:thatThe way in which he explained the sentence to us was not difficult to understand.不填③He wrote a letter he explained what had happened in the accident.④A lot of language learning, has been discovered,is happening in the first year of life,so parents should talk much to their children during that period.⑤The prize will go to the writer story shows the most imagination.【练习】1.Creating an atmosphere employees feel part of a team is a big challenge.2.The number of smokers, is reported,has dropped by 17 percent in just one year.4.Some experts think reading is the fundamental skill upon school education depends.5.China Today attracts a worldwide readership, shows that more and more people all over the world want to learn about China.6.It is a truly delightful place, looks the same as it must have done 100 years ago with its winding streets and pretty cottages.8.The books on the desk, covers are shiny,are prizes for us.9.Opposite is St.Paul's Church, you can hear some lovely music.12.We'll reach the sales targets in a month we set at the beginning of the year.14.English is a language shared by several diverse cultures,each of uses it differently.16.The exact year Angel and her family spent together in China was 2008.17.I am looking forward to the day my daughter can read this book and know my feelings for her.18.Please send us all the information you have about the candidate for the position.19.Until now, we have raised 50,000 pounds for the poor children, is quite unexpected.20.Among the many dangers sailors have to face,probably the greatest of all is fog.21.The museum will open in the spring with an exhibition and a viewing platformvisitors can watch the big glasshouses being built.22.Many countries are now setting up national parks animals and plants can be protected.23.We have launched another man-made satellite, is announced in today's newspaper.24.John invited about 40 people to his wedding,most of are family members.26.When I arrived,Bryan took me to see the house I would be staying.27.The book tells stories of the earthquake through the eyes of those lives were affected.28.The president of the World Bank says he has a passion for China, he remembers starting as early as his childhood.。

如何有效培养学生的分数运算能力在数学学习中，分数运算一直是学生们较为困难的一部分。

分数运算需要学生掌握基本的分数概念和运算规则，同时还需要培养学生的逻辑思维和数学推理能力。

本文将从教学方法、练习方式和学生自主学习等方面，探讨如何有效培养学生的分数运算能力。

一、教学方法1. 清晰的讲解和示范在教学过程中，老师应该清晰地讲解分数的概念和运算规则，并通过具体的例子进行示范。

可以使用图示、实物或者生活中的例子，帮助学生理解分数的含义和运算过程。

同时，老师还应该引导学生思考，让他们自己发现规律和解决问题的方法。

2. 多样化的教学资源为了激发学生的学习兴趣，老师可以使用多样化的教学资源，如教学视频、互动课件、教学游戏等。

这些资源可以帮助学生更加直观地理解分数运算，并提供多样化的练习和巩固。

3. 小组合作学习小组合作学习可以培养学生的合作意识和团队精神，同时也可以促进学生之间的互动和交流。

在分数运算教学中，可以将学生分成小组，让他们一起讨论和解决问题。

通过小组合作学习，学生可以相互启发，共同探索分数运算的奥秘。

二、练习方式1. 反复练习基本运算分数运算的基础是掌握基本的加减乘除运算。

因此，学生需要进行反复练习，熟练掌握分数的加减乘除运算规则。

可以通过练习册、作业和在线练习等方式进行，同时要注重运算过程的理解和推理能力的培养。

2. 提供挑战性的问题为了培养学生的分析和解决问题的能力，教师可以提供一些挑战性的分数运算问题。

这些问题可以涉及实际生活中的情境，或者是一些有趣的数学题目。

通过解决这些问题，学生可以锻炼自己的思维能力和创新思维。

3. 鼓励学生自主探究学生在分数运算学习中，应该被鼓励和引导去自主探究。

可以给学生一些开放性的问题，让他们自己思考和解决。

同时，教师也可以提供一些学习资源和参考资料，让学生自己去寻找答案。

通过自主探究，学生可以提高自己的学习兴趣和解决问题的能力。

三、学生自主学习1. 制定学习计划学生在学习分数运算时，可以制定一个详细的学习计划。

2015高三英语——定语从句复习1.定语：定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语或句子，汉语中常用‘……的’表示a clever boy The boiling water Fallen leaves The man who you are looking for2.定语从句：修饰某一名词或代词的从句。

Do you know the man who came to see Xiao Y ang this morning?3.先行词：被修饰的名词或代词叫先行词4.关系词引导定语从句的关联词称为关系词，关系词有关系代词和关系副词。

关系代词：_________ _________ _________ ___________ _________关系副词：______ ___________ __________一．关系代词引导的定语从句练习1：合并下列句子，判断关系词句子中充当的成分1. He is the man . I told you about him.2 These are some trees. They were planted last year.3. This recorder is made in Japan. He is using it.4 Wang Lin is our monitor. She is 16 years old.5 This is the girl. Her parents are doctors.6. This is the book .Its cover is blue.归纳that 指人/物，作___________ 或_________. which 指物，作_________或_________who指人,作____________whose 在定语从句中作__________，表示引导词，与whose 后的名词为所属关系。

四年级小学生奥数行程问题练习题1.四年级小学生奥数行程问题练习题1、一艘每小时行25千米的客轮，在大运河中顺水航行140千米，水速是每小时3千米，需要行几个小时？2、一只小船静水中速度为每小时30千米。

在176千米长河中逆水而行用了11个小时。

求返回原处需用几个小时。

3、一只船每小时行14千米，水流速度为每小时6千米，问这只船逆水航行112千米，需要几小时？4、一只船顺水每小时航行12千米，逆水每小时航行8千米，问这只船在静水中的速度和水流速度各是多少？5、甲、乙两港相距360千米，一轮船往返两港需35小时，逆流航行比顺流航行多花了5小时。

现在有一机帆船，静水中速度是每小时12千米，这机帆船往返两港要多少小时？2.四年级小学生奥数行程问题练习题1、小斌骑自行车每小时行15千米，小明步行每小时行5千米。

两人同时在某地沿同一条线路到30千米外的学校去上课。

小斌到校后发现忘了带钥匙，就沿原路回家去拿，在途中与小明相遇。

问相遇时小明共行了多少千米。

2、一辆客车从甲城开往乙城，8小时到达；一辆货车从乙城开往甲城，10小时到达。

辆车同时由两城相向开出，6小时后他们相距112千米。

甲乙两城间的公路长是多少千米？3、在400米的环形跑道上，甲乙两人同时从起跑线出发，反向而跑，甲每秒跑4米，乙每秒跑6米，当他们第一次相遇在起跑点时，他们在途中相遇了几次？4、小明回家，距家门300米，妹妹和小狗一齐向他本来，王明和妹妹的速度都是每分钟50米，小狗的速度是每分钟200米，小狗遇到王明后用同样的速度不停地往返于王明与妹妹之间。

当王明和妹妹相聚10米时，小狗一共跑了多少千米？5、甲、乙两地相距880千米小轿车从甲地出发，2小时后，大客车从乙地出发相向而行，又经过4小时两车相遇。

已知小轿车比大客车每小时多行20千米，问大客车每小时行多少千米。

3.四年级小学生奥数行程问题练习题1、卡车从南方出发，沿高速公路开往杭州。

如果每小时行90千米，已经行了2小时，此时距终点还有20千米，南京到杭州的距离是多少千米呢？2、甲、乙两地相距150千米。

从学生的练习反馈中审视复习教学
这段时间，学生完成了2010年的适应性练习一，本份试题对于刚进入总复习的九年级学生来说，还是有一定难度。

其中第14题通过流程图形式呈现情景来考查化学知识，其中涉及复分解反应发生的条件内容，对于中等或以下学生难度会更大。

14题：海洋是地球上最大的储水库，浩瀚的海洋蕴藏着丰富的化学资源。

目前世界上60%的镁是从海水中提取的。

其主要步骤如下：
（1）由无水MgCl2制取Mg的反应类型为。

（2）提取Mg的过程中，试剂A可以选用，试剂B选用。

（3）分离出Mg(OH)2后所得溶液中含有NaCl、、Na2SO4等杂质，为了获得NaCl溶液，在分离后的溶液中依次加入过量的BaCl2溶液、Na2CO3溶液，过滤，再向滤液中加入适量盐酸。

①实验中加入过量BaCl2溶液是为了除去。

②加入过量Na2CO3溶液的目的是：一方面除去原溶液中的CaCl2，另一目的是。

从学生的答题和调查情况看，一是学生对这种流程图的题目存在畏惧心理，二是对一些化学知识掌握不扎实，三是解题方法不当。

总复习的功能之一是唤醒功能，由迷糊走向明白，由散乱走向系统。

因此，在复习教学时情感与态度上要唤醒，消除学生对中考的紧张与焦虑，选题时要有梯度，以基础题为主，适当地融入中等题。

在知识与技能上也要唤醒，帮助学生构建知识体系。

在过程与方法上要唤醒学生提出“错或不会的原因在哪？”、“为什么是这样解？”。

当学生的情感与态度投入时，知识储备到一定程度时，从结果性目标来看，解题的过程与方法是起决定性作用的。

垂径定理典型例题分析： 例题1、 基本概念1．下面四个命题中正确的一个是（ ）A ．平分一条直径的弦必垂直于这条直径B ．平分一条弧的直线垂直于这条弧所对的弦C ．弦的垂线必过这条弦所在圆的圆心D ．在一个圆内平分一条弧和它所对弦的直线必过这个圆的圆心 2．下列命题中，正确的是（ ）．A ．过弦的中点的直线平分弦所对的弧B ．过弦的中点的直线必过圆心C ．弦所对的两条弧的中点连线垂直平分弦，且过圆心D ．弦的垂线平分弦所对的弧 例题2、垂径定理1.在直径为52cm 的圆柱形油槽内装入一些油后，截面如图所示，如果油的最大深度为16cm ，那么油面宽度AB 是________cm.2.在直径为52cm 的圆柱形油槽内装入一些油后,如果油面宽度是48cm ，那么油的最大深度为________cm.3.如图，已知在⊙中，弦，且，垂足为，于，于.（1）求证：四边形是正方形. （2）若，，求圆心到弦和的距离.4.已知：△ABC 内接于⊙O，AB=AC ，半径OB=5cm ，圆心O 到BC 的距离为3cm ，求AB 的长．5.如图，F 是以O 为圆心，BC 为直径的半圆上任意一点，A 是的中点，AD⊥BC 于D ，求证：AD=BF.例题3、度数问题1.已知：在⊙中，弦，点到的距离等于的一半，求：的度数和圆的半径.O CD AB =CD AB ⊥H AB OE ⊥E CD OF ⊥F OEHF 3=CH 9=DH O AB CD 21O cm 12=AB O AB AB AOB ∠OABDEF C2.已知：⊙O 的半径，弦AB 、AC 的长分别是、.求的度数。

例题4、相交问题如图，已知⊙O 的直径AB 和弦CD 相交于点E ，AE=6cm ，EB=2cm ，∠BED=30°，求CD 的长.例题5、平行问题在直径为50cm 的⊙O 中，弦AB=40cm ，弦CD=48cm ，且AB∥CD，求：AB 与CD 之间的距离.例题6、平行与相似已知：如图，是⊙的直径，是弦，，于.求证：.1=OA 23BAC ∠AB O CD 于CD AE ⊥E CD BF ⊥F FD EC =练习 一、概念题1．下列命题中错误的有（ ）（1）弦的垂直平分线经过圆心（2）平分弦的直径垂直于弦（3）梯形的对角线互相平分（4）圆的对称轴是直径A ．1个B ．2个C ．3个D ．4个2．⊙O 的直径为10，弦AB 的长为8，M 是弦AB 上的动点，则OM 的长的取值范围是（ ）A. B. C. D. 3．如图，如果为⊙直径，弦，垂足为，那么下列结论中错误的 是（ ）A. B ．C ．D ．4．如图，是⊙直径，是⊙的弦，于，则图中不大于半圆的相等弧有（ ）对。

合理把握课后习题，精准制定教学目标——以统编教材五年级上册语文《白鹭》《桂花雨》为例摘要：随着教育事业的不断发展与改革，教育部门越来越重视小学语文教学质量和水平。

而对小学语文教材进行统编，不仅可以激发学生对学习的兴趣，还能提升学习效率，从而达到教学效果。

其次，语文课后习题作为语文教学中的重要组成部分，其主要存在的目的在于给师生的“教与学”提供更多的指引，有利于学生对文本的理解，引导学生在语文课堂中掌握适合自己的学习方法，从而达到语文高效课堂。

本文根据统编教材课后习题的优势，详细的描述了统编教材课后习题的实际应用方式，以五年级统编教材为例，明确语文教学目标，促进学生语文素养的提升。

关键词：把握课后习题；教学目标；五年级语文；统编教材；引言：在新课改下，现代化教育模式越来越重视各门学科之间的整合应用和学习，在小学语文教学过程中，在课后习题的指导下，明确语文教学目标，引导学生在实际教学过程中掌握良好的学习方法，促进学生综合学习能力的提升。

其次，语文学科不仅是一门基础性课程，更是学生培养自身交际能力的重要学科。

因此，在语文教学中，老师应该把握住时机，利用课后习题的优势，落实新课改的语文教学目标，通过多样化教学手段，激发小学生的语文学习兴趣，从而达到教学效果，为学生全方面发展提供有利的基础保障。

一、统编教材课后习题的优势课后习题是教材编者根据学生需求、结合新课程标准以及文本特点进行专门编制的，也是语文教材的重要组成部分，课后习题的目标和课文中心思想有着重要的联系。

统编语文教材相比起传统教材来说，更具有针对性优势。

对学生的能力目标、教学目标都提出了细致化的要求。

充分了解课后习题的优势，认识到编者课后习题设计的目的，对学生听说读写能力的提升有着重要的意义。

二、课后习题训练的目标更加的清晰受传统教学教材的影响，在课后习题的编排上，大部分课文后面的习题设置都提出了“认真朗读课文、背诵课文的要求。

”但是，在统编版语文教材中，则提出了诵读积累的目标和要求，明确提出了在学生背诵和朗读课文中要不断的积累词汇、写作手法、以及课文表达的中心思想等具体要求。