寒假作业2--填空
幼儿园下学期寒假作业题二
幼儿园下学期寒假作业题二
一、第一部分(语文）
1、小朋友，看到下面的情景需要拨打哪个电话？请将电话号码写在图片的下面
2、照样子写字：
3、楷体按顺序填一填。
4、写字基础：
5、我会写
6、写出6个单韵母
二、数学（简单易会）
1、用凑十法做一做。
2、20以内加减混合练习
3、凑十法练习题
4、写出下面的相邻数。
5、有10名小朋友比赛跑步，跑在前面的有2名，落在后面的有5名，跑在中间位置的有（）名？
6、解决问题（先说说题目的意思，再列式计算）：
三、语文（难度高）
1、我会写
四、第四部分(拼音）
1、把下面的声母变成整体认读音节。
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。
河北省冀州中学2021届高三（二轮复习）生物寒假作业2
高三生物假期作业2一、单选题1．从一动物细胞中得到两类大分子有机物x、y，已知细胞中x的含量大于y，用胃液处理，x被分解而y不变。
x含有化学元素N，有的还含有元素S，y含有化学元素N和P，它们与苏丹Ⅲ染液都没有颜色反应，细胞膜上有x而无y。
下列有关x、y的叙述，错误的是( ) A．x可能是蛋白质B．y的基本组成单位可能是核苷酸C．细胞膜上的x可能是胆固醇D．y一般在于细胞核和细胞质中2．下列关于细胞知识的叙述，正确的是①核仁是与核糖体形成有关的细胞器；②细胞学说揭示了“细胞为什么要产生新细胞”；③硝化细菌、霉菌、颤藻的细胞都含有核糖体、DNA 和 RNA；④胆固醇、性激素、维生素 D 都属于固醇；⑤蛙红细胞、人肝细胞、洋葱根尖分生区细胞并不都有细胞周期，但这些细胞内的化学成分都不断更新A．③④⑤B．①③④C．②③④D．②④⑤3．下列有关生命的物质基础和结构基础的阐述，不正确的是：（）A．C、H、O、N、P是ATP、染色质、质粒、NADPH共有的化学元素B．糖蛋白、抗体、RNA聚合酶、限制性内切酶都是具有识别作用的物质C．线粒体、核糖体、质粒、酶等结构或物质中肯定不含有核糖参与组成的是酶D．假设某基因在控制合成两条多肽链的过程中，产生的水分子数为a，则组成该基因的碱基个数至少为（6a+12）4．下列有关细胞中分子的叙述，正确的是（）A．蛋白质、核酸和多糖分别以氨基酸、核苷酸和葡萄糖为单体组成多聚体B．葡萄糖是细胞呼吸最常利用的物质，它可来自于动物细胞内麦芽糖的水解C．在人体心肌细胞中由A、G、T、U四种碱基参与构成的核苷酸最多有7种D．有氧呼吸过程中产生的还原型辅酶Ⅰ可与02结合生成水，其组成元素有C、H、O、N、P 5．关于细胞中常见的化合物，说法错误的是( )A．糖类都是能源物质，检测糖类常用斐林试剂B．一切生命活动都离不开蛋白质，蛋白质是生命活动的主要承担者，检测蛋白质常用双缩脲试剂C．脂肪是良好的储能物质，在植物、动物细胞中都可以存在，检测时常用苏丹Ⅲ或Ⅳ染液D．核酸是细胞内携带遗传信息的物质，刑侦人员可以将案发现场得到的血液、头发等样品中提取的DNA，与犯罪嫌疑人的DNA进行比较，以提供证据6．图为几种化合物的元素组成示意图，以下说法错误的是（）A．若①为某种具有催化作用的化合物，则其水解产物为氨基酸B．若②为脂肪，则其大量积累于皮下和内脏器官周围C．若③为蓝藻的遗传物质，则其和蛋白质组成染色体D．若④为糖原，则其主要分布在人和动物的肌肉和肝脏中7．从一动物细胞中得到两类大分子有机物x、y，已知细胞中x的含量大于y，用胃液处理，x被分解而y不变。
七年级英语冀教版 寒假作业(2)
寒假作业（2）一、单选题1.—_____is your mum?—She is fine. Thank you.A. WhereB. HowC. WhatD. Who2.—Is her name Kate?—_____.A. Yes, she isB. No, she isn'tC. Yes, it'sD. No, it isn't3.I have _____ eraser and five _____ in my pencil box.A. a; pencilsB. a; pencilC. an; pencilsD. an; pencil4.—_____ that an English girl?—_____, she's a Chinese girl.A. Is; YesB. Is; NoC. Are; NoD. Are; Yes5.—Sandy, is Mr. Li in the teachers' office now?—I am not sure. He _____ be there.A. mustB. can'tC. mustn'tD. may6.The students do experiments(实验) in the _____. They learn a lot there.A. playgroundB. labC. libraryD. office7.The boy is from _____. He's _____.A. Chinese; ChinaB. China; ChineseC. Chinese; ChineseD. China; China8.—______ going shopping tomorrow?—Good idea.A.How aboutB.WhatC. What'sD.How9.Six and four is _______.A. nineB.tenC. elevenD. twelve10.—Sally, what about going to the classroom?—_________.A. You're welcomeB. Nice to meet youC. Have a good dayD. That sounds good二、连词成句1.is, classmate, my, Nick______________________________________.2.to, welcome, class, our______________________________________3.she, from, is, Japan, not______________________________________4.very, thank, much, you______________________________________!5.from, are, Shanghai, you____________________________________________?三、完形填空Hello! 1 name is Li Ying. I'm twelve. I'm from Kunming. Now I'm in Beijing No.14 Middle School. I'm 2 Class Five, Grade Seven. Miss Gao 3 my English teacher. She is 4 old teacher. I have a pen, a ruler and two 5 in my pencil box. Liu Ping is in Grade Seven, too. 6 is from Guangzhou. She is my good 7 . We are in 8 same class. Now she can 9 English well. I think she is a good girl. Look! 10 is that? She is Liu Ping.1.A.I B.My C.Your D.Me2.A.from B.to C.not D.in3.A.is B.are C.am D.be4.A.a B.an C.good D./5.A.buses B.desks C.schoolbags D.pencils6.A.He B.His C.She D.Her7.A. friend B. teacher C. student D.mom8.A.these B.the C.an D.a9.A. spell B. speak C.help D.see10.A. How B.What C.Where D.Who四、阅读理解Tom and Tony are classmates. Tom is 12 and Tony is 13 years old. They are in Class 3, Grade 7 in No.33 Middle School.One day, they can't write their names well. Their English teacher Mr. Green is angry(生气的) with them. He asks them to write their names a hundred times(一百遍). Tony cries(哭). The teacher says, "Why are you crying?"Tony says, "Tom's name is Tom Hill. He can finish writing his name1.How old is Tom?A.10.B.11.C.12.D.13.2.Which class is Tony in?A.Class One.B.Class Two.C.Class Three.D.Class Seven.3.Why is their English teacher angry with them?A.They are late for class.B.They can't do their homework.C.They can't write their names well.D.They can't read their names well.4.What does Tony do after Mr. Green asks him to write his name a hundred times?A.He is happy.B.He cries.C.He goes home.D.He writes well.A.I am slow.B.Tom is fast.C.His name is too long.D.But my name is too long.五、写作假如你是Peter,你很想用英文给你的网友Jack写一封信来介绍你的初中生活,请根据思维导图完成信件。
二年级语文寒假作业
寒假作业（一）日期：2月3日家长批改并签字：一、看拼音写词语，字要写漂亮哦！dùpí nǎ li piāo fú zāi hài（）（）（）（）wá wa rúguǒzhī shi bàn fǎ（）（）（）（）二、按课文内容填空。
1．平时我在池子里______，在小溪里______，在江河里______，在海洋里______，______，________。
2．有时候我很_______，有时候我很_______。
我做过许多好事，_____________，__________，帮助人们工作。
我也做过许多坏事，_____________，_____________，给人们带来灾害。
3．我会变，太阳一晒，我就变成____。
升到天空，我又变成____，在空中漂浮着。
碰到冷风，我会变成____、______或____落下来。
你们猜我是什么我就是______。
三、选字填空。
那哪1．你去( )里2．( )是我们的学校。
已以3．你( )经是一年级的小学生了。
4．( )前，你家住在哪里四、照样子写词语。
许许多多高高兴兴进进出出_________ _________ _________五、读句子，再用带点的词语写句子。
1．孩子如果已经长大，就得告别妈妈，四海为家。
已经：__________________________________________________________。
2、蒲公英妈妈准备了降落伞，把它送给自己的娃娃。
准备：__________________________________________________________。
3只要有风轻轻吹过，孩子们就乘着风纷纷出发。
纷纷：__________________________________________________________。
七、组词。
飘( ) 晒 ( ) 池( ) 浮( )灾( ) 害 ( ) 黑( ) 器( )带( ) 片 ( ) 极( ) 更( )八、按课文内容填空。
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。
二年级数学寒假作业
二年级数学寒假作业（一）一、填空。
【33分】1. 一只青蛙有4条腿，9只青蛙有（）条腿。
2.36根小棒，把它平均分成4份，每份是（）根。
如果每份6根，能分（）份。
3. 5元5角=（）角1米-20厘米=（）厘米28角=（）元（）角4.8﹢8﹢8﹢8=（）×（）=（）6﹢6﹢6﹢6﹢6+ 6=（）×（）=（）5、4个8相加，写成加法算式是（），写成乘法算式是（）。
6、有15个苹果，每次吃掉3个，（）次能吃完。
7、（）里最大能填几？（）×7＜33 4×（）＜28 50＞（）×98.画一画第一行:第二行:第一行的个数是第二行○的2倍,第二行有( )个○。
9.把下列乘法口诀填写完整。
( )七四十二七八（）（）四十八四（）二十八10．想一想，填一填，算一算。
（8分）□×□＝□×□＝36 □÷□＝□÷□＝7□×□＝□×□＝24 □×□＝□÷□＝9二、选择。
【6分】1.杨树有8棵，柳树的棵树是杨树的4倍，柳树有几棵？正确的是（）A.4×8=32棵B.4+8=12棵C.32÷4=8棵D.42÷8=4棵2、一盒铅笔，平均分给3个小朋友，每个小朋友可以分到3支。
（）？A、还剩几支铅笔B、一共有几支铅笔C、一共有几个小朋友3、29名家长开家长会，每个长条凳能坐3人,需要（）个长条凳。
A 、8B 、9 C、10三、计算【32分】1.直接写得数。
【20分】5×8= 24÷8= 6×6= 36-6= 81÷9=7×7= 42-7=72÷8= 48÷6= 24÷6= 9×7= 8×4=14÷2= 36+48=64÷8= 27+9= 7×6= 20÷4= 35÷5= 9×32.在○里填上“>、<或=”。
2020年新目标英语八年级上册寒假作业二(含答案)
2020年新目标英语八年级上册寒假作业一、单项选择1. He gets up early but late.A. always; sometimesB. always; oftenC. often; alwaysD. usually; sometimes2. — Peter, you got to school by taxi?— Oh, I take a taxi to school, but my bike needs repairing today.A. usuallyB. sometimesC. neverD. seldom3. Here comes the train. Let’s _______ .A. to get it onB. to get on itC. get it onD. get on it4. What a________ lesson! I really get_______ with it．A. bored; boredB. boring; boringC. bored; boredD. boring; bored5. —Do you use ________ Internet to study?—Yes, I use it once ________ week.A. the; theB. the; /C. the; aD. a; a6. I help my mother ________ the housework.A. onB. inC. byD. with7. —What does Nancy usually do after school?—________.A. She has piano lessons on MondayB. She usually goes runningC. Her favorite sport is runningD. She runs fast8. — How often does your brother use the Internet?— .A. Last weekB. Twice a weekC. About a weekD. One week9. — do you have PE lessons?— Three times a week.A. How longB. How soonC. How manyD. How often10. One thing that is inexpensive in Paris, , is the wine.A. thoughB. whateverC. howeverD. but11. I think the best way _____ is playing basketball with friends.A. relaxB. to relaxingC. to relaxD. relaxing12. Only ten percent of the students ____ their mother with the housework after school.A. helpB. helpsC. helpingD. to help13. .—Does your brother often do exercise?—_____.So he is very strong and healthy.A. Yes，he isB. No，he isn'tC. Yes，he doesD. No，he doesn't14. .Watching TV too much ________ our study.A. is good forB. is bad forC. is good atD. is good to15. You can't ________， or you will feel tired.A. get up earlyB. stay up lateC. play sportsD. do exercise二、完形填空Mr. White is a very rich man. He___16___delicious food. He had a___17___cook, Mr. Black. The man could cook all kinds of food. His wife asked him to___18___her last month. Now she thinks she’s good at cooking and doesn’t want Mr. Black to___19___for them any longer(不再).Now Mrs. White begins to cook for her___20___. But Mr. White does not like her food at all. He says he won’t___21___any food at home if she doesn’t stop cooking. The woman says she’ll___22___another cook. The man has to wait.This morning Mr. White broke a window in a shop. They took him to the___23___. The policeman said, “I’m sorry to tell you, Mr. White. Or I’ll fine (罚款)you ten dollars, or you’ll stay in prison(监狱).___24___do you want?“I’ll stay in prison.” Answered the rich man.“___25___?”“Because my wife will find a new cook in ten days!”16. A. knows B. likes C. hears D. sees17. A. young B. strong C. good D. bad18. A. teach B. show C. study D. fry19. A. sing B. play C. write D. work20. A. farm B. class C. family D. shop21. A. read B. buy C. sell D. eat22. A. look for B. listen to C. ask D. call23. A. bus station B. police station C. post office D. middle school24. A. When B. Which C. What D. Who25. A. How B. Which C. Where D. Why三、阅读理解AEveryone knows exercise is important.We all need to exercise.Doctors say it's good for us.It keeps our body strong.When the daytime comes, we must get up.This is the time for exercise.Exercise means (意味着) doing things with the body.There're many ways to exercise.You can walk, run, swim, skate, or play ball games.Make sure you exercise in the following ways: You have to like the sport.Exercise enough—but not toomuch.It's good to exercise twice a week.Thirty minutes each time is enough.Try all kinds of things until you find one, two or three sports that are right for you.Exercising can be fun.Friends can exercise together at a fitness__center,__or they can play sports together.26. In the passage the writer tells us we all need to ________.A. drinkB. sleepC. exerciseD. work27. What does exercise mean?A. Doing things with the body.B. Studying.C. Having classes.D. Playing.28. Which of the following sports can't we find in the passage?A. Fishing.B. Running.C. Swimming.D. Walking.29. What can exercise do for us?A. It can make the body weak.B. It can make the body healthy.C. It can make us ill.D. It can make us sleep more.30. The underlined (加下划线的) words “fitness center” mean ________.A. 商务中心B. 健身中心C. 购物中心D. 医疗中心BLittle Peter is a boy of nine. He began to go to school the year before last and now he's in Grade Three. He lives not far from the school but he's often late for class. He likes watching TV in the evening and goes to bed late, so hecan't get up on time in the morning.This term Mrs Black, Peter's aunt, works in Peter's school. he teaches Grade Three maths. he's strict with Peter and often tells the boy to obey(遵守) the school rules and come to school on time. Yesterday morning Peter got up late. When he hurried to school, it was a quarter past eight. His aunt was waitingfor him at the school gate.“You're ten minutes late for the first class, Peter.” Mrs Black said angrily. “Why are you often late for class?”“Every time, when I get to the street corner, I always see a guidepost. It says, 'SCHOOL-GO SLOW!'”31. Peter is in school for years.A. one and a halfB. twoC. more than twoD. three32. Peter is often late for school because .A. he likes watching TVB. he goes to bed lateC. he can't sleep well at nightD. he can't get up on time in the morning33. Mrs Black is a .A. workerB. teacherC. guardD. policeman34. The first class begins at .A. ten to eightB. eightC. five past eightD. fifteen past eight35. The guidepost is for .A. driversB. PeterC. studentsD. teachers四、根据句意及汉语提示写单词完成句子。
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______．。
初一 英语寒假作业(含答案)(2)
初一年级英语学科寒假作业（2）一、单项选择。
( )1. -- Can you play ______ table tennis, Simon?-- Yes, I often play it after class.A. aB. anC. theD. /( )2. -- _______ your classmates all nice to you? – Yes, ________.A.Do, they doB. Are, they’reC.Are, they areD. Is, he is ( )3. _________ of the students in Class 2 looks happy.A. AllB. EachC. BothD. Every( )4. Is there______ in today’s newspaper?A. anything elseB. something elseC. else somethingD. else anything( )5. She wants ______ the room. Would you like_______ her?A. clean, helpB. to clean, helpC. clean, to helpD. to clean, to help( )6. Jim, with his family, ______ a bus to go home every day.A. takesB. takeC. is takingD. are taking ( )7. My teacher has many books. Because he ______ reading very much.A. wantsB. would likeC. lovesD. wants to ( )8. -- __________the woman like listening to music?—_________.A. Does; No, she doesB. Do; No, she doC. Does; Yes, she doesD. Do; Yes, she don't( )9. The boy often ________ a kite on Sundays in spring.A. flyB. flyingC. fliesD. flew( )10. Amy’s mother always makes her ________ English every morning.A. readB. readsC. readingD. to read( )11. This piece of music__________beautiful.A. looksB. soundsC. tastesD. smells( )12. ---_______ do you visit your grandparents? ---Once a month.A. How soonB. How longC. How muchD. How often ( )13. ---How are you, Andy? ---____________.A. How are youB. I’m fine, thank you.C. Glad to meet you, Andy.D. I’m a student from Beijing. ( )14. ---What about ___________a rest? – OK. Let’s go out and have a walk.A. to takeB. takesC. takeD. taking( )15. –Can you help me close the door?--__________. It's too cold.A. Certainly notB. Not at allC. You're welcomeD. Of course二、完形填空。
七年级英语寒假作业2
Exercise 4一单项选择：(15分)( ) 21. --- Sandy, _______ apple on the table is for you. Have it before you go out.--- Thanks, Mum. _______ apple a day keeps the doctor away.A. an; AnB. the; AnC. an; TheD. the; The( ) 22. There isn’t ______ jui ce in the bottle. Would you like ______ tea?A. some; anyB. any; someC. some; someD. any; any( ) 23. ---Is this shirt ______, Tommy? ---No, it’s Jim’s. Please give it to ______.A. yours; herB. yours; hersC. your; hisD. yours; him( ) 24. –What’s the time?–It’s half past six. It’s time for breakfast. Let’s_______.A. wake him upB. to wake him upC. to wake up himD. waking up him( ) 25. The shop near my home at 8a.m. and it for 10 hours a day.A. opens; is openB. is open; opensC. is opening; opensD. opens; is opening( ) 26. It is important ___________ everyone ____________ exercise every day.A. of; to doB. to; doingC. for; doesD. for; to do( ) 27. ---__________ Amy late for school? ---Never.A. How long isB. How often doesC. How many times doesD. How often is( ) 28. There ______ a book ________any pencils on the teacher’s desk.A. isn’t ；andB. aren’t ; andC. isn’t ; orD. aren’t ；or( ) 29. Eating too much is ______ for your ________ .A. good; healthB. bad; healthyC. good; healthyD. bad; health( ) 30. His father makes him ____________ every day.A. to practise runningB. practise runningC. practise runD. to practise run( ) 31.We have _______ exercise to do every day so we can’t play ______ computer games.A. too many; too manyB. too much; too manyC. too many; too muchD. too much; too much( ) 32. Boys and girls often play tricks________ each other________ April Fool’s Day．A．on；on B．to；on C．on；in D．in；on( ) 33. ---- Would you like some bread ? ---- _______________. I’d like some c akes .A. Yes , please .B. Yes , I’d like to .C. Yes , thank you .D. No, thanks .( ) 34. She is planning _________ shopping. _________ happy the girl is!A. to go, WhatB. going, WhatC. to go, HowD. going, How( ) 35. He has three uncles, They are __________.A. all man doctorB. all men doctorsC. both man doctorsD. both men doctors三、完形填空：(15分)The 12—year—old Stephen lives with his mother in Beijing now. He is from America. They move to China because his mother gets a great job in Beijing.Stephen is_36___. Everything here is new to him. The city, the school and the people are __37_ those in America. Stephen and his mother now__38 __ in a rented flat(出租房).The building is not tall,_39___ there is no lift. The building is not __40___ from Stephen’s new school. He walks to school. It just __41__ 10 mintutes. Around the __42__, there is a big supermarket.Stephen __43__ his new school----Yucai Middle School. It is big. Some students are Chinese. Some come from__44__ countries. But they all __45___ English. There is a very big__46__ in the school and there are a lot of English books there.Stephen is not __47__ at using chopsticks. Unluckily(不幸的是), __48__ the foods in the school canteen (餐厅)are Chinese food. So he has to__49__ to use chopsticks because he has lunch at school.Stephen loves Chinese Kongfu very much. He __50___ to learn Kongfu one day.( ) 36. A. worried B. unhappy C. excited D. surprised( ) 37. A. same as B. the same as C. different as D. different from( ) 38. A. lives B. live C. living D. to live( ) 39. A. and B. but C. or D. because( ) 40 A. far B. near C. away D. above( ) 41. A. costs B. takes C. spends D. has( ) 42. A. flat B. building C. floor D. house( ) 43. A. likes B. like C. worries D. dislikes( ) 44. A. else B. other C. all D. any( ) 45.A. say B. talk C. speak D. tell( ) 46.A. restaurant B. supermarket C. library D. sitting room( ) 47.A. well B. good C. bad D. better( ) 48. A. only a little B. some of C. all D. many of( ) 49. A. teach B. learn C. take D. like( ) 50. A. begins B. loves C. hopes D. thinks四、阅读理解：(30分) Atoast : 吐司sausage: 香肠pancake ：煎饼bacon: 熏肉( ) 51. When can you have breakfast in the bar?A. At 6:30 a.m.B. At 8:00 a.m.C. At 11:00 a.m.D. At 7:00 p.m.( ) 52. How much is the tomato juice?A. 0.25B. 0.65C. 0.75D. 1.50( ) 53. Which costs 2.00 among the following?A. Boiled or fried eggs with bacon.B. Small order of pancakes.C. Milk.D. Large order of pancakes.( ) 54. Tommy always has his breakfast here. He has apple juice, a fried egg with bacon and coffee. How much is this breakfast?A. 4.05B. 3.95C. 4.20( )55. What is the price of the hot chocolate?A. 0.20B. 0.30BNow there is a wonderful kind of road in Japan. When you drive on the road, you can hear nice songs.There are three such(这样) roads in Japan. One of them is near Numata city and it’s about 175 meters long. When you drive on it, you can hear the song----Memories of Summer. It can last for (持续)12.7second 〔秒〕.The drivers all like this road very much. They say the song keeps them awake(清醒的)when they are driving. Some people drive their cars to the road only because they want to listen to the nice song. The designer (设计者)of this road says, “ You can hear the beautiful song best when your speed(速度) is 50 kilometers per hour.〞( ) 56. The road in the passage(短文)is wonderful because_____________A. it can singB. it’s wideC. it can speakD. it can talk( ) 57. How many such roads are there in Japan now?.A. Only one.B. ThreeC. Four.D. Five.( ) 58. The musical(音乐的)road near Numata city is _____meter long.B.50 C( )59 Which of the following is TRUE?A. The song can last for several(几个) minutesB. The drivers like the road very much.C. The drivers don’t like the road because it makes them tiredD. You can hear the song best when your speed is 175 kilometers per hour.( ) 60. What is the passage about?A. Japanese songsB. A high-speed roadC. Numata cityD. The musical road in JapanCRaisins(葡萄干) in ice cream, in chocolate, and incook ies…Your favourite snacks cannot be without raisins!But do you know how people get raisins from full and juicygrapes? Dry(晒干) them in the sun? Well, that may be one way.But people from Xinjiang have another way.People there build many “blockhouses(碉堡)〞out of earth(地面) near a grape garden. It is in these blockhouses that the best raisins are made.People build many “blockhouses〞on the hillside. The blockhouses are usually three metres tall and are as big as the size of a classroom.They are quite different from the houses we live in. They have lots of holes in the wall. Inside there are many wooden shelves.After picking the grapes, people put them on the shelves. Because of the hot weather, hot dry wind gets through the holes in the wall and dries the grapes up. 30 to 45 days later, the fruit will turn into soft, sweet raisins!In around the year 535, people in Xinjiang started to send raisins as presents to the emperor(皇帝). This means that 1,500 years ago people began to know how to make raisins!( ) 61. This passage is mainly about _____________.A. how to grow grapesB. how to make raisinsC. how to build blockhousesD. how to pick grapes( ) 62. Where do people build “blockhouses〞in Xinjiang?A. In the classroom.B. In the grape garden.C. On the hillside.D. On wooden shelves.( ) 63. What does the underlined word hole mean in Chinese according to the passage?A. 树桩B. 枝条C. 架子D. 洞孔( ) 64. Why are the “blockhouses〞different from the houses we live in?A. Because they have lots of holes in the wall.B. Because they aren’t as big as the houses we live in.C. Because there aren’t any windows in them.D. Because there’re lots of grapes growing in them.( )65. Which of the followings is Not true?A. People can find raisins in some ice cream, chocolate and cookies.B. People only dry the full and juicy grapes in the sun to get the raisins.C. The grapes need 30-45 days to turn into raisins in the blockhouses.D. People in Xinjiang began to know how to make raisins 1,500 years ago.第二局部非选择题〔总分值70分〕五、词汇运用(10分)A) 根据括号中所给的汉语写出单词，使句子意思完整正确。
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°。
2021-2022学年八年级物理人教版寒假作业(2)
（2）——2021-2022学年八年级物理人教版寒假作业一、单选题1.2020年11月24日，中国再次发生了一件轰动全球的大事，嫦娥五号探测器在中国文昌航天发射场发射成功，这是我国探月工程“绕、落、回”三步走中，第三步的首次任务。
在探测器升空的过程中，以下列哪个物体为参照物，探测器是静止的( )A.太阳B.地球C.运载火箭D.发射架2.下列是牛牛同学的四个活动现象，其中属于机械运动的是( )A.思考物理问题B.听英语听力C.认真听讲D.跑步锻炼3.用刻度尺测量物体长度，下列情况会引起测量误差的是( )A.刻度尺的刻度不完全均匀B.刻度尺的刻度没紧贴被测物体C.读数时视线与刻度尺不垂直D.未能估读到分度值的下一位4.甲、乙、丙三只小兔分别以4 m/s 、180 m/min 、18 km/h 的速度从同一起跑线同时出发进行百米赛跑，它们以恒定不变的速度跑完全程，则下列说法正确的是( )A.甲先到达终点B.乙先到达终点C.丙先到达终点D.它们同时到达终点5.某小车从甲地到乙地，前半段路程的速度为1v ，后半段路程的速度为2v 。
那么该小车在整段路程内的平均速度是( ) A.122v v + B.12122v v v v + C.12122v v v v + D.1212v v v v + 6.如图所示，图甲是小车甲运动的s t -图像，图乙是小车乙运动的v t -图像，由图像可知( )A.甲车速度大于乙车速度B.甲车速度小于乙车速度C.甲、乙两车都以10 m/s 匀速运动D.甲、乙两车经过5 s 通过的路程都是10 m二、填空题7.我国古书《套买曜》上记载有：“人在舟中闭牖（门窗）而坐，舟行而人不觉。
”这是_____的生动描述，其中“舟行”是以 为参照物，“人不觉”是以 为参照物。
8.如图所示是小明某次步行后手机“微信运动”功能记录的数据.如果小明此次步行的时间是50 min ，一步的长度是0.5 m ，则他总共走了______m ，他步行的速度是______m/s.9.蜻蜓点水是指雌蜻蜓将卵直接产入水中。
语文小学三年级下册语文寒假作业(二)
小学三年级下册语文寒假作业（二）小学三年级下册语文寒假作业(二)为大家整理了三年级下册语文寒假作业，希望对大家有所帮助。
一 tng zhng ni gi pi zōng chǐ lin二圆溜溜、红彤彤、笑眯眯、冷冰冰、胖乎乎、亮晶晶、黄澄澄、白花花、金灿灿P4 三拿出作业本开始写作业会长痱子五葡萄形状：圆形或椭圆颜色：色泽随品种而异，有青绿色、紫黑色、紫红色、白、黑等吃法：可洗净后剥皮吃，也可制成葡萄汁、葡萄干和葡萄酒等喝味道：甘甜、酸、涩P5 六 1.寒冷挨冻崭新 2.位封块件句片3.尽快把自己身上的一件旧棉袄寄去说了一大堆好听的话，后来送了一件崭新的狐皮袄4.(1)宝贵的意思：价值高，意义大宝贵的棉袄指旧棉袄。
(2)因为那件旧棉袄帮助他渡过了最艰难的日子，生活因此得以继续，才会变好。
P6 5.雪中送炭，在别人最需要帮助的时候给予帮助，才是最有意义的。
第二个朋友，别太自私。
P7 一寸金难买寸光阴。
下笔如有神。
二 1.立名足 (2.词语接龙略)3.森众磊晶焱淼畾鑫垚掱皛三夺： D 大②④①哄：H 口①③②P8 四严格精彩沉重五进步落后节约浪费朦胧清晰六人山人海-海底捞月-月下老人-人定胜天-天涯海角七说起吃西瓜，数爸爸吃得最快了。
只见他双手捧着一块大西瓜，嘴巴从左边扫到右边，哈!一眨眼的功夫，他的手上只剩下青青的西瓜皮了。
再看看他的嘴，塞得圆鼓鼓的，可爱极了!不一会儿，一粒粒西瓜籽就被他吐了出来。
相比之下妈妈吃西瓜可就斯文多了。
她咬一口，一骨碌，调皮的西瓜籽就从她的嘴里溜了出来。
我嘛!特喜欢吃西瓜，可也特讨厌镶在西瓜肉里的瓜籽了。
这就得麻烦妈妈了，她用小刀耐心的把一粒粒瓜籽挑出来，我就毫无顾忌，大口大口的吃了。
啊!满嘴甜甜的瓜汁，从嘴里甜到心里，真是人间美味啊!吃罢西瓜，大家再看看我，小肚子也鼓起来了，嘴巴上，手臂上，还有胸前的衣服上都被西瓜汁染红了。
以上就是三年级下册语文寒假作业，谢谢查阅。
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．。
寒假作业（2）Welcome Unit -2021-2022学年高一英语人教版（2019）必修第一册
（2）Welcome Unit ——2021-2022学年高一英语人教版（2019）寒假作业一、阅读理解1.Chinese students always complain that they're under great pressure and don't get enough sleep. But they may be surprised to learn that they're much luckier than their peers (同龄人) in South Korea and Japan, according to a recently published report, conducted by Shanghai Academy of Social Sciences on the physical and mental health of senior high school students in the three Asian countries.According to the study, among nearly 6,000 high school students in the three countries, Chinese students are the tallest but poorest in physical fitness. Chinese students are on average 168.17cm, compared with 167.61cm for South Korean students and 164.70cm for Japanese students. Chinese students have asked for sick leave more than students in other countries. About 72 percent of South Korean students have never asked for sick and injury leave during high school, compared to 53 percent for Japanese students and 45 percent for Chinese students. Moreover, Chinese students drink alcohol and smoke earlier than South Korean and Japanese students. Around 70 percent of Chinese students have drunk alcohol, compared to 50 percent for South Korean and Japanese students.According to the survey, Japanese and South Korean students suffer more pressure than their Chinese peers. Statistics show 16 percent of students in China said they experienced mental pressure often over the past year, while the numbers in Japan and South Korea are 33 percent and 47 percent respectively (分别). Their worries come from "study", "future after graduation", "friendships" and "relationships with their parents". To go with stress, 57.9 percent of South Korean students sleep the least, less than six hours a day, compared with 46.6 percent of Japanese students and 30 percent of Chinese students.More Chinese students were satisfied with their physical appearance, double that of students in the survey from Japan and South Korea. The report said that over ha lf of students in South Korea had tried to lose weight in the past year, while in China the figure was only 22 percent. In measures of self-worth, such as "I think I am valuable", "I think I am successful", "I can complete many things" and "I won't give up to failure", Chinese students showed greater self-confidencethan students in Japan and South Korea.1.What's the main idea of the second paragraph?A.Chinese teenagers are the tallest, but most unhealthy.B.Chinese students drink the most alcohol and smoke earliest.C.Japanese students ask for the least sick leave.D.Chinese students ask for sick leave most often.2.It can be inferred from the passage that_________.A.Chinese stud ents are luckiest, yet most unsuccessfulB.Chinese students are confident in themselves and luckierC.Japanese students are most stressedD.South Korean students sleep the least3.The worries that c ause students to be stressed come from the following factors EXCEPT __________.A.study and careerB.physical appearanceC.friendshipsD.family relationships2.You may not know a lot of people when you start senior high school. Maybe your friends from junior high school are going to a different senior high school. Even if you know other freshmen(—年级学生), you still feel anxious that you don't know any upperclassmen. How are you going to make friends among this sea of unknown faces?Most senior high schools hold the freshman orientation(迎新会) before school actually starts. It is helpful because you not only learn your way around the building but also get to meet some of your teachers and fellow freshmen. That way, when you show up on your first day of school, you may already recognize a few familiar faces.When you talk to people at orientation, you'll probably find that a lot of them are feeling just like you are. They're all new to the school and don't know what to expect. Talking about a common concern with your classmates can help you develop friendships.The work in senior high school is something freshmen are probably worried about. It builds on what you learned in junior high school, giving you a more advanced(高深的) knowledge of many subjects. So you may find you have more work to do or that it's a bit more challenging. If you ever find your work too difficult, teachers can give you extra help.Senior high school also has more after-school activities than junior high school, such as clubs,music and theater groups a nd sports teams. This is a good time to explore your interests and try new things.Junior high school taught you the basics of time management and social skills while providing you with a little extra support and guidance. Senior high school gives you the chance to learn how to be more independent and responsible.1. How do the freshmen usually feel on their first day of senior high school?A. Proud.B. Nervous.C. Excited.D. Curious.2. What are freshmen probably worried about?A. The learning task.B. The ability to make friends.C. The freshman orientation.D. The relationship with teachers.3. What do after-school activities mainly help students to do?A. Develop friendships.B. Develop their interests.C. Build up their strength.D. Improve their learning ability.4. What is the last paragraph mainly about?A. What you'll learn in senior high school.B. What you learned in junior high school.C. The difference between junior high school and senior high school.D. The importance of being more independent and responsible.3.It's school time again! You're probably feeling excited and maybe a little sad that summer is over. Some kids feel nervous or a little frightened on the first day of school because of all the new things: new teachers, new friends, and even a new school. Luckily, these "new" worries only stick around for a little while. Let's find out more about going to a new school.Most teachers kick off the new school year by introducing themselves and talking about all the stuff you'll be doing that year. Some teachers give students a chance to tell something about themselves to the rest of the class, too. When teachers do the talking on the first day, they often read classroom rules and school rules to you so you'll know what's allowed and what's not. Please pay close attention.You might already know a lot of people in your class on the first day, but it's a great day to make a new friend, so try to say hello to kids you know and new ones that you don't know. Make the first move and you'll be glad you did, and so will your new friends!Seeing friends you haven't seen for some time can make the first day a good one. You can make the day feel special by wearing clothes that you really like. Maybe you got a great T-shirt on one of your vacations, or a pair of sneakers. It also can make you feel good to be prepared and have all the things you need, such as pencils, folders, and whatever else you'll need. But make sure that you pack them the night before in case you don't have time in the morning.1.What does the underlined phrase "kick off" in the second paragraph probably mean?A.Start.B.Study.C.Find.D.Teach.2.What does the last paragraph mainly tell us about?A.What to know about a new school.B.How to prepare for a new school.C.What to do on your first day of school.D.How to spend your first day of school.3.According to the passage, you usually do the following things on the first day of school except _________.A.introduce yourselfB.learn about the school rulesC.make new friendsD.go over your new lessons4.If you happen to see an old friend on the first day of school, what will you feel from the passage we know?A.Nervous.B.Sad.C.Happy.D.Worried.4.To most of us, school means classes, teachers, schedules, grades and tests. But for the children at Sudbury Valley School, Massachusetts, school is very different.Firstly, there are no lessons. All the children, aged between 4 and 19, do whatever they want to. There are no teachers —only "staff members". The idea behind this is that you do not need to make children learn, because children want to learn anyway. "You do not need to say to a three-year-old, 'Go to explore your environment.' You can't stop them!" says Daniel Greenberg, a founder of the school. "But if you make children do what you want all day, they will lose all taste for learning."At Sudbury Valley School, you will permit children to talk, read, paint, cook, work on computers, study French, play the piano, climb trees, or just run around. Two boys spent three years just fishing!The other way that Sudbury Valley School is different is that the children can decide the rules. Every week, there is a school meeting where both children and staff have one vote each—even thefour-year-olds. They decide the school rules, how to spend the school budget, and even which staff they want and do not want any more.When the school first opened i n 1968, people said it would never work. But today, the school has 200 students, and 80% of its students go on to college. Even the two boys who went fishing all the time have successful careers today. One of them is a musician and the other is a computer scientist.1.What is the main topi c of the article?A.An unusual school.B.Children's hobbies.C.A school without rules.cation in the US.2.What does the school believe?A.Teachers cannot teach children well.B.Children learn best when they do what they want to do.C.Learning is for adults—children should only play.D.Children should only learn about one thing at a time.3.What does Daniel Greenberg say about three-year-olds?A.They love learning.B.They are very naughty.C.They want to be outside all the time.D.They are too young to learn anything.4.Who has the most power in the school meetings?A.The older children have more power than the younger children.B.A child has more power than an adult.C.The younger children have more power than the older children.D.Everybody has equal power.二、七选五5.Just Go to UniversityFor any student, going to university is one of the most important stages of their lives. It is a time when a young person will move out of their home to be independent. ①_______ Are youready for such an exploration? The following information may be helpful.· Why should you go to university?Learning is a lifelong process. University is the right place where you can learn both academically and socially. At university, you will be taught by leading lecturers in their fields of study. ②_______Meanwhile, you will meet people with different backgrounds at university. This offers you the chance to learn to look after yourself, to develop your own values and to accept those who may be different.·③_______Once you have decided that you do want to go to university, how can you choose a dream one?④_______ Your interest, the major and the course to be taken are all the concerns. Many universities have open days or send tutors out to talk to the students on what they offer. This also gives you a chance to ask questions. Finding out what their predicted exam grades will also help students determine which university may be the most suitable.· What can you learn at university?In many universities, each student begins with a general knowledge base in the first year. Students can have more time to explore their interests before committing to a specific subject. Apart from the academic achievements, various societies, where freshmen can meet like-minded friends, offer you chances to develop the extra-curricular interests in many fields. ⑤_______A. How can you choose a university?B. You have to first think of various aspects.C. What should you prepare before going to university?D. You can thus equip yourself with enough academic knowledge.E. Besides, it is a great honor to be admitted into such a university.F. In one sense, the university can be a completely new world to explore.G. University provides the all-important stepping stone for your future life.三、完形填空6.My nephew's 10-year-old son came for a visit one hot July weekend. I persuaded him to1inside and joined him in a game. After playing for an hour, I suggested that we relax for a while. I 2 my favorite chair to let my neck relax. He left the room and I was catching a fewenjoyable 3 of peace."Look, Alice," he said excitedly as he 4 over to the chair where I was sitting. "I found a kite. Could we go outside and 5 it?" Looking out of a nearby window, I noticed it was still outside. "I'm sorry. Tripper," I said, sad to see his 6 expression. "The wind is not blowing today. The kite won't fly."The7 10-year-old boy replied, "I think it's windy enough. I can get it to fly," he answered8 he hurried out to the back door.He ran back and forth, as9 as his ten-year-old legs would carry him, looking back 10 at the kite behind. After about ten minutes of unsuccessful trying, he came back in.I asked, "How did it 11?" "Fine," he said, not wanting to admit (承认) the failure. "I got it to fly some." However, I heard him say secretly, "I guess I'll have to wait for the 12 ."At that moment I heard another voice speak to my 13 ," Alice, sometimes you are jus t like that. You want to do it your way 14 waiting for the wind."And the voice was right. We usually want to use our own efforts to 15 what we want to do. We must learn how to make use of "the wind" in the first place!1.A.live B.lie C.study D.stay2.A.fell into B.jumped off C.cleaned up D.went through3.A.times B.hours C.moments D.periods4.A.sent B.climbed C.left D.ran5.A.decorate B.fly C.hang D.drop6.A.bright B.satisfied C.dull D.unhappy7.A.determined B.talented C.clever D.generous8.A.as B.unless C.after D.until9.A.hard B.hardly C.actively D.gradually10.A.angrily B.hopefully C.doubtfully D.nervously11.A.make e C.go D.settle12.A.news B.order C.wind D.sunshine13.A.dream B.memory C.heart D.world14.A.because of B.instead of C.except for D.as for15.A.imagine plete C.fancy D.decide四、语法填空7.阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
2021人教版二年级各学科寒假作业答案模板
2021人教版二年级各学科寒假作业答案模板寒假作业意义在于让我们在疯狂的同时还记得学习，但更多的时候我们需要劳逸结合，这样才是最好的选择，那么你们知道关于人教版二年级各学科寒假作业答案内容还有哪些呢?下面是小编为大家准备2021人教版二年级各学科寒假作业答案模板，欢迎参阅。
二年级各学科寒假作业答案：语文一、集合专心致至规则掌声阿姨叔叔二(一)五六八三二天地南北东西天海川不目口(二)① 红艳艳② 欢快地③ 湿漉漉④ 悠闲地(三)、1、( 常常 )2、( 美丽 )3、( 有时 )4、( 马上 )(四)①动物：蚂蚁青蛙小猫小狗乌龟②植物：杨树荷花南瓜龙眼山里红③用具：纸扇铁锅大秤雨伞菜刀(五)省略三、1、妈妈的爱是清凉的风，是遮雨的伞，是滴落的泪，是责备的目光，是亲切的教诲。
我想对妈妈说“省略。
”2、周恩来立志“为中华崛起而读书”，女娲发誓要“修补好残破的天空”，我的志向是“ 略”。
小英雄：王二小、落水后的小姑娘、江凡，于连，爱动脑筋的曹冲、瓦特，还有讲信用的李丹、皮萨斯。
四、①树头花落未成阴日出江花红胜火江水绿如蓝春风似剪刀万条西塞山前桃花流水小荷才露尖尖角②、北京29 跳水跳高射箭 100米举重等贝贝、晶晶、欢欢、迎迎、妮妮③鼠牛虎兔龙蛇马羊猴鸡狗猪五、1、 3 52、波圆元漂彩朗郎3、③(√)4、桃树农田茶树美丽5、略二年级各学科寒假作业答案：英语2页 I 抄写字母，注意占格II 1.k 2.j 3.l 4.f 5.d 6.bIII 电视—TV 中华人民共和国—PRC中央电视台—CCTV 美利坚合众国—USA3页 I 1—I like your kite. 2—Yes,I do. 3—Thank you!II 1.一件黑色的衬衫 2.三件红色的T恤衫 3.6只黑色的鞋5页 I 1.第2个句子√ 2.第1个句子√ 3. 第1个句子√ 4.第1个句子√5.第2个句子√6.第1个句子√II 1.D 2.C 3.A 4.B 5.BIII 1.dolls 2.cars 3.pandas 4.jigsawsIV 1.B 2.C 3.C 4.A 5.B9页 I H-h G-g B-b J-j L-l F-fII +-_--Maths ABC—English 音乐符号—MusicIII apple bag cow book chicken boxIV 1—B 2—A 3—D 4—E 5—C11页 I A-a I-i M-m N-n E-e G-g F-f C-cII 1.√ 2.× 3.× 4.√12页 II mouth, nose, hand, fingerIII Aa, Ee, Ii, Oo, Uu13页 I 第一幅图T-shirt 第二幅图dad 第三幅图mum 第四幅图dressII 1.A 2.B 3.C 4.A 5.AIII 1.Art 2.Science 3.Maths 4.English 5.Chinese 6.PEIV 根据自己实际情况回答，注意单词拼写，句子开头首字母大写及标点16页I 1.have 2.play 3.frog 4.art 5.we 6.music 7.please 8.mathsII 1.4 o’clock 2.8 o’clock 3.11 o’clock 4.10 o’clock5.1 o’clock6.6 o’clock7.2 o’clock8.3 o’clockIII 1.6 o’clock 2.What’s the time? It’s 10 o’clock.IV 1.Hello 2.are, fine 3.morning 5.andV 1.What’s, It’s, It’s time 2.the time, It’s time19页 I 1.a 2.d 3.e 4.fII 1—B 2—A 3—D 4—E 5—CIII 1. A√ 2. B√ 3. A√22页 I 1.g 2.h 3.g 4.i 5.h 6.hIV 1.No,it isn’t. 2.Yes,it is. 3. No,it isn’t. 4. Yes,it is.25页 I 1.起床 2.回家 3.上学 4.吃午饭 5.上床睡觉6.7:307.9:008.3:009.6:30 10.5:00II 1—D 2—C 3—B 4—A 5—E28页 I 1.prince，pig 2.queen 3.rain，rabbitII 1.B 2.A 3.BIII 1.B 2.B 3.AIV 1.B 2.B 3.B 4.B31页 I We have nine boys in the classroom.II 1—E 2—D 3—B 4—A 5—CIII 结合自己实际写，注意第三人称变化IV 1.A 2.B 3.A34页 I 1.第一幅图√ 2. 第一幅图√ 3. 第二幅图√II 1.A 2.B 3.B 4.A37页 I 1.way，window 2.vase 3.X-rayII 2.summer，hot 3.autumn，cool 4.winter，cold40页 I 1.yellow，you 2.zebra，zebra，zooII 1.C 2.B 3.B 4.AIII 1—B 2—A 3—D 4—CIV boy，8(eight)，school，English，Chinese，Art，football，go43页 I 1.play football 2.park 3.play the fluteII 1.B 2.A 3.BIII 1.C 2.A 3.D 4.BIV 1.Maths，English，Science 2.PE，Art，Chinese3. PE，Art，Chinese4. Maths，English，Science二年级各学科寒假作业答案：数学一、直接写出得数。
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寒假作业2——填空姓名1、 3吨50千克=（）吨 3小时15分=（）分8000平方米=（）公顷 5.06平方米=（）平方米（）平方分米6.4公顷=( )平方米 1.2时=( )时( )分。
3吨60千克＝（）吨 4.2小时＝（）小时（）分（）平方米＝25平方分米＝（）平方厘米2、 2.94×3.5的积是（）位小数。
如果把乘数的小数点去掉，要使积不变，被乘数应（）。
3、两个数相除，商是5，如果被除数和除数同时扩大100倍，商是（）。
4、身份证号码规定，倒数第二位的数字表示性别，单数表示（），双数表示（）。
5、12÷11的商用循环小数表示是（），精确到百分位约是（）。
6、5.6乘两位小数的积是( )位小数。
7、把1.30∙7、1.307、1.3∙∙7、1.∙30∙7按从小到大的顺序排列是（）。
8、两个完全一样的三角形可以拼成一个（）。
如果每个三角形的面积是2.4平方厘米，拼成的图形的面积是（）平方厘米。
9、一块平行四边形地，底长200米，高150米，占地（）公顷。
10、一个梯形，上底与下底的和是60厘米，高15厘米，它的面积是（）。
11、三个连续自然数，中间的一个是n，其余两个分别是（）和（）。
12、循环小数8.59696……是( )小数,保留两位小数是( )。
13、一个直角三角形的三条边分别是3厘米、4厘米、5厘米，这个三角形的面积是（）平方厘米；斜边上的高是（）厘米。
14、 X与7.2的和是( )。
比X的6倍多1.5的数是( )。
15、六年级1—6班植树棵数分别是50棵、42棵、47棵、45棵、44棵、51棵，这组数的平均数是（），中位数是（）。
16、把3个边长是1厘米的正方形，拼成一个长方形，这个长方形的周长是（）厘米，面积是（）平方厘米。
17、在（）里填上“>”、“<”或“=”号1.96÷1.01○1.962.85×2.6○2.85 1.25÷0.36○1.257.6+0.2○7.6 0.58×1○0.58 2.83×0.9○2.831.3×0.9（）1.31÷3（）0.32.4÷0.8（）2.43.5×0.1（）3.5÷0.118、在（）里填上适当的数。
0.9×（）>0.90.6÷（）<0.619、58.6÷11的商是（），这个商的第20位上的数字是（）。
20、被除数、除数、商三个数的积是36，被除数是（），如果除数是6，那么商是（）。
21、在1.5353……、1.5333……、1.533533……中最大的数是（）。
22、一只青蛙一张嘴、两只眼睛四条腿，N青蛙（）张嘴，（）只眼睛，（）条腿。
23、小华今年11岁，妈妈比小华大b岁，5年后，妈妈比小华大（）岁。
24、一块三角形土地，底是400米，高是250米，这块土地的面积是（）公顷。
25、一个长方形的长是30米，宽16米，与它两种相等的平行四边形的底是20米，高是（）米。
26、按规律填数：1、4、9、16、25、（）、49、6427、8.25÷0.05=( ) ÷5 3.08÷1.2=( ) ÷12 25.6÷0.008=( ) ÷828、0.045去掉小数点后,这个数就扩大( )倍29、7..1.8保留两位小数是( ),保留三位小数是( )30、18×2.5×4=18×(2.5×4)这是根据( )定律进行简便计算31、两个数相除,商是2.6,若被除数和除数同时扩大50倍,商是( );若被除数扩大到原来的10倍,除数不变,商是( )32、( ) ×3.2=8.32 ( )÷2.8=5.633、做一只水桶用铁皮0.5平方米,现有铁皮8.9平方米,最多可做( )只水桶34、23.6÷14 商的最高位在( )位上,商比1( )(括号里填大或小)35、把0.7、0...87、0.78、0..87这四个数中,最大的数是( ),最小的数是( )36、23.5858……还可以简写成( ),它的循环节是( )37、已知1.6×0.32＝0.512，那么0.16×0.32＝( ) ，160×3.2＝( )( )×0.32＝51.2，0.016×( )＝0.512，1.6×( )＝51238、5.432的小数点向右移动两位，这个数就扩大了( )倍，增加了( )倍。
39、m×7×n用简便写法写成( )，5×a×a可写成( )。
40、三个连续的自然数，最小数表示a，最大的自然数是（）；如果三个数中，中间的一个数是b，另外两个自然数是（）和（）。
41、要想5x－9的值等于9，x应是( )，a和b的和的一半表示为（）。
42、学校买来篮球10个，足球12个，每个篮球a元，每个足球b元。
篮球和足球共付（）元；当a是21元时，买10个篮球用去（）元。
43、王叔叔每小时加工a个零件，t小时共加工b个零件，那么b＝，a＝44、一本练习本m元，20元可以买（）本，买75本共需（）元。
45、在○内填上＞、＜或＝。
78.64÷0.99○78.64×0.99 23.1×4.03○2.31×40.3960÷1.05 ○960×1.05 8.4＋0.4○8.4×0.446、两枚五角硬币，向上抛后落到桌面上，朝上的面相同的可能性是( )，朝上的面不同的可能性是( )47、3吨50千克=（）吨3小时15分=（）分8000平方米=（）公顷 5.06平方米=（）平方米（）平方分米48、2.94×3.5的积是（）位小数。
如果把乘数的小数点去掉，要使积不变，被乘数应（）。
49、两个数相除，商是5，如果被除数和除数同时扩大100倍，商是（）。
50、身份证号码规定，倒数第二位的数字表示性别，单数表示（），双数表示（）。
51、12÷11的商用循环小数表示是（），精确到百分位约是（）。
52、（a÷b）×c=（）·（）＋（）·（），这是应用了（）。
53、把1.30∙7、1.307、1.3∙∙7、1.∙30∙7按从小到大的顺序排列是（）。
54、两个完全一样的三角形可以拼成一个（）。
如果每个三角形的面积是2.4平方厘米，拼成的图形的面积是（）平方厘米。
55、一块平行四边形地，底长200米，高150米，占地（）公顷。
56、一个梯形，上底与下底的和是60厘米，高15厘米，它的面积是（）。
57、三个连续自然数，中间的一个是n，其余两个分别是（）和（）。
58、六年级1—6班植树棵数分别是50棵、42棵、47棵、45棵、44棵、51棵，这组数的平均数是（），中位数是（）。
59、把3个边长是1厘米的正方形，拼成一个长方形，这个长方形的周长是（）厘米，面积是（）平方厘米。
60、4.2平方米=（）公顷 2.04吨=（）吨（）千克61、4.2020……是（）循环小数，用简便方法写作（）。
62、根据52.5÷25=2.1，写出52.5÷2.5=（）63、一个三角形的面积是12平方分米，与它等底等高的平行四边形的面积是（）。
64、一段路长a米，小红每分钟走X米，走了3分钟，还剩（）米。
65、如果1÷a=0.0909……、2÷a=0.1818……、3÷a=0.2727……，那么8÷a=（）66、有4张字母卡片，上面分别写着A、B、C、D。
每次从中抽出两张，同时抽出卡片A和B的可能性是（）。
67、赵经理的身份证号码编号是422100************，赵经理的性别是（），出生时间是（）。
68、把一些1立方厘米的小正方体摆放在一起，从三个方向分别看到下面的图形，这些小正方体最多（）块，最少（）块。
从正面看从左面看从上面看69、0.369×2.4的积有（）位小数。
70、0.847保留一位小数是（），保留两位小数是（）。
71、5.32727…用循环小数的简单记法表示是（）。
72、在括号中填入“>”、“<”或“=”。
2.65×0.99（）2.65 5.08×1.01（）5.084.75÷1.01（）4.75 9.24÷0.97（）9.2473、一段路长a米，小明每分钟走x米，走了5分钟，还剩（）米。
74、口袋里有1个红球，2个绿球，3个黄球。
任意摸出一个球，红球的可能性是（），绿球的可能性是（），黄球的可能性是（），白球的可能性是（）。
75、13dm2=（）m2 1.5时=（）分76、5.6÷11的商用循环小数表示是（），它的循环节是（），得数精确到百分位是（）。
77、在“( )”里填上“<”“>”或“=”。
3.75÷0.24( )3.75 3.5÷0.25( )3.5×478、用字母表示乘法分配律（）。
用字母表示长方形周长计算公式（）。
79、2.8、2.808、、中，最大的数是（），最小的数是（）。
80、如果mx+6=14，当x=2.5时，m2-1=( )。
81、有苹果b千克，装了4筐后还余ɑ千克，平均每筐苹果（）千克。
82、一个三角形的面积是7.8 m2，高是2.6m，底是（）。
83、一副扑克牌（54张）中任意抽出一张，抽出一张“红桃”牌的可能性是（），抽出一张“3”的可能性是（）。
84一名射击运动员一次练习的成绩是9.8环、10环、9.5环、9.9环、8.9环、9.2环。
他的平均成绩是（）环，中位数是（）环。
85、方程1.2x+3x=84的解是（）。
86、苹果每千克a元，梨每千克b元，买了3千克苹果，2千克梨共付（）元。
87、用字母表示乘法结合律（）。
88、0.01212……用简便记法表示是（），循环节是（），它是（）循环小数。
89、一个平行四边形面积是240㎡，它的高是16dm,底是（）m。
90、当m=3；n=5时，㎡+6n的值是（）。
91、从写有1、2、3的三张纸条中任取两张，和为双数的可能性是（）。
92、数列2、3、5、8、13、21、34、55的中位数是（）。
93、 6.15千米＝（）米 1时45分＝（）时94、34.864864 简便方法表示是（），保留三位小数约是（）95、水果店有苹果m千克，每天卖出6千克，x天后还剩（）千克。
96、4.6×0.02的积是（）位小数，如果把因数0.02扩大100倍，要使积不变，另一个因数的小数点应该（）。