历年初三毕业考试真题中考冲刺模拟检测试卷九年级下学期期末复习题下载甘肃省兰州市中考数学试卷 (2)
初三九年级毕业考试中考试题全真试卷期末复习资料下载甘肃省兰州市中考英语试卷
绝密★启用前 甘肃省初中毕业生学业考试英 语(满分150分,考试时间120分钟)一、听力理解(分5小节,共25小题;每小题1分,满分25分)第一节 听句子,选择与所听内容或语境相关的图片代码。
每个句子读两遍。
A B C D E1. ________2. ________3. ________4. ________5. ________第二节 听句子,选择恰当的情景应答语。
每个句子读两遍。
6. A. Thank you.B. I don’t think so.C. Never mind. 7. A. No, she’s busy. B. Sure, I’d love to. C. No, he can’t. 8. A. I am happy.B. My pleasure.C. It doesn’t matter. 9. A. I’m sorry to hear that. B. I really enjoyed it.C. That’s a good idea. 10. A. Just a minute, please.B. Who are you, please?C. Hello! I’m Jack.第三节 听小对话及问题,选择能回答所提问题的最佳答案。
每段对话读两遍。
11. A. Sunny.B. Rainy.C. Cloudy. 12. A. Twice a week. B. Once a week. C. Every evening. 13. A. 5 minutes.B. 20 minutes.C. 25 minutes.14. A. Because he is busy. B. Because he is tired. C. Because he has drunk. 15. A. In a library.B. At a bank.C. In a hospital.第四节 听长对话,根据其内容选出能回答下列问题的最佳答案。
甘肃省兰州市教管理第五片区2023-2024学年初中英语毕业考试模拟冲刺卷含答案
甘肃省兰州市教管理第五片区2023-2024学年初中英语毕业考试模拟冲刺卷含答案请考生注意:1.请用2B铅笔将选择题答案涂填在答题纸相应位置上,请用0.5毫米及以上黑色字迹的钢笔或签字笔将主观题的答案写在答题纸相应的答题区内。
写在试题卷、草稿纸上均无效。
2.答题前,认真阅读答题纸上的《注意事项》,按规定答题。
Ⅰ. 单项选择1、—It was really kind of you to give me a lift home.—Oh, don’t mention it. I _______pas t your house anyway.A.had come B.will come C.have come D.was coming2、--- I’d like to introduce my best friend to you , Peter .---- Thank you , Lucy . But we __________already .A.meet B.met C.will meet D.have met3、Animals as our good friends because they help us a lot.A.treat B.are treated C.treated D.were treated4、--- Excuse me, could you tell me ?--- It’s about 10 minutes by taxi.A.how far it is to go to Pukou Railway StationB.how far is it to go to Pukou Railway StationC.how long it takes to go to Pukou Railway StationD.how long does it take to go to Pukou Railway Station5、— How long have you the dictionary?— For three weeks.A.borrowed B.had C.bought6、Today is my little sister’s ______ birthday. My family will get together to celebrate it.A.nine B.ninth C.the ninth D.the nine7、—Dave, let's start our training for the basketball game.—OK. We'll lose the game we try our best.A.unless B.if C.until D.since8、The nurse won't leave her patients________she's sure they are all taken good care of.A.unless B.because C.since D.if9、I think the room is too small for us ________ .A.to live B.living in C.to live in D.live in10、-----Would you like to attend China’s Got Talent(中国达人秀)?------_________ But I’m busy revi sing for my test.A.Don’t mention it.B.I’d love lo.C.That’s all right.D.My pleasure.Ⅱ. 完形填空11、POTTERYMinh was a pottery lover and he was very interested in his grandmother’s pottery studio. So Minh was excited when his grandmother Nana invited him into her pottery studio and told him she would teach him how to make pottery. After all, Nana didn’t give all her grandchildren such a(n) 1 . Minh looked forward to putting his hands into some cold clay (陶土) and placing his bowl in the heated kiln until it hardened like stone.“Be 2 with that,” Nana said as Minh picked up one of the bowls. The boy carefully put the bowl back on the shelf and 3 his hands inside his pockets. He was anxious to get started on the lesson Nana had promised him. And he didn’t want to risk losing that 4 by breaking any of her finished pieces of pottery.Five hours later, Minh was disappointed and tired. His black work that looked more like a rock than a bowl, was a 5 on the first try. Then he made another try but it was 6 any better. However, he had at least worked out how to make a smooth opening in the center of the day. Meanwhile, Nana was keeping busy. A deep, narrow bowl and a wide, shallow bowl 7 on Nana’s worktable. Her practiced han ds began to 8 another bowl. “I’ll never get it!” Minh said, watching her work.Nana looked at her grandson and sighed, “Don’t worry, you’ll get it,” she encouraged him. “ The only way you won’t learn is if you give up.”1.A.invitation B.introduction C.presentation D.suggestion2.A.patient B.careful C.concerned D.pleased3.A.stuck B.reached C.threw D.warmed4.A.advice B.dream C.chance D.courage5.A.success B.surprise C.failure D.favourite6.A.certainly B.hardly C.probably D.nearly7.A.danced B.slept C.rose D.rested8.A.change B.wash C.touch D.shapⅢ. 语法填空12、Melbourne is in Australia. It is a beautiful city1.huge gardens, great parks and many2.(amaze) buildings.Many people came to visit it every year.Melbourne is also3.ancient city in Australia. It has an interesting history of more than 170 years. The first people came in 1835,and in the 1850s,gold 4.(discover). Because of this, Melbourne became a very rich city. Many new buildings were built at that time.And today, Melbourne is one of the world’s 5.(great) cities. It is known 6.its 7.(beautiful) and its famous universities. It is also Australia’s top city for8.(sport).Many of them are very popular. For example, young people are mad 9.soccer here. In 1956,the Olympic Games came to this city, and for the first time they were showed live on TV around the world.Melbourne is a nice place and you can always have great10.here.Ⅳ. 阅读理解A13、Sustainable(可持续的) housing refers to environmentally safe building designs. This type of housing can, either fully or partly, use renewable energy, such as sun or water, to power the homes. There are many different types of sustainable housing.Green roof homes are buildings with roofs that include different kinds of plants. The plants bring many advantages to the home, such as stopping noises from outside. Green roofs also often help keep the building cooler during the summer and warmer in the winter. They can be used as gardens for growing fruits, vegetables or flowers that improve the air quality not only for the home, but also for the nearby area.Underground homes are another type of sustainable housing. These are usually made much like traditional homes, but are built partly or fully underground. Some have moss-covered( 青苔覆盖的) roofs. Many of these houses make use of geothermal(地热) energy, or heat stored inside the Earth, to regulate temperature. Besides being underground, many of these houses have special-placed windows that allow natural sunlight to brighten them.Glass houses have walls made almost totally from glass. This allows natural light to warm the whole home during the day. These homes often turn sunlight into electricity that can power the home at night. This system reduces electricity bills and is friendly to the environment.Another type of sustainable housing is floating homes, or houseboats. These houses float on water and are typically light-weight and small in size. Some of them are filled with argon gas(氩气) which helps to keep the house afloat. Many floating homes make use of solar or power got from water flows to make electricity and heat.1.How many different types of sustainable housing are introduced?A.three. B.four. C.five. D.six.2.What does the underlined word “them” in paragraph 3 refer to?A.underground houses. B.traditional homes.C.moss-covered roofs. D.special-placed windows.3.Which of the sustainable housing are usually made much like traditional homes?A.Green roof homes. B.Underground homes.C.Glass houses . D.Floating homes.4.What can we learn from the passage?A.Green roof homes have different kinds of vegetables on their roofs.B.Underground homes use heat stored inside the houses to regulate temperature.C.Glass houses use natural sunlight to warm the house during day and night.D.Floating homes can keep afloat because they are filled with argon gas.B14、Fans of basketball all know who LeBron James is. His fans like to call him King James. The 33-year-old basketball star was again the best player in the last season of the NBA.The most popular American sports magazine Sports Illustrated also named him the best player for the fourth season in a row (连续).King James was born on December 30 in Ohio, the USA.He is 203cm tall and weighs 113kg. He is the perfect combination (结合)of strength, size and speed. Some people see him as the best physical specimen (体格范本)in sport.James beat Golden State Warriors’ player Stephen Curry, 29, to the number one place, even thou gh Curry had a great season. Last season (2015-2016), the two top players led their teams to the highest rank of the NBA.So people had different ideas about who might be the best player. James finally won the award because he helped his team Cleveland Cava liers beat Curry’s team in the NBA Finals.To his fans all over the world, James is the king. He is also a hero to many sports fans in the United Sates, especially in his hometown Cleveland. At a celebration in the city after he won the NBA Finals, James made a short speech and thanked everybody in his team. He said that he could not have won the award without them. He even bought each of them a gold headphone as a gift!James also started The LeBron James Family Foundation. It raises money and helps people in need. By now, the foundation has spent $41 million sending poor children to universities in his hometown. Maybe that is another reason why his fans love him so much.1.When was LeBron James born?A.On December 30, 1983. B.On December 30, 1984.C.On December 3, 1985. D.On December 3, 1986.2.What does the underlined word “them” refer to?A.James,teammates. B.James’ family.C.James’ fans.D.James’ friends.3.Which of the following is NOT true according to the passage?A.LeBron James is four years older than Curry.B.LeBron James is a member of Cleveland Cavaliers.C.Curry didn’t win the award because he had a bad season.D.The foundation helps poor children continue their education in James’ hometown.4.Why do so many people love James?A.Because Sports Illustrated often names him the best player.B.Because he always leads his team to beat Curry’s team.C.Because he is willing to help others and plays basketball well.D.Because he likes sending gold headphones to his fans.C15、Some people have to use public transport, some dislike it and still some love it. If everyone has a car and drives anywhere they want to go, there will be serious traffic problems on the road. Luckily, trains are a good form of public transport.British people use trains a lot. This is especially so for people who are travelling from London to Paris. Every day about 20 trains leave London. They travel at a very high speed and people feel glad that the trains take only 2 hours and 30 minutes to reach Paris. It’s much faster to trave l by train than by bus or by car. This is because people have to drive cars or buses very carefully and slowly for many reasons, such as speed limits and traffic jams. However, when you are travelling by train, the speed is almost the same and there is no traffic jam for a train.Besides, Londoners think taking a train is one of the safest ways of travelling on the ground. Trains take quite a number of quality tests while they are made. More importantly, they have to take many safety checks before they are used on the rail track.What’s more, trains in Britain are comfortable and provide fine services for their users. When you are on a London train, you will find that the train has comfortable tables and seats where people can sit. They also provide food services and power plugs(电源插头)for personal computers or mobile phones.1.The main idea of the passage is that .A.trains are a good form of public transport for LondonersB.Ifs fast to travel from London to ParisC.trains in Britain provide fine services for their usersD.people must travel by train in Britain2.In traffic jams on the road, .A.drivers can drive fast B.drivers can drive carelesslyC.cars are not moving fast D.drivers can drive happily.3.The 3rd paragraph of the passage mainly talks about the of trains.A.speed B.safety C.services D.price4.Londoners often travel by train because trains are .A.fast, safe and comfortable B.large, clean and powerfulC.fine and expensive D.cheap and clean5.What can we know from the passage?A.We can travel from London to Paris in less than 2hours.B.We can do our work with personal computers on the train.C.We have to wait till we get off the train in order to have some food.D.We can get on the train at any station without tickets.D16、Nowadays, the food that you buy comes from many different countries.Have a look in your fridge, cupboard, and fruit bowl and check the origins (来源) of the food.Perhaps there are apples from California, lamb from New Zealand, or potatoes from Egypt? You will probably be surprised how far food travels to get to your plate.This journey, from “field to plate”, is called “food miles”. A food mile is the distance that food travels from the farmer’s field to the person who buys the food.Nowadays, food often travels thousands of miles to get to the consumer (消费者).Why is this, and what are the effects (影响) of these long distances?Traditionally, farmers sold their food in the local market so the food didn’t have to travel very far.The consumers also did not travel very far, because they went to their local market to buy the food.This was a good system for farmers and consumers.However, there were some disadvantages.For example, consumers could only buy food that farmers produced locally.In addition, they could only get food that was in season.Now, because of modern technology, food comes from all over the world.We do not have to wait for spring or summer to buy strawberries or tomatoes.They are_____in winter if we want.Some countries have to import(进口) most of their food.This is because they have difficult climates.The United Arab Emirates(UAE), for example, gets 85% of its food from other countries.Even food made in the UAE often uses imported materials.What’s wrong with “food miles”? Is this not a good way of increasing international trade? I believe these miles are worrying for a number of reasons.First of all, because food travels such long distances.we need more planes, lorries, and ships to move the food.This means we use more oil or petrol, so there is more pollution and more global(全球的)warming.In addition, food that travels a long way is not fresh and usually not very tasty.Tomatoes, for example, are picked early and stored for their long journey.For this reason, they are usually tasteless when they get to the consumer.Local food has a better taste, and it also reduces the amount of global pollution.We need to buy more local food.1.The underlined word “available” in Paragraph 2 most probably means “______”.A.not busy B.easy to getC.willing to talk D.impossible to get2.Some countries like the United Arab Emirates have to import most of their food because of ____.A.long distancesB.modern technologyC.fresh and tasty foodD.difficult climates3.What is called “food miles” according to this passage?A.The journey from field to plate.B.The effects of long distances.C.The origins of the food.D.The disadvantages of imported food.4.The writer uses the LAST paragraph mostly to encourage readers to ______.A.increase international tradeB.buy more local foodC.travel long distancesD.use imported materialsE17、Colors play an important role in our world. They have different meanings to people of different cultures. Here are some colors and what they_____to various people of the world.Red is the favorite color of brides in Vietnam. In this country, red represents fortune, success, and good luck. In China red is a symbol of luck and is used for many celebrations such as weddings and the beginning of the new year. In India red is a symbol of purity and commitment, and it is used in wedding clothing. In the United States red represents love and is used during Christmas and Valentine's Day. Red also represents speed and power in the west, which is why it is a popular color for race cars and toy rockets.In Paris, all garbage collectors are clothed in green. They drive green trucks and dispose of waste in green bins. In manyparts of the world, green has become a symbol of kindness to the earth. In Ireland, green symbolizes Catholicism, and in India it is the color of Islam.Yellow is the color that symbolizes the sun. Y ellow can make people feel happy and excited, but at the same time can make people feel angrier or more frustrated. In the United States, school buses and taxicabs are often yellow, because you can see this color ruore easily. In Japan, yellow is the color of bravery.To the Japanese, Chinese, Vietnamese and Koreans, white symbolizes death. To people of India and in the west white is a color of purity.根据材料内容选择最佳答案,并将其标号填人题前括号内。
历年初三毕业考试全真试题中考冲刺模拟检测试卷九年级下期末复习下载甘肃省兰州市中考生物试卷
生物试卷 第1页(共6页) 生物试卷 第2页(共6页)绝密★启用前甘肃省兰州市2015年初中毕业生学业考试生 物本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。
满分100分,考试时间50分钟。
第Ⅰ卷(选择题 共40分)一、选择题(本题共20小题,每小题2分,共40分。
在每小题给出的四个选项中,只有一项是符合题目要求的)1.下列诗句中不属于描写生命现象的一句是( )A .春眠不觉晓B .处处闻啼鸟C .夜来风雨声D .花落知多少2.生物既能适应环境,也能影响环境。
下列现象中,能体现生物影响环境的是 ( )A .蚯蚓能疏松土壤B .水质污染造成赤潮C .荒漠中生物种类稀少D .鼠妇生活在阴暗的环境3.兰州的白兰瓜香甜多汁,这些汁液主要来自于细胞的哪个结构( )A .细胞壁B .细胞膜C .细胞质D .液泡 4.某同学玩耍时不小心划破了皮肤,他感到疼痛,这种感觉主要是由于皮肤中分布有哪种组织( )A .结缔组织B .肌肉组织C .神经组织D .上皮组织 5.百合花是一种常见的观赏花卉,将其雌蕊用刀切开后观察,图示如下,则将来可能发育成种子的结构是( )A .①B .②C .③D .④6.食物在消化道内经过消化才能进入人体,淀粉和蛋白质被彻底消化的产物分别是( )A .葡萄糖、甘油B .葡萄糖、脂肪酸C .葡萄糖、氨基酸D .氨基酸、甘油 7.哮喘是常见的呼吸系统疾病,严重时会导致肺泡的弹性回缩减弱,此情况将直接影响( )A .肺与外界的气体交换B .血液与组织细胞的气体交换C .气体在血液中的运输D .胸廓的扩张与回缩8.下列人类疾病中,由激素分泌异常引起的是( )A .糖尿病B .佝偻病C .艾滋病D .坏血病9.下列关于动物生殖、发育的叙述,错误的是( )A .蝗虫的发育过程包括受精卵、幼虫和成虫三个阶段B .青蛙和蛇的生殖过程都离不开水C .苍蝇的发育过程属于完全变态发育D .哺乳动物生殖发育的最主要特点是胎生、哺乳10.下列人体面部的各种性状中,与“有耳垂”属于一对相对性状的是( )A .单眼皮B .无酒窝C .无耳垂D .黑眼睛11.马的性别决定方式与人基本相同,其卵细胞中性染色体的组成是( )A .XXB .X 或YC .YD .X12.下列关于动物运动的相关叙述,错误的是( ) A .动物的运动形式多种多样B .鸟类飞行需要的能量来源于细胞呼吸作用C .哺乳动物任何一个动作的完成都离不开神经系统的支配D .人在做屈肘动作时肱二头肌和肱三头肌同时收缩13.学习植物分类时,某同学将水稻、西瓜、松树归为一类,把海带、地钱和肾蕨归为另一类。
历年中考全真试卷初三毕业考试九年级期末复习试题甘肃兰州中考数学试卷
( D. c tanB b
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卷
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10. 据 调 查 ,2011 年 5 月 兰 州 市 的 房 价 均 价 为 7 600 元 / m ,2013 年 同 期 将 达 到
8 200 元 / m2 ,假设这两年兰州市房价的平均增长率为 x ,根据题意,所列方程为
8.用配方法解方程 x2 2 x 1 0 时,配方后所得的方程为 CC 中, a 、b 、c 分别是∠A 、∠B 、∠C 的对边,如果 a 2 b2 c2 ,那么下列结论 正确的是 A. c sin A a B. b cos B c C. a tan A b
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甘肃省兰州市 2013 年初中毕业生学业考试
( 3班 62 4班 54 C.极差是 40 5班 58 6班 62 D.众数是 60 ( D. ( x 1) 2
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参考公式:
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1班 52
2班 60
本试卷满分 150 分,考试时间 120 分钟.
B.中位数是 58 B. ( x 1) 0
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B.兰州市明天将有 30% 的时间降水 D.兰州市明天肯定不降水 ( D. (1, 3) C. (1, 3)
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答
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( A B C D ( ) A. 7 600(1 x%)2 8 200 C. 7 600(1 x)2 8 200 11. 已知 A(1, y1 ) , B(2, y2 ) 两点在双曲线 y ) A. m>0 B. m<0 C. m> B. 7 600(1 x%)2 8 200 D. 7 600(1 x)2 8 200 2.“兰州市明天降水概率是 30% ”,对此消息下列说法中正确的是 A.兰州市明天将有 30% 的地区降水 C.兰州市明天降水的可能性较小
历年初三毕业考试全真试题中考冲刺模拟检测试卷九年级下期末复习下载甘肃省兰州市中考英语试卷
绝密★启用前 甘肃省兰州市2015年初中毕业生学业考试英 语(满分150分,考试时间120分钟)一、听力理解(分5小节,共25小题;每小题1分,满分25分)第一节 听句子,选择与所听内容相符的图片。
每个句子读两遍。
ABCDE1. ________2. ________3. ________4. ________5. ________ 第二节 听句子,选择恰当的应答语。
每个句子读两遍。
6. A. French.B. Red.C. Taxi. 7. A. Hold on, please. B. Have a good time! C. What a pity! 8. A. About two hours. B. For 5 years. C. Almost twice a week. 9. A. Well done!B. No, thanks.C. Sure, my pleasure. 10. A. I really enjoy it.B. Take it easy.C. Go ahead.第三节 听对话及问题,选择能回答所提问题的最佳答案。
每段对话读两遍。
11. What did Linda have for breakfast? A. Beef noodles.B. Porridge.C. Bread.12. How does Susan improve her reading? A. By taking notes.B. By studying with a group.C. By reading for fun.13. Why is Mrs. Black so happy?A. Because it ’s her birthday.B. Because her son ’s coming.C. Because her books sell well. 14. Where is the Tower of London? A. Near Big Ben.B. Next to Tower Bridge.C. Across from London Eye. 15. What does Tom ’s math teacher look like? A. He ’s tall and handsome.B. He ’s a little bit heavy.C. He ’s kind of short.第四节 听长对话,根据其内容选出能回答下列问题的最佳答案。
最新初三毕业考试全真试卷历年中考真题复习试题下载甘肃省兰州市中考语文试卷
绝密★启用前甘肃省兰州市初中毕业生学业考试语 文本试卷满分150分,考试时间120分钟。
一、语言积累与运用(30分)1.下列词语中,加点字的读音完全正确的一项是(3分)( )A .孕.育(y ùn) 地窖.(jiào) 叱咤.(chà)风云 B .冗.杂(r ǒn g ) 锃.亮(chén g ) 面面相觑.(qù) C .招徕.(lái) 绮.(qǐ)丽 相形见拙.(zhuō) D .恻.(cè)隐挑衅.(xìn)气冲斗.(dǒu)牛 2.下列各句中,加点成语使用有误的一项是(3分)( )A .小草虽然是微不足道....的角色,它却以顽强的生命力为世人所钦佩和赞颂。
B .曹文轩的许多作品都会把关注的重点放在一些小巧玲珑....的生活细节上。
C .他们两人的爱好、处事方法迥然不同....,谁也没法了解谁,谁也没法改变谁。
D .传说中开天辟地的盘古,只是众神之一,影响不大,从未享受过顶礼膜拜....的待遇。
3.下面两个语段都出自杨绛的散文《老王》,根据语境,在【甲】【乙】两处填写标点符号,正确的一项是(3分)( )语段一:有一天傍晚,我们夫妇散步,经过一个荒僻的小胡同,看见一个破破落 落的大院,里面有几间塌败的小屋【甲】老王蹬着他那辆三轮车进大院去。
(画线语句是对“我们夫妇”在“荒僻的小胡同”看到的两个场景的描述)语段二:我谢了他的好香油,谢了他的大鸡蛋,然后转身进屋去。
他赶忙止住我 说:“我不是要钱。
”我也赶忙解释:“我知道,我知道【乙】不过你既然来了,就免得托人捎了。
”(画线语句是从说“‘我’知道老王不要钱”转换到说“老王来了,‘我’就不用捎钱了”)A .【甲】破折号 【乙】破折号B .【甲】分号 【乙】句号C .【甲】破折号 【乙】句号D .【甲】分号 【乙】破折号 4.下列各句中,没有病句的一句是(3分)( )A .能否顺利开展大课间活动,也是提高学生身体素质的重要保障条件。
初三毕业考试全真试卷九年级期末试题检测复习资料下载甘肃省中考英语试卷
英语试卷 第1页(共18页)英语试卷 第2页(共18页)绝密★启用前甘肃省初中毕业生学业考试英 语本试卷满分150分,考试时间120分钟。
第Ⅰ卷(选择题 共80分)一、听力理解(分四小节,共20小题;每小题l 分,满分20分)第一节 信息选择听下面5个句子,从A 、B 、C 三个选项中选出你所听到的信息。
每个句子读两遍。
现在你有20秒钟时间浏览每个小题。
1. A. reporter B. listener C. dancer2. A. proud B. pleasant C. patient3. A. imagine B. impress C. improve4. A. 30 B. 3 C. 135. A. I made it. B. I bought it. C. George made it.第二节 情景反应听下面5个句子,从A 、B 、C 三个选项中选择一个恰当的应答语。
每个句子读两遍。
现在你有20秒钟时间浏览各个选项。
6. A. Thank you. B. No, it isn ’t. C. It ’s OK.7. A. Hello! B. Congratulations! C. See you!8. A. You, too. B. Sure. C. Just a little.9. A. It ’s too big. B. You can ’t miss it. C.It ’s over there.10. A. Sorry to hear that.B. Well done!C. You ’d better not.第三节 对话理解听下面5小段对话和问题,根据你所听到的内容,从A 、B 、C 三个选项中选出一个能恰当回答所提问题的选项。
每段对话读两遍。
现在你有20秒钟时间浏览各个选项。
11. A. He rides his bike. B. He takes a bus. C. He walks.12. A. To borrow some books.B. To lend some books.C. To return some books. 13. A. He has a toothache. B. He has trouble with math. C. He broke his arm.14. A. Next Monday. B. Next Tuesday. C. Next Wednesday.15. A. Because he likes skating.B. Because he likes snow.C. Because he likes flying kites. 第四节 短文理解。
2024年甘肃省兰州市九年级中考数学模拟押题预测试题
2024年甘肃省兰州市九年级中考数学模拟押题预测试题一、单选题1.中国古代著作《九章算术》在世界数学史上首次正式引入负数.如果在检测一批足球时,随机抽取了4个足球进行检测,其中超过标准质量的克数记为正数,不足标准质量的克数记为负数.从轻重的角度看,最接近标准的是()A.B.C.D.2.图中三棱柱的主视图是()A.B.C.D.3.不等式组215840xx-≤⎧⎨-<⎩的解集在数轴上表示为()A.B.C.D.4.如图,在ABC V 中,AB AD DC ==,62B ∠=︒,则C ∠的度数为( )A .30︒B .32︒C .31︒D .48︒5.化简233y x x ⎛⎫ ⎪⎝⎭的结果是( ) A .6xy B .xy 5 C .25x y D .26x y6.若点()13,A y ,点()22,B y -,点()2,6C 都在一次函数7y kx =+的图象上,则1y 与2y 的大小关系是( ) A .12y y <B .12y y =C .12y y >D .无法确定7.古代数学趣题:老头提篮去赶集,一共花去七十七;满满装了一菜篮,十斤大肉三斤鱼;买好未曾问单价,只因回家心里急;道旁行人告诉他,九斤肉钱五斤鱼.意思是:77元钱共买了10斤肉和3斤鱼,9斤肉的钱等于5斤鱼的钱,问每斤肉和鱼各是多少钱?设每斤肉x 元,每斤鱼y 元,可列方程组为( ) A . 1037795x y x y +=⎧⎨=⎩B . 3107795x y x y +=⎧⎨=⎩C . 1037759x y x y +=⎧⎨=⎩D . 3107759x y x y +=⎧⎨=⎩8.图1是一个由齿轮、轴承、托架等元件构成的手动变速箱托架,其主要作用是动力传输.图2是手动变速箱托架工作时某一时刻的示意图,已知AB CD ∥,CG EF ∥,150BAG ∠=︒,130DEF ∠=︒,则AGC ∠的度数为( )A .60︒B .80︒C .100︒D .110︒9.如图,在矩形ABCD 中,610AB AD ==,,点P ,Q 分别在AB CD ,上,PQ AD ∥,线段EF 在PQ 上,且2EF =,连接AE CF ,,则AE CF +的最小长度为( )A .8B .10C .12D .1610.如图,电路上有三个开关和一个小灯泡,合上任意两个开关,小灯泡发光的概率为( )A .13B .12C .23D .111.关于二次函数2(3)2y x =+-,下列说法错误的是( )A .图象的开口方向向上B .图象的顶点坐标为(3,2)--,函数的最小值为2-C .图象的对称轴为直线3x =-,当3x <-时,y 随x 的增大而减小D .图象可由抛物线2y x =向右平移2个单位长度,再向上平移3个单位长度得到 12.如图,在四边形ACDB 中,AB CD ∥,AC AD =,P 是线段AC 上一点(不与点A C 、重合),60C PDB ∠=∠=︒,连接BP ,交AD 于点Q ,则 DQBP ∶的最小值是( )A .B C D二、填空题13.分解因式:2818a -=.14.图①是一台笔记本电脑实物图,如图②,当笔记本电脑的张角150AOB ∠=︒时,顶部边缘A 处离桌面的高度AC 的长为11cm ,当笔记本电脑的张角108A OB '∠=︒时,顶部边缘A '处离桌面的高度A D '的长约为cm .(A 的对应点是点A OA OA '=',)(参考数据:sin 720.95︒≈,cos720.31︒≈,tan 72 3.08︒≈,结果精确到1cm )15.某种油菜籽在相同条件下发芽试验的结果如下:这种油菜籽发芽的概率的估计值为(精确到0.01).16.如图,ABC V 内接于O e ,AB 为O e 的直径,I 为ABC V 的内心,连接OI AI BI ,,.若1O I B I O I ⊥=,,则AB 的长为.三、解答题17.化简:()()()22226x y x y y x y -+--+-. 18.计算:(2))(215+19.在ABC V 中,35AB AC ==,.(1)直接写出BC 的取值范围是_________; (2)求BC 边上的中线AD 的取值范围.20.如图,在78⨯网格中,每个小正方形边长为1个单位长度,我们把每个小正方形的顶点称为格点;A ,B ,C 均为格点;请按要求仅用一把无刻度的直尺作图.(1)在图1中,作CD AB ∥(D 在BC 下方),且D 为格点;(2)在图2中找一格点E (E 在AB 上方),画出三角形ABE ,使得8ABE S =V . 21.【问题情境】如图,在菱形ABCD 中,对角线AC ,BD 相交于点O .过点A 作AE BD P ,过点D 作DE AC ∥交AE 于点E .【探索求证】(1)求证:四边形AODE 是矩形; 【问题解决】(2)连接OE ,交AD 于点M ,过点D 作DN OE ⊥,垂足为点N ,若6AE =,60ABC ∠=︒,求DN 的长.22.蓬勃发展的快递业,为全国各地的新鲜水果及时走进千家万户提供了极大便利.不同的快递公司在配送、服务、收费和投递范围等方面各具优势.草莓种植户小丽经过初步了解,打算从甲、乙两家快递公司中选择一家合作,为此小丽收集了10家草莓种植户对两家公司的相关评价,并整理、描述、分析,下面给出了部分信息:a.配送速度得分(满分10分):甲:67788889910乙:778889991010b.服务质量得分统计图(满分10分):c.配送速度和服务质量得分统计表:根据以上信息,回答下列问题:(1)求出表中,m n的值;(2)在甲乙两家快递公司中,如果某公司服务质量得分的10个数据的波动越小,则认为种植户对该公司的评价越一致.据此推断:甲、乙两家公司中,种植户对___________的服务质量的评价更一致(填“甲”或“乙”);(3)根据以上数据,小丽应该选择哪一家快递公司?请说明理由.(写出一条理由即可) 23.如图所示是一种户外景观灯,它是由灯杆AB 和灯管支架BC 两部分构成,现测得灯管支架BC 与灯杆AB 的夹角127ABC ∠=︒,同学们想知道灯管支架BC 的长度,借助相关仪器进行测量后结果如下表:求灯管支架BC 的长度.(参考数据:sin370.6︒≈,cos370.8︒≈,tan370.75︒≈,tan6326 2.00'︒≈)24.【发现问题】小明和小强做弹球游戏,如图1,小明向斜坡抛一个乒乓球,乒乓球弹起的运行路线是一条抛物线,乒乓球落地后又弹起,第二次弹起的运行路线和第一次运行路线的抛物线形状相同,小强在地面立一块高度为0.4m 的木板,当乒乓球在第二次下落时能落在木板上,则小强获胜. 【提出问题】小强将木板放在距斜坡底端多远,才能确保获胜? 【分析问题】小强以斜坡底端O 为坐标原点,地面水平线为x 轴,取单位长度为1m ,建立如图2所示的平面直角坐标系,乒乓球的大小忽略不计,经测量发现,抛球点A 的坐标为()1,3.36-,第一次弹起的运行路线最高点坐标为()0.5,3.61-,第二次弹起的最大高度为1.21m ,小强通过这些数据,经过计算,确定了木板立的位置,从而确保自己获胜.【解决问题】(1)求乒乓球第一次弹起运行路线的抛物线的解析式; (2)求乒乓球第一次落地点B 距斜坡低端O 的距离;(3)小强将木板立在距斜坡底端O 多远的范围内,才能确保自己获胜? 25.已知直线y x =与反比例函数4y x=的图象在第一象限交于点M .(1)如图,将直线y x =向上平移b 个单位后与4y x=的图象交于点()1,A m 和点(),1B n -,求A 、B 的坐标和b 的值;(2)在(1)的条件下,设直线AB 与x 轴、y 轴分别交于点C 、D ,求AOB V 的面积. 26.如图,AB 是O e 的直径,点C 在O e 上,BD 平分ABC ∠交O e 于点D , 过点D 作DE BC ⊥于E .(1)求证:DE 是O e 的切线; (2)若10AB =,6AD =,求EC 的长.27.将平面直角坐标系xOy 中的一些点分成两类.每类至少包含两个点.对于同一类中的任意两点M x 1,y 1 ,N x 2,y 2 ,称12x x -与12y y -中的最大值为点M 和点N 的“垂平距离”,记作(),d M N .将各类中任意两点间的最大“垂平距离”记为该类的“星内距离”,两个“星内距离”的最大值定义为这种分类的“星系距离”.如图,()3,0A -,()1,1B -,()0,1C -,()2,2D ,()1,3E -.(1)点A , B ,E ,O 中,与点C 的“垂平距离”为3的点是______;(2)①点P 是平面内的一个动点,若将点B ,D ,P 分在同一类时,该类的“星内距离”是4,则动点P 所构成图形的面积为______;②已知直线y x b =+上恰好存在唯一的一个点Q ,满足将点B ,D ,Q 分在同一类时,该类的“星内距离”是4,求b 的值;(3)已知直线l 平行于2y x =-,与x 轴交于点(),0t ,若l 上的任意一点R 均满足将点A ,B ,C ,D ,E ,R 分为两类时,所能得到的最小的“星系距离”大于4,请直接写出t 的取值范围______. 28.综合与实践 【问题情境】如图1,小华将矩形纸片ABCD 先沿对角线BD 折叠,展开后再折叠,使点B 落在对角线BD 上,点B 的对应点记为B ',折痕与边AD ,BC 分别交于点E ,F . 【活动猜想】(1)如图2,当点B '与点D 重合时,四边形BEDF 是哪种特殊的四边形?并给予证明. 【问题解决】(2)如图1,当4AB =,8AD =,3BF =时,连接B C ',则B C '的长为______. 【深入探究】(3)如图3,请直接写出AB 与BC 满足什么关系时,始终有A B ''与对角线AC 平行?。
最新历年中考真题初三九年级毕业考试全真试卷下载甘肃省兰州市中考语文试卷
绝密★启用前甘肃省兰州市初中毕业生学业考试语 文本试卷满分150分,考试时间150分钟。
一、语言积累与运用(30分)1.下列词语中,加点字的读音完全正确的一项是(3分) ( )A .女娲.(w ā) 分.(f èn )外 猝.(cu ì)然长逝 B .门楣.(m éi ) 咆.(p áo )哮 众目睽(ku í)睽. C .干涸.(g ù) 窈.(y ǎo )窕 兀.(w ù)兀穷年 D .广漠.(m ò) 忏.(qi àn )悔 怡.(y í)然自得 2.下列各句中,加点的词语使用不正确的一项是(3分) ( ) A .由于地势高,能见度也特别高,远近景物历历在目....。
B .富有创造性的人总是孜孜不倦....地汲取知识,使自己学识渊博。
C .经过14年的建设,黄河风情线独具特色的景观,令人叹为观止....。
D .“兰州玫瑰节”吸引了众多的游客,特别是开幕那天,游人鳞次栉比....。
3.下列各句中,有语病的一句是(3分)( )A .能不能切实提高广大市民的综合素质,是创建文明城市的关键。
B .月球车“玉兔”其实是一个小型化、低功耗、高集成的机器人。
C .兰州地铁的建成和投运,将极大地缓解当地交通拥堵状况。
D .近日,中国读者以各种方式表达对诺贝尔文学奖获得者马尔克斯的追念。
4.依次填入下面横线处的语句,衔接最恰当的一组是(3分)( )纪录片《舌尖上的中国》第二季,又一次让国人回味无穷。
______,______,______,______。
①也不仅仅是这些美食的前世今生 ②以及故事背后中国社会的剧烈变革③还有美食背后那些来自乡野、来自草根的命运故事④只是,这一回的“舌尖”,让人回味的不仅仅是镜头前的美食 A .④①②③B .④①③②C .③②①④D .④③②①5.下列关于文学作品中的马的表述,不正确的一项是(3分) ( )A .《三国演义》中的的卢马曾载着刘备逃离险境。
2024届甘肃省兰州市联片初中英语毕业考试模拟冲刺卷含答案
2024届甘肃省兰州市联片初中英语毕业考试模拟冲刺卷含答案注意事项1.考试结束后,请将本试卷和答题卡一并交回.2.答题前,请务必将自己的姓名、准考证号用0.5毫米黑色墨水的签字笔填写在试卷及答题卡的规定位置.3.请认真核对监考员在答题卡上所粘贴的条形码上的姓名、准考证号与本人是否相符.4.作答选择题,必须用2B铅笔将答题卡上对应选项的方框涂满、涂黑;如需改动,请用橡皮擦干净后,再选涂其他答案.作答非选择题,必须用05毫米黑色墨水的签字笔在答题卡上的指定位置作答,在其他位置作答一律无效.5.如需作图,须用2B铅笔绘、写清楚,线条、符号等须加黑、加粗.Ⅰ. 单项选择1、We are too tired. Let’s stop ________ a drink.A.having B.to have C.have D.to having2、—I come back to school before 10 o'clock?— No, you needn't.A.Must B.Can C.May D.Should3、Tintin appeared in China in____1980s. He has red hair and ____small white dog.A.the; a B.a; the C.不填;a D.the; 不填4、I enjoy fresh air so always sleep with the window open ______ it is really cold.A.unless B.when C.if D.Since5、For an artist who has no lack of passion and great courage to overcome any difficulties, his inspirations of art will never______A.calm down B.pass on C.wake up D.run out6、Reading is a good way to spend the time on the plane. So I often go traveling ________ a book.A.with B.about C.for7、---_______I smoke here, Madam?---Sorry, you _______. Look at the sign.A.Could, couldn’t B.Can, couldn’tC.Could, can’ D.Must, needn’t8、Jane any letter to her friends since she left home.A.doesn’t write B.didn’t write C.hasn’t written D.won’t write9、--______ will the discussion last?--______ we reach an agreement.A.How long; Not until B.When; Not untilC.How long, Until D.When, Until10、—Can you spare time to come to our Thanksgiving party?—Well, I don’t knowA.that I can finish my work by thenB.if can I finish the work by thenC.whether I can finish the work by thenⅡ. 完形填空11、Nowadays, it is very 1 for us to live a low-carbon life. The first thing we can do is 2 bikes instead of driving cars. First, bikes are 3 than cars and eve ryone can afford it .Second, it’s easier 4 parking places for bikes. Third, the petrol is not necessary for bikes, so bikes won’t produce dirty air to make pollution to our environment. Finally, we can ride bikes to keep 5 Let’s ride bikes instead of driving cars to protect the environment! 1.A.importance B.easy C.difficult D.important2.A.ride B.rides C.riding D.rideing3.A.much cheap B.much cheaper C.much dearer D.smaller4.A.to find B.find C.look for D.find out5.A.fast B.slowly C.easy D.fit.Ⅲ. 语法填空12、IV.语法填空:用所给单词的适当形式填空,未提供单词的根据上下文填入适当的词。
2024届甘肃省兰州市中考物理最后冲刺浓缩精华卷含解析
2024届甘肃省兰州市中考物理最后冲刺浓缩精华卷考生请注意:1.答题前请将考场、试室号、座位号、考生号、姓名写在试卷密封线内,不得在试卷上作任何标记。
2.第一部分选择题每小题选出答案后,需将答案写在试卷指定的括号内,第二部分非选择题答案写在试卷题目指定的位置上。
3.考生必须保证答题卡的整洁。
考试结束后,请将本试卷和答题卡一并交回。
一、单项选择题(本大题7小题,每题3分,共21分)1.如图所示,水平桌面上放置有甲、乙两个完全相同的圆柱形烧杯.....,分别装入适量的密度不同的盐水,将同一个鸡蛋先后放入甲、乙两个烧杯中,鸡蛋在甲烧杯中处于悬浮状态,在乙烧杯中处于漂浮状态,最后甲乙容器液面一样高.下列判断正确的是A.甲杯中盐水密度为ρ甲,乙杯中盐水密度为ρ乙,则ρ甲大于ρ乙B.放入鸡蛋后,烧杯底部受到的压强分别为p甲和p乙,则p甲小于p乙C.鸡蛋在甲、乙两烧杯中受到的浮力分别为F浮和F浮’,则F浮大于F浮’D.放入鸡蛋后,甲、乙两烧杯对桌面的压力分别为F甲和F乙,则F甲等于F乙2.为了使教室内的学生免受环境噪声干扰,下列方法中有效、合理的是A.老师讲话的声音小一些B.教室内安装噪声监测装置C.在教室周围植树D.每个小学生都带一个防噪声的耳罩3.如图,在“探究杠杆的平衡条件”实验中,已知杠杆上每个小格长度为2cm,当弹簧测力计在A点斜向上(与水平方向成30°角)拉杠杆,使杠杆在水平位置平衡时,测力计的示数为3N.下列说法正确的是A.动力臂为OA,大小为8 cmB.此时为省力杠杆C.钩码总重为2 ND.若改为竖直向上拉A点,则为了保持杠杆水平位置平衡,测力计的示数应大于3N4.下列有关声音的说法中,错误的是A.敲击鼓面,看到鼓面上的泡沫颗粒跳动,说明声音是由物体的振动产生的B.把正在响铃的闹钟放在玻璃罩内,逐渐抽出其中的空气,音量减弱,说明空气能够传声C.直尺伸出桌面的长度越短,拨动时发出的声音音调越高,说明响度由频率决定D.发声的扬声器外,烛焰晃动,说明声音可以传递能量5.某同学用如图甲所示的实验装置比较不同物质的比热容.用铁夹将温度传感器及分别盛有水和食用油的两个试管固定在铁架台上,温度传感器的探头部分与试管内的水和食用油良好接触,两只温度传感器通过数据采集线与计算机相连接.在计算机上打开与此仪器配套的专用软件,点击“开始记录”,同时打开红外加热器开关,对盛有水和食用油的试管进行加热,在计算机上可以得到相应的实验图线,如图乙所示.下列说法错误的是()A.两个试管中必须盛有质量相同的水和食用油B.同时打开红外加热器开关的目的是使水和食用油升高相同的温度C.图线b表示水的温度随时间变化的规律D.食用油的比热容为2.1×103 J/(kg·℃)6.汽车里的乘客突然前倾,由此可以判断这辆汽车的运动状态可能是A.静止B.匀速行驶C.突然刹车D.突然开动7.根据你掌握的安全用电常识,下列做法正确的是A.小洁在电线上晾衣服B.小芳用湿毛巾擦台灯的灯泡C.小强使用测电笔时手接触笔尾的金属体D.小华在一个多功能插座上同时使用多个大功率用电器二、填空题(本大题7小题,共21分)8.2019年4月10日,人类首张黑洞照片面世。
甘肃省兰州市永登县2024年初中英语毕业考试模拟冲刺卷含答案
甘肃省兰州市永登县2024年初中英语毕业考试模拟冲刺卷含答案注意事项:1.答题前,考生先将自己的姓名、准考证号码填写清楚,将条形码准确粘贴在条形码区域内。
2.答题时请按要求用笔。
3.请按照题号顺序在答题卡各题目的答题区域内作答,超出答题区域书写的答案无效;在草稿纸、试卷上答题无效。
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Ⅰ. 单项选择1、-Have you found the information about the famous people ______ you can use for the report?-Not yet. I’ll search some on the Internet.A.who B.what C.whom D.which2、How can we improve our environment a lot each of us does something useful for it?A.while B.until C.after D.unless3、--- __________ exciting news it is to have undergrounds in Changzhou soon! Do you know when Metro Line 1 will open?--- _________ the end of 2019.A.How; Until B.What; Not until C.What; Until D.How; Not until4、He seldom stays up late at night, ______ necessary, to keep himself full of energy the next day.A.if B.unless C.until D.while5、— Cindy never eats the food that ______ and often pours it away.—But it’s really wastefull to do so.A.stays B.keeps C.remains D.leaves6、China’s homegrown passeng er plane C919 ________ on its first flight in Shanghai on May 5, 2017.A.took off B.took out C.took up D.took away7、— Do you have any plans for the winter holiday?— Since you are crazy about music, why not go to some ________ concerts?A.lively B.live C.alive D.living8、--- TuYouyou has won the Nobel Prize.--- ______ great she is! We Chinese are so proud of her.A.What a B.What C.How a D.How9、— Can you tell me ____ last year?— In Shanghai.A.where does she work B.where she worksC.where did she work D.where she worked10、—Could you help me carry this box? It’s too heavy.—__________.A.It’s my pleasure B.With pleasure C.That’s all right D.That’s okⅡ. 完形填空11、For many students, summer is a time for playing outside. However, for Liam Hannon, the summer of 2017 was a bit 1 .That year, he joined an online learning program, which 2 him to give back to the community (社区). He was given a task to help homeless people.Liam 3 to his dad that there were a lot of homeless people just outside their home. These people were hungry and they could use something to lift their 4 . Liam and his dad began to make sandwiches and handed them out to the homeless people.In order to help more homeless people, Liam created an online page to help raise money. 5 , a lot of people supported his idea. Donations (捐赠) that were received through the website GoFundMe have made it possible for Liam to 6 a better cart and make thousands of more lunches. “I have seen people who are feeling really 7 on themselve s. But when we hand them a lunch, their faces just light up.” says Liam.Now, Liam has another 8 called Legos of Love. People send in their old Lego blocks, which are then sorted (分类) and given to homeless children.This now 12-year-old boy 9 knows how to pay it forward. What he has done is an example of how even something as 10 as a sandwich can change the world.1.A.fashionable B.annoying C.silent D.different2.A.challenged B.treated C.accepted D.ordered3.A.made a mess B.told a joke C.pointed out D.held on4.A.weights B.spirits C.hands D.voice5.A.Humorously B.Confidently C.Crazily D.Luckily6.A.buy B.serve C.consider D.share7.A.down B.surprised C.nervous D.excited8.A.homework B.victory C.advantage D.project9.A.surely B.thankfully C.carefully D.strictly10.A.delicious B.necessary C.simple D.expensiveⅢ. 语法填空12、阅读下面短文,在空白处填入一个适当的单词或括号内单词的正确形式。
初三九年级毕业考试中考试题全真试卷期末复习资料下载甘肃省兰州市中考化学试卷
化学试卷 第1页(共10页) 化学试卷 第2页(共10页)绝密★启用前甘肃省初中毕业生学业考试化 学(本试卷满分100分,考试时间100分钟)可能用到的相对原子质量:H 1— C 12— O 16— S 32— Fe 56—一、选择题(本题共25小题,第1~10题每小题1分,第11~25题每小题2分,共40分。
在每小题给出的四个选项中,只有一项是符合题目要求的) 1.下列四个短语中,其原意一定包含化学变化的是( ) A .花香四溢B .海市蜃楼C .木已成舟D .蜡炬成灰2.通过实验,得出空气是由氧气和氮气组成这一重要结论的科学家是( ) A .拉瓦锡B .道尔顿C .门捷列夫D .阿伏加德罗 3.下列物品所使用的材料中,不属于有机合成材料的是( ) A .尼龙绳子B .汽车轮胎C .陶瓷花盆D .塑料水杯 4.下列化学用语与意义对应不相符的是( )A .2O :一个氧分子B .4Ne :四个氖原子C .2SiO :二氧化硅D .2+2Mg :两个镁离子带两个单位的正电荷 5.下列仪器,既能作反应容器又能直接加热的是( ) A .烧杯B .集气瓶C .锥形瓶D .试管 6.下列物质富含糖类的是( ) A .奶油B .豆腐C .玉米D .黄瓜 7.下列方法中,不能防止钢铁腐蚀的是( ) A .表层镀铬B .食盐水浸泡C .制成合金D .表面涂油 8.下列关于火灾、灭火与逃生的说法,正确的是( )A .燃烧是一种缓慢的氧化反应B .着火时,只能用水灭火C .高楼发生火灾,可以跳楼逃生D .用湿毛巾捂住口鼻在火场的浓烟中爬行逃生9.化学是你,化学是我,化学深入我们的生活。
下列说法正确的是( )A .腌制的泡菜虽然含亚硝酸盐,但多吃无妨B .焊接金属时常用氧气作保护气C .铵态氮肥与熟石灰混合使用可以明显提高肥效D .回收各种废弃塑料,能有效解决“白色污染”问题10.制造导弹的合金材料的重要元素钕的某些信息如图所示,下列有关钕的说法错误的是( )A .原子序数为60B .属于金属元素C .相对原子质量为144.2 gD .核内质子数为6011.诺贝尔奖获得者屠呦呦发现的青蒿素,化学式为15225C H O ,下列有关青蒿素的说法错误的是( )A .青蒿素是一种氧化物B .青蒿素由碳、氢、氧三种元素组成C .每个青蒿素分子中含有42个原子D .青蒿素中碳元素的质量分数最大 12.下列实验现象描述正确的是( )A .硫在空气中燃烧发出明亮的蓝紫色火焰B .电解水的实验中,负极产生的气体能使带火星的木条复燃C .黄铜片和铜片相互刻划,只有铜片上有划痕D .生石灰中加入一定体积的水,白色固体变成白色浆液,吸收大量的热13.4LiFePO 新型锂离子电池以其独特的优势成为绿色能源的新宠,已知Li 的化合价为+1价,P 为+5价,则4LiFePO 中Fe 的化合价是( ) A .+2B .0C .+3D .+614.下列广告词对应商品的主要成分及类别错误的是-------------在--------------------此--------------------卷--------------------上--------------------答--------------------题--------------------无--------------------效----------------毕业学校_____________ 姓名________________ 考生号________________ ________________ ___________化学试卷 第3页(共10页) 化学试卷 第4页(共10页)( )15.下列实验操作正确的是( )A .实验结束后,剩余的药品放回了原瓶B .将pH 试纸伸入碳酸钾溶液中测pHC .用100 mL 量筒量取98.0 mL 水D .用排水法收集氧气时,看到水槽内导管口有气泡冒出立即收集 16.下列关于化学的应用和记载,对其说明错误的是( )A .沈卢用“以剂钢为刃,柔铁为茎干”来描述古剑的制作,这里的剂钢指铁的合金B .《神农本草经》记载有“水银……镕化(加热)还复为丹”,其中水银指金属银C .我国古代人民常用明矾水(明矾水溶液显酸性)除去铜器上的铜锈223Cu OH [)CO (]D .《梦溪笔谈》记载有“熬胆矾铁釜,久之亦化为铜”,该过程发生了置换反应 17.地壳中含量最多的金属元素、非金属元素和空气中含量最多的元素组成的化合物是( )A .33Al(NO )B .3CaCOC .243Al SO ()D .33Fe(NO ) 18.下列措施有利于生态文明建设的是( )①研发易降解生物化肥 ②限制生产含磷的洗衣粉③田间焚烧秸秆 ④应用高效洁净的能源转化技术⑤加快化石燃料的开采与使用A .①③⑤B .①②④C .②③⑤D .②④⑤ 19.下列叙述正确的是( )A .长期放置后不会分层的液体一定是溶液B .在沉淀、吸附、过滤、消毒、蒸馏等净水过程中,消毒净化程度最高C .稀释浓硫酸时,一定要把浓硫酸沿着器壁慢慢注入水里,并不断搅拌D .人体摄入锌不足会引起多种疾病,所以应该大量服用补锌的保健品20.下列物质的鉴别方法错误的是 ( )A .灼烧法鉴别棉花和羊毛B .观察颜色鉴别2FeCl 溶液和3FeCl 溶液C.肥皂水鉴别硬水和软水 D .白醋鉴别苏打和小苏打21.下列图象与选项中的表述相对应,其中合理的是( )ABCDA .恒温条件下,将足量的饱和硝酸钾溶液蒸发一定质量的水B .煅烧一定质量的石灰石C .一定质量的高锰酸钾受热过程中产生氧气的体积随时间的变化D .熟石灰的溶解度与温度的关系22.下列物质之间的转化,经过一步反应不能实现的是( )A .2CuCl KCl −−→B .324KNO K SO −−→C .3243Fe OH F ))e ((SO −−→D .23BaCl BaCO −−→ 23.除去下列各物质中混有的少量杂质,所用的试剂或操作方法不合理的是( )24.下列推理正确的是( )A .离子是带电的粒子,所以带电的粒子一定是离子B .酸中一定含有氢元素,所以含有氢元素的物质一定是酸C .可燃物燃烧时温度需要达到着火点,所以可燃物温度达到着火点就能燃烧D.金刚石和石墨都是由碳元素组成的单质,所以它们的化学性质相似25.把一定质量的甲、乙、丙、丁四种物质放入一密闭容器中,在一定条件下反应一段时间,测得反应后各物质的质量如下表,则下列说法中错误的是A.X=0.4B.丁一定是单质C.甲和乙是反应物D.反应中的甲、丙发生改变的质量比是11:14二、填空题(本题共3小题,共13分)26.(4分)结合下面的四瓶溶液示意图,回答问题:(1)写出③号瓶溶液中溶质的俗名:。
精品解析:2024年甘肃省兰州市中考一模数学模拟试题(原卷版)
2024年兰州市九年级诊断考试数学注意事项:1.全卷共120分,考试时间120分钟.2.考生必须将姓名、准考证号、考场号、座位号等个人信息填(涂)写在答题卡上.3.考生务必将答案直接填(涂)写在答题卡的相应位置上.一、选择题:本大题共12小题,每小题3分,共36分.在每小题给出的四个选项中,只有一项是符合题目要求的.1. 以下是2023年中国国际汉字文化创意设计大赛中,以“甘肃”“广东”为主题创作的作品,其中轴对称图形是( )A. B. C. D.2. 2023年10月26日,搭载神舟十七号载人飞船的长征二号F 遥十七运载火箭在酒泉卫星发射中心发射成功.火箭起飞质量约497000千克.数据497000用科学记数法表示为( )A. B. C. D. 3. 如图,已知,,则( )A. B. C. D. 4. 因式分解:( )A. B. C. D. 5. 一元二次方程的根的情况为( )A. 无实数根B. 有两个不相等的实数根C. 有两个相等的实数根D. 不能判定6. 实数a ,b 在数轴上的对应点如图所示,下列结论正确的是( )A. B.C. D. 60.49710⨯54.9710⨯44.9710⨯449.710⨯12∠=∠3118∠=︒4∠=48︒62︒68︒72︒24a -=()()44a a +-()()42a a +-()()24a a +-()()22a a +-2550x x -+=2a >-0a b +>a b <0b a ->7. 如图,在数学实践课上,老师要求学生在一张纸(矩形)上剪出一个面积为的等边三角形.某小组分析后,先作了,再算出了的长,然后分别在,上截取了,则的长为( )A. B. C. D. 8. 在一定温度范围内,声音在空气中的传播速度v (m/s )可看作是温度t (℃)的一次函数,根据下表数据,则v 与t 的函数表达式为( )温度…0102030…传播速度…324330336342348…A. B. C. D. 9. 兰州市现行城镇居民用水量划分为三级,水价分级递增.第一级为每户每年不超过144m 的用水量,执行现行居民用水价格;第二级为超出144m 但不超过180m 的用水量,执行现行居民用水价格的1.5倍;第三级为超出180m 的用水量,执行现行居民用水价格的3倍.某小区志愿队为了解该小区居民的用水情况,随机抽样调查了50户家庭的年用水量,并整理绘制了频数直方图(如图),若该小区共有1000户居民,请根据相关信息估计该小区年用水量达到第三级标准的户数( )A. 30B. 45C. 60D. 9010. 《九章算术》中记载了这样一个问题:今有上禾三秉,益实六斗,当下禾十秉.下禾五秉,益实一斗,当上禾二秉.问上、下禾实一秉各几何?大意是:3束上等禾的产量再加6斗,相当于10束下等禾的产量;5束下等禾的产量再加1斗,相当于2束上等禾的产量.问上等禾、下等禾每束的产量各为几斗?设上等禾每束产量x 斗,下等禾每束产量y斗,根据题意可列方程组为( )4AABCD 3AEF 60MAB ∠=︒AF AM AB AE AF =AF 10cm 20cm()t ℃10-()m/s v 6330v t =+6330v t =-+0.6330v t =+0.6330v t =-+3333A. B. C. D. 11. 把直尺、圆片和两个同样大小的含30°角的直角三角尺按图所示放置,两三角尺的斜边与圆分别相切于点B ,C .若,则( )A. B. C. D. 12. 如图,在钝角中(为钝角),,,,在其内部作一个矩形,使矩形的一边在边上,顶点M ,P 分别在边,上.设矩形的一边,矩形的面积为y ,则y 与x 的函数关系式可用函数图象表示为( )A. B. C. D.二、填空题:本大题共4小题,每小题3分,共12分.13. 若x有意义,则______(写出1个即可).14. 自然界绝大多数的彩色光都可以利用红、绿、蓝三种色光按不同比例混合而成,这叫做三原色原理,如:红光与绿光重叠现黄色.如图所示,小明制作了两个可以自由转动的转盘,每个转盘被分成面积相等的扇形,同时转动两个转盘,根据三原色原理配得黄色的概率为______.15. 如图,在平面直角坐标系中,和是以原点O 为位似中心的位似图形,,已3610512x y y x +=⎧⎨+=⎩3610512x y x y +=⎧⎨+=⎩3610512x y y x -=⎧⎨-=⎩1036251x y y x =+⎧⎨=+⎩3AB = BC=π 1.5πABC BAC ∠45B ∠=︒AB =10AC =MNQP NQ BC AB AC MN x =x =ABC A B C ''' 12AB A B ''=知,则顶点的坐标为______.16. 如图,在矩形中,,,点E 为的中点,与相交于点P ,则线段______.三、解答题:本大题共12小题,共72分.解答时写出必要的文字说明、证明过程或演算步骤.17. 解不等式组:.18.解方程:.19. 先化简,再求值:,其中,.20. 如图,一次函数的图象与反比例函数的图象交于点,与x 轴交于点B .(1)求反比例函数与一次函数的表达式:(2)过点A 作轴于点C ,求的面积.21. 甘肃省公用品牌“甘味”中的区域品牌“兰州百合”荣登农业产业品牌百强榜.甘肃某地区为深入推进乡村振兴产业发展,采购了A ,B 两种型号包装机同时包装百合,某质检部门从已包装好的产品中随机()1,2A A 'ABCD 4AB =6BC =BC AE BD AP =()71131211x x x x ⎧+>+⎨-<+⎩()31131x x x =-++()()2422312x x y x x +-++15x =5y =-y x b =+()0k y x x=>()1,3A k y x=y x b =+AC x ⊥ABC各抽取10袋测得实际质量(单位:),规定质量在为合格产品.将所得数据进行收集整理,部分信息如下:信息一:A ,B 型号包装机包装的每袋百合质量的折线统计图信息二:A ,B 型号包装机包装的每袋百合质量的统计量型号统计量平均数中位数众数极差合格率A 型m 50811B 型5055058请根据以上信息,回答下列问题:(1)表格中______;(2)根据统计图来看,______型号包装机包装的百合的质量比较稳定:(填“A ”或“B”)(3)综合以上信息,你认为该地区应选择哪种型号包装机包装百合较为合适?并说明理由.22. 如图,在中,,与相切于点A ,与相交于点C ,延长交于点D ,连接.(1)求的大小;(2)当时,求的长.23. 数学家为解决“化圆为方”问题,将其转化为特殊的“化矩形为方”问题.化矩形为方指的是给定任意矩形,作出和这个矩形面积相等的正方形.g ()5005g ±504.830%504.860%m =AOB 30B ∠=︒O AB OB AO O CD D ∠2BC =CD如图,已知矩形.尺规作图完成“化矩形为正方形”问题.以下为作图过程:①以点B 为圆心,长为半径画弧,交延长线于点E ;②分别以点A ,E为圆心,大于的长为半径画弧,两弧交于M ,N 两点,连接交于点F ,则点F 为的中点;③以点F 为圆心,长为半径画弧,交延长线于点P ;④以为边,在边右侧作正方形,即“化矩形为正方形”.(1)请按照作图过程中④的要求,用无刻度直尺和圆规将所给图形补充完整;(保留作图痕迹,不写作法)(2)根据已补充完整的图形解决问题:在矩形中,已知,,则______,______,进而求得正方形的边______.由此可得,即达到“化矩形为方”的目的.24. 小伟站在一个深为3米的泳池边,他看到泳池内有一块鹅卵石,据此他提出问题:鹅卵石的像到水面的距离是多少米?小伟利用光学知识和仪器测量数据解决问题,具体研究方案如下:问题鹅卵石的像到水面的距离工具纸、笔、计算器、测角仪等ABCD ABCD BPQR BC AB 12AE MN AE AE AF CB BP BP BPQR ABCD BPQR ABCD 5AB =1AD =BF =PF =BPQR BP =BPQR ABCD S S =正方形矩形图形说明根据实际问题画出示意图(如上图),鹅卵石在C 处,其像在G 处,泳池深,且,于点N ,于点B ,于点H ,点G 在上,A ,B ,G 三点共线,通过查阅资料获得.数据,.请你根据上述信息解决以下问题:(1)求的大小;(2)求鹅卵石的像G 到水面的距离.(结果精确到)(参考数据:,,)25. 如图1,从远处看兰州深安黄河大桥似张开的翅膀,宛如一只“蝴蝶”停留在黄河上,它采用叠合梁拱桥方案设计.深安黄河大桥主拱形呈抛物线状,从上垂下若干个吊杆,与桥面相连.如图2所示,建立平面直角坐标系,吊杆到原点O 的水平距离,吊杆到原点O 的水平距离,且,主拱形离桥面的距离与水平距离近似满足二次函数关系,其对称轴为直线.(1)求的长度:(2)求主拱形到桥面的最大高度的长.26. 如图,在矩形中,点,分别在,上.将矩形分别沿,翻折后点,均落在点处,此时,,三点共线,若.BN BN CH =MN NC ⊥MN BH ⊥CH BH ⊥CH sin 1.33sin ABM CBN ∠=∠3m BN =41.7ABM ∠=︒CBN ∠GH 0.1m sin 41.70.665︒≈cos 41.70.747︒≈tan 41.70.891︒≈ 1.73≈OAB CD 26m OC =EF 134m OE =CD EF =()m y ()m x ()20.006y x h k =--+x h =OH AH ABCD E F AD CD ABCD BE EF A D G B G F 2BG EG =(1)求证:矩形为正方形;(2)若,求的长.27. 综合与实践【问题情境】在数学综合实践课上,“希望小组”的同学们以三角形为背景,探究图形变化过程中几何问题.如图,在中,,,点D 为平面内一点(点A ,B ,D 三点不共线),为的中线.【初步尝试】(1)如图1,小林同学发现:延长至点M ,使得,连接.始终存在以下两个结论,请你在①,②中挑选一个进行证明:①;②;【类比探究】(2)如图2,将绕点A 顺时针旋转得到,连接.小斌同学沿着小林同学的思考进一步探究后发现:,请你帮他证明:【拓展延伸】(3)如图3,在(2)的条件下,王老师提出新的探究方向:点D 在以点A 为圆心,为半径的圆上运动(),直线与直线相交于点G ,连接,在点D 的运动过程中存在最大值.若,请直接写出的最大值.28. 在平面直角坐标系xOy 中,给出如下定义:对于图形W 和图形W 外一点P ,若在图形W 上存在点M ,N ,使,则称点P 是图形W 的一个“2倍关联点”.例如:如图1,已知图形W :,,,;点到上的点的最小距离为,到上的点的最大距离为,则.因此在上存在点M ,N ,使得,则点P 是的一个“2倍关联点”.ABCD 2DF =BC ABC AB AC =90BAC ∠=︒AE ABD △AE ME AE =DM DM AC =180MDA DAB ∠+∠=︒AD 90︒AF CF 12AE CF =AD AD AB >AE CF BG BG 4AB =BG 2PM PN =ABC ()0,2A ()1,0B -()1,0C ()0,1P -ABC 1PO =ABC 3PA =2PA PO >ABC 2PM PN =ABC(1)如图2,已知,.①判断点______线段AB 的一个“2倍关联点”;(填“是”或“不是”)②若点是线段AB 的“2倍关联点”,求m 的最小值;(2)如图3,圆心为原点,半径为1,若在直线l :上存在点Q 是的.“2倍关联点”,求b的取值范围.()0,1A ()2,1B ()12,1P -()21,P m O y x b =+O。
甘肃省兰州市九年级下学期语文中考学业水平模拟试卷
甘肃省兰州市九年级下学期语文中考学业水平模拟试卷姓名:________ 班级:________ 成绩:________一、语文积累与综合运用(35分) (共4题;共35分)1. (10分) (2019八上·东莞期中) 根据题示填空。
(1) ________,长河落日圆。
(王维《使至塞上》)(2)乱花渐欲迷人眼,________。
(《钱塘湖春行》)(3) ________,松柏有本性。
(刘贞《赠从弟》)(4)相顾无相识,________。
(王绩《野望》)(5)李白《渡荆门送别》中“________,________”两句用游动的视角来描写景物的变化。
(6)《黄鹤楼》中抒发诗人思乡之情的句子是“________,________。
”2. (9.0分) (2017八下·仙游月考) 根据要求,完成下列三题。
(1)选择下列划线注音完全正确的一项()A . 禁锢(gù)诘责(jí)文绉绉(zhōu)B . 胡髭(zī)黝黑(yǒu)一绺绺(lǚ)C . 解剖(pōu)畸形(qí)诱惑(yòu)D . 滞留(zhì)粲然(càn)庶祖母(shù)(2)下列成语中没有错别字的一项是()A . 器宇轩昂鹤立鸡群肖声匿迹B . 成群结队美其名曰文质彬彬C . 诚惶诚恐粗制乱造藏污纳诟D . 暗然失色不可名状美不胜收(3)请从备选事物中任选一个,参照示例,仿写一句话,句式不限。
【示例】阳光:午后的阳光穿枝拂叶而来,温柔地亲吻着我的脸庞。
【备选事物】月亮枯叶小溪事物:________仿写:________3. (4分) (2017七下·宁波期中) 根据一位同学阅读《海底两万里》等两部名著后写的读书笔记,请你按要求填空。
(1)【读书笔记一】情节概括下面情节中,出自《海底两万里》的有()A . 孤身斗舰队,奇招灭火灾B . 风暴中偏航,麦田里获救C . 遭冰山封路,陷缺氧危机D . 海底观美景,洋面见海难(2)【读书笔记二】人物点评下述点评中,点评尼摩船长正确的一项是()A . 他,知识渊博,机智勇敢,沉着果断。
甘肃省兰州市各地九年级下学期期末物理试卷精选汇编
甘肃省兰州市各地九年级下学期期末物理试卷精选汇编(考试时间:90分钟,满分:100分)一、选择题(每题2分,共30分)1. 关于力的概念,下列哪项描述是正确的?A. 力是物体运动的原因B. 力是改变物体运动状态的原因C. 力是维持物体运动状态的原因D. 力是物体间相互作用的结果2. 下列哪个物理量是矢量?A. 速度B. 质量C. 时间D. 温度3. 在自由落体运动中,物体的速度与时间的关系是?A. 速度与时间成正比B. 速度与时间成反比C. 速度与时间的平方成正比D. 速度与时间的平方成反比4. 下列哪个物理现象可以用惯性来解释?A. 投掷物体时,物体离开手后继续前进B. 跳高运动员跳过横杆后继续上升C. 汽车刹车后继续前进一段距离D. 地球绕太阳公转5. 下列哪个物理量是标量?A. 位移B. 速度C. 加速度D. 力6. 下列哪个物理现象可以用牛顿第一定律来解释?A. 地球绕太阳公转B. 汽车刹车后继续前进一段距离C. 投掷物体时,物体离开手后继续前进D. 跳高运动员跳过横杆后继续上升7. 下列哪个物理量是表示物体运动快慢的?A. 位移B. 速度C. 加速度D. 力二、判断题(每题1分,共20分)1. 力是物体运动的原因。
()2. 力是改变物体运动状态的原因。
()3. 力是维持物体运动状态的原因。
()4. 力是物体间相互作用的结果。
()5. 速度是矢量。
()6. 质量是矢量。
()7. 时间是矢量。
()8. 温度是矢量。
()9. 在自由落体运动中,物体的速度与时间成正比。
()10. 在自由落体运动中,物体的速度与时间成反比。
()11. 在自由落体运动中,物体的速度与时间的平方成正比。
()12. 在自由落体运动中,物体的速度与时间的平方成反比。
()13. 投掷物体时,物体离开手后继续前进可以用惯性来解释。
()14. 跳高运动员跳过横杆后继续上升可以用惯性来解释。
()15. 汽车刹车后继续前进一段距离可以用惯性来解释。
初三毕业考试全真试卷九年级期末试题检测复习资料下载甘肃省中考数学试卷
数学试卷 第1页(共10页) 数学试卷 第2页(共10页)绝密★启用前甘肃省初中毕业生学业考试数 学本试卷满分150分,考试时间120分钟.第Ⅰ卷(选择题 共60分)一、选择题(本大题共15小题,每小题4分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的) 1.在下列绿色食品、循环回收、节能、节水的四个标志中,属于轴对称图形的是 ()A B C D2.下列说法中错误的是( )A .掷一枚均匀的骰子,骰子停止转动后6点朝上是必然事件B .了解一批电视机的使用寿命,适合用抽样调查的方式C .若a 为实数,则||0a <是不可能事件D .甲、乙两人各进行10次射击,两人射击成绩的方差分别为22s =甲,2=4s 乙,则甲的射击成绩更稳定 3.函数y ,自变量x 的取值范围是( )A .2x ->B .2x -≥C .2x ≠-D .2x -≤4.期中考试后,班里有两位同学议论他们所在小组同学的数学成绩,小明说:“我们组成绩是86分的同学最多”,小英说:“我们组的7位同学成绩排在最中间的恰好也是86分”.上面两位同学的话能反映出的统计量是 ( ) A .众数和平均数 B .平均数和中位数C .众数和方差D .众数和中位数5.如图,在Rt ABC △中,90C ∠=,3BC =,4AC =,那么cos A 的值等于 ( ) A .34B .43C .35D .456.抛物线2(1)3y x =--的对称轴是( )A .y 轴B .直线1x =-C .直线1x =D .直线3x =- 7.下列命题中正确的是( )A .有一组邻边相等的四边形是菱形B .有一个角是直角的平行四边形是矩形C .对角线垂直的平行四边形是正方形D .一组对边平行的四边形是平行四边形8.两圆的半径分别为2cm ,3cm ,圆心距为2cm ,则这两个圆的位置关系是 ()毕业学校_____________ 姓名________________ 考生号________________ ________________ _____________-------------在--------------------此--------------------卷--------------------上--------------------答--------------------题--------------------无--------------------效----------------数学试卷 第3页(共10页) 数学试卷 第4页(共10页)A .外切B .相交C .内切D .内含9.若反比例函数1k y x-=的图象位于第二、四象限,则k 的取值可能是 ( )A .0B .2C .3D .410.一元二次方程20(0)a x b xc a ++=≠有两个不相等的实数根.下列选项中正确的是 ( )A .240b ac -= B .240b ac ->C .240bac -< D .240b ac -≥11.把抛物线22y x =-先向右平移1个单位长度,再向上平移2个单位长度后,所得函数的表达式为 ( ) A .22(1)2y x =-++ B .22(1)2y x =-+-C .22(1)2y x =--+D .22(1)2y x =---12.如图,在ABC △中,90ACB ∠=,30ABC ∠=,2AB =.将ABC △绕直角顶点C 逆时针旋转60得A B C ''△,则点B 转过的路径长为( )A .π3BC .2π3D .π13.如图,CD 是O 的直径,弦AB CD ⊥于点E ,连接BC,BD .下列结论中不一定正确的是( )A .AE BE =B .AD BD =C .OE DE =D .90DBC ∠=14.二次函数2(0)y ax bx c a =++≠的图象如图所示,其对称轴为1x =,下列结论中错误的是 ( ) A .0abc < B .20a b += C .240b ac -> D .0a b c -+>15.如图,在平面直角坐标系中,四边形OBCD 是边长为4的正方形.平行于对角线BD 的直线l 从O 出发,沿x 轴正方向以每秒1个单位长度的速度运动,运动到直线l 与正方形没有交点为止.设直线l 扫过正方形OBCD 的面积为S,直线l 运动的时间为t (秒).下列能反映S 与t 之间函数关系的图象是( )AB CD数学试卷 第5页(共10页) 数学试卷 第6页(共10页)第Ⅱ卷(非选择题 共90分)二、填空题(本大题共5小题,每小题4分,共20分.请把答案填在题中的横线上) 16.在四个完全相同的小球上分别写上1,2,3,4四个数字,然后装入一个不透明的口袋内搅匀.从口袋内任取出一个球记下数字后作为点P 的横坐标x ,放回袋中搅匀,然后再从袋中取出一个球记下数字后作为点P 的纵坐标y ,则点(,)P x y 落在直线5y x =-+上的概率是 . 17.如果菱形的两条对角线的长为a 和b ,且a ,b 满足2(1)0a -=,那么菱形的面积等于.18.如图,ABC △为O 的内接三角形,AB 为O 的直径,点D 在O 上,54ADC ∠=,则BAC ∠的度数等于.19.如图,在一块长为22米、宽为17米的矩形地面上,要修建同样宽的两条互相垂直的道路(两条道路分别与矩形的一条边平行),剩余部分种上草坪,使草坪面积为300平方米.设道路宽为x 米,根据题意可列出方程为.20.为了求2310012222++++⋅⋅⋅+的值.可令2310012222S =++++⋅⋅⋅+,则2S =23410122222++++⋅⋅⋅+,因此101221S S -=-,所以10121S =-,即12++2310010122221++⋅⋅⋅+=-.仿照以上推理计算23201413333++++⋅⋅⋅+的值是 .三、解答题(本大题共8小题,共70分.解答应写出必要的文字说明、证明过程或演算步骤) 21.(本小题满分10分,每小题5分) (1)计算:20(1)2cos303(2014)--+-;(2)当x 为何值时,代数式2x x -的值等于1.22.(本小题满分5分)如图,在ABC △中,先作BAC ∠的角平分线AD 交BC 于点D ;再以AC 边上的一点O 为圆心,过A ,D 两点作O .(用尺规作图,不写作法,保留作图痕迹,并把作图痕迹用黑色签字笔加黑)数学试卷 第7页(共10页) 数学试卷 第8页(共10页)23.(本小题满分6分)兰州市某中学对本校初中学生完成家庭作业的时间做了总量控制,规定每天完成家庭作业的时间不超过1.5小时.该校数学课外兴趣小组对本校初中学生回家完成作业的时间做了一次随机抽样调查,并绘制出频数分布表(如图1)和频数分布直方图(如图2)的一部分.图1 图2(1)在图1中,a = ,b = ; (2)补全频数分布直方图;(3)请估计该校1 400名初中学生中,约有多少学生在1.5小时以内完成了家庭作业.24.(本小题满分8分)如图,在电线杆上的C 处引拉线CE ,CF 固定电线杆.拉线CE 和地面成60角,在离电线杆6米处安置测角仪AB ,在A处测得电线杆上C 处的仰角为30.已知测角仪AB 的高为1.5米,求拉线CE 的长(结果保留根号).25.(本小题满分9分)如图,直线y mx =与双曲线k y x=相交于A ,B 两点,A 点的坐标为(1,2).(1)求反比例函数的表达式;(2)根据图象直接写出当k mx x>时,x 的取值范围;(3)计算线段AB 的长.26.(本小题满分10分) 如图,AB 是O 的直径,点E 是AD 上的一点,DBC BED ∠=∠.(1)求证:BC 是O 的切线;(2)已知3AD =,2CD =,求BC 的长.数学试卷 第9页(共10页) 数学试卷 第10页(共10页)27.(本小题满分10分)给出定义:若一个四边形中存在相邻两边的平方和等于一条对角线的平方,则称该四边形为勾股四边形. (1)在你学过的特殊四边形中,写出两种勾股四边形的名称;(2)如图,将ABC △绕顶点B 按顺时针方向旋转60得到DBE △,连接AD ,DC ,CE .已知30DCB ∠=.①求证:BCE △是等边三角形; ②求证:222DCBC AC +=,即四边形ABCD 是勾股四边形.28.(本小题满分12分)如图,抛物线212y x mx n =-++与x 轴交于A ,B 两点,与y 轴交于点C ,抛物线的对称轴交x 轴于点D .已知(1,0)A -,(0,2)C . (1)求抛物线的表达式;(2)在抛物线的对称轴上是否存在点P ,使PCD △是以CD 为腰的等腰三角形.如果存在,直接写出P 点的坐标;如果不存在,请说明理由;(3)点E 是线段BC 上的一个动点,过点E 作x 轴的垂线与抛物线相交于点F ,当点E 运动到什么位置时,四边形CDBF 的面积最大?求出四边形CDBF 的最大面积及此时E点的坐标.。
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此 D.对角线相等的四边形是矩形
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一、选择题(本大题共 15 小题,每小题 4 分,共 60 分.在每小题给出的四个选项中,只有 x
在 甘肃省兰州市 2015 年初中毕业生学业考试 C. ( 4x ) 1 7 2 D. ( 4x ) 1 5 2
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7.下列命题错误的是 ( )
1.下列函数解析式中,一定为二次函数的是 ( )
卷 A. yx31 B. y a x b x c2
-------------------- 第Ⅰ卷(选择题 共 60 分)
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8.在同一直角坐标系中,一次函数 y k x k 与反比例函数 yk( 0 ) 的图象大致是
数 学 A.对角线互相垂直平分的四边形是菱形
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B.平行四边形的对角线互相平分
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绝密★启用前 6 xx 8 1 0