寒假作业二2
人教版 地理 必修二 第一章 人口的变化 寒假作业(二)(含答案)
绝密★启用前人教版地理必修二第一章人口的变化寒假作业(二)本试卷分第Ⅰ卷和第Ⅱ卷两部分,共100分分卷I一、单选题(共10小题,每小题4.0分,共40分)生育率是指一定年龄内平均每千名育龄妇女所生孩子数。
下图是“我国不同年代生育率分布的盒形图”,盒内的分隔线为中位数,线段向上至最大值,向下至最小值。
据此回答1题。
1.影响我国生育率变化特点的主要原因是()A.生育观念B.人口受教育水平C.人口老龄化D.国家人口政策下图是人口增长模式简略示意图,读图回答2题。
2.关于阶段②的说法,正确的是()A.属于高-低-高模式B.世代更替慢,人口增长慢C.人口老龄化趋势明显D.经常面临劳动力不足状况下图所示的西伯利亚地区是俄罗斯的一个重要开发区,这里针叶林广布……回答3题。
3.20世纪后期以来,该地区内部呈现人口由南向北的迁移趋势,这主要是由于北部()A.人口密度低B.开发了新资源C.交通条件改善D.市场广阔下图示意经济发展程度与人口迁移数量的关系(曲线分别表示乡村之间、城市之间、乡村到城市、城市到乡村四种人口迁移类型)。
读图完成4题。
4.我国目前人口迁移的主要方式为()A.①B.②C.③D.④木桶效应原理即组成木捅的木板如果长短不齐,木捅的盛水量取决于最短的那一块木板。
回答5题。
5.某地以耕地、森林、淡水、矿产测得的各自所能供养的人口数量分别为8 000、6 000、4 500、10 000,则该地的环境承载力取决于()A.耕地B.森林C.淡水D.矿产6.甲图表示某国人口增长模式转变过程示意图,乙图为该国某城市人口的年龄、性别结构示意图。
读图完成6题。
关于该国人口自然增长的叙述,正确的是()A.该国人口增长模式转变过程是N—P—MB. P时期劳动力不足C. M时期人口自然增长特点是高出生率,低死亡率,低自然增长率D. N点时人口数量达最大值下图为“某国1940-2013年人口自然增长率变化情况图”。
读图并结合所学知识,回答7题。
初一英语寒假作业2
初一英语寒假作业(二)一、完形填空One day a rich man met Tom. The rich man asked, “I hear you are very clever and 1. ________ is difficult for you. Can you tell me why you are so clever?”Tom answered with 2. __________. “ I’m not clever, instead, you are too foolish (愚蠢的).” The rich man became 3. __________.Tom said, “Sir, please 4.__________ unhappy, if you don't agree with 5. __________ I said, let me 6. __________ you a very easy question—If you have a group of sheep, I send you 7. __________ group. Then, how many groups of sheep do you have?” “Why, that's the easiest question in the world. One and?one is two, 8. _______knows it, I have two groups of sheep, of course.”Tom laughed and laughed, “You are quite 9. __________, sir. Putting two groups together, it is still one group. That's the 10. _________ question in the world, isn't it?”( ) 1. A. something B. anything C. nothing D. everything ( ) 2. A. smile B. smiles C. smiling D. a smile( ) 3. A. happy B. sad C. unhappy D. sorry( ) 4. A. don't B. don't be C. not D. isn't( ) 5. A.what B. which C. how D. who( ) 6. A. say B. speak C. ask D. tell( ) 7. A. other B. the other C. one D. another( ) 8. A. People B. Anybody C. Somebody D. Nobody( ) 9. A. right B. wrong C. difficult D. clever( )10. A. more difficult B. easier C. most difficult D. easiest二.阅读理解(A)In India, there was a town called Boring. The people there never laughed. They didn't know how to laugh. The children there didn't play in the day. In the evening, they didn't watch TV. All they wanted was marks, marks and more marks. Life wasreally boring for them.One day, an old Grandma came to the town. It was her first time to visit herEkta wasn't happy. She only thought about her history marks.Grandma wanted to find some ways to make the town interesting. She took the children out of the school and taught them to play games. She also asked the children to show their happiness by laughing. Later, the children knew that life wasn't only about marks.( ) 1. What did the children probably do in the evening?A. They played with each other.B. They watched TV.C. They played computer games.D. They did their homework.( ) 2. What did Grandma teach the children to do?A. To play games.B. To study happily.C. To study well.D. To read more books.( ) 3. Which of the following is TRUE according to the text?A. Ekta was a visitor to Boring.B. Ekta didn't like to study history.C. Gajar ka halwa is a kind of dessert.D. Life was interesting for the peoplein Boring.( ) 4. The text tells us that.A. studying should come firstB. life isn't only about marksC. children should laugh every dayD. playing games is good forchildren(B)We all know that cola is bad for our health. It is sweet because it has too much sugar in it. Too much sugar can let you get fat. Drinking one bottle of cola each day can make you put on fifteen pounds each year. And because the sugar in cola can makeAnd cola is bad for your teeth and bones.So fewer people drink cola now. But energy drinks(运动饮料)become more andmore popular.Energy drinks look cool. Their makers say they give you energy and make you better at sports. So, many students drink them before exams to help them stay awake. But in fact, it has a lot of caffeine. If you drink a lot of them, your heart will beat faster. You will feel uncomfortable. The energy you get from the drinks helps for only a short time. You may feel good for an hour or so, but then you'll feel worse than before.( ) 5. The underlined phrase "put on" in the second line is very close to “”.A. loseB. getC. takeD. put( ) 6. According to the passage, we'll if we drink much cola.A. feel fullB. do better at sportsC. eat less healthy foodD. bothA&C( ) 7. Many students drink energy drinks before exams because it can.A. make you better at sportsB. make them comfortableC. help their hearts beat fasterD. help them stay awake( ) 8. From the passage, we know that.A.energy drinks has caffeineB. Cola is bad for your feet and bonesC. you'll feel comfortable if your heart beats fasterD. you’ll feel worse if you drink cola(C)Now I'm in my second year at art schoolfuture. I have big plans and I ' d like to tell you a little about them.My first plan is about my holiday. I am going to visit my brother, who is working in Malaysia. My parents and I are going to spend Thanksgiving with him. I am very excited about it.When I come back, I need to make a final decision about which course I amgoing to study next year. I am still not suregardens. If I choose gardening, I'd like to work with my friend, Jasper. He is talentedin gardens and we worked together before. In fact, it was great fun and we got on withIn five or ten years' time I would like to have my own business(生意)and work for myself like my father. He has his own building business. I'll probably take a business course after I finish art school.Besides, I hope to marry and have children before I'm 30, but I can't plan when I'll meet the right person and I don't have a boyfriend now.In my dreams I see myself at 40 running a successful gardening company. I'll design beautiful gardens for beautiful people. I'll have a beautiful house with a swimming pool, two beautiful children, and of course a husband who is as successful as I am. Who knows, it could even be Jasper.( ) 9. What is this passage mainly about?A. The writer's dream.B. The writer's family.C. The writer's School.D. The writer's experience.( ) 10. Where is the writer's brother now?A. In Russia.B. In Canada.C. In Japan.D. In Malaysia. ( ) 11. What does the underlined word " It " refer to in Paragraph 3 ?A. Having her own business and working for herself.B. Studying both clothes design and garden design.C. Choosing one from clothes design and garden design.D. Thinking of a new way to design clothes and garden.( ) 12. Which of the following is TRUE?A. The writer already has a boyfriend named Jasper.B. The writer thinks it is enjoyable to work with Jasper.C. The writer expects to have children when she is forty.D. The writer hopes to work for her father in the future.(D)We throw away rubbish almost every day. Do you know where it goes?Most of it goes into the sea. There are five large rubbish patches(垃圾带)in the sea. The largest one is the Great Pacific Rubbish Patch. Scientists are saying that the patch isgetting even bigger than before.The patch is in the Pacific Ocean between California and Hawaii. It is quite large. According to LiveScience, it has an area of l.6 million square kilometers. That is about 100 times bigger than Beijing.Most of the rubbish is plastic(塑料), including bottles, bags and fishing nets. According to Fox News, there are about 79, 000 tons (吨)of plastic in the patch. That's about 250 pieces of plastic for every person on Earth. Is one of those pieces from you?This plastic can harm sea animals and pollute the water. Scientists are trying different ways to clean up rubbish in the sea. But the most important thingis to stop rubbish from going into the sea in the first place.Where is sea rubbish from?●People throw their rubbish directly (直接地)into the ocean.●Wind can blow rubbish into the ocean.●Rain can wash the rubbish into river. Then, the rivers carry the rubbish to theocean.( ) 13. What does the underlined word "pollute" mean in Chinese in the fourth paragraph?A. 污染B.受伤C.分解D. 危害( ) 14. From Paragraph 1, we can learn that.A. throwing rubbish into the sea is the best way to get rid of (处理)it.B. there are six large rubbish patches in the sea.C. the largest rubbish patch is in the Pacific Ocean.D. the Pacific Ocean is getting bigger and bigger.( ) 15. Which of the following is NOT true about the Great Pacific Rubbish Patch?A. It has an area of l. 6 million square kilometers.B. It is 100 times larger than Beijing.C. It contains about 79, 000 tons of plastic.D. It receives 250 new pieces of plastic every day.( ) 16. Why should we stop throwing rubbish into the sea in Paragraph 4?a. It pollutes the water.b. It is bad for sea animals.c. It is difficult to clean up.d. We can't reuse rubbish if it is in the sea.A. abcB. abdC. acdD. bcd三.词汇应用1.﹣What are your favorite _________________(动物)?2._______ ________(起先),he felt sad, but later he was much better.3.The Great Wall is one of the _________________ (标志) of China.4.The _________________ (漂亮的) girl is crying.5.Every year people(砍断) many trees.6.Elephants are in great _________________ (危险).7.This table is_________________ (制成) of good wood.8.We should _________________ (睡) for 8 hours a day.9._________________ (考拉) are my favorite animals.10.Thanks for _______________(拯救) my life.11.When winter comes, some birds fly to the ______________ (南方).12.He spent his holiday in _________________ (泰国) last year.place, friend, forget, kill, lose13. He is very _________________ to others, so he has many friends there.14. If you want to visit the city, you'd better take a map, or you can get ___________.15. Mary always ________ to lock (锁上)the door when she leaves the classroom.16. I can remember the _____________ with a lot of cute animals.17. The boy loves dogs so he doesn't want people ________ them for their meat.四.语法填空When a small boy and his father 1.___________(walk)in the countryside, it suddenly began to rain动词2. _____________(heavy). They didn't have umbrellas 3. _____________ them and there was no place to hide,4.______________they were wet soon.The small boy felt sad. While they were walking home through the rain, the boy 5. _____________(think). Then 6.___________last,he turned to his father and asked, “Why does it rain,Father? It is not very nice,7. ______________ (be)it?” “No,it isn't very nice,but it's very 8.___________(use),” said his father. “It rains 9. ____________(make)the fruit and vegetables grow for us.” The boy thought about this for a moment and then said, “Then, 10. ______________does it rain on the road too, Father?”五.任务型阅读五位学生有各自想去的学校,下面是学校的简介,请为五位学生选择一个合适的学校。
福建省永县高一历史寒假练习2(无答案) (2)
2016永春一中高一年寒假作业二一、选择题1.《诗经》说:“大邦维屏,大宗维翰(栋梁),怀德维宁,宗子维城。
”这则材料最能说明西周 ( )A.实行分封制巩固统治 B.实行宗法制维护政治体系C.分封制与宗法制并行 D.通过宗法制实现权力集中2.春秋时期,秦国有“伐邦、冀戎,初县之”“初县杜、郑”;晋国有“克敌者,上大夫受县,下大夫受郡”等资料。
这说明( )A.郡县设置与军事有关 B.郡的地位远远高于县C.郡和县的设置在各国推广 D.分封制已退出历史舞台3.《汉书·诸侯王表》载,武帝时作“左官之律”。
注曰:“汉时依上古法,朝廷之列以右为尊,故谓降为左迁。
仕于诸侯为左官也。
”官吏违反规定私自到诸侯国任职,构成左官罪;左官犯罪,加重处罪。
这一规定实质上反映了( )A.汉朝初年实行郡国并行制度 B.汉代存在严格的尊君抑臣等级思想C.武帝意在防止诸侯王网罗人才D.汉代中央集权的加强4.据史料记载,汉武帝在位的54年中,共有13位丞相先后当政,其中3人被迫自杀,3人最终被杀,只有7人得到善终。
对上述现象解读不正确的是( )A.汉武帝时代中国已走向极端专制B.君主专制体制下,臣民的生杀大权操纵在皇帝手中C.汉武帝频繁换相的主要目的是加强皇权D.伴君如伴虎,在皇帝身边的人常常面临危险5.有网友发表帖子讨论科举制时说:“科举兴于世,始以八股为试,学子彻夜秉读。
然科举追求功禄,令学子神经麻木,岂真学识耶?”对该帖最恰当的评价是( )A.对科举制的评价是完全正确的B.仅从追求功禄评价科举制是片面的C.关于科举制的史实和评价都有问题D.关于科举制和八股取士产生的时间都有错误6.“内阁制度始终没有突破它发展中遇到的瓶颈,即始终没有使明朝实现真正的‘虚君政治’。
”材料意在揭示()A.内阁制未改变明朝皇权专制的本质B.内阁官员权力弱小,无法助理国政C.明朝皇帝与内阁间的矛盾日益激化D.内阁内部争权夺利,无法发挥效用7.公元前1世纪,古罗马大将凯撒进兵埃及,与美丽的埃及女王克里奥佩特拉相爱,并且两人有了一个儿子,取名托勒密·凯撒。
福建省莆田第十五中学2018-2019学年高二上学期寒假作业(二)生物(理)试题
莆田十五中高二理科生物寒假作业2《人体的内环境与稳态》班级学生座号一、单项选择题:60分,每小题2分)1.对内环境的论述正确的是()A.内环境是指体液 B内环境由组织液、血浆和消化液组成C.内环境是指细胞内液 D.内环境是指细胞外液2.下列物质中,不属于人体内环境组成成分的是()A.钙离子B.呼吸酶C.葡萄糖D.血浆蛋白3.有关人体内环境稳态的叙述,错误的是()A.有3种以上的生理系统参与维持内环境稳态B.人体内环境稳态的失调与外界环境无关C.人体维持内环境稳态的调节能力有限D.稳态有利于参与其调节的器官保持机能正常4.下列属于内环境稳态的重要组成部分的是()①酸碱平衡②Na+、K+平衡③血糖平衡④体温调节⑤蛋白质平衡⑥CO2—O2平衡A.③B.①③④C.①②③④D.①②③④⑤⑥5.下列有关内环境稳态的叙述中正确的是()A.内环境稳态主要是机体通过各个器官、系统的协调来维持的B.内环境稳态是机体在神经系统的调节下,通过各个器官、系统的协调活动来维持的C.在正常情况下,内环境的各项理化性质是保持不变的D.在正常情况下,内环境的各项理化性质是经常处于变动之中的,但都要保持在适宜范围内6.内环境稳态的生理意义是()A.使体温维持相对恒定B.使体液的PH保持相对稳定C.使内环境的渗透压处于相对平衡D.是机体进行正常生命活动的必要条件7.血细胞、淋巴管壁细胞及毛细血管壁细胞的生活环境分别是()A.血浆、淋巴、组织液和血浆B.血浆、淋巴和组织液、组织液C.血浆、淋巴和组织液、组织液和血浆D.血浆、组织液、组织液8.血浆、组织液、淋巴三者关系中,叙述错误..的是()A、血浆中某些物质能透过毛细血管壁形成组织液B、组织液与血浆之间可以扩散与渗透C、一些组织液可渗入毛细淋巴管形成淋巴D、淋巴与组织液可以相互扩散与渗透9.哺乳动物肌肉细胞之间进行物质交换的环境是()A.血液B.体液C.组织液D.细胞内液10.人体内细胞外液构成的液体环境称为内环境,内环境的稳态是细胞生活所必需的。
八年级寒假作业二: Unit 2 检测题(无答案) 人教新目标版
辽宁省凌海市石山初级中学八年级英语上册寒假作业二 Unit 2 检测题(无答案)人教新目标版一.选择题.( ) 1.What’s the matter ____ you?—My back hurts.A. withB. forC. atD. on( ) 2. You should ____ more water when you have a fever.A. drinksB. drinkingC. drankD. have( ) 3. H e’s ill. He must go to ____ a doctor in the hospital.A. lookB. watchC. seeD. visited( ) 4. How are you? ---I’m feeling ______.A. goodB. wellC. betterD. fu( ) 5. There is a pen _____ on the floor, whose is it?A. lieB. puttingC. lyingD. lieing( ) 6. _____ did the headache start? --- About two hours ago.A. WhenB. WhatC. whereD. How( ) 7. I can’t sleep, so I _____ listen to quiet music, and I ______ listen to exciting music.A. should; shouldB. should n’t; shouldn’tC. should; shouldn’tD. can; don’t( ) 8. It’s ____ to eat mooncakes on Zhong Qiujie in China.A. traditionB. traditionalC. awfulD. stressed out( ) 9. You are always angry, maybe you have____ “yang”.A. tooB. too manyC. much tooD. too much( ) 10.David ____ a stomachache. So he ____ eat anything 24 hours.A. has, shouldB. has , should’tC. have, shouldn’tD. has, shouldn’t ( ) 11.. Don’t be angry _____ that little boy.A. atB. aboutC. withD. to( ) 12 They found _____ very difficult _____ English well.A. it, learnB. it, to learnC. that, learnD. that, to learn ( ) 13. He wasn’t feeling well. He had to _____.A. stops workingB. stop workingC. stops to workD. stop to work( ) 14.This maths problem is so difficult that only ____students can work it out.A .a few B. few C. a little D .little( ) 15..Eating a _____diet to stay healthy.A. balanceB. balancingC. balancedD. to balance二用所给单词的适当形式填空。
2019年八年级英语上学期寒假作业练习二(新版)人教新目标版
新目标八年级英语上册寒假作业练习二一、重点单词1.家务劳动(n.)____________ 2.几乎不(adv.)________________3.从来;曾经(adv.)__________ 4.一次;曾经(adv.)__________5.两次;两倍(adv.)__________6.互联网(n.)_____________7.节目(n.)______________ 8.忙的;满的(adj.)_____________9.摆动;秋千(n.)____________ 10.大概;或许(adv.)_________11.最小;最少(adv.)____________ 12.咖啡(n.)____________13.健康(n.)_______________ 14.结果;后果(n.)___________15.百分之……(n.)_____________ 16.在线的(adj.)_____________17.电视节目;电视机(n.)__________ 18.虽然;尽管(conj.)________ 19.以;穿过(prep.)___________ 20.头脑;心智(n.)_________21.身体(n.)____________ 22.这样的;类似的(adj.)__________23.在一起(adv.)___________ 24.消失;死亡(v.) ________25.作者;作家(n.)____________ 26.牙科医生(n.)___________27.杂志;期刊(n.)______________ 28.然而;不过(adv.)____________ 29.比(prep.) ____________ 30.几乎;差不多(adv.)____________ 31.没有一个(pron.)________ 32.较少;较小(adv.)____________33.得分;点(n.)__________二、重点短语1.少于 ___________ 2.多于 _____________________3.例如;像……这样 _________4.垃圾食品 ___________5.至少_____________ 6.摇摆舞 _________________7.几乎从不___________ 8.问题的答案______________________9.在周末________________ 10.去购物________________11.一周三次__________________ 12.一月两次_______________13.去上网______________ 14.去看电影 ______________15.想要某人做某事 ____________ 16.对……有好处_______________________三、重点句子1.下周对我来说相当忙。
寒假作业二
寒假作业二(化学)可能用到的相对原子质量:H-1 C-12 N-14 O-16 Na-23 Cl-35.5 Cu-64一、选择题(每题只有一个选项符合题意。
共30个小题,每小题1分,共30分。
)1.空气的成分中,体积分数约占78%的是( )A.氧气 B.氮气 C.二氧化碳 D.稀有气体2.下列各图所示变化属于物理变化的是 ( )A.带火星的木条复燃 B.对着干冷玻璃片呼气 C.硫在氧气中燃烧D.将鸡蛋壳放入白醋中3.决定元素种类的是原子的A.质子数 B.中子数 C.电子数 D.最外层电子数4.下列物质中,属于纯净物的是A.生铁B.自来水 C.金刚石 D.空气5.下列物质的用途主要是由其化学性质决定的是A.干冰可用于人工降雨 B.活性炭可用于除去冰箱中的异味C.铜丝可用作导线 D.氮气可用作保护气6.下列有关氧气的说法正确的是A.氧气可用于炼钢 B.氧气难溶于水可用排水法收集C.氧气能燃烧有可燃性 D.同温同压下氧气密度比空气小7.国际互联网上报道“目前世界上约有20亿人患有缺铁性贫血”,这里的“铁”是指A.四氧化三铁B.铁单质 C.氧化铁D.铁元素8.市政府有关部门提醒大家,冬季燃煤要特别注意室内通风,以免造成人员中毒。
这里的有毒气体主要是指A.二氧化碳 B.氮气 C.一氧化碳D.氧气9.下列粒子结构示意图中,化学性质最稳定的是10.下列化学用语正确的是A.铝的元素符号:AL.2个氢原子:H2C.硫酸铁:FeSO4D.镁离子:Mg2+11.下图所示实验操作正确的是A.过滤B.倾倒液体C.检查气密性D.加热液体12.分子、原子和离子都是构成物质的粒子,下列物质由离子构成的是A.汞 B.石墨 C.水 D.氯化钠13.下列关于燃烧现象的描述中,正确的是A.碳在氧气中燃烧生成二氧化碳B.红磷在空气中燃烧产生大量白色烟雾C.硫在空气中燃烧发出淡蓝色火焰 D.铁丝在空气中剧烈燃烧,火星四射14.王羲之是我国宋朝的书法家,他的墨宝保存至今,极其珍贵。
高一上学期数学寒假作业二
启明班寒假作业二学校:___________姓名:___________班级:___________考号:___________一、单选题1.若函数2(0)3y x πωω⎛⎫=-> ⎪⎝⎭两零点间的最小距离为2π,则ω=( )A .1B .2C .3D .42.已知函数()2sin()0,||2f x x πωϕωϕ⎛⎫=+>< ⎪⎝⎭,其图象与直线1y =的相邻两个交点的距离分别为3π和23π,若13 f π⎛⎫= ⎪⎝⎭,则ϕ的值为( )A .6π B .6π- C .3π- D .3π3.设函数())f x x ωϕ=-,x ∈R ,其中0ω>,||ϕπ<.若08f π⎛⎫-= ⎪⎝⎭,58f π⎛⎫= ⎪⎝⎭()f x 的最小正周期大于2π,则( )A .13ω=,1124πϕ=B .13ω=,712πϕ=-C .23ω=,1112πϕ=D .23ω=,12πϕ=-4.已知函数()()sin 06f x x πωω⎛⎫=+> ⎪⎝⎭在区间,2ππ⎡⎤⎢⎥⎣⎦内单调递减,则实数ω的取值范围是( )A .2,13⎡⎤⎢⎥⎣⎦B .24,33⎡⎤⎢⎥⎣⎦C .[)1,2D .3,22⎡⎫⎪⎢⎣⎭5.已知函数()()sin f x x α=+在,43x ππ⎛⎫∈- ⎪⎝⎭上单调递增,则α的值可以是( )A .3π-B .4π-C .4π D .3π 6.若函数()()()sin πf x x ϕϕ=+<在π2π,33-⎡⎤⎢⎥⎣⎦上单调,则ϕ的值为( )A .2π3-或π3B .π3-或2π3C .5π6-或6π D .π6-或5π6 7.若函数()πsin 23f x x ⎛⎫=- ⎪⎝⎭与()πcos 4g x x ⎛⎫=+ ⎪⎝⎭都在区间()(),0πa b a b <<<上单调递减,则b a -的最大值为( )A .π3B .π2C .6πD .π 8.若函数()2sin 23f x x πϕ⎛⎫=-+ ⎪⎝⎭是奇函数,则ϕ的值可以是( )A .56π B .2π C .23π-D .2π-9.函数()sin 23f x x πϕ⎛⎫=++ ⎪⎝⎭为偶函数的一个充分条件( )A .6πϕ=B .6πϕ=-C .3πϕ=D .3πϕ=-10.已知函数()sin 22f x x x =,若函数()y f x ϕ=-为奇函数,则||ϕ的最小值是( ) A .12π B .6π C .3π D .712π 11.已知函数()sin(2)f x x ϕ=+的图象关于点π,06⎛⎫⎪⎝⎭中心对称,则||ϕ的最小值为( )A .π6B .π3C .2π3D .4π312.将函数2sin()3y x π=+的图象向左平移()0m m >个单位长度后,所得到的图象关于y 轴对称,则m 的最小值是( ) A .12π B .6π C .3π D .23π13.已知函数()21cos cos (0,)2f x x x x a x R ωωω=+->∈在[]0,π内有且仅有三条对称轴,则ω的取值范围是( ) A .27,36⎛⎫ ⎪⎝⎭B .75[,)63C .513,36⎫⎡⎪⎢⎣⎭D .138,63⎛⎫ ⎪⎝⎭14.已知函数π()sin (0)3f x x ωω⎛⎫=-> ⎪⎝⎭在(π,2π)内不存在对称中心,则ω的取值范围为( ).A .12,33⎡⎤⎢⎥⎣⎦B .20,3⎛⎤ ⎥⎝⎦C .10,6⎛⎤⎥⎝⎦ D .1120,,633⎛⎤⎡⎤⋃ ⎥⎢⎥⎝⎦⎣⎦15.若函数()sin (0)3f x x πωω⎛⎫=+> ⎪⎝⎭在区间(),2ππ内没有最值,则ω的取值范围是( )A .1120,,1233⎛⎤⎡⎤⋃ ⎥⎢⎥⎝⎦⎣⎦B .1170,,12612⎛⎤⎡⎤ ⎥⎢⎥⎝⎦⎣⎦C .70,12⎛⎤ ⎥⎝⎦D .12,33⎡⎤⎢⎥⎣⎦ 16.若函数()sin 6f x x πω⎛⎫=+ ⎪⎝⎭(0ω>)在,44ππ⎛⎫- ⎪⎝⎭有最大值无最小值,则ω的取值范围是( )A .48,33⎛⎫ ⎪⎝⎭B .48,33⎛⎤ ⎥⎝⎦C .416,33⎛⎫ ⎪⎝⎭D .416,33⎛⎤ ⎥⎝⎦17.已知函数()()sin cos 0f x x a x a =+>的最大值为2,若方程()f x b =在区间13π0,6⎛⎫⎪⎝⎭内有三个实数根123,,x x x ,且123x x x <<,则1232x x x ++等于( )A .8π3 B .10π3C .4πD .25π618.已知函数()()22cos 10,2xf x x x ωωω=->∈R ,若函数()f x 在区间(),2ππ上没有零点,则ω的取值范围是( ) A .55110,,12612⎛⎤⎡⎤⎥⎢⎥⎝⎦⎣⎦ B .211,312⎡⎤⎢⎥⎣⎦ C .511,612⎛⎫⎪⎝⎭D .250,,1211312⎛⎫ ⎪⎝⎝⎛⎤ ⎥⎦⎭19.已知函数()()1sin 0f x x x ωωω=+>在()0,π上有且只有3个零点,则实数ω的取值范围是( ) A .1137,26⎛⎤ ⎥⎝⎦B .137,62⎛⎤ ⎥⎝⎦C .725,26⎛⎤ ⎥⎝⎦D .2511,62⎛⎤ ⎥⎝⎦20.已知函数()()sin 0,2f x x πωϕωϕ⎛⎫=+>< ⎪⎝⎭图象的两相邻对称轴之间的距离为2π,且3f x π⎛⎫+ ⎪⎝⎭为偶函数,则ϕ=( )A .6π B .6π- C .3π- D .3π21.若直线12x π=是曲线()sin 04y x πωω⎛⎫=-> ⎪⎝⎭的一条对称轴,且函数sin 4y x πω⎛⎫=- ⎪⎝⎭在区间0,12π⎡⎤⎢⎥⎣⎦上不单调,则ω的最小值为( )A .9B .15C .21D .3322.已知函数()()sin 06f x x πωω⎛⎫=-> ⎪⎝⎭在区间3,34ππ⎡⎤-⎢⎥⎣⎦上单调递增,且在区间[]0,π上只取得一次最大值,则ω的取值范围是( )A .30,4⎡⎤⎢⎥⎣⎦ B .80,9⎛⎤ ⎥⎝⎦ C .28,39⎡⎤⎢⎥⎣⎦ D .38,49⎡⎤⎢⎥⎣⎦23.已知函数()()sin 0,0,2f x A x A πωϕωϕ⎛⎫=+>>< ⎪⎝⎭,若函数()f x 的一个零点为6π.其图像的一条对称轴为直线512x π=,且()f x 在,64ππ⎛⎫ ⎪⎝⎭上单调,则ω的最大值为( )A .2B .6C .10D .1424.已知函数()sin()(0,0)f x A x ωϕωϕπ=+><<为偶函数,在0,3π⎡⎫⎪⎢⎣⎭单调递减,且在该区间上没有零点,则ω的取值范围为( ) A .30,2⎛⎫ ⎪⎝⎭B .31,2⎡⎤⎢⎥⎣⎦C .35,22⎡⎤⎢⎥⎣⎦D .30,2⎛⎤ ⎥⎝⎦二、填空题25.已知函数()cos f x x x ωω-(0)ω>的最小正周期为π,则ω=___.26.已知函数()()sin f x x ω=(0ω>)在区间ππ,123⎛⎤- ⎥⎝⎦上单调递增,在区间π5π,312⎡⎫⎪⎢⎣⎭上单调递减,则ω的值是______.27.已知函数()sin 2062f x x ππϕϕ⎛⎫⎛⎫=++<< ⎪ ⎪⎝⎭⎝⎭在,32ππ⎛⎫ ⎪⎝⎭上单调递增,则ϕ的取值范围为_________.28.将函数()sin (0)6f x x πωω⎛⎫=+> ⎪⎝⎭图像上所有点的横坐标伸长到原来的2倍,再向右平移6π个单位长度,得到函数()y g x =的图像,若函数()y g x =为偶函数,则ω的最小值为_________.29.已知函数()()()sin 0,0f x x ωϕωϕπ=+><<,且()f x 与()3f x π+均为偶函数,则ω的最小值是______.30.已知函数()()ππsin 22f x x ϕϕ⎛⎫=+-<< ⎪⎝⎭的图像关于直线π4x =对称,则ϕ=__________.31.若函数sin y x ω=(0ω>)在区间[]0,2上恰好取到3次最小值,请写出一个符合题意的ω的值:___________. 32.已知函数()π2sin 6f x x ω⎛⎫=+ ⎪⎝⎭中x 在任意的15个单位长度的距离内能同时取得最大值和最小值,那么正实数ω的取值范围是________.33.设函数()()sin 03f x x πωω⎛⎫=-> ⎪⎝⎭,若()f x 在0,2π⎛⎫ ⎪⎝⎭上有且仅有2个零点,则实数ω的取值范围为______.34.已知函数()sin (0)f x x x ωωω=>,若函数()f x 的图像在区间π()0,x ∈上恰有2个零点,则实数ω的取值范围为__________. 35.函数()()4sin 6f x x πωω*⎛⎫=+∈ ⎪⎝⎭N ,若,06π⎛⎫- ⎪⎝⎭是()f x 的一个对称中心,且()f x 在52,369ππ⎛⎫ ⎪⎝⎭上单调,则ω的最小值为_________.36.已知函数π()sin (0)6f x x ωω⎛⎫=+> ⎪⎝⎭,若π3f x ⎛⎫+ ⎪⎝⎭为偶函数,()f x 在区间π7π,312⎛⎫ ⎪⎝⎭内单调,则ω的最大值为_________.37.已知函数()2sin f x x ω=(0ω>)在区间3,43ππ⎡⎤-⎢⎥⎣⎦上单调递增,且函数()2sin 2g x x ω=+在[]2,0π-上有且仅有一个零点,则实数ω的取值范围是_______. 38.已知函数()()sin f x x ωϕ=+(其中0ω>,2πϕ<),若()0f T =(T 为周期),4x π=是函数()f x 图像的一条对称轴,()f x 在区间3,816ππ⎛⎫⎪⎝⎭上单调,则ω的值为______.。
英语寒假作业二
英语寒假作业二第二部分阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C和D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。
ATake time to walk in Shakespeare’s footsteps,without the usual crowds.Your visit to Shakespeare’s Birthplace will help us to make sure that Shakespeare’s heritage survives this difficult period for future visitors to enjoy.To keep our visitors and staff safe,we have introduced a timed ticket system.All tickets must be booked in advance.Groups larger than6are not allowed to book unless they are part of the same household.See below for more details and read about the extra safety measures we’ve put in place.Please note that Anne Hathaway’s Cottage,Shakespeare’s New Place,Mary Arden’s Farm and Hall’s Croft are closed.Pre-bookingWe’ll be unable to allow you entry without a pre-booked timed entry ticket.Tickets will be sold every Friday, up to2weeks in advance.Before your visitPlease remember the following things,and check our website and social media for updates before travelling.●If showing COVID-19symptoms(症状),please stay at home.●Wear a mask in indoor spaces(unless noted).●We conduct temperature checks.●Bag checks are in operation.●We do not offer baggage store facilities.●Be ready for cashless payment.NHS COVID-19Test and Trace appVisitors are encouraged to download the NHS COVID-19Test and Trace app before arrival at Shakespeare’s Birthplace and“check-in”by scanning the QR code available at the ticket desk and entrance to the shop.1.Which of the following places can you visit now?A.Mary Arden’s Farm.B.Shakespeare’s Birthplace.C.Anne Hathaway’s Cottage.D.Shakespeare’s New Place.2.Which kind of ticket can ensure your entry?A.A ticket released on Friday.B.A pre-bought season ticket.C.A pre-booked timed entry ticket.D.An online booked yearly ticket.3.What should you do before visiting?A.Get your bag checked.B.Take cash with you.C.Have your face covered.D.Stay at home for two weeks.BMost teens are trying to find their purposes in life.However,Gitanjali Rao,a15-year-old girl has been coming up with creative solutions to worldwide problems since she was10.It is,therefore,not surprising that the teen has won the honor of“America’s Top Young Scientist”.In the3rd grade,Rao was inspired to do something after seeing the city’s primary water supply in her hometown was polluted by a factory nearby and that high levels of lead(铅)made its way into people’s drinking water.After2months’research,Rao designed a tool that used sensors to instantly discover lead in water.Called Tethys,after the Greek Goddess(女神)of freshwater,it informs the residents via an app if their drinking water contains lead.The design earned her the3M Young Scientist Challenge in2017.She is now working with scientists and medical professionals to test Tethys’potential and hopes the device will be ready for market in the near future.Later,Rao took on another social issue—drug(毒品)addiction.Her app,called Epione,which won the Health Pillar Prize in May2019,is designed to catch drug addiction in young adults before it’s too late.More recently,the teen has developed an app named Kindly,which uses AI technology to find possible signs of cyberbullying(网络欺凌).When users type in a word or phrase,Kindly is able to pick it up if it’s bullying,and then it gives the choice to edit it or send it the way it is.It gives them the chance to rethink what they are saying so that they know what to do next time.Gitanjali Rao has been selected from5,000equally impressive nominees(被提名人)for TIME’s first-ever “Kid of the Year”.4.What led to Rao’s inventing Tethys?A.The accident of lead pollution.B.The issue with drug addiction.C.The shortage of water supplies.D.The high cost of making water clean.5.What is Rao expecting of Tethys?A.It’ll be fitted to cellphones.B.It’ll win her a higher prize.C.It’ll be put on the market soon.D.It’ll remove lead from water.6.What will Kindly allow users to do?A.Receive warning signals of threat.B.Input words into a computer directly.C.Choose from safe social networking sites.D.Consider their words before posting online.7.Which of the following words can best describe Rao?A.Professional and positive.B.Creative and productive.C.Inspiring and adventurousD.Determined and amazingCThough many of us may have been away somewhere nice last summer,few would say that we’ve “summered”.“Summer”is clearly a noun-a verbed noun.In our childhood,we all learned the difference between a noun and a verb.With such a clear definition,it was easy to notice the difference.Not so in adulthood,when we are expected to“foot”the bill and“chair”meetings. Chances are that you didn’t feel uncomfortable about those verbed nouns.“The verbing of nouns is as old as the English language,”says Patricia,a former editor at The New York Times Book Review.Experts found that20%of all English verbs were originally nouns.And it seems to be snowballing. Since1900,about40%of new verbs have come from nouns.Even though the conversion(转化)is quite common,plenty of language experts disagree with it.William Strunk Jr.and E.B.White have this to say,“Many nouns lately have been pressed into service as verbs.Not all are bad,but some are in doubt.”The Chicago Manual of Style takes a similar standpoint,advising writers to use verbs with great care.“Sometimes people dislike a new verb because they refuse to accept what is unfamiliar to them,”says Patricia. That’s why we’re comfortable“hosting”a party,but we might feel upset by the thought of“medaling”in sports. So are there any rules for verbing?Benjamin Dreyer,copy chief at Random House,doesn’t offer a rule,but suggests that people think twice about“verbifying”(使动词化)a noun if it’s easily replaced by an already existing popular verb.Make sure it’s descriptive but not silly-sounding,he says.In the end,however,style is subjective(主观的).The easy conversion of nouns to verbs has been part ofEnglish grammar for centuries.It is one of the processes that make English“English”.Not every new word passes into general use,but as for trying to end verbing altogether,forget it.8.What can we learn about the verbing of nouns?A.It has come into use since a long time ago.B.It has been supported by many language experts.C.It is easily replaced by existing verbs in practice.D.It is more commonly accepted by children than adults.9.What is language experts’attitude towards the verbing of nouns?A.Cold.B.Careful.C.Unclear.D.Positive.10.What can we infer from the last two paragraphs?A.It is impossible to end the verbing of nouns.B.New verbs will stay in the English language forever.C.Most people are against using new verbs from nouns.D.There is an obvious rule for changing verbs to nouns.11.What can be the best title for the text?A.Are all new verbs from nouns?B.Are there any rules for verbing?C.Are you comfortable about a new verb?D.Are“summering”and“medaling”annoying?DAnts know when an earthquake is about to strike,researchers have discovered.Their behavior changes greatly before the quake and they resume normal functioning only a day after it.Gabriele Berberich of the University of Duisburg-Essen in Germany presented these findings according to Live Science.Berberich and her team discovered that red wood ants preferred to build their homes right along active faults (断层)in Germany.They counted15,000mounds(土堆)lining the faults.These faults are the places where the earth breaks in earthquakes.Using a special camera that tracked changes in activity,Berberich and her team tracked the ants round the clock for three years.They found that the ants’behavior changed only when the quake was over magnitude2.0. There were10earthquakes between magnitude2.0and3.2during this period,and many smaller ones.Humans can also sense quakes over magnitude2.0only.According to Berberich,normal ant activity is made up of going about collecting food during the day and resting in the night.But before an earthquake,the ants didn’t go back to their mound in the night and moved around outside it.This strange behavior continued till a day after the earthquake,Berberich told a news conference, according to Live Science.How do ants know an earthquake is coming?Berberich suggested that they could either be picking up changing gas or noting small changes in the earth’s magnetic fields(磁场).“Red wood ants have special cells which can sense changes in carbon dioxide levels.They also have special cells for discovering electromagnetic fields,”she said.Berberich and her team are planning to continue the research in areas where there are more and bigger earthquakes.12.The underlined word“resume”in Paragraph1probably means“________”A.presentB.recoverC.quitD.improve13.What is the purpose of the first paragraph?A.To bring in the main topic.B.To make the text interesting.C.To introduce a famous researcher.D.To tell how to predict an earthquake.14.What happens to the ants before an earthquake?A.They are too excited to rest.B.They don’t collect their food.C.They get lost on their way home.D.They refuse to go inside their mound.15.What can be learned about the ants from the passage?A.They can only sense smaller earthquakes.B.They have two ways to predict earthquakes.C.They can be depended on to warn people of earthquakes.D.They like to build their homes where earthquakes happen.第二节(共5小题;每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填人空白处的最佳选项,并在答题卡上将该项涂黑。
2022-2021学年上学期高一语文寒假作业 02 必修一、必修二文言文单元(解析版 )
作业范围:必修一、必修二文言文单元姓名:学校:班级:时间:60分钟分值:100分第Ⅰ卷(共36分)一、语言基础学问运用(36分,每小题6分)题号 1 2 3 4 5 6答案1.下列词语中,加横线字注音全都正确的一项是()A.处理(chù)目眦(zì)樊笼(fán)浅尝辄止(zhé)B.混沌(hùn)癸丑(guǐ)房檩(lǐn)流觞曲水(shāng)C.点缀(zhuì)猝然(cù)垝垣(wēi)义愤填膺(yīng)D.酾酒(shī)茎叶(jìng)愀然(qiǎo)纤尘不染(qiān)【来源】河北省石家庄市一中2021-2022学年高一上学期期末考试【答案】B【解析】A项,“处”应读“chǔ”;C项,“垝”应读“guǐ”;D项,“茎”应读“jīng”,“纤”应读“xiān”。
【题型】选择题【难度】较易2.下列各组词语中,没有错别字的一项是()A.扼腕婉然胸怀报负沧海一粟B.渔樵窈然虚无缥渺慧风和畅C.懈怠兰棹殚精竭虑俯仰天地D.隽永宿命正襟危坐究由自取【来源】贵州省贵阳市第六中学2022-2021学年高一11月月考语文试题【答案】C【题型】选择题【难度】较易3.下列加横线的文言实词解释不正确的一项是()A.而燕国见陵之耻除矣陵:侵害,欺侮B.因人之力而敝之敝:损害C.料大王士卒足以当项王乎当:阻挡D.旦日飨士卒飨:用酒食款待来宾,犒劳【来源】宁夏六盘山高级中学2021-2022学年高一上学期其次次月考试题【答案】C【解析】当:对等,比得上。
【题型】选择题【难度】较易4.下列句子中没有词类活用状况的一项是()A.秦、晋围郑,郑既知亡矣B.秦武阳色变振恐,群臣怪之C.越国以鄙远,君知其难也D.火尚足以明也【来源】山东省济南第一中学2021-2022学年高一语文12月月考试题【答案】A【题型】选择题【难度】简洁5.下列加横线词语不属于古今异义的一项是()A.今行而无信,则秦未可亲也B.于是余有叹焉C.逝者如斯,而未尝往也 D.行李之往来【来源】太原五中2022-2021学年高一语文10月月考质量检测试题【答案】C【解析】A项,“无信”,今义,不讲信用;古义,没有信物。
2022-2023学年人教版八年级(上)数学寒假作业(二)
2022-2023学年人教版八年级(上)数学寒假作业(二)一.选择题(共8小题)1.已知:a2﹣3a+1=0,则a+﹣2的值为()A.+1B.1C.﹣1D.﹣52.若分式的值为零,则x的值是()A.1B.﹣1C.±1D.23.若x,y均为正整数,且2x+1•4y=128,则x+y的值为()A.3B.5C.4或5D.3或4或5 4.如图,△ABC中,BD平分∠ABC,BC的中垂线交BC于点E,交BD于点F,连接CF.若∠A=60°,∠ABD=24°,则∠ACF的度数为()A.48°B.36°C.30°D.24°5.如图,AB∥CD,BP和CP分别平分∠ABC和∠DCB,AD过点P,且与AB垂直.若AD =8,则点P到BC的距离是()A.8B.6C.4D.26.如图是由4个相同的小正方形组成的网格图,其中∠1+∠2等于()A.150°B.180°C.210°D.225°7.如图,△ABC中,BO,CO分别是∠ABC,∠ACB的平分线,∠A=50°,则∠BOC等于()A.110°B.115°C.120°D.130°8.在△ABC中,∠A:∠B:∠C=3:4:5,则∠C等于()A.45°B.60°C.75°D.90°二.填空题(共6小题)9.如图,AB∥CD,∠1、∠2、∠3是五边形ABCDE的外角,若∠1+∠3=70°,则∠2=°.10.如图,在Rt△ABC中,∠C=90°,AD是∠BAC的平分线,CD=3,AB=6,则△ABD 的面积是.11.等腰三角形一腰上的高与另一腰的夹角为30°,则它的顶角为.12.多项式x2+mx+5因式分解得(x+5)(x+n),则m=,n=.13.已知关于x的分式方程﹣=1的解为负数,则k的取值范围是.14.若,则的值为.三.解答题(共6小题)15.先化简:,并从0,﹣1,2中选一个合适的数作为a的值代入求值.16.先化简,再求值:4(x﹣1)2﹣(2x+3)(2x﹣3),其中x=﹣1.17.在△ABC中,AD平分∠BAC,BD⊥AD,垂足为D,过D作DE∥AC,交AB于E,若AB=5,求线段DE的长.18.如图,DE⊥AB于E,DF⊥AC于F,若BD=CD,BE=CF.求证:(1)AD平分∠BAC;(2)AC=AB+2BE.19.如图,F A⊥EC,垂足为E,∠C=20°,∠F=40°.求∠FBC的度数.20.如图,在△ABC中,点D是边BC上一点,DE⊥AB于点E,连接CE,∠ACE=∠BCE,∠ACB=50°,∠B=60°.求∠CED的度数.2022-2023学年人教版八年级(上)数学寒假作业(二)参考答案与试题解析一.选择题(共8小题)1.已知:a2﹣3a+1=0,则a+﹣2的值为()A.+1B.1C.﹣1D.﹣5【解答】解:∵a2﹣3a+1=0,且a≠0,∴同除以a,得a+=3,则原式=3﹣2=1,故选:B.2.若分式的值为零,则x的值是()A.1B.﹣1C.±1D.2【解答】解:∵分式的值为零,∴|x|﹣1=0,x+1≠0,解得:x=1.故选:A.3.若x,y均为正整数,且2x+1•4y=128,则x+y的值为()A.3B.5C.4或5D.3或4或5【解答】解:∵2x+1•4y=2x+1+2y,27=128,∴x+1+2y=7,即x+2y=6∵x,y均为正整数,∴或∴x+y=5或4,故选:C.4.如图,△ABC中,BD平分∠ABC,BC的中垂线交BC于点E,交BD于点F,连接CF.若∠A=60°,∠ABD=24°,则∠ACF的度数为()A.48°B.36°C.30°D.24°【解答】解:∵BD平分∠ABC,∴∠DBC=∠ABD=24°,∵∠A=60°,∴∠ACB=180°﹣60°﹣24°×2=72°,∵BC的中垂线交BC于点E,∴BF=CF,∴∠FCB=24°,∴∠ACF=72°﹣24°=48°,故选:A.5.如图,AB∥CD,BP和CP分别平分∠ABC和∠DCB,AD过点P,且与AB垂直.若AD =8,则点P到BC的距离是()A.8B.6C.4D.2【解答】解:过点P作PE⊥BC于E,∵AB∥CD,P A⊥AB,∴PD⊥CD,∵BP和CP分别平分∠ABC和∠DCB,∴P A=PE,PD=PE,∴PE=P A=PD,∵P A+PD=AD=8,∴P A=PD=4,∴PE=4.故选:C.6.如图是由4个相同的小正方形组成的网格图,其中∠1+∠2等于()A.150°B.180°C.210°D.225°【解答】解:由题意得:AB=ED,BC=DC,∠D=∠B=90°,∴△ABC≌△EDC(SAS),∴∠BAC=∠1,∠1+∠2=180°.故选:B.7.如图,△ABC中,BO,CO分别是∠ABC,∠ACB的平分线,∠A=50°,则∠BOC等于()A.110°B.115°C.120°D.130°【解答】解:∵∠A=50°,∴∠ABC+∠ACB=180°﹣∠A=180°﹣50°=130°,∵BO,CO分别是∠ABC,∠ACB的平分线,∴∠OBC=∠ABC,∠OCB=∠ACB,∴∠OBC+∠OCB=(∠ABC+∠ACB)=×130°=65°,∴∠BOC=180°﹣(∠OBC+∠OCB)=180°﹣65°=115°.故选:B.8.在△ABC中,∠A:∠B:∠C=3:4:5,则∠C等于()A.45°B.60°C.75°D.90°【解答】解:180°×==75°即∠C等于75°.故选:C.二.填空题(共6小题)9.如图,AB∥CD,∠1、∠2、∠3是五边形ABCDE的外角,若∠1+∠3=70°,则∠2=110°.【解答】解:如图,延长AE、CD并交于点F.∵AB∥CD,∴∠1=∠EFD.∵∠1+∠3=70°,∴∠EFD+∠3=70°.∴∠AED=70°.∴∠2=180°﹣∠AED=110°.故答案为:110.10.如图,在Rt△ABC中,∠C=90°,AD是∠BAC的平分线,CD=3,AB=6,则△ABD 的面积是9.【解答】解:如图,过D作DE⊥AB于E,∵AD平分∠BAC,∠C=90°,∴DE=DC=3,∵AB=6,∴△ABD的面积=AB•DE=×6×3=9.故答案为:12.11.等腰三角形一腰上的高与另一腰的夹角为30°,则它的顶角为60°或120°.【解答】解:当高在三角形内部时,顶角是60°;当高在三角形外部时,顶角是120°.故答案为:60°或120°.12.多项式x2+mx+5因式分解得(x+5)(x+n),则m=6,n=1.【解答】解:∵(x+5)(x+n)=x2+(n+5)x+5n,∴x2+mx+5=x2+(n+5)x+5n∴,∴,故答案为:6,1.13.已知关于x的分式方程﹣=1的解为负数,则k的取值范围是k>且k≠1.【解答】解:去分母得:(x+k)(x﹣1)﹣k(x+1)=x2﹣1,去括号得:x2﹣x+kx﹣k﹣kx﹣k=x2﹣1,移项合并得:x=1﹣2k,根据题意得:1﹣2k<0,且1﹣2k≠±1解得:k>且k≠1故答案为:k>且k≠1.14.若,则的值为5.【解答】解:∵+=,∴=,∴(m+n)2=7mn,∴原式====5.故答案为:5.三.解答题(共6小题)15.先化简:,并从0,﹣1,2中选一个合适的数作为a的值代入求值.【解答】解:=×,=×=﹣,当a=0时,原式=1.16.先化简,再求值:4(x﹣1)2﹣(2x+3)(2x﹣3),其中x=﹣1.【解答】解:原式=4(x2﹣2x+1)﹣(4x2﹣9)=4x2﹣8x+4﹣4x2+9=﹣8x+13,当x=﹣1时,原式=8+13=21.17.在△ABC中,AD平分∠BAC,BD⊥AD,垂足为D,过D作DE∥AC,交AB于E,若AB=5,求线段DE的长.【解答】解:∵AD平分∠BAC,∴∠BAD=∠CAD,∵DE∥AC,∴∠CAD=∠ADE,∴∠BAD=∠ADE,∴AE=DE,∵AD⊥DB,∴∠ADB=90°,∴∠EAD+∠ABD=90°,∠ADE+∠BDE=∠ADB=90°,∴∠ABD=∠BDE,∴DE=BE,∵AB=5,∴DE=BE=AE=AB=2.5.18.如图,DE⊥AB于E,DF⊥AC于F,若BD=CD,BE=CF.求证:(1)AD平分∠BAC;(2)AC=AB+2BE.【解答】(1)证明:∵DE⊥AB,DF⊥AC,∴∠E=∠DFC=90°,∴BD=CD,BE=CF,∴Rt△BED≌Rt△CFD(HL),∴DE=DF,∵DE⊥AB,DF⊥AC,∴AD平分∠BAC;(2)证明:由(1)可知AD平分∠BAC,∴∠EAD=∠CAD,∵DE⊥AB于E,DF⊥AC于F,∴∠E=∠DF A=90°,又∵AD=AD,∴△AED≌△AFD(AAS),∴AE=AF,∵CF=BE,∴AC=AF+CF=AE+BE=AB+BE+BE=AB+2BE.19.如图,F A⊥EC,垂足为E,∠C=20°,∠F=40°.求∠FBC的度数.【解答】解:在△AEC中,F A⊥EC,∴∠AEC=90°,∴∠A=90°﹣∠C=70°.∴∠FBC=∠A+∠F=70°+40°=110°.20.如图,在△ABC中,点D是边BC上一点,DE⊥AB于点E,连接CE,∠ACE=∠BCE,∠ACB=50°,∠B=60°.求∠CED的度数.【解答】解:∵∠ACE=∠BCE,∠ACE+∠BCE=∠ACB=50°,∴∠BCE=20°,∠ACE=30°.∵DE⊥AB,∴∠BED=90°,∴∠BDE=90°﹣∠B=90°﹣60°=30°.∵∠BDE是△CDE的外角,∴∠BDE=∠BCE+∠CED,∴∠CED=∠BDE﹣∠BCE=30°﹣20°=10°。
高二寒假作业二试题
2021届高二语文寒假作业〔二〕正确使用词语〔包括熟语〕专项训练1.依次填入以下各句中横线处的词语,最恰当的一项是哪一项( )①针对食品质量严重________人民群众安康平安的情况,检察机关集中开展依法严惩食品平安领域犯罪工作,推动健全食品平安监管长效机制。
②北客站的建立将全面________作为经济开展龙头的地位,加速实现以为核心来带动半岛城群全面崛起的目的。
③崂山雕龙嘴村整合自然、历史和文化资源,________集水果采摘、观光旅游、海洋文化传播为一体的乡村旅游度假区,被评为“中国最美村镇〞。
A. 损害凸现塑造B. 危害凸现塑造C. 危害凸显打造D. 损害凸显打造2. 依次填入以下各句横线处的成语,最恰当的一组是( )①被提拔为HY副所长的他,深化到巴河镇的村村组组,为维护一方社会的稳定________。
②HY一位动画HY说,每做完一部片子,就好似自己死了一次又活过来一样,真的是________。
③警方经过3个多月的困难侦查后,终于揭开了这起________、精心谋划的HY案的真相。
A. 殚精竭虑呕心沥血处心积虑B. 呕心沥血殚精竭虑处心积虑C. 殚精竭虑处心积虑呕心沥血D. 呕心沥血处心积虑殚精竭虑3.依次填入以下句中横线处的词语,最恰当的一项是哪一项( )①电视剧?皮五传奇?讲述的是明朝井小民皮五揭露婚托骗财以及屠夫卖肉作假的故事,被认为________了当今社会的一些不良现象,具有辛辣的挖苦意义。
②由于竞争剧烈,压力较大,大型企业的职工很容易出现各种各样的心理问题,管理人员对此应该高度重视,对相关人员及时进展心理________。
③大学毕业后,他本想到京城寻求更好的开展时机,但父母却希望他陪伴在身边,他不愿违犯二老的心愿,只好________。
A. 映射疏通曲从B. 影射疏通屈服C. 影射疏导曲从D. 映射疏导屈服4.依次填入以下各句横线处的成语,最恰当的一组是( )①对于吹瓶机来说,虽然近年来国产吹瓶机技术开展迅猛,但是,并不代表在消费程度上已经到达________的程度,仍然存在很多问题需要改良。
2022-2023学年高二化学寒假作业2(含答案)
浑源七中高二化学寒假作业2姓名:__________班级:__________考号:__________一、单选题(共20小题)1. 24Cr原子处于基态时,价电子排布可用轨道表示式表示成,而不是。
下列说法正确的是( )A. 这两种排布方式都符合能量最低原理B. 这两种排布方式都符合泡利原理C. 这两种排布方式都符合洪特规则D. 这个实例说明洪特规则有时候和能量最低原理是矛盾的2. 下列关于微粒半径大小的比较中正确的是( )A. Na+<Mg2+<Al3+<O2-B. S2->Cl->Na+>Al3+C. Na<Mg<Al<SiD. Cs<Rb<K<Na3. 下列物质溶于水因水解而呈碱性的是( )A. Na2OB. Na2CO3C. NH4ClD. NH3·H2O4. 已知pAg+=-lg c(Ag+),pX-=-lg c(X-)。
某温度下,AgBr、AgCl在水中的沉淀溶解平衡曲线如图所示。
下列说法错误的是( )A. a和c两点的K w相同B. K sp(AgCl)=1.0×10-14mol2·L-2C. 向饱和AgCl溶液中加入NaCl固体,可使a点变到d点D. AgCl(s)+Br-(aq)AgBr(s)+Cl-(aq)平衡常数K=5. 已知:25 ℃时H2C2O4的p K a1=1.22,p K a2=4.19,CH3COOH的p K a=4.76(电离常数K 的负对数-lg K=p K)。
下列说法正确的是( )A. 浓度均为0.1 mol·L-1NH4HC2O4和CH3COONH4溶液中:c(NH)前者小于后者B. 将0.1 mol·L-1的K2C2O4溶液从25 ℃升温至35 ℃,减小C. 0.1 mol·L-1K2C2O4溶液滴加盐酸至pH=1.22:c(H+)-c(OH-)=c(Cl-)-3c(HC2O )D. 向0.1 mol·L-1CH3COONa溶液中滴加少量0.1 mol·L-1H2C2O4溶液:CH3COO-+H2C2O4===CH3COOH+HC2O6. 根据如图所示的各物质能量变化关系,判断下列热化学方程式正确的是( )A. C(s,金刚石)+O2(g)===CO2(g) ΔH1=a kJ·mol-1(a<0)B. C(s,石墨)+O2(g)===CO2(g) ΔH2=b kJ·mol-1(b>0)C. C+O2===CO2ΔH3=c kJ·mol-1(c>0)D. C(s,金刚石)===C(s,石墨) ΔH4=d kJ·mol-1(d>0)7. 下列叙述中正确的是( )①电解池是将化学能转化为电能的装置②原电池是将电能转化为化学能的装置③金属和石墨导电均为物理变化,电解质溶液导电是化学变化④不能自发进行的氧化还原反应,通过电解的原理有可能实现⑤电镀过程相当于金属从阳极迁移到阴极上,可视为物理变化⑥电解池中阳离子移向阴极,原电池中阳离子移向正极A. ①②③④B. ③④C. ③④⑥D. ③④⑤8. 电致变色器件可智能调控太阳光透过率,从而实现节能。
高二语文寒假作业二
高二语文寒假作业二高三2013-02-07 15:12高二语文寒假作业二一、选择题(每题3分,共15分)1.下列词语中加点的字,读音完全正确的一组是A.谂知(rěn)宁可(nìng)冠心病(guān)翘首回望(qiáo)B.吐蕃(fān)庇护(bì)歼击机(jiān)呱呱坠地(gū)C.请帖(tiě)梵文(fán)发横财(hâng)按捺不住(nà)D.链接(liàn)创口(ch uāng)倒春寒(dào)拈花惹草(niān)2.下列各组词语中,没有错别字的一组是A.寒喧编辑木板画迫不及待B.熨帖暴躁消声器举步为艰C.厮杀聒噪流线型殒身不恤D .诀绝废弛显像管一筹莫展3.依次填入下列各句中横线处的词语,最恰当的一组是①中华文明源远流长,经过传统民俗文化和民间艺术的,我们的精神上才有了华夏儿女的文化印记。
②上海世博会是第一个正式提出“低碳世博”理念的世博会,中国在过程中也在全力实践这一理念。
③朝鲜媒体近期接连发表评论,美国接受朝鲜提出的签订和平协定以替代《朝鲜停战协定》的建议。
A.熏染筹办督促B.熏陶筹措督促C.熏陶筹办敦促D.熏染筹措敦促4.下列句子中,加点的成语使用正确的一项是A.7.23甬温线特别重大铁路交通事故,再次暴露了安全责任落实不到位、安全管理不严格等问题,人们对这场本不该发生的事件痛不欲生。
B.2011年我国许多地方的大旱警示我们,本来就水资源匮乏的北京离“水贵如油”的情形指日可待,节水意识还需要进一步加强。
C.位于2011西安世园会主轴线上的自然馆,建筑体型独特,器宇轩昂,是2011年西安世界园艺博览会的标志性建筑。
D.日前的李双江之子无照驾车打人事件,与河北大学李启铭交通肇事案如出一辙,网民均认为事件发生的根本原因在于父母溺爱、管教无方,以及同阶层玩伴间相互影响。
5.下列各句中,没有语病的一句是A.在中国,每年由于酒后驾车引发的交通事故达数万起,而造成死亡的交通事故中50%以上都与酒后驾车有关:这些数据触目惊心,已经成为交通事故的第一大“杀手”。
七年级数学寒假作业(二)
七年级数学寒假作业(二)一、选择题1.方程23x -=-的解是 ( ) A .5x =- B .5x = C .1x =- D .1x =2.解方程1124x x+-=,去分母,去括号得( ) A .122x x -+= B .122x x --= C .422x x -+= D .422x x --= 3.下列等式变形正确的是 ( ) A .若42x =,则2x =B .若4223x x -=-,则4322x x +=-C .若4(1)32(1)x x +-=+,则4(1)2(1)3x x +++=D .若3112123x x+--=,则3(31)2(12)6x x +--=4.若1x =是方程20x a +=的解,则a= ( ) A .1 B .2 C .1- D .2- 5.已知关于x 的方程250x a -+=的解是2x =-,则a 的值为 ( ) A .2- B .1- C .1 D .26.一艘轮船在甲、乙两地之间航行,已知水流速度是5千米时,顺水航行需要3小时,逆水航行需要4小时,则甲乙两地间的距离是 ( ) A .120千米 B .110千米 C .130千米 D .175千米7.如图,学校实验室需要向某工厂定制一批三条腿的桌子,已知该工厂有24名工人,每人每天可以生产20块桌面或300条桌腿,1块桌面需要配3条桌腿,为使每天生产的桌面和桌腿刚好配套,设安排x 名工人生产桌面,则下面所列方程正确的是 ( ) A .203300(24)x x =⨯- B .300320(24)x x =⨯- C .320300(24)x x ⨯=- D .20300(24)x x =-8.古埃及人的“纸草书”中记载了一个数学问题:一个数,它的三分之二,它的一半,它的七分之一,它的全部,加起来总共是33.若设这个数是x ,则所列方程为 ( )A .213337x x x ++=B .21133327x x x ++=C .21133327x x x x +++=D .21133372x x x x ++-=9.规定一种新运算:22a b a b =-⊗,若2[1()]6x -=⊗⊗,则x 的值为 ( ) A .1- B .1 C .2 D .2-10.代数式25ax b +的值会随x 的取值不同而不同,如表是当x 取不同值时对应的代数式的值,则关于x 的方程254ax b +=-的解是 ( )x4- 3-2- 1- 025ax b +1284 04-A .12B .4C .2-D .0 二、填空题11.已知方程240x -=,则x = .12.关于x 的方程253x a +=的解与方程220x +=的解相同,则a 的值是 .13.某下水管道工程由甲、乙两个工程队单独铺设分别需要10天,15天完成.如果甲队先单独施工5天,然后由甲、乙两队共同施工完成整个工程,则还需多少天?若设还需天数为x 天,则可列方程为 . 14.姐姐比弟弟大3岁,若5年前姐姐的年龄是弟弟的2倍,则姐姐现在的年龄是 岁.15. 如果10.20.3x y+=,那么101023x y += . 16.已知1x =是关于x 的方程(26)20m x --=的解,则m = .17.假设“▲、●、■”分别表示三种不同的物体.如图,前两架天平保持平衡,如果要使第三架天平也保持平衡,那么“?”处应放 个■.18.一列方程如下排列:1142x x -+=的解是2x =; 2162x x -+=的解是3x =; 3182x x -+=的解是4x =; ⋯根据观察得到的规律,写出其中解是2020x =的方程: . 三、解答题19.解方程:(1)33(21)x x x +=--; (2)3210123x x --=-.20.小明解方程121224x x+--=+的过程如图,请指出他解答过程中所有错误步骤的序号,并写出正确的解答过程.21.已知方程30x +=与关于x 的方程63()12x x k x -+=-的解相同(1)求k 的值; (2)若|5|(1)0k m n ++-=求m n +的值.22.快车以200/km h的速度由甲地开往乙地再返回甲地,慢车以75/km h的速度同时从乙地出发开往甲地.已知当快车回到甲地时,慢车距离甲地还有225km,则(1)甲乙两地相距多少千米?(2)从出发开始,经过多长时间两车相遇?(3)几小时后两车相距100千米?23.某商场从厂家购进了A、B两种品牌足球共100个,已知购买A品牌足球比购买B品牌足球少花2800元,其中A品牌足球每个进价是50元,B品牌足球每个进价是80元.(1)求购进A、B两种品牌足球各多少个?(2)在销售过程中,A品牌足球每个售价是80元,很快全部售出;B品牌足球每个按进价加价25%销售,售出一部分后,出现滞销,商场决定打九折出售剩余的B品牌足球,两种品牌足球全部售出后共获利2200元,有多少个B品牌足球打九折出售?24.某水果销售店用1000元购进甲、乙两种水果共140千克,这两种水果的进价、售价如下表所示:进价(元/千克)售价(元/千克)甲种水果58乙种水果913(1)这两种水果各购进多少千克?(2)若该水果店把这两种水果全部售完,则可获利多少元.25.下表为某市居民每月用水收费标准.用水量x(立方米)水费到户价单价(元/立方米)低于或等于17的部分0.8a+高于17低于或等于31的部分 2.72a+(1)某户用水10立方米,共缴水费32元,求a的值;(2)在(1)的前提下,该用户5月份缴水费80元,请问该用户5月份用水多少立方米?26.综合与实践在数学综合与实践课上,老师以“出行方式的选择“为主题,请同学们发现和提出问题并分断和解决问题.问题情境随着互联网的普及和城市交通的多样化,人们出行的时间与方式有了更多的选择.某市有出租车.滴滴快车和神州专车三种网约车,收费标准见下图(该市规定网约车行驶的平均速度为40公里/时)问题一“奋进小组”提出的问题是:如果乘坐这三种网约车的里程数都是10公里.他们发现乘坐出租车最节省钱.费用为元;问题二“质疑小组”提出了两个问题,请从A,B两个问题中任选一问作答,A.从甲地到乙地,乘坐出租车比滴滴快车节省13.6元,求甲.乙两地间的里程数.B.神州专车和滴滴快车对第一次下单的乘客有如下优惠活动:神州专车收费打八折,另外加5.3元的空车费;滴滴快车超过8公里收费立减6.5元.如果两位顾客都是第一次下单.分别乘坐神州专车、滴滴快车且收费相同,求这两位顾客乘车的里程数.七年级数学寒假作业(二)参考答案一、选择题1.方程23x -=-的解是( ) A .5x =- B .5x = C .1x =- D .1x = 【分析】移项、合并同类项即可求解. 【解析】23x -=-, 32x =-+, 1x =-. 故选:C .2.解方程1124x x+-=,去分母,去括号得( )A .122x x -+=B .122x x --=C .422x x -+=D .422x x --= 【分析】方程两边乘以4去分母得到结果,即可作出判断.【解析】解方程1124x x+-=,去分母,去括号得42(1)x x -+=,即422x x --=.故选:D .3.下列等式变形正确的是( ) A .若42x =,则2x =B .若4223x x -=-,则4322x x +=-C .若4(1)32(1)x x +-=+,则4(1)2(1)3x x +++=D .若3112123x x +--=,则3(31)2(12)6x x +--=【分析】根据等式的性质即可解决.【解析】A 、若42x =,则12x =,原变形错误,故这个选项不符合题意;B 、若4223x x -=-,则4322x x +=+,原变形错误,故这个选项不符合题意;C 、若4(1)32(1)x x +-=+,则4(1)2(1)3x x +-+=,原变形错误,故这个选项不符合题意;D 、若3112123x x+--=,则3(31)2(12)6x x +--=,原变形正确,故这个选项符合题意; 故选:D .4.若1x =是方程20x a +=的解,则(a = ) A .1 B .2 C .1- D .2- 【分析】将1x =代入20x a +=即可求出a 的值. 【解析】将1x =代入20x a +=, 20a ∴+=, 2a ∴=-, 故选:D .5.已知关于x 的方程250x a -+=的解是2x =-,则a 的值为( ) A .2- B .1- C .1 D .2【分析】由2x =-是方程的解,故将2x =-代入原方程中,得到关于a 的方程,求出方程的解得到a 的值即可.【解析】由方程250x a -+=的解是2x =-, 故将2x =-代入方程得:2(2)50a ⨯--+=, 解得:1a =. 故选:C .6.一艘轮船在甲、乙两地之间航行,已知水流速度是5千米时,顺水航行需要3小时,逆水航行需要4小时,则甲乙两地间的距离是( ) A .120千米 B .110千米 C .130千米 D .175千米【分析】可根据船在静水中的速度来得到等量关系为:航程÷顺水时间-水流速度=航程÷逆水时间+水流速度,把相关数值代入即可求得航程. 【解析】设A 、B 两码头之间的航程是x 千米. 5534x x-=+, 解得120x =, 故选:A .7.如图,学校实验室需要向某工厂定制一批三条腿的桌子,已知该工厂有24名工人,每人每天可以生产20块桌面或300条桌腿,1块桌面需要配3条桌腿,为使每天生产的桌面和桌腿刚好配套,设安排x 名工人生产桌面,则下面所列方程正确的是( ) A .203300(24)x x =⨯- B .300320(24)x x =⨯- C .320300(24)x x ⨯=- D .20300(24)x x =-【分析】设安排x 名工人生产桌面,则安排(24)x -名工人生产桌腿,根据生产的桌腿数量是桌面数量的3倍,即可得出关于x 的一元一次方程,此题得解.【解析】设安排x 名工人生产桌面,则安排(24)x -名工人生产桌腿, 依题意,得:320300(24)x x ⨯=-. 故选:C .8.古埃及人的“纸草书”中记载了一个数学问题:一个数,它的三分之二,它的一半,它的七分之一,它的全部,加起来总共是33.若设这个数是x ,则所列方程为( )A .213337x x x ++=B .21133327x x x ++=C .21133327x x x x +++=D .21133372x x x x ++-=【分析】根据题意列方程21133327x x x x +++=.【解析】由题意可得21133327x x x x +++=.故选:C .9.规定一种新运算:22a b a b =-⊗,若2[1()]6x -=⊗⊗,则x 的值为( ) A .1- B .1 C .2 D .2-【分析】首先根据题意,可得:21()12()12x x x -=-⨯-=+⊗,所以2(12)6x +=⊗,所以222(12)6x -+=;然后根据解一元一次方程的方法,求出x 的值为多少即可. 【解析】22a b a b =-⊗,21()12()12x x x ∴-=-⨯-=+⊗, 2[1()]6x -=⊗⊗, 2(12)6x ∴+=⊗,222(12)6x ∴-+=,去括号,可得:4246x --=, 移项,可得:4642x -=-+, 合并同类项,可得:44x -=, 系数化为1,可得:1x =-. 故选:A .10.代数式25ax b +的值会随x 的取值不同而不同,如表是当x 取不同值时对应的代数式的值,则关于x 的方程254ax b +=-的解是( )x 4- 3- 2- 1-0 25ax b + 12 8 4 0 4-A .12B .4C .2-D .0 【分析】根据表格中的数据确定出a 与b 的值,代入方程计算即可求出解. 【解析】根据题意得:250a b -+=,54b =-,解得:2a =-,45b =-,代入方程得:444x --=-, 解得:0x =, 故选:D . 二、填空题11.已知方程240x -=,则x = . 【分析】直接移项、系数化为1即可. 【解析】240x -=, 24x =, 2x =,故答案为:2.12.关于x 的方程253x a +=的解与方程220x +=的解相同,则a 的值是 . 【分析】利用一元一次方程的解法解出方程220x +=,根据同解方程的定义解答. 【解析】解方程220x +=, 得1x =-,由题意得,253a -+=, 解得,1a =, 故答案为:1.13.某下水管道工程由甲、乙两个工程队单独铺设分别需要10天,15天完成.如果甲队先单独施工5天,然后由甲、乙两队共同施工完成整个工程,则还需多少天?若设还需天数为x 天,则可列方程为 .【分析】由甲、乙两队共同施工,设还需x 天完成,题中的等量关系是:甲工程队5天完成的工作量+甲、乙两队工程队x 天完成的工作量1=,依此列出方程即可.【解析】甲队完成所有工程需要10天,所以甲队先施工5天完成了所有工程的一半,所以111()10152x +=,所以111()121015x ++=.故答案是:111()121015x ++=.14.姐姐比弟弟大3岁,若5年前姐姐的年龄是弟弟的2倍,则姐姐现在的年龄是 岁. 【分析】设姐姐现在的年龄是x 岁,则弟弟现在的年龄是(3)x -岁,根据5年前姐姐的年龄是弟弟的2倍,即可得出关于x 的一元一次方程,解之即可得出结论.【解析】设姐姐现在的年龄是x 岁,则弟弟现在的年龄是(3)x -岁, 依题意得:52(35)x x -=--, 解得:11x =. 故答案为:11.15.如果10.20.3x y+=,那么101023x y += . 【分析】根据等式的性质解决此题.【解析】10.20.3x y +=, ∴1010()10.20.31010x y +⨯=⨯. ∴1010123x y +=.故答案为:1.16.已知1x =是关于x 的方程(26)20m x --=的解,则m = . 【分析】把1x =代入(26)20m x --=,求出m 的值. 【解析】把1x =代入(26)20m x --=, 得2620m --=, 262m =+, 解得4m =. 故答案为:4.17.假设“▲、●、■”分别表示三种不同的物体.如图,前两架天平保持平衡,如果要使第三架天平也保持平衡,那么“?”处应放 个■.【分析】根据等式的性质解决此题.【解析】设“▲、●、■”的质量分别是x 、y 、z . 由题意得:x y z =+,2x z y +=. 22y z y ∴+=. 2y z ∴=. 36y z ∴=.∴要使第三架天平也保持平衡,那么“?”处应放6个■. 故答案为:6.18.一列方程如下排列: 1142x x -+=的解是2x =; 2162x x -+=的解是3x =; 3182x x -+=的解是4x =; ⋯根据观察得到的规律,写出其中解是2020x =的方程: . 【分析】先根据已知方程得出规律,再根据得出的规律得出即可. 【解析】一列方程如下排列: 1142x x -+=的解是2x =; 2162x x -+=的解是3x =; 3182x x -+=的解是4x =; ∴一列方程如下排列: 11222x x -+=⨯的解是2x =;21232x x -+=⨯的解是3x =; 31242x x -+=⨯的解是4x =; ⋯∴20191220202x x -+=⨯, ∴方程为2019140402x x -+=,故答案为:2019140402x x -+=.三、解答题 19.解方程:(1)33(21)x x x +=--;(2)3210123x x --=-. 【分析】(1)(2)按解一元一次方程的一般步骤,求解即可. 【解析】(1)去括号,得3321x x x +=-+, 移项,得3213x x x -+=-, 合并同类项,得42x =-,系数化为1,得12x =-;(2)去分母,的3(3)62(210)x x -=--, 去括号,得396420x x -=-+, 移项,得346209x x +=++ 合并,得735x =, 系数化为1,得5x =.20.小明解方程121224x x+--=+的过程如图,请指出他解答过程中所有错误步骤的序号,并写出正确的解答过程.【分析】根据解一元一次方程的方法和步骤进行解答即可得解. 【解析】错误步骤的序号为:①、②、③. 正确解答过程如下: 121224x x+--=+2(1)14242x x +-⨯=⨯+- 22482x x +-=+- 28224x x +=+-+ 312x = 4x =.21.已知方程30x +=与关于x 的方程63()12x x k x -+=-的解相同(1)求k 的值;(2)若|5|(1)0k m n ++-=求m n +的值. 【分析】(1)解方程30x +=,得x 的值,把x 的值代入方程63()12x x k x -+=-,求出k 的值; (2)把k 的值代入,根据非负数的和为0,先求出m 、n 的值,再求m n +. 【解析】(1)由30x +=,得3x =-, 把3x =-代入63()12x x k x -+=-, 得6(3)3(3)312k ⨯---+=--, 整理,得36k =, 解得2k =. (2)2k =, 2|5|(1)0m n ∴++-=|5|0m +,2(1)0n - 50m ∴+=,10n -=. 5m ∴=-,1n =. 514m n +=-+=-.22.快车以200/km h 的速度由甲地开往乙地再返回甲地,慢车以75/km h 的速度同时从乙地出发开往甲地.已知当快车回到甲地时,慢车距离甲地还有225km ,则 (1)甲乙两地相距多少千米?(2)从出发开始,经过多长时间两车相遇? (3)几小时后两车相距100千米? 【分析】(1)设甲、乙两地相距x 千米,根据时间=路程÷速度结合两车相同时间内行驶的路程间的关系,即可得出关于x 的一元一次方程,解之即可得出结论; (2)设经过y 小时两车相遇,分两车第一次相遇及两车第二次相遇两种情况考虑,根据路程=速度⨯时间,即可得出关于y 的一元一次方程,解之即可得出结论;(3)设t 小时后两车相距100千米,分两车第一次相距100千米、第二次相距100千米、第三次相距100千米、第四次相距100千米及第五次相距100千米五种情况考虑,根据两车行驶的路程之间的关系,即可得出关于t 的一元一次方程,解之即可得出结论. 【解析】(1)设甲、乙两地相距x 千米,依题意,得:222520075x x -=, 解得:900x =.答:甲、乙两地相距900千米. (2)设经过y 小时两车相遇. 第一次相遇,(20075)900y +=,解得:3611y =;第二次相遇,20075900y y -=,解得:365y =.答:从出发开始,经过3611或365小时两车相遇.(3)设t 小时后两车相距100千米.第一次相距100千米时,20075900100t t +=-,解得:3211t =;第二次相距100千米时,20075900100t t +=+,解得:4011t =; 第三次相距100千米时,20075900100t t -=-,解得:325t =;第四次相距100千米时,20075900100t t -=+, 解得:8t =; 第五次相距100千米时,75900100t =-,解得:323t =. 答:经过3211,4011,325,8或323小时后两车相距100千米. 23.某商场从厂家购进了A 、B 两种品牌足球共100个,已知购买A 品牌足球比购买B 品牌足球少花2800元,其中A 品牌足球每个进价是50元,B 品牌足球每个进价是80元. (1)求购进A 、B 两种品牌足球各多少个? (2)在销售过程中,A 品牌足球每个售价是80元,很快全部售出;B 品牌足球每个按进价加价25%销售,售出一部分后,出现滞销,商场决定打九折出售剩余的B 品牌足球,两种品牌足球全部售出后共获利2200元,有多少个B 品牌足球打九折出售? 【分析】(1)设购进A 品牌足球x 个,则购进B 品牌足球(100)x -个,根据“购买A 品牌足球比购买B 品牌足球少花2800元”可列出方程求解即可.(2)设有y 个B 品牌足球打九折出售,根据题意列出方程解决问题. 【解析】(1)设购进A 品牌足球x 个,则购进B 品牌足球(100)x -个, 根据题意,得80(100)502800x x ⨯--=,解得40x =.10060x -=. 答:购进A 品牌足球40个,则购进B 品牌足球60个; (2)设有y 个B 品牌足球打九折出售,根据题意,得(8050)408025%(60)[80(125%)90%80]2200y y -⨯+⨯⨯-+⨯+⨯-=. 解得20y =.答:有20个B 品牌足球打九折出售.24.某水果销售店用1000元购进甲、乙两种水果共140千克,这两种水果的进价、售价如下表所示:进价(元/千克) 售价(元/千克)甲种水果5 8 乙种水果9 13 (1)这两种水果各购进多少千克?(2)若该水果店把这两种水果全部售完,则可获利多少元. 【分析】(1)设购进甲种水果x 千克,则购进乙种水果(140)x -千克,根据表格中的数据和意义列出方程并解答;(2)总利润=甲的利润+乙的利润. 【解析】(1)设购进甲种水果x 千克,则购进乙种水果(140)x -千克,根据题意得:59(140)1000x x +-=,解得:65x =,14075x ∴-=.答:购进甲种水果65千克,乙种水果75千克; (2)(85)65(139)75495-⨯+-⨯=(元) 答:利润为495元.25.下表为某市居民每月用水收费标准.用水量x (立方米) 水费到户价单价(元/立方米)低于或等于17的部分0.8a + 高于17低于或等于31的部分2.72a + (1)某户用水10立方米,共缴水费32元,求a 的值;(2)在(1)的前提下,该用户5月份缴水费80元,请问该用户5月份用水多少立方米? 【分析】(1)根据题意列出方程10(0.8)32a +=,进而求出即可; (2)首先判断得出17x >,进而表示出总水费,进而得出即可. 【解析】(1)10(0.8)32a +=,解得 2.4a =; (2)17(2.40.8)54.480⨯+=<,设该用户5月份用水x 米3,依题意有17(2.40.8)(17)(2.4 2.72)80x ⨯++-⨯+=,解得22x =. 答:该用户5月份用水22立方米. 26.综合与实践在数学综合与实践课上,老师以“出行方式的选择“为主题,请同学们发现和提出问题并分断和解决问题. 问题情境随着互联网的普及和城市交通的多样化,人们出行的时间与方式有了更多的选择.某市有出租车.滴滴快车和神州专车三种网约车,收费标准见下图(该市规定网约车行驶的平均速度为40公里/时)问题一“奋进小组”提出的问题是:如果乘坐这三种网约车的里程数都是10公里.他们发现乘坐出租车最节省钱.费用为 元; 问题二“质疑小组”提出了两个问题,请从A ,B 两个问题中任选一问作答,A .从甲地到乙地,乘坐出租车比滴滴快车节省13.6元,求甲.乙两地间的里程数.B .神州专车和滴滴快车对第一次下单的乘客有如下优惠活动:神州专车收费打八折,另外加5.3元的空车费;滴滴快车超过8公里收费立减6.5元.如果两位顾客都是第一次下单.分别乘坐神州专车、滴滴快车且收费相同,求这两位顾客乘车的里程数. 【分析】问题一:根据出租车的收费标准解答;问题二:A 、设甲、乙两地间里程数为x 公里,分3x 和3x >两种情况列出方程并解答; B 、设两位顾客的里程数为x 公里,分8x 和8x >两种情况,分别列出方程并解答. 【解析】问题一:14 2.4(103)30.8+⨯-=(元) 问题二:A 解:设甲、乙两地间里程数为x 公里①若603,12 2.50.41413.640x x x ++⨯=+ 解得:15631x =(舍) ②若3x >,6012 2.50.414 2.4(3)13.640xx x ++⨯=+-+解得:12x =答:甲、乙两地间里程数为12公里B . B 解:设两位顾客的里程数为x 公里①若8x ,60600.8(10 2.80.5) 5.312 2.50.44040x xx x ++⨯+=++⨯解得:5x = ②60608,0.8(10 2.80.5) 5.312 2.50.4 6.54040x xx x x >++⨯+=++⨯-解得:30x =答:两位顾客的里程数为5或30公里.。
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2012英语寒假作业阶段性检测二第一部分:课文经典句型再现(2册)1._____ _______(作为回报), the Czar sent him a troop of his best soldiers.2.There was a time_____ the two countries _______ ____ ________ .那时两国正在交战。
3.After that,______ ________ _____ the Amber Room _______ ____ mystery.琥珀屋发生了什么事依然是个谜。
4._______ _____ ______ ________ _______(毫无疑问)the boxes were put on a train for Konigsberg.5.I think those who find the Amber Room should decide_______ ______ _______ _______ _____(如何处理它)。
6.What do the five rings on the Olympic flag ________ _________(代表).7.Only athletes who have reached the agreed standard for their event will _______ ________ ________ (被接受为) competitors.8.Would you like to be _______ _______ _______ (管理负责)the firm when I’m away?9.No other countries could join in, _______(也不)could slaves or women!10._____ ____ ________ _____ _______ (事实上), every country wants the opportunity.11.In this way you will _________ ______ _________ ____ (变得更加自信)speaking English.12.______ _______ ______ _______ (随着时间的推移),I was made smaller.13.By the time I was sixteen, ______ _________ _________ ________(我的梦想成真了)。
14.________ _______ (毕竟;别忘了), _____ ______ _______ ____ (在…的帮助下) my electronic brain which never forgets anything, using my intelligence is what I am all about!15.As a result, these endangered animals may _______ _______ (灭绝)。
16.In relief, Daisy burst into laughter.(翻译) ____________________________________________17.Dinosaurs lived on the earth tens of millions of years ago, long before humans _______ _____ _______ (出现)。
18.说实话,很多人把名和利看得很重。
____ ____ ________, a lot of people _______ _______ __________ ____ becoming rich and famous.19.The musicians were to ______ _______ _____(取笑) each other as well as play music, most of which _____ ______ loosely ____ (基于) the Beatles.20.The band ______ _____ (解散) about 1970, but happily reunited in the mid-1980s.第二部分:能力提升ADEAR AMY: Last year I got a full-time job as a baby-sitter for a wonderful family with two amazing kids. They have come to treat me as one of their own. But my boyfriend and I are attempting to save much more money for the life we want to build, including marriage, a house and kids. Much as I love my ―babies,‖ I’m looking forward to beginning a challenging career in a big company. Should I tell the family that I am looking for a new job? I don’t want to find one that requires me to begin work immediately, leaving them without child care, but I also don’t want them to assume that I’m leaving right away.Up-in-the-Air Au PairDEAR AU PAIR: Whatever your arrangement, it is reasonable for them to expect you to be honest and to keep them in the loop. They see that you are making changes in your life, and surely they will also understand your desire to advance in a career. Tell them frankly and they should be happy to employ you as long as you are available.Amy DEAR AMY: I am a freshman in a high school. Last summer my best friend was diagnosed with skin cancer. It isn’t very serious, but she seems to be becomin g more and more depressed. How can I help her be happy again?Best Friend DEAR FRIEND:Your best role is to prop up and encourage your friend when she seems down, and to be supportive and kind to her. You're doing a great job with that, and your friend is lucky to have you in her life.Amy21.What is Au Pair’s problem according to the first paragraph?A. She has no idea whether to tell the family her plan or not.B. She has no idea whether the family will hate her or not.C. She has no idea where to find a new good job.D. She has no idea how to save more money.22.From the underlined phrase― to keep them in the loop‖, we can infer that Amy advises Au Pair_____.A. to keep it secret to the familyB. to cheat the family for the time beingC. to tell her true impression of the familyD. to let the family know what’s going on23. In which column of a newspaper can we probably find the passage?A. JobsB. cultureC. LifeD. EntertainmentBWhen someone says ―SHARK‖ most people think of a big, toothy, underwater animal; basically we are imagining a Great White. In fact sharks come in all shapes, sizes and even colors! Follow me please; I’d like to show you a very special small shark commonly known as horn sharks, only found in the coastal waters of north-west North America.Look at this shark, and you can easily see the horns on it and you will know the reason why it is called the horn shark is that it has the broad, flattened head and two large horn-like spines(脊椎) found behind its eyes and makes it one of the hardiest of all shark species. What makes it unique is that as its enemy attempts to swallow it, the spines on its back will stick into the enemy’s mouth and give a good chance for it to get away.The horn shark is brown in color with black spots all over its body. The adults can reach up to a length of 4 feet and weigh up to 10 kg. An interesting fact about the horn shark is that it has five gills(鳃). The horn shark is a clumsy swimmer using its flexible pectoral fins(胸鳍)to push itself along the bottom of the ocean. The maximum distance that has ever been recorded for a horn shark to have traveled out from its habitat is 10 miles.Today, as so little is known about its population off the Californian coast, they have been listed as being ―Data Deficient‖ in the World Conservation Union. The horn shark is being threatened both by water pollution and commercial fishing in the area. Though they are not among those sea creatures hunted primarily for food, but they often get caught as a by-catch in fishing expeditions.24.The horn shark gets its name for______.A. its small sizeB. its large eyesC. its two large spinesD. its brown color with spots25.How is paragraph 3 mainly developed?A. By giving descriptionsB. By following time orderC. By analyzing causesD. By making comparisons26.Which factors contribute to the horn shark’s being on the ―Data Deficient‖ list?①That people like hunting them for pets ②That people fish them for fun③Water pollution off the coast ④Knowing little about themA. ①②B.②③C. ①④D.③④27. According to the passage, all of the following are unique to the horn shark EXCEPT that_____.A. it doesn’t travel farB. it is good at swimmingC. its spines can be used to attack the enemy and escapeD. it is only found in the coastal waters of north-west North AmericaCSixty-five million years ago, an asteroid (小行星) that crashed on Earth led to the disappearance of the largest animals that have ever walked our planet – the dinosaurs. At least, this is what some scientists believe. But that accident happened so long ago. People have come to believe that we are free of threats from asteroids and everything else from space.However, what happened on Feb 15 , 2013 was a reminder that we’re just as vulnerable as the dinosaurs once were. Two objects from space – a meteor (陨石) and an asteroid called 2012 DA14 –visited Earth’s atmosphere on the same day. The former fell in Russia, injuring 1,200 people, while the latter passed by Earth at a record-setting close distance.Scientists had been expecting the asteroid since last year, but the meteor was a surprise. NASA’s telescope system only detects asteroids at least 50 meters in diameter (直径), which is just about the size of 2012 DA14. But the meteor was much smaller, which made it harder to spot.But what if we do spot an asteroid that is headed right for Earth? There are several possible ways in which dangerous asteroids could be made to change its orbit. Which method is best depends on several factors and most importantly –how much time we have to stop it.If there is enough time before the hit, we can send off a heavy spacecraft to travel alongside the asteroid. The gravity from the spacecraft would gradually change the rock’s orbit. Besides that, scientists could one day use sun-powered lasers to either make asteroids disappear or change their course. If there’s not enough time, we’ll have to go after the asteroid with a spacecraft and change its orbit with a crash. Finally, if things are truly desperate, there will be only one choice left –to use a nuclear bomb. That could turn the asteroid into a meteor shower, which would be even more dangerous.28.The author mentioned the asteroid that led to the dinosaurs’ dying out to ______.A. show that asteroids fall from space frequentlyB. alert people about the possible danger of objects falling from spaceC. inform readers about the constant threats the Earth facesD. suggest that there are still many mysteries about the universe29.The underlined word ―vulnerable‖ in the second paragraph probably means ______.A. unprotectedB. lonelyC. stupidD. self-important30.Which of the following statements is TRUE about the meteor that fell to the Earth in Russia?A. It passed by the Earth at a close distance.B. It was spotted by NASA’s telescope system a year ago.C. It is about the same size as the asteroid that passed by the Earth.D. It fell to the Earth and caused great damage to the local community.31.What is the main idea of the article?A. Learning about asteroids and meteors.B. The threats of objects from space and possible solutions.C. NASA’s latest technology to discover visitors to the Earth from space.D. How to measure the damage of collisions from asteroids and meteors.DAn estimated 80 percent of American adults think music lessons, though at times boring and challenging in the eyes of some kids, improve children’s ability to learn or their performance in school . They say that the satisfaction for learning to play a new song helps a child express creativity.Researchers at Harvard University , however, have found that there’s one thing musical training does not do. Samuel Mehr, the leading researcher of the new study, said it is wrong to think that learning to play a musical instrument improves a child’s intellectual development. The evidence comes from studies that measured the mental ability of two groups of 4-year-olds and their parents. One group attended music class; the comparison group went to a class that places importance on the optical arts-arts that can be seen.―We found no evidence for any advantage on any of the se tests for the kids participating in these music classes,‖ said Mehr.Samuel Mehr says researchers have carried out many studies in an effort to learn whether musical training can make children smarter. Only one study seems to show a small percentage increase in IQ, intellectual scores among students after one year of music lessons.He does not believe that IQ is a good measure of a child’s intelligence. Therefore, the researchers in his study compared how well children in the musical training group did on mental processing tasks, then the results were compared to those of children who did not take lessons.Music lessons may not offer children a fast easy way to gain entry to the best schools later of their life, but the training is still important.Mr Mehr notes that the works of writer William Shakespeare are not taught , so the children will do better in physics. He says Shakespeare is taught because it is important for cultural reasons.―And I don’t think music needs to be any different than that.‖32. What attitude do most American grown-ups have towards music lessons?A. UninterestedB. ApprovingC. DoubtfulD. Uncertain33. The underlined word ―optical‖ in Paragraph 2 probably means .A. visualB. colorfulC. traditionalD. serious34. According to Samuel Mehr,_________ .A. many studies show that music training can improve IQB. IQ is a good measure of a chi ld’s intelligenceC. music can enable a child to go to a better schoolD. music should be taught for cultural reasons35. The study shows that .A. early music training has negative effectsB. musical lessons should be stopped at schoolC. musical tr aining doesn’t improve kids’ intelligenceD. playing musical instrument makes kids more creative第二节(共5小题;每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。