2009小数报杯初赛试题
2009年全国小学生英语竞赛初赛赛题参考答案

2009年全国小学生英语竞赛(NECPS)五年级组初赛赛题参考答案听力部分I. 1—5 BBACCII. 6—10 YNYYNIII. A) 11—15 YNNYYB) 16—20 CABAAIV. A) 21—25 CBACA</FONT>B) 26. garden 27. purple 28. carrying; 29. eleven / 11; 30. camera附:听力部分录音原文I. 1. Amy's birthday is in August.2. Mr Wang is a doctor. He is kind and funny.3. I often read story-books on Saturdays.4. Look!There are knives beside the table.5. This plant grows slowly.II. 6. My mother usually gets up at six o'clock in the morning.7. I will go to London in the summer holiday.8. What's your favourite season?9. There is a bike in front of the car.10. Lisa climbed mountains with Tom yesterday.III. A) 11. W: Are there any animals in the zoo?12. W: What do you usually do on Sundays?M: I often play computer games.13. W: Is Father's Day on the third Sunday in June?M: Yes, it is.14. W: What time is it?M: It's seven o'clock. Oh, it's time to have dinner.W: Let's go to the restaurant.15. W: What's wrong with you?M: I've got a stomachache.W: I'm sorry to hear that.B) 16. M: Do you have a new teacher this term?W: Yes, we do. We have a new maths teacher.17. M: Can I help you, madam?W: Yes. I'm looking for a dress.18. W: Where do you live?M: I live in LondonW: What's your address?M: It's 18 North Street19. M: How do you get to school?W: I usually walk to school. What about you?M: I usually go on the bus.20. M: What are you doing, Ann?W: I'm cooking dinner for my mother.M: How helpful you are!A) (W) Hello, I'm Lucy. Welcome to my bedroom. There's a bed, a desk, two chairs, a closet, a rubbish bin and a shelf in my bedroom. The desk is near the window. There are some books on the shelf. There is a basketball under the desk. The closet is nearthe desk. The rubbish bin is behind the door. The rubbish bin is blue.B) (M) Today is Tom's birthday. Tom and his friends are in the garden. Tom's friends are playing. Tom's mother is coming. She is in a purple T-shirt. She is carrying a birthday cake. The cake has got eleven candles on it. Tom's father is coming, too. Tom's father is holding a camera.笔试部分V. 31—35 BCDAB; 36—40 DABCB; 41—45 ACBADVI. A) 46—50 BDBAC; B) 51—55 DFGBAVII. 56. answering the phone 57. turn left 58. have; picnic; 59. next month; 60. have toVIII. 61. Chinese; 62. old; 63. America; 64. wanted; 65. myselfIX.A) 66—70 BADCB; B) 71—75 TFFFTC) 76. open; 77. yard 78. call; 79. daughter; 80. closes / closedX. 参考范文:>My Children's DayToday is Children's Day. My brother and I go to a special park. There are many people in the park. First, we ride on a roller coaster. It's very exciting. I like it very much. Next, we see a whale. It's very big. We also see some lions. I think they are dangerous. After that, we ride horses. What a happy day! I'll never forget it. (66 words)XI. 82. eye; 83. B; 84. 3; 85. C; 86. 24; (3 - 1 = 2,5 - 3 = 2,7 - 5 = 2,9 - 7 = 2,5 - 2 = 3,……9 - 4 = 5,14 - 9 = 5,19 - 14 = 5,24 - 19 = 5)。
2009年小数报杯数学竞赛二年级试题

2009年“小数报杯•小小数学家”上海地区初赛二年级数学思考材料(完成时间:8:30~10:00,总分100分)学校:_____________ 姓名:____________电话号码:___________一.填空题(每题5分,共计50分)1. 2008年北京奥运会,我国运动员共获得__________ 枚金牌。
2. A、B两数的和是32, B、C两数的和是47,则C-A=_________。
3. 小明家住6楼,他用同样的速度上楼,从1楼到3楼共用了18秒,那么他从3楼走到家还要走________秒。
4. 一把破旧的尺子,上面只能看清“0,1,4,6”这几个刻度(单位:厘米)用这把尺一次可以画出________条不同长度的线段。
5. 数一数下图共有_________个正方形。
6. 13个小朋友排成一排,从前面数小明排在第8个,那么从后面数小明排在第_________个。
7. 有6个朋友开会,见面时每两人都握一次手,那么6个人共握了_________次手。
8. 如果1个篮球可以换2个足球,1个足球可以换2个排球,那么2个篮球可以换_________个排球。
9. 有一列数“5,3,2,7,0,1,5,3,2,7,0,1,……”问:第100个数是__________。
10. 一栋大楼内共有100盏灯,关掉其中的一半后,还有________盏灯。
二,操作题(每题10分,共计20分)1.用12个相同的小正方形,可以拼成几种不同的长方形?请全部画出来。
2.请你分别将下面3个正方边形平均分成3份,4份,6份,平均分成3份平均分成4份平均分成6份三,解决问题。
(每题10分,共计30分)(1)26名同学去划船,在租船处见到一块牌子(见图),怎样合理租船?总费用是多少?(2)在下列4个8之间添上“+,-,⨯,÷”或(),使下列各个等式成立。
8 8 8 8=08 8 8 8=18 8 8 8=28 8 8 8=38 8 8 8=4(3)下表是从南京到上海的动车D421次列车时刻表,请问:D421次列车从南京到上海需要多长时间?(假设列车是准点发车,准点到站)2009年“小数报杯•小小数学家”上海地区初赛二年级参考答案一、填空题(每题5分,共计50分)(1)51(2)15 (3)27 (4)6 (5)14 (6)6 (7)15(8)8 (9)7 (10)100二、操作题(每题10分,共计20分)(1)(2)平均分成3份平均分成4份平均分成6份三、解决问题(每题10分,共计30分)(1)大船租3条,小船租2条总费用3×10 + 2×8=46元(2)8 +8-8-8=08×8- 8×8=0(8+ 8)÷(8+ 8)=18÷(8×8÷8)=18÷8+8÷8=2(8+ 8+8)÷8=38×8 ÷(8+ 8)=4答案不唯一(3)2小时3分钟。
2009年全国小学生英语竞赛.doc

2009年全国小学生英语竞赛(NEPCS)低年级组决赛题听力部分(共四大题,计30分)Ⅰ.听辨单调(Words)(共5小题,计5分)听音,从A,B,C,三个选项中选出与你所听到的单词相符的图片。
每个单词读两遍。
Ⅱ.句子理解(Sentences)(共5小题,计5分)A)听音,选出你所听到的句子。
每个句子读两遍。
6.A.I want some peaches.B.I have some oranges.C.I don't like apples.7.A.His shirt is red.B.Her skirt is pink.C.My shoes are green.8.A.Is this a doll?B.Is it a ball?C.Is that a boat?9.A.What's your name?B.Where's his mum?C.What's her name?10.A.I'm in the park.B.They are going to the supermarket.C.We will go to the cinema.B)听音,判断所给图片与所听句子意思是(Y)否(N)相符。
每个句子读两遍。
Ⅲ.对话理解(Dialogues)(共10小题,计10分)A)听音,根据你所听到的对话内容,从A,B,C,三个选项中选出正确的一项完成句子。
每组对话读两遍。
16.The boy's _______ is in the bathroom.A.motherB.fatherC.brother17.Today is ______.A.cloudyB.sunnyC.windy18.Jack is wearing a ________ coat over there.A.whiteB.blackC.blue19.The girl is _______.A.17B.15C.1620.The boy can ________ fast.A.swimB.runC.walkB)听音,请根据对话内容按英文字母(A,B,C,D,E)的顺序为下列图片排序。
2009届小学数学奥林匹克竞赛预赛试题及答案

2009届小学数学奥林匹克竞赛预赛试题及答案2009届小学数学奥林匹克竞赛预赛试题及答案时间:2012-12-06 11:18 来源:世奥赛资讯站作者:世奥赛小编阅读:175次2009年小学数学奥林匹克预赛试卷及参考答案(本卷共12个题,每题10分,总分120分)1、23×( +)+13×( -)-15×( +)=( )解:原式=69/11+11+13×15/23-39/11-30/11-15×13/23=112、(1-)(1-)…(1-)=( )解:原式=1/2×2/3×3/4×4/5×……×2007/2008×2008/2009=1/20093、两个整数相除,商数=4,余数=7。
已知被除数比除数大58,那么除数是( )。
解:设除数为x。
则x+58=4x+7 x=174、四位数- =5904,如果是偶数,那么=( 8892 )。
解:8892-2988=59045、右图中的三角形都是等腰直角三角形。
图中阴影部分的面积=( )。
解:5×5÷2÷2-2×2÷2=4.256、下面是一个乘法算式,它的得数是(69104 )。
12□□×5□□□04□□70□□□□□解:1234×56=690147、一个泉水池,每分钟涌出的泉水量不变。
如果用8台抽水机工作,10小时能把水抽干;如果用12台抽水机工作,6小时能把水抽干。
那么,用14台抽水机把水抽干,需要工作( )小时。
解:设1台抽水机1小时抽的水为1份。
则每小时涌出的泉水量为(8×10-12×6)÷(10-6)=2(份)原有的水量为8×10-10×2=60(份)用14台抽水机把水抽干,需要工作60÷(14-2)=5(小时)。
2009英语报刊竞赛初赛卷预赛

Preliminary Contest 2009on Capacity of Learning via English MediaHosted by Quality Inspection Centre on China’s Foreign Language TeachingMagazinesAttention: This is the question copy. All your answers must be marked or written on the answer sheet for grading.Section One 75%I. The following multiple choice questions are based on what you have read (20%):1. Superior Court is a passage about ______.A. a crimeB. a pictureC. a filmD. a person(《英语世界》2009第5期P74-76)2. By reading US University Returning Prized Mushrooms to China, we know that thoseprecious muchrooms were___________.A. developed by a high-level Chinese delegationB. first discovered by a Chinese scholar in ChinaC. unrecorded fungal species in the whole worldD. to be compared with Chinese local fungal species(《英语周报》大学综合版2008-2009 第34期第2版)3. For whom did the woman leave the front door open even at night, according to thearticle The Door that Remained Unlocked?A. For her mother.B. For her husband.C. For her daughter.D. For her twin sister.(《大学英语》2009 第3期P10)4. Before the wedding ceremony, Cristina, the bride, runs away to the hospital, asking Dr.Bailey to arrange a surgery for her to help herself ____________.A. find a good excuse for absence from the wedding ceremonyB. stay away from the bridegroom she never lovesC. build up her confidence as an experienced surgeonD. calm down when she doesn’t feel like herself(《新东方英语》2009第73期, P28-29 )5. US President Obama recently ended the ban on federal funding for promising embryonic____________ research. Scientists believe in the future they can treat, even cure conditions ranging from diabetes to paralysis.A. stem cellB. tumor cellC. brain cellD. blood cell(《英语沙龙》时尚版总第328期P57 )6. The author of Keep Computers in Their Place believes that much of the money thatschools spend on updating and replacing computers is________.A. worthwhileB. reasonableC. unnecessaryD. ignored(《英语学习》2009 第5期P17-19)7. In Recipe for a Healthy Heart, the author describes some foods as true heart heroes. Theyare ______.A. Fish, Orange Juice, Oats, Alcohol and NutsB. Fish, milk, Oats, Alcohol and bananasC. Fish, Orange, Chocolate, beef, Wine and NutsD. Fish, Grape, eggs, Nuts, Orange juice and Wine(《英语世界》2009第5期P67-70)8. Scientists found that brain activity is linked with junk food cravings in the way that__________.A. self-control in food choices is related with two areas of the brainB. unhealthy foods will lure human brain into a dull and sleepy stateC. when one takes excessive junk food his brain functions worseD. junk food will boost the activity of certain areas of human brain(《英语周报》大学综合版2008-2009 第37期第3版)9. In the story Feels like Spring, where do ―I‖ w ork?A. In the Navy.B. In a bank.C. On a farm.D. In a subway station.(《英语学习》2009 第5期P34-36)10. Which of the following statements is true according to Feet vs. Fashion: ShoeSide-Effects?A. Shoes with soft soles and soft counters are bad to our feet.B. Pregnant women usually don’t have foot problems because they often wear flatshoes.C. Rubber shoes are helpful to sport enthusiasts in the springtime.D. People like Uggs, Crocs and flip flap because they are comfortable and healthy.(《英语沙龙》时尚版总第328期P34-36 )II. F ill in each blank with a proper word of which the first letter is given (10%):( A )Another motherly trait is multitasking. I’ve seen my wife hold one kid on her shoulders and another kid on her hip while cooking a six-course meal and talking on the phone. I get c________(1) when I hold Coke in one hand and the remote control in the other. Many times I’ve taken a drink and noticed the v________(2) go up. However, mothers can do several different …uh, stuff …or things. Sorry, my oldest kid just ran p_______(3) me and I forgot what I was writing about. Oh, yeah! A mother’s love is a________(4), and there’s one day a year specifically d________(5) for loving them back: Mother’s Day!(《英语世界》2009第5期P27)( B )Perhaps the greatest myth of U.S. inauguration hist ory is that William Henry Harrison’s long speech in chilly weather caused his death in 1841. True, Harrison didn’t wear a hat or overcoat while s________(6) for 1 hour, 40 minutes. But Harrison, 68, c________(7) extensive presidential business for weeks af ter his address. It’s unclear when Harrison caught the cold that l________(8) to his pneumonia, but he didn’t summon a doctor u_______(9) 23 days after the inauguration. He died about a week later. The ―f_______(10) speech‖ idea seems predicated on the common, but false, notion that cold weather causes a cold.(《大学英语》2009 第3期P41)III. What do the underlined words or phrases mean in Chinese (20%)?( A )She is walking down our street, wearing a checked(1) coat, grasping a grocery bag or two. I stand in the living room window and watch, and when she is close enough for me to see her face, I bolt from the house and run to meet her. She smiles in greeting, and my heart swells(2).I may take a bag from her, or she may refuse my help. In either case, I tuck my hand in the crook of her elbow, and we walk the rest of the way together.(《新东方英语》第73期P49)( B )All these situations should improve. The world should also be able to count on (3) anend to the tensions in Kenya that have crippled her output of tea and cash crops(4). Inthe case of Zimbabwe, an historically important source of food has long been stymied by President Robert Mugabe’s eccentric policies. These, too, may pass.(《英语世界》2009第5期P60 )( C )Today, with interest rates at extremely low levels and the thoughts that rates are not gonnarise for a long period of time, gold starts to become an extremely attractive asset class. And thatattraction has been alluring for many. Gold futures(5) touched one thousand dollars an ounce in February 2009, and some analysts say gold could go even higher if inflation ramps up(6), and the US Dollar takes a dive.(英语沙龙时尚版总第328期P62)( D )Two years of disastrous quality-control breakdowns, from foul fish and lead-taintedtoys to poisoned drugs and dairy products, are taking their toll(7)on China’s allure as a manufacturing platform. A new study by supply-chain consulting firm AMR found that quality concerns are among the chief reasons U.S. manufacturers are scaling back(8) plans to source more goods from China.(《大学英语》2009 第3期P7)( E )As one walks along the cobbled paths of Oxford, gazes up at the gothic sp ires, and watches the students, their robes flapping, one realizes how different Western civilizationis from the crass vigor of American enterprise and reform. Of course, American civilizationis part of Western Civilization –it is its extrapolation(9) into the present. But thisextrapolation is such that it seems less an extension than a mutation of what came before.We see this in the Starbucks franchises that have settled in next to the quirky pubs andteahouses. The coffee is excellent, but there are no surprises here, no deviations from the standardized fare, no flights of fancy(10)in the décor.(《英语学习》2009 第5期P69)IV. Choose five appropriate sentences from the seven given below and put them in theirproper places (10%)Lincoln and Darwin were both revolutionaries, in the sense that both men upendedrealities that prevailed when they were born. So considering the joint magnitude of their contributions—and the coincidence of their conjoined birthdays—it is hard not to wonder:who was the greater man? (1)_________________ But if you limit the question to influence, it bears pondering, all the more if you turn the question around and ask, what might have happened if one of these men had not been born? (2)___________ Ideas about evolution surfaced throughout the first part of the 19th century, and while none of them was as cogent as Darwin’s, it was not as though he was the only man who had the idea.Lincoln, in contrast, is sui generis. (3)____________ True, his election to the presidency did provoke secession and, in turn, the war itself, but that war seems inevitable—not a question of if but when. Once in office, he becomes the indispensable man. Certainly we know what happened once he was assassinated: Reconstruction was administered punitively and then abandoned, leaving the issue of racial equality to danglefor another century. (4)________________ He framed the conflict in language that unitedthe North—and inspires us still. If anything, with the passage of time, he only looms larger—more impressive, and also more mysterious. (5)____________(A) But here again, what Lincoln said and wrote matters as much as what he did.(B) Lincoln is a compulsive scribbler and also a compulsive reviser.(C) Take him out of the picture, and there is no telling what might have happened to thecountry.(D) Very quickly the balance tips in Lincoln’s favor.(E) Lincoln forever remains just beyond our grasp—though not for want of trying.(F) It’s an apples-and-oranges—or Superman-vs.-Santa—comparison.(G) He risked his health and his reputation to advance the idea that we are not over naturebut a part of it.(《新东方英语》第73期P44- P45 )V. The layout of the following passage is confusing. Can you correctly sequence the paragraphs (1) – (5)? (15%)Over the past few years the sun has gotten a bad raputation. Too much sunshine canput you at risk for skin cancer. And an overdose of sun can also lead to nasty sunburns, or even heatstroke.(1) Each year there are more and more studies released that suggest if you want to behealthy, vitamin D is where it’s at. Vitamin D strengthens your heart and bones, and can prevent asthama and some forms of cancer and diabetes. Some foods, like fish and eggs, are naturally brimming with the vitamin. And others, like milk and some cereals, are fortified with vitamin D.(2) Skin color and weight also help determine a person’s vitamin D needs. Darker skinfilters out more of the sun’s UV light, so people with darker skin need more sun exposure to make necessary amounts of vitamin D. For unknown reasons, heavier people also need a greater amount of UV light to enable vitamin D production.(3) But you would need to consume a lot of milk and cereal to get your daily dose ofvitamin D. Depending on a perosn’s age, people should get bewteen 5 and 15 micrograms of vitamin D each day. Without these amounts, people are prone to get diseases like rickets, which causes distorted, soft bones. These numbers, though, are really just a minimum.(4) Now some scientists suggest it’s better to get as much as five times the recommendedvitamin D dose each day. Having more foods with vitamin D is a good thing, sincethere are also several factors that make it hard to get enough of the vitamin from just the sun. One factor influencing elderly people’s vitamin D intake is that they often spend less time ourdoors. Therefore, they need more vitamin D in their diet. And if you spend a lot of your time indoors, playing video games or on the computer, you may need extra viatmin D from your food, too.(5) But the sun isn’t always bad for the body. Scientists have known for years that the sunis a great source of vitamin D. This vitamin naturally boosts the immune system, your body’s defense agianst diesease.And lastly, latitude --- how far north or south you live --- can play a major role in the sun’s ability to help you get adequate vitamin D amounts. As you get farther away from the equator, the amount of UV-filtering atmosphere increases. This means that at higher, more northern latitudes, people get less UV rays. So, if you live in a state like Alaska, most of the year you can’t get enough sun to trigger the vitamin’s production by your skin. Eating foods enriched with vitamin D or taking a daliy vitamin may not be as satisfying as breaking out yout bathing suit and lying in the sun. But the right foods and supplements can help keep you healthy until summer’s rays are here again.(《英语周报》大学综合版2008-2009 第37期第4版)Section Two 25%Solve the clues and write your answers intothe magic square. If you’ve done it correctly,your answers will read the same across anddown (4%)1) These animals like cheese.2) A picture in the mind.3) The 100th part of a dollar.4) A person does this to survive.Multiple choice (6%)1.What colors do you find on the national flag of The Kingdom of Belgium?A. Black, yellow, redB. Blue, yellow, redC. Blue, white, redD. Black, green, yellow A2. One of the following countries does not border on Luxembourg. What is it?A. BelgiumB. GermanyC. NetherlandsD. France C3. San Marino is the name of a(n) ____________.A. mountain rangeB. riverC. islandD. republic D4. Which of the following birds can fly highest?A. EaglesB. SwansC. OwlsD. Hawks B5. Richard Wagner was a celebrated __________.A. composerB. writerC. presidentD. general A6. Edward Everett, a distinguished orator, spoke for two hours at the Gettysburgbattlefield on November 19, 1863. When listening, ________ told a reporter that hisown address would be ― short, short, short.‖ And, in fact, it lasted hardly five minutes.These ten sentences have been called ― one of the great American poems.‖A. George WashingtonB. Henry WilsonC. Abraham LincolnD. Thomas Jefferson CIII. Complete the proverbs. Multiple Choice (3%)1. Spare the _____, and spoil the child.A. loveB. rodC. schoolD. stick2. A rolling stone gathers no ______.A. dustB. mossC. mudD. soil3. Prosperity makes friends, adversity ______ them.A. drivesB. triesC. helpsD. breaks4. Heaven helps those who ______ themselves.A. respectB. helpC. loveD. try5. Sweet is pleasure after _______.A. laborB. painC. tearsD. trial6. A man of words and not of deeds is like a garden full of _____.A. treesB. weedsC. cheeseD. seedsIV. Test your brains1. Joey suddenly remembered that he didn’t have his driver’s license with him. He began to wonder where he’d left it, and his attention began to wander. As he came out of the car park he ignored a red traffic light. Then he turned a corner that had a NO ENTRY sign. He went 100 meters down a one-way street the wrong way. Then he suddenly turned across the pavement and went straight into a shop. A policeman who had watched him turned away without much interest. Why? (3%)2. Andrew and Victor got into their own planes at London’s Heathrow Airport. Andrew flew exactly north. He had agreed to fly north for as far as possible, and then land. Victor flew exactly north-west. He had agreed to fly north-west for as far as possible, and then land. Andrew landed at the North-Pole. Where did Victor land? (3%)3. The gang of four that once ran the biggest protection racket eventually got out of jail. Almost immediately they began operating again in the same neighborhood. They had previously divided it into four territories: north, south, east, and west. Because each mobster had always operated in the same area, the police nicknamed them Mr. North, Mr. South, Mr. east and Mr. West.Now the police received a reliable tip that this time each mobster was operating in a new territory. None of the new victims was willing to identify the mobsters from photos the police showed them, but three facts became clear, and that was enough for the FBI to work out which mobster was operating where. These are the facts:1) Mr. East is not operating the North.2) The North territory is not being operated by Mr. South.3) The South territory is not being operated by Mr. East.Can you tell who is operating in each territory? (6%)Preliminary Contest 2009 on Capacity of Learning via English MediaAnswer Sheet姓名_________________ 学号______________________________ 英语班教师__________________ Section One 75%I.(20%)1. ___ 2. ___ 3. ___ 4. ___ 5. ___ 6. ___ 7. ___ 8. ___ 9. ___ 10. ___II.(10%) (A) (1)__________ (2) __________ (3) _________ (4) ________ (5)_________(B) (6)__________ (7) ___________ (8) _________ (9) ________ (10) _______ III.(20%) (A) (1)___________ (2) ___________ (B) (3)___________ (4)___________(C) (5)___________ (6)___________ (D) (7)___________ (8) ___________(E) (9)___________ (10)___________IV. (10%) [1]_____ [2]_____ [3]_____ [4]_____ [5]_____V. (15%) ( ) – ( ) – ( ) – ( ) – ( )Section Two 25%I. A Crossword Game (4%)1)__________ 2)__________ 3)__________ 4)__________ II. How much do you know about our world? Multiple choice (6%)1.______2._______3._______4._______5._______6._______III. Complete the proverbs. (3%)1.____2. ____3. ____4. ____5. ____6. ____IV. T est your brains1. Answer(3%):_________________________________________________2. Victor landed at (3%):____________________________________________3. Answers(6%): Mr. East →________________ Mr. West→_______________Mr. North→________________ Mr. South→ ______________。
全国大学生数学建模竞赛2009年B题

2009高教社杯全国大学生数学建模竞赛题目(请先阅读“全国大学生数学建模竞赛论文格式规范”)B题眼科病床的合理安排医院就医排队是大家都非常熟悉的现象,它以这样或那样的形式出现在我们面前,例如,患者到门诊就诊、到收费处划价、到药房取药、到注射室打针、等待住院等,往往需要排队等待接受某种服务。
我们考虑某医院眼科病床的合理安排的数学建模问题。
该医院眼科门诊每天开放,住院部共有病床79张。
该医院眼科手术主要分四大类:白内障、视网膜疾病、青光眼和外伤。
附录中给出了2008年7月13日至2008年9月11日这段时间里各类病人的情况。
白内障手术较简单,而且没有急症。
目前该院是每周一、三做白内障手术,此类病人的术前准备时间只需1、2天。
做两只眼的病人比做一只眼的要多一些,大约占到60%。
如果要做双眼是周一先做一只,周三再做另一只。
外伤疾病通常属于急症,病床有空时立即安排住院,住院后第二天便会安排手术。
其他眼科疾病比较复杂,有各种不同情况,但大致住院以后2-3天内就可以接受手术,主要是术后的观察时间较长。
这类疾病手术时间可根据需要安排,一般不安排在周一、周三。
由于急症数量较少,建模时这些眼科疾病可不考虑急症。
该医院眼科手术条件比较充分,在考虑病床安排时可不考虑手术条件的限制,但考虑到手术医生的安排问题,通常情况下白内障手术与其他眼科手术(急症除外)不安排在同一天做。
当前该住院部对全体非急症病人是按照FCFS(First come, First serve)规则安排住院,但等待住院病人队列却越来越长,医院方面希望你们能通过数学建模来帮助解决该住院部的病床合理安排问题,以提高对医院资源的有效利用。
问题一:试分析确定合理的评价指标体系,用以评价该问题的病床安排模型的优劣。
问题二:试就该住院部当前的情况,建立合理的病床安排模型,以根据已知的第二天拟出院病人数来确定第二天应该安排哪些病人住院。
并对你们的模型利用问题一中的指标体系作出评价。
2009素质赛试卷答案
燕京小学2009-2010年度第一学期六年级数学素质赛初赛试卷答案一. 快乐ABC:1、 B2、A3、C4、D5、C6、A7、C8、A9、A 10、B二. 知识百花园1、0.75 5/722、π, 3.14%3、154、1255、1.2, 5/66、31.47、 11.528、489、90平方米,54立方米 10、192三. 判断1、对2、对3、错4、错5、对四、小小神算手:(9分)1、能简算的要简算(每题3分,共6分)(1.6+1.6+1.6+1.6)×25 =4×1.6×25=4×25×1.6=100×1.6=160 101×14 =(100+1)×14 =100×14 +1×14 =25142、(3分)2×3.14×5=31.4(厘米)五、聪明设计师:(6分)计 r :10.28÷(∏+2)=2(厘米) 作 略算 图六、解决问题(共35分,每题5分)1、720÷(1-1/10)=720÷9/10=800(千克)2、1÷0.5=2(片)100÷2=50(次)50÷2=25(天)3、54-( 1-52)=51 24÷51=120吨4、2+1+1=4200÷4×2=100(米) 200÷4×1=50(米)100×50=5000(平方米)5、12÷2=6(厘米)3.14×6=18.84(厘米)6、201×544+=451 201×545+=361 1÷451=45(天)1÷361=36(天)7、1440÷(60-40)=72 72÷3×(3+5)=192两队分开买票比合起来买票多花1440元,又团体票比单人票少(60-40)=20元,1440÷20=72(人),所以两队只人数多的那一队肯定多于100人,按团体票买,否则此题无意义,那么这1440元是两队合买后人数少的团队省下的钱,所以人数少的团队应为72人,那么另一队人数应为72÷35=120(人).解答:解:人数少的团队有:1440÷20=72(人);另一队人数应为:72÷35=120(人);。
最新2017人教版小升初2009年第七届走美杯初赛六年级试题及详解
第七届“走进每秒的数学花园”中国青少年数学论坛趣味数学解题技能展示大赛初赛小学六年级试卷(A 卷)一、填空题Ⅰ(每题8分,共40分)1. 计算:++++++++++=12481632641282565121024__________ 。
解析:令12481024a =+++++ ,则22481610242048a =++++++ ,两式相减,得204812047a =-=。
2. 已知a b c ⨯-⨯=7113312,并且a ,b ,c 都不等于0,把a 、b 、c 这三个数按从小到大的顺序排列是___<___<___ 。
解析:由于1611312a b c ==,且16111312>>,所以a c b <<。
3. 下面算式中,相同汉字代表相同的数字,不同汉字代表不同数字。
那么,“数学真好玩”代表的数是___________ 。
解析: .+爱好真知数学更好数学真好玩分析:题中竖式为两个四位数相加得到一个五位数,这个五位数的首位只能为1,所以“数”1=。
再看千位,由于百位至多进1位,而“爱”+“数”1+最大为91111++=,所以“学”不超过1,而“数”为1,所以“学”只能为0.竖式变为:1010+爱好真知更好真好玩那么“真”至少为2,所以百位不可能进位,故“爱”1019=-=。
由于“好”和“真”不同,所以“真”=“好”1+,十位向百位进1位。
如果个位不向十位进位,则“真”+“更”=“好”10+,得到“更”9=,不合题意,所以个位必定向十位进1位,则“真”+“更”1+=“好”10+,得到“更”8=。
现在,“真”=“好”1+,“知”+“好”10=+“玩”。
“真”、“好”、“知”、“玩”为2,3,4,5,6,7中的数。
由于“玩”至少为2,而“知”+“好”最大为6713+=,所以“玩”为2或3.若“玩”为3,则“知”与“好”分别为6和7,此时无论“好”为6还是7,“真”都会与已有的数字重复,不合题意;若“玩”为2,则“知”与“好”分别为5和7,只能是“知”7=,“好”5=,“真”6=。
2009年“小数报杯”数学竞赛六年级初赛试题
2009年“小数报 .小小数学家”上海地区初赛六年级数学思考材料(完成时间:8:30~10:00总分120分)学校 姓名 电话号码一、 填空题(每题5分,共计50分)1、在古代,圆周率π值的精确度,代表着一个国家的数学水平。
在中国北朝时期,祖冲之求得的圆周率π值是﹤π﹤ ,这个已经精确到小数点后7位的圆周率领先世界水平1000年之久。
2、日前,美国加利福利亚大学数学家发现一个1300万位的素数。
这是已知的第46个,也是最大的梅森素数。
梅森素数是以17世纪法国数学家马丁·梅森的名字命名的,可写成“2的n 次方减1“的形式。
比如,最小的梅森素数是3,它可以写成”22-1“的形式。
100以内的梅森素数还有 。
3、计算⨯⎪⎭⎫ ⎝⎛++++⎪⎭⎫ ⎝⎛++++⨯⎪⎭⎫ ⎝⎛+++20081.......31211_20071......3121120081 (3)121=⎪⎭⎫ ⎝⎛+++20071 (31)214、如果一个两位数与它的反序数(比如:52的25)的和是一个完全平方数,则称它为“灵巧数”,请写出所有的“灵巧数” 。
5、图1是一个3×6的棋盘,棋子在A 点。
如果这枚棋子只能向右或向上走,那么,从A 点走到B 点,共有 种不同的走法。
6、从1开始,按顺序排列自然数,然后以下面的方式,分别按照1个、2个、3个、4个自然数的顺序隔开:1∣2 3∣4 5 6∣7 8 9 10∣11∣12 13∣14 15…则第六个间隔是在13和14之间。
那么,第50个间隔是在 和 之间。
图17、如图2,边长10厘米的正方形阴影部分的面积是 平方厘米(π取3.14)。
8、一个正方体木块,六个面上都写着数,相对面上的两个数之和是20。
将木块按图3位置放好,先由左向右翻转50次,再由前向后翻51次,这时,木块前面的数是 。
(每次翻转90度)9、在某汽车制造厂的实验室里进行赛车实验,甲、乙两辆赛车从相距200米的轨道两端同时相向而行,两车速度都是每秒1米。
09年全国初中数学联赛试题及答案
09年全国初中数学联赛试题及答案第一篇:09年全国初中数学联赛试题及答案09年全国初中数学联赛试题及答案时间:2009-6-3 14:33:52 点击:15833 2009年全国初中数学联合竞赛试题参考答案第一试一、选择题(本题满分42分,每小题7分)1.设,则.D.().A.24.B.25.C.2.在△ABC中,最大角∠A是最小角∠C的两倍,且AB=7,AC=8,则BC=()A.3.用表示不大于的最大整数,则方程的解的个数.B..C..D..为()A.1.B.2.C.3.D.4.4.设正方形ABCD的中心为点O,在以五个点A、B、C、D、O为顶点所构成的所有三角形中任意取出两个,它们的面积相等的概率为()A..B..C..D..5.如图,在矩形ABCD中,AB=3,BC=2,以BC为直径在矩形内作半圆,自点A作半圆的切线AE,则CBE=(D)A..B..C..D..16.设是大于1909的正整数,使得A.3.B.4.C.5.D.6.为完全平方数的的个数是()二、填空题(本题满分28分,每小题7分)1.已知是实数,若则是关于的一元二次方程的两个非负实根,的最小值是____________.2.设D是△ABC的边AB上的一点,作DE//BC交AC 于点E,作DF//AC交BC于点F,已知△ADE、△DBF的面积分别为3.如果实数满足条件,和,则四边形DECF的面积为______.,则______.4.已知_____对.是正整数,且满足是整数,则这样的有序数对共有第一试答案: ACCBDB;-3,第二试(A)一.(本题满分20分)已知二次函数别为A、B,与,-1,-7的图象与轴的交点分轴的交点为C.设△ABC的外接圆的圆心为点P.轴的另一个交点为定点.,求和的值.,设,则,.(1)证明:⊙P与(2)如果AB恰好为⊙P的直径且解:(1)易求得点设⊙P与的坐标为轴的另一个交点为D,由于AB、CD是⊙P的两条相交弦,它们的交点为点O,所以OA×OB=OC×OD,则因为,所以点在轴的负半轴上,从而点D在.轴的正半轴上,所以点D为定点,它的坐标为(0,1).(2)因为AB⊥CD,如果AB恰好为⊙P的直径,则C、D关于点O对称,所以点的坐标为即.,又,所以,解得.、分别是二.(本题满分25分)设CD是直角三角形ABC的斜边AD上的高,△ADC、△BDC的内心,AC=3,BC=4,求解作E⊥AB于E,F⊥AB 于F...在直角三角形ABC中,AC=3,BC=4,又CD⊥AB,由射影定理可得,故,.因为连接DDA=∠E为直角三角形ACD的内切圆的半径,所以、D,则D、D=.DC=∠D,分别是∠ADC和∠BDC的平分线,所以∠D=90°,所以DC=∠DB=45°,故∠D⊥.同理,可求得,.所以=.三.(本题满分25分)已知为正数,满足如下两个条件:①②证明:以为三边长可构成一个直角三角形.证法1 将①②两式相乘,得,即,即,即,即,即,即,即,即所以.因此,以或,或,即或或为三边长可构成一个直角三角形.证法2 结合①式,由②式可得,变形,得又由①式得,即③,代入③式,得.,即 4,所以或或或.或.结合①式可得因此,以为三边长可构成一个直角三角形.第二试(B)一.(本题满分20分)题目和解答与(A)卷第一题相同.二.(本题满分25分)已知△ABC中,∠ACB=90°,AB边上的高线CH与△ABC的两条内角平分线AM、BN分别交于P、Q两点.PM、QN的中点分别为E、F.求证:EF∥AB.解因为BN是∠ABC的平分线,所以又因为CH⊥AB,所以,因此.,因此C、F、H、B.又F是QN的中点,所以CF⊥QN,所以四点共圆.又,所以FC =FH,故点F在CH的中垂线上.同理可证,点E在CH的中垂线上.因此EF⊥CH.又AB⊥CH,所以EF∥AB.三.(本题满分25分)题目和解答与(A)卷第三题相同.第二试(C)一.(本题满分20分)题目和解答与(A)卷第一题相同.二.(本题满分25分)题目和解答与(B)卷第二题相同.三.(本题满分25分)已知为正数,满足如下两个条件:①②是否存在以为三边长的三角形?如果存在,求出三角形的最大内角.解法1 将①②两式相乘,得,即,即,即,即,即,即,即,即,所以.因此,以或或,即或或为三边长可构成一个直角三角形,它的最大内角为90°.解法2 结合①式,由②式可得,变形,得又由①式得,即③,代入③式,得.,即所以或或或.或.结合①式可得因此,以下载附件:为三边长可构成一个直角三角形,它的最大内角为90°.中国教育学会中学数学教学专业委员会“《数学周报》杯”2010年全国初中数学竞赛试题参考答案一、选择题(共5小题,每小题7分,共35分.其中有且只有一个选项是正确的.请将正确选项的代号填入题后的括号里,不填、多填或错填都得0分)1.若,则的值为().(A)(B)(C)(D)解:由题设得.2.若实数a,b满足,则a的取值范围是().(A)a≤(B)a≥4(C)a≤ 或a≥4(D)≤a≤4 解.C 因为b是实数,所以关于b的一元二次方程的判别式≥0,解得a≤ 或a≥4.3.如图,在四边形ABCD中,∠B=135°,∠C=120°,AB=,BC=,CD=,则AD边的长为().(A)(B)(第3题)(C)(D)解:D 如图,过点A,D分别作AE,DF垂直于直线BC,垂足分别为E,F.由已知可得(第3题)BE=AE=,CF=,DF=2,于是 EF=4+.过点A作AG⊥DF,垂足为G.在Rt△ADG中,根据勾股定理得AD =.4.在一列数……中,已知,且当k≥2时,(取整符号表示不超过实数的最大整数,例如,),则等于((A)1(B)2(C)3(D)4 解:B 由和可得,,,,).……因为2010=4×502+2,所以 =2.5.如图,在平面直角坐标系xOy中,等腰梯形ABCD的顶点坐标分别为A(1,1),B(2,-1),C(-2,-1),D(-1,1).y轴上一点P(0,2)绕点A旋转180°得点P1,点P1绕点B 旋转180°得点P2,点P2绕点C旋转180°得点P3,点P3绕点D旋转180°得点P4,……,重复操作依次得到点P1,P2,…,则点P2010的坐标是().(第5题)(A)(2010,2)(B)(2010,)(C)(2012,)(D)(0,2)解:B由已知可以得到,点,的坐标分别为(2,0),(2,).记,其中.根据对称关系,依次可以求得:,,.令,同样可以求得,点的坐标为(),即(),由于2010=4 502+2,所以点的坐标为(2010,).二、填空题6.已知a=-1,则2a3+7a2-2a-12 的值等于.解:0 由已知得(a+1)2=5,所以a2+2a=4,于是2a3+7a2-2a-12=2a3+4a2+3a2-2a-12=3a2+6a-12=0.7.一辆客车、一辆货车和一辆小轿车在一条笔直的公路上朝同一方向匀速行驶.在某一时刻,客车在前,小轿车在后,货车在客车与小轿车的正中间.过了10分钟,小轿车追上了货车;又过了5分钟,小轿车追上了客车;再过t分钟,货车追上了客车,则t=.解:15 设在某一时刻,货车与客车、小轿车的距离均为S千米,小轿车、货车、客车的速度分别为(千米/分),并设货车经x分钟追上客车,由题意得,①,② .③ 由①②,得,所以,x=30.故(分).(第8题8.如图,在平面直角坐标系xOy中,多边形OABCDE的顶点坐标分别是O(0,0),A(0,6),B(4,6),C(4,4),D(6,4),E(6,0).若直线l经过点M(2,3),且将多边形OABCDE 分割成面积相等的两部分,则直线l的函数表达式是.(第8题)解:如图,延长BC交x轴于点F;连接OB,AF CE,DF,且相交于点N.由已知得点M(2,3)是OB,AF的中点,即点M为矩形ABFO 的中心,所以直线把矩形ABFO分成面积相等的两部分.又因为点N (5,2)是矩形CDEF的中心,所以,过点N(5,2)的直线把矩形CDEF分成面积相等的两部分.于是,直线即为所求的直线.设直线的函数表达式为,则解得,故所求直线的函数表达式为.(第9题)9.如图,射线AM,BN都垂直于线段AB,点E为AM上一点,过点A作BE的垂线AC分别交BE,BN于点F,C,过点C作AM的垂线CD,垂足为D.若CD=CF,则.解:见题图,设.因为Rt△AFB∽Rt△ABC,所以.又因为FC=DC=AB,所以即,解得,或(舍去).又Rt△ ∽Rt△,所以,即 = .10.对于i=2,3,…,k,正整数n除以i所得的余数为i-1.若的最小值满足,则正整数的最小值为.解:因为为的倍数,所以的最小值满足,其中表示的最小公倍数.由于,因此满足的正整数的最小值为.三、解答题(共4题,每题20分,共80分)11.如图,△ABC为等腰三角形,AP是底边BC上的高,点D是线段PC上的一点,BE和CF分别是△ABD和△ACD的外接圆直径,连接EF.求证:(第12A题).(第12B题)(第11题)(第12B题)证明:如图,连接ED,FD.因为BE和CF都是直径,所以ED⊥BC,FD⊥BC,因此D,E,F三点共线.…………(5分)连接AE,AF,则(第11题),所以,△ABC∽△AEF.…………(10分)作AH⊥EF,垂足为H,则AH=PD.由△ABC∽△AEF可得,从而,所以.…………(20分)12.如图,抛物线(a 0)与双曲线相交于点A,B.已知点A的坐标为(1,4),点B在第三象限内,且△AOB的面积为3(O为坐标原点).(1)求实数a,b,k的值;(2)过抛物线上点A作直线AC∥x轴,交抛物线于另一点C,求所有满足△EOC∽△AOB的点E的坐标.(第12题)解:(1)因为点A(1,4)在双曲线上,所以k=4.故双曲线的函数表达式为.设点B(t,),AB所在直线的函数表达式为,则有解得,.于是,直线AB与y轴的交点坐标为,故,整理得,解得,或t=(舍去).所以点B的坐标为(,).因为点A,B都在抛物线(a 0)上,所以解得…………(10分)(2)如图,因为AC∥x轴,所以C(,4),于是CO=4.又BO=2,所以.13(第12题)设抛物线(a 0)与x轴负半轴相交于点D,则点D的坐标为(,0).因为∠COD=∠BOD=,所以∠COB=.(i)将△ 绕点O顺时针旋转,得到△.这时,点(,2)是CO的中点,点的坐标为(4,).延长到点,使得=,这时点(8,)是符合条件的点.(ii)作△ 关于x轴的对称图形△,得到点(1,);延长到点,使得=,这时点E2(2,)是符合条件的点.所以,点的坐标是(8,),或(2,).…………(20分)13.求满足的所有素数p和正整数m..解:由题设得,所以,由于p是素数,故,或.……(5分)(1)若,令,k是正整数,于是,故,从而.所以解得…………(10分)(2)若,令,k是正整数.当时,有,故,从而,或2.由于是奇数,所以,从而.于是这不可能.当时,;当,无正整数解;当时,无正整数解.综上所述,所求素数p=5,正整数m=9.…………(20分)14.从1,2,…,2010这2010个正整数中,最多可以取出多少个数,使得所取出的数中任意三个数之和都能被33整除?解:首先,如下61个数:11,,…,(即1991)满足题设条件.…………(5分)另一方面,设是从1,2,…,2010中取出的满足题设条件的数,对于这n个数中的任意4个数,因为,所以.因此,所取的数中任意两数之差都是33的倍数.…………(10分)设,i=1,2,3,…,n.由,得,所以,即≥11.…………(15分)≤,故≤60.所以,n≤61.综上所述,n的最大值为61.…………(20分)第二篇:95-08全国初中数学联赛试题2001年全国初中数学联合竞赛试题及答案2002年全国初中数学联合竞赛试题及答案2003年全国初中数学联合竞赛试题及答案2005年全国初中数学联合竞赛试题及答案2005年全国初中数学联合竞赛决赛试题及答案2006年全国初中数学联合竞赛决赛试题及答案答案:2007年全国初中数学联合竞赛决赛试题及答案答案:2008年全国初中数学联合竞赛一试试题及答案答案:2008年全国初中数学联合竞赛二试试题及答案答案:第三篇:初中数学联赛模拟试题全国初中数学联赛模拟试题(3)(考试时间2小时,满分120分)一、选择题(每小题5分,共30分)1.已知t>0,则的最大值是()2.的整数部分是a,小数部分是b,则的值为()(A)(B)(C)(D)3.在凸四边形ABCD中,AB=CD,AC为对角线,∠DAC>∠BCA,且∠DAC与∠BCA互补,∠BAC>∠ACD,且么∠BAC与∠ACD互余,则∠B等于()(A)300(B)600(C)450(D)5004.半径为1的圆的外切直角三角形的面积的最小值为()5.某个货场有1997辆车排队等待装货,要求第一辆车必须装9箱货物,每相邻的4辆车装货总数为34箱,为满足上述要求,至少应该有货物的箱数是()(A)966(B)975(C)16984(D)170096.已知⊙O1与⊙O2的半径分别为3和5,O1O2=10,则两圆的两条内公切线与一条外公切线所围成的三角形面积为()二、填空题(每小题5分,共30分)7.100人共有1000元人民币,其中任意10个人共有的钱不超过190元.那么,钱最多的人最多能有____元.8.如图,AB为半圆D的直径,AC、AD都是弦,∠CAD=∠DAB.则AC+AB与2AD的大小关系是____.9.非等腰△ABC中,D、E分别是边AB、AC上的点(不含端点).在△ABC的平面上存在点F,使△DEF与△ABC相似,则满足条件的点F有____个.10.如图,两圆同心,半径为与矩形ABCD的边AB、CD为两圆的弦.当矩形面积取最大值时,它的周长等于____.11.的最小值是.12.已知a为正整数,存在一个以a为首项系数的一元二次整系数的多项式,它有两个小于l的不同的正根.那么,a的最小值是.三、解答题(每小题20分,共60分)13.如图,在大小为4×4正方形方格中,△ABC的顶点A、B、C在单位正方形的顶点上.能否在图中画出△A1B1C1,使△A1B1C1∽△ABC(相似比不为1)且A1、B1、C1都在单位正方形的顶点上;若能,满足以上条件的相似三角形能找出几种,并说明其理由,14.如图,开口向下的抛物线与x轴交于A、B两点(点A在点B 的左侧),抛物线上另有一点C在第一象限,且使△OCA∽△OBC.(1)求OC的长及的值;(2)设直线BC与y轴交于P,当C是BP的中点时,求直线BP和抛物线的解析式。
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2009年“小数报杯•小小数学家”上海地区初赛
二年级数学思考材料
(完成时间:8:30~10:00,总分100分)
学校:_____________ 姓名:____________电话号码:___________
一.填空题(每题5分,共计50分)
1. 2008年北京奥运会,我国运动员共获得__________ 枚金牌。
2. A、B两数的和是32, B、C两数的和是47,则C-A=_________。
3. 小明家住6楼,他用同样的速度上楼,从1楼到3楼共用了18秒,那么他从3楼走到家还要走________秒。
4. 一把破旧的尺子,上面只能看清“0,1,4,6”这几个刻度(单位:厘米)用这把尺一次可以画出________条不同长度的线段。
5. 数一数下图共有_________个正方形。
6. 13个小朋友排成一排,从前面数小明排在第8个,那么从后面数小明排在第_________个。
7. 有6个朋友开会,见面时每两人都握一次手,那么6个人共握了_________次手。
8. 如果1个篮球可以换2个足球,1个足球可以换2个排球,那么2个篮球可以换_________个排球。
9. 有一列数“5,3,2,7,0,1,5,3,2,7,0,1,……”问:第100个数是__________。
10. 一栋大楼内共有100盏灯,关掉其中的一半后,还有________盏灯。
二,操作题(每题10分,共计20分)
1.用12个相同的小正方形,可以拼成几种不同的长方形?请全部画
出来。
2.请你分别将下面3个正方边形平均分成3份,4份,6份,
平均分成3份平均分成4份平均分成6份
三,解决问题。
(每题10分,共计30分)
(1)26名同学去划船,在租船处见到一块牌子(见图),怎样合理租船?
总费用是多少?
租船价目
大船(可坐6人),租费:10元/时
小船(可坐4人),租费:8元/时
(2)在下列4个8之间添上“+,-,×,÷”或( ) ,使下列各
个等式成立。
8 8 8 8=0
8 8 8 8=1
8 8 8 8=2
8 8 8 8=3
8 8 8 8=4
(3)下表是从南京到上海的动车D421次列车时刻表,请问:D421次列车从南京到上海需要多长时间?(假设列车是准点发车,准点到站)
城市 发车时间 到达时间 里程(千米)
南京 12:00 —— ——
无锡 13:10 13:08 175
上海 —— 14:03 301
2009年“小数报杯•小小数学家”上海地区初赛
二年级参考答案
一、填空题(每题5分,共计50分)
(1)51(2)15 (3)27 (4)6 (5)14 (6)6 (7)15
(8)8 (9)7 (10)100
二、操作题(每题10分,共计20分)
(1)
(2)
平均分成3份平均分成4份平均分成6份
三、解决问题(每题10分,共计30分)
(1) 大船租3条,小船租2条
总费用3×10 + 2×8=46元
(2)8 +8-8-8=0
8× 8- 8× 8=0
(8+ 8)÷(8+ 8)=1
8÷(8×8÷8)=1
8÷8+8÷8=2
(8+ 8+8)÷8=3
8× 8 ÷(8+ 8)=4
答案不唯一
(3)2小时3分钟。