

早教英语绘本Biscuit Sorybook Collection这里包含10本.pdf
上传时间:2024-01-28 页数:181
586人已阅读
(5星级)
586人已阅读
(5星级)
This is George.He was a good little monkey and always very curious.This morning, George and the man with the yellow hatwere at the train station.They were taking a trip to the country with their friend,Mrs. Needleman.But first they had to get tickets.Inside the station everyone was in a hurry.People rushed to buy newspapers to read and treats to eat.Then they rushed to catch their trains.But one little boy with a brand new toy engine was not in a hurry.Nor was the small crowd next to him.They were just standing in one spot looking up. George looked up, too.A trainmaster was moving numbers and letters on a big sign.Soon the trainmaster was called away.But his job did not look finished.George was curious. Could he help?Then, just like the trainmaster, he picked a letter off the sign and put it in a different place.George climbed up in a flash.Next he took the number 9 and put it near a 2.George moved more letters and more numbers. He was glad to be such a big help."Hey," yelled a man from below. "I can't tell when my train leaves!""What track is my train on," asked another man."What's that monkey doing up there," demanded a woman. She did not sound happy.The trainmaster did not sound happy either: "Come down from there right now," he hollered at George.Poor George.It's too easy for a monkey to get into trouble. But, lucky for George, it's also easy for a monkey to get out of trouble.Right then the conductor shouted, "All aboard!"A crowd of people rushed toward the train. George simply slid down a pole,scurried over a suitcase, and squeezed with the crowd through the gate.There he found the perfect hiding place for a monkey.The little boy with the toy engine also ran through the gate."Look, Daddy," he said, "a train!"His father looked up. "Come back, son," he yelled. "That's not our train!"But it was too late.The gate locked behind him.The boy began to cry.George peeked out of his hiding place.He saw the boy's toy roll toward the tracks.The boy ran
上传时间:2024-01-28 页数:25
586人已阅读
(5星级)
586人已阅读
(5星级)
深圳市 2021年初中毕业生学业水平考试英语第一部分选择题(50分)I. 完形填空 (10分)阅读下面短文, 从短文后所给的 A、B、C、D 四个选项中选出能填入相应空白处的最佳选项, 并在答题卡上将相应字母编号涂黑。(共 10 小题, 每小题1分)It started 30 years ago with a squirrel. A few months after I had moved into a downtown ____1____ my next-door neighbor, Nicole Figaro, knocked, asking for help with a squirrel that had gotten into her flat.I frightened the unexpected ____2____ away and made a new friend. Soon Nicole was inviting me over for dinner or ____3____ home-made food at my door. When I went to my beach house, Nicole helped ____4____ my mail and water my plants. And when she traveled as a flight attendant, I did the same for her. Wherever she went, shed ____5____ to bring me wonderful gifts, but her smile has been the greatest of all. In 1997, I had a lovely child and it was Nicole who took care of me and him. Years later, I returned the favour. I helped out when her husband was sick, ____6____ her and giving her support. More and more, we drew inspiration from each other. ____7____, the pandemic hit. My husband was out of work and my son couldnt be back to Britain because ofthe virus. I was ____8____ about them. Nicole helped my family to prepare for the pandemic and shared necessities with me. Without her, I couldnt go through ____9____ times. A _____10_____ might separate our flats and masks can separate the viruses, but nothing is able to separate our hearts.1. A. houseB. flatC. streetD. area2. A. customerB. hostC. guestD. enemy3. A. sellingB. makingC. postingD. leaving4. A. look forB. copy downC. pick upD. hold out5. A. forgetB. keepC. thinkD. remember6. A. helping outB. staying withC. smiling atD. depending on7. A. EspeciallyB. ActuallyC. GenerallyD. Unluckily8. A. worriedB. madC. nervousD. serious9. A. excitingB. simpleC. difficultD. good10. A. roomB. wallC. yardD. gardenII阅读理解 (40分)第一节 阅读下列短文, 从每小题所给的 A、B、C、D 四个选项中选山最佳选项, 并在答题卡上将相应字母编号涂黑。(共 15 小题, 每小题2分)AShashiyu was once a poor village in Hebei Province, but now it has changed into a rich and livable place.
上传时间:2023-05-09 页数:8
586人已阅读
(5星级)
江苏省徐州市2021年中考语文试卷注意事项1.本试卷共6页,满分140分,考试时间150分钟。2.答题前,请将姓名、文化考试证号用0.5毫米黑色字迹签字笔填写在本卷和答题卡的指定位置。3.答案全部涂、写在答题卡上,写在本卷上无效。考试结束后,将本卷和答题卡一并交回。一、积累与运用(22分)1.根据要求填写古诗文名句。(10分)(1)生当作人杰,。 (李清照《夏日绝句》)(2)乡书何处达?。 (王湾《次北固山下》)(3),,将军白发征夫泪。(范仲淹《渔家傲·秋思》)(4),,参差披拂。 (柳宗元《小石潭记》)(5)欧阳修的《醉翁亭记》中,两句后来被浓缩为成语,比喻说话做事本意不在此而在别的方面(6)你班拟出一期以莲文化为主题的黑板报,你准备选取,这两句连续的古诗文名句来歌颂君子洁身自好的传统美德。2.根据语境作答。(6分)湖水清冽,状似天镜,静如美玉。鸟类扇动着蝉翼般的翅膀,在云龙湖划下错杂交织的娟秀弧线。澄碧的水面上,鸟儿们在你追我赶。那景致,纵是最xián shú()的画笔也难以描绘,最美丽的镜头也难以定格。在云龙湖,我的身心从未如此( )。云龙湖的一树一水,一花一草,都如袅袅升腾而来的禅意,润泽着我,柔抚着我。我甚至能听到时间行走的步履声。在暖阳一深一浅的呼吸中,我屏气凝息,把云龙湖的一切都记存心间。我脚步轻轻,在湖畔,吸吮着来自身边气息的清新。像一位衣衫翩翩的歌者,举杯邀景,神色yōu xián( )。我不禁艳羡这里的每一株草,每一棵树,艳羡它们能终日与云龙湖相伴,守着岁月看日升日落,看月圆月缺,看每一只飘飞的蝴蝶( )。(1)根据拼音在文中括号内填写正确的词语。(2分)(2)为文中A、B处选择恰当的词语。(2分)宁静安静翩翩起舞展翅高飞(3)修改文中画线句的语病,把正确的句子写下来。(2分)3.下面四个句子是徐州黄楼五省通衢牌坊上的两副对联,排列顺序正确的一项是(3分)①地锁江淮人文一脉兴秦汉②九州胜景龙吟虎啸帝王都③衢通南北气势千秋贯古今④五省通衢禹尧封神圣地A.①④③②B.④②①③C.③①②④D.②①④③4.下列文学和文化常识表述正确的一项是()(3分)A.《西游记》是一部有趣的书,孙悟空和猪八戒都能识破一切妖魔鬼怪。《钢铁是怎样炼成的》是一部励志的书,主人公保尔为了理想跟各种磨难作不屈的斗争。B.托物言志是一种通过描写具体事物的形象来表达思想、寄托感悟的创作手法。朱自清的《春》、茅盾的《白杨礼赞》、宗璞的《紫藤萝瀑布》等都运用了这种手法。C.《战国策》是战国刘向整理编辑的国别体史书,《史记》是西汉司马迁撰写的纪传体史书,《资治通鉴》是北宋司马光主持编纂的编年体史书。D.许多传统谦敬语在现代社会生活中还常常使用。比如,打扰别人说劳驾,请别人指导说赐教,称自己的文章为拙作,欣赏别人的文章叫拜读。二、阅读(55分)(一)阅读文言文选段,完成5~8题。(12分)熙宁十年秋七月乙丑,河决于澶渊①,东流入钜野,北溢于济南,溢于泗。八月戊戌,水及彭城下,余兄子瞻适为彭城守。水未至,使民具畚锸,畜土石,积刍茭,完窒隙穴,以为水备。故水至而民不恐。自戊戌至九月戊申,水及城下者二丈八尺,塞东西北门,水皆自城际山。雨昼夜不止,子瞻衣制履屦,庐于城上,调急夫、发禁卒以从事,令民无得窃出避水。以身帅之与城存亡故水大至而民不溃。方水之淫也,汗漫千余里,漂庐舍,败冢墓,老弱蔽川而下,壮者狂走,无所得食,槁死于丘陵林木之上。子瞻使习水者浮舟楫载糗饵以济之,得脱者无数。水既涸,朝廷方塞澶渊,未暇及徐。子瞻曰:澶渊诚塞,徐则无害,塞不塞天也,不可使徐人重被②其患。乃请增筑徐城,相水之冲,以木堤捍之,水虽复至,不能以病徐也。故水既去,而民益亲。于是即城之东门为大楼焉,垩以黄土,曰:土实胜水。徐人相劝成之。辙方从事于宋,将登黄楼,览观山川,吊水之遗迹,乃作黄楼之赋。(选自苏辙《黄楼赋并叙》)注:①澶渊:古湖泊名。②被:遭受,蒙受5.用斜线/给下面句子断句。(限两处)(2分)以 身 帅 之 与 城 存 亡 故 水 大 至 而 民 不 溃。6.下列句中加点词的意义和用法相同的一项是()(3分)A.①余兄子瞻适为彭城守②陈胜吴广皆次当行,为屯长B.使民具畚锸 ②此人一一为具言所闻C.①方水之淫也②太
上传时间:2023-05-08 页数:21
586人已阅读
(5星级)
3.1 认识三角形1,一个木工师傅现有两根木条,它们长分别为50cm,70cm,他要选择第三根木条,将它们钉成一个三角形木架,设第三根木条为xcm,则x的取值范是 .2,如果三角形的两边长分别是2和4,且第三边是奇数,那么第三边长为 ,如果第三边长为偶数,则次三角形的周长为.3,如果一个等腰三角形的两已知边长分别为4cm和9cm,则此等腰三角形的周长为 .4,已知五条线段长分别为1cm,2cm,3cm,4cm,5cm,以其中三条为边长可以构成个不同的三角形.5,在△ABC中,若∠B=∠C=40º,则∠A= .6,在△ABC中,∠ABC=90º,∠C=43º,则∠A= .7,在△ABC中,AD是角平分线,若∠B=50º,∠C=70 º,则∠ADC=.8,如果△ABC中,∠A:∠B:∠C=2:3:5,则此三角形按角分类应为 .9,直角三角形两锐角平分线相交所成的钝角为 .10,△ABC中,三边长为a,b,c,且a>b>c,若b=8,c=3,则a的取值范围是()A.3<a<8B.5<a<11C.8<a<11 D.6<a<1011,三角形中最大的内角不能小于( )A.30ºB.45º C.60ºD.90º12,在△ABC中,∠A=50º,∠B,∠C的平分线相交于0,则∠BOC的度数为( )A.65ºB.130ºC.115º D.100º13,如图所示,图中的三角形有( )A.6个 B.8个 C.10个D.12个 14,已知a,b,c为△ABC的三边,化简: |a+b-c|+|b-c-a|-|c-a-b|.15,三角形中有一边比第二条边长3cm,这条边又比第三条边短4cm,这个三角形的周长为28cm,求最短边的长。参考答案1,20<x<1202,3或5103,22cm 4,两5,100º6,47º 7,80º 8,直角三角形 9,135º 10,C11,C12,C 13,B 14,由a+b>c知,a+b-c>0,b-c-a=b-(a+c)<0,c-a-b=c-(a+b)<0,故|a+b-c|+|b-c-a|-|c-a+b|=a+b-c+a+c-b+a-b-c=3a-b-c15,设第二边长为xcm,则第一边长为(x+3)cm,第三边长为(x+7)cm,又x+x+3+x+7=3x+10=28,解得x=6cm即为最短边长.
上传时间:2023-04-30 页数:3
586人已阅读
(5星级)
《有理数》全章复习与巩固(基础)【学习目标】 1.理解正负数的意义,掌握有理数的概念.2.理解并会用有理数的加、减、乘、除和乘方五种运算法则进行有理数的混合运算. 3.学会借助数轴来理解绝对值、有理数比较大小等相关知识.4. 理解科学记数法及近似数的相关概念并能灵活应用.5. 体会数学知识中体现的一些数学思想.【知识网络】【要点梳理】要点一、有理数的相关概念 1.有理数的分类: (1)按定义分类:(2)按性质分类:要点诠释:(1)用正数、负数表示相反意义的量;(2)有理数0的作用:作用举例表示数的性质0是自然数、是有理数表示没有3个苹果用+3表示,没有苹果用0表示1表示某种状态 00C表示冰点表示正数与负数的界点0非正非负,是一个中性数2.数轴:规定了原点、正方向和单位长度的直线.要点诠释:(1)一切有理数都可以用数轴上的点表示出来,数轴上的点不都表示的是有理数,如.(2)在数轴上,右边的点所对应的数总比左边的点所对应的数大.3.相反数:只有符号不同的两个数互称为相反数,0的相反数是0. 要点诠释:(1)一对相反数在数轴上对应的点位于原点两侧,并且到原点的距离相等,这两点是关于原点对称的.(2)求任意一个数的相反数,只要在这个数的前面添上号即可.(3)多重符号的化简:数字前面号的个数若有偶数个时,化简结果为正,若有奇数个时,化简结果为负.4.绝对值:(1)代数意义:一个正数的绝对值是它本身;一个负数的绝对值是它的相反数;0的绝对值是0. 数a的绝对值记作a.(2)几何意义:一个数a的绝对值就是数轴上表示数a的点与原点的距离.要点二、有理数的运算 1 .法则:(1)加法法则:①同号两数相加,取相同的符号,并把绝对值相加.②绝对值不相等的异号两数相加,取绝对值较大的加数的符号,并用较大的绝对值减去较小的绝对值.③一个数同0相加,仍得这个数.(2)减法法则:减去一个数,等于加这个数的相反数.即a-b=a+(-b) .(3)乘法法则:①两数相乘,同号得正,异号得负,并把绝对值相乘.②任何数同0相乘,都得0.(4)除法法则:除以一个不等于0的数,等于乘这个数的倒数.即a÷b=a·1b(b≠0) .(5)乘方运算的符号法则:①负数的奇次幂是负数,负数的偶次幂是正数;②正数的任何次幂都是正数,0的任何非零次幂都是0. (6)有理数的混合运算顺序:①先乘方,再乘除,最后加减;②同级运算,从左到右进行;③如有括号,先做括号内的运算,按小括号、中括号、大括号依次进行.要点诠释:奇负偶正口诀的应用:(1)多重负号的化简,这里奇偶指的是-号的个数,例如:-[-(-3)]=-3,-[+(-3)]=3.(2)有理数乘法,当多个非零因数相乘时,这里奇偶指的是负因数的个数,正负指结果中积的符号,例如:(-3)×(-2)×(-6)=-36,而(-3)×(-2)×6=36.(3)有理数乘方,这里奇偶指的是指数,当底数为负数时,指数为奇数,则幂为负;指数为2偶数,则幂为正,例如: 2(3)9, 3(3)27.2.运算律: (1)交换律: ① 加法交换律:a+b=b+a; ②乘法交换律:ab=ba;(2)结合律: ①加法结合律: (a+b)+c=a+(b+c);②乘法结合律:(ab)c=a(bc) (3)分配律:a(b+c)=ab+ac要点三、有理数的大小比较比较大小常用的方法有:(1)数轴比较法;(2)法则比较法:正数大于0,0大于负数,正数大于负数;两个负数,绝对值大的反而小;(3) 作差比较法.(4)作商比较法;(5)倒数比较法.要点四、科学记数法、近似数及精确度 1.科学记数法:把一个大于10的数表示成10na的形式(其中110a,n是正整数),此种记法叫做科学记数法.例如:200 000=5210.2.近似数:接近准确数而不等于准确数的数,叫做这个精确数的近似数或近似值.如长江的长约为6300㎞,这里的6300㎞就是近似数.要点诠释:一般采用四舍五入法取近似数,只要看要保留位数的下一位是舍还是入.3.精确度:一个近似数四舍五入到哪一位,就称这个数精确到哪一位,精确到的这一位也叫做这个近似数的精确度. 要点诠释:(1)精确度是指近似数与准确数的接近程度.(2)精确度有两种形式:①精确到哪一位.②保留几个有效数字.这两种的形式的意义不一样,一般来说精确到哪一位可以表示误差绝对值的大小,例如精确到0.1米,说明结果与实际数相差不超过0.05米,而有效数字往往用来比较几个近似数哪个更精确些.【典型例题】类型一、有理数相关概念1.若一个有理数的:(1)相反数;(2)倒数;(3)绝对值;(4)平方;(5)立方,等于它本身.则这个数分
上传时间:2023-04-30 页数:6
586人已阅读
(5星级)
世界TOP50初级启蒙绘本Where Is the Green Sheep.pdf
上传时间:2024-02-03 页数:32
585人已阅读
(5星级)
二○二一年齐齐哈尔市初中学业考试道德与法治试卷考生注意:1.全卷共四道大题,总分100分2.使用答题卡的考生,请将答案填写在答题卡的指定位置一、单项选择题(下列各题的四个选项中,只有一项是最符合题意的,请选出来。每小题2分,共50分)1. 中学生要把握机遇,从点滴做起,为实现远大理想()A. 不懈努力B. 听天由命C. 拒绝帮助D. 依赖父母【答案】A【解析】【详解】本题考查对实现梦想的认识和理解。A:依据教材知识,中学生要把握机遇,从点滴做起,为实现远大理想而不懈努力,故A说法正确;BCD:这都是错误的行为方式,故说法错误;故本题选A。2. 漫画启示我们()A. 孝敬父母就是在经济上供养B. 关爱家人是长大成人以后的事C. 孝敬父母就是要对父母百依百顺D. 尽孝在当下,我们应该用行动表达孝敬之心【答案】D【解析】【详解】本题考查对孝敬父母的认识和把握。D:根据题文漫画,小姑娘主动帮妈妈分担家务,这体现了尽孝在当下,我们应该用行动表达孝敬之心,所以D说法正确;ABC:孝敬父母就是在各方面关心父母,不仅是经济上供养;关爱家人是要从现在做起,不是长大成人以后的事;孝敬父母是听取父母合理的意见,但不是要对父母百依百顺,故ABC说法错误;故本题选D。3. 生得再平凡,也是限量版。这句话强调生命是()A. 有接续的B. 独特的C. 不可逆的D. 短暂的【答案】B【解析】【详解】本题考查生命的特点。B:生得再平凡,也是限量版。限量版说明了生命是独特的,都是无可取代的,B说法正确;ACD:题干表述的主旨均没有体现生命的来之不易,生命的不可逆性,以及生命是短暂的,不符合题意;故本题选B。4. 有人说:青春,是与七个自己相遇。一个明媚,一个忧伤,一个华丽,一个冒险,一个倔强,一个柔软,最后那个正在成长。对此理解正确的是()A. 青春是美好的,要尽情享乐不留遗憾B. 青春期的矛盾心理对我们只会产生消极的心理影响C. 青春是人生重要的过渡阶段,要做到生理与心理协调发展D. 青春是一个成长的过程,在这个过程中我们要事事追求完美【答案】C【解析】【详解】本题考查对青春的认识和把握。C:根据题文青春,是与七个自己相遇。一个明媚,一个忧伤,一个华丽,一个冒险,一个倔强,一个柔软,最后那个正在成长,这说明青春是人生重要的过渡阶段,要做到生理与心理协调发展,所以C说法正确;ABD:青春是美好的,要尽情享乐不留遗憾,说法过于绝对;青春期的矛盾心理对我们只会产生消极的心理影响,矛盾心理是把双刃剑,不仅仅有消极影响;青春是一个成长的过程,在这个过程中我们不必事事追求完美,故ABD说法错误;故本题选C。5. 观看一部扣人心弦的枪战片时,会兴奋、紧张;完成一项任务或工作后,会喜悦、轻松;遇到别人误解时,会委屈、伤心。我们的这些感受就是()A. 自尊B. 自强C. 情绪D. 情趣【答案】C【解析】【分析】【详解】此题旨在考查学生对情绪的认识。A:自尊即自我尊重与爱护,是一种健康良好的心理状态。A选项与题干主旨不符。B:自强是一种精神,是一种高尚的道德品质。克服自己的弱点,战胜自己、超越自己,是自强的重要内容。题干未体现自强的内容,B选项不符合题意。C:根据教材知识,人的情绪的复杂多变的,基本类型包括喜、怒、哀、惧。题文中的人物在各种情形和环境下的兴奋、紧张、喜悦、委屈、伤心等反应,实质上都属于人的情绪,C选项正确,符合题意。D:情趣指志趣、志向或情调趣味,情趣有高雅、低俗之分。题干并未涉及情趣的内容,D选项不符合题意。故本题选C。【点睛】本题属于基础知识的考查与理解,审清题意、把握自尊、自强、情绪、情趣的意义。结合材料仔细分析总结,做出正确选择。6. 学习过集体生活是我们青春成长的必经之路。下列观点正确的是()A. 集体建设需要个人英雄主义B. 集体生活成就我C. 个人和集体没有任何矛盾冲突D. 集体成员之间不存在竞争【答案】B【解析】【详解】本题考查对集体的认识和把握。B:根据所学知识,集体生活成就我,集体生活可以培养我们的品格、发展自己的个性,所以C说法正确;ACD:集体建设需要每个人努力,不能仅仅依靠个人英雄主义;个人和集体有矛盾冲突,但根本利益是一致的;集体成员之间既有合作也有竞争,故ACD说法错误;故本题选B。7. 专门保护未成年人的法律是()A. 宪法和预防未成年人犯罪法B. 宪法和未成年人保护法C. 未成年人保护法和教育法D. 未成年人保护法和预防未成年人犯罪法【答案】D【解析】【详解】本题考查对未成年人保护的认识和理解。ABCD:依据教材知识,我国颁布了未成年人保护法、预防未成年人犯罪法等专门法律,给予未成年人特殊关爱和保护。故D说法正确,ABC说法错误;故本题选D。8. 时代车轮滚滚
上传时间:2023-05-08 页数:19
585人已阅读
(5星级)
中考总复习:特殊的四边形--巩固练习(基础)【巩固练习】一、选择题1.(2014•天水)如图,将矩形纸片ABCD折叠,使点D与点B重合,点C落在C′处,折痕为EF,若AB=1,BC=2,则△ABE和BC′F的周长之和为()A.3B.4C.6D.82.如图,有一矩形纸片ABCD,AB=10,AD=6,将纸片折叠,使AD边落在AB边上,折痕为AE,再将△AED以DE为折痕向右折叠,AE与BC交于点F,则△CEF面积为().A.4 B.6 C.8 D.103.如图所示,在矩形ABCD中,AB=3,AD=4,P是AD上的一点,PE⊥AC,垂足为E,PF⊥BD,垂足为F,则PE+PF的值为().A. B. C.2 D. 第3题第4题 4.如图,E、F、G、H分别是四边形ABCD四条边的中点,要使EFGH为矩形,四边形应该具备的条件是().A.一组对边平行而另一组对边不平行 B.对角线相等C.对角线相互垂直 D.对角线互相平分5.如图,正方形ABCD中,O是对角线AC、BD的交点,过O点作OE⊥OF分别交AB、BC于E、F,若AE=4,CF=3,则EF等于( ). A.7 B.5 C.4 D.31第5题第6题6.如图,在矩形ABCD中,DE⊥AC于E,且∠ADE:∠EDC=3:2,则∠BDE的度数为( ).A.15° B.18° C.36° D.54°二、填空题7.(2014春•西城区期末)直角△ABC中,∠BAC=90°,D、E、F分别为AB、BC、AC的中点,已知DF=3,则AE= . 8. 如图,菱形ABCD中,于E,于F,,则等于___________.9. 正方形ABCD中,E为BC上一点,BE=,CE=,P在BD上,则PE+PC的最小值可能为__________.10.如图,M为正方形ABCD中BC边的中点,将正方形折起,使点A与M重合,设折痕为EF,若正方形的面积为64,则△AEM的面积为____________.11.如图,△ABC是以AB为斜边的直角三角形,AC=4,BC=3,P为AB上一动点,且PE⊥AC于E,PF⊥BC于F,则线段EF长度的最小值是_______________. 第10题第11题第12题212.如图,在直角梯形ABCD中,AD∥BC,∠ABC=90°,∠C=60°,BC=2AD=2,点E是BC边的中点,△DEF是等边三角形,DF交AB于点G,则△BFG的周长为________.三、解答题13.如图1,图2,四边形ABCD是正方形,M是AB延长线上一点.直角三角尺的一条直角边经过点D,且直角顶点E在AB边上滑动(点E不与点A,B重合),另一条直角边与∠CBM的平分线BF相交于点F. (1)如图1,当点E在AB边的中点位置时: ①猜想DE与EF满足的数量关系是__________; ②连接点E与AD边的中点N,猜想NE与BF满足的数量关系是__________; ③请证明你的上述两个猜想. (2)如图2,当点E在AB边上的任意位置时,请你在AD边上找到一点N,使得NE=BF,进而猜想此 时DE与EF有怎样的数量关系. 14. 如图,在梯形ABCD中,AD//BC,AB=CD=3cm,∠A=120°,BD⊥CD, (1)求BC、AD的长度; (2)若点P从点B开始沿BC边向点C以2cm/秒的速度运动,点Q从点C开始沿CD边向点D以1cm/秒的速度运动,当P、Q分别从B、C同时出发时,写出五边形ABPQD的面积S与运动时间t之间的关系式,并写出t的取值范围(不包含点P在B、C两点的情况);(3)在(2)的前提下,是否存在某一时刻t,使线段PQ把梯形ABCD分成两部分的面积比为1:5?若存在,求出t的值;若不存在,请说明理由. 315. (2015•青岛模拟)已知正方形ABCD的边长为a,两条对角线AC、BD相交于点O,P是射线AB上任意一点,过P点分别作直线AC、BD的垂线PE、PF,垂足为E、F.(1)如图1,当P点在线段AB上时,PE+PF的值是否为定值?如果是,请求出它的值;如果不是,请加以说明.(2)如图2,当P点在线段AB的延长线上时,求PE﹣PF的值.
上传时间:2023-04-30 页数:8
585人已阅读
(5星级)
2023年1月普通高等学校招生全国统一考试英语选择题部分第一部分听力(共两节,满分30分)做题时,先将答案标在试卷上。录音内容结束后,你将有两分钟的时间将试卷上的答案转涂到答题纸上。第一节(共5小题;每小题1.5分,满分7.5分)听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。1. 【此处可播放相关音频,请去附件查看】What will the speakers do next?A. Visit a friend.B. Pick up Billy.C. Buy some beans.【答案】C【解析】【原文】M: Billy needs some beans for his science project at school. Maybe we can stop by a store on our wayhome.W: Lets go to Greens. Its just around the corner.M: Okay.2. 【此处可播放相关音频,请去附件查看】Who is Andy Clarks?A. A public librarian.B. A TV actor.C. A famous lawyer.【答案】B【解析】【原文】W: Hi, Stephen, guess who I saw at the city library? Andy Clarkes — the leading actor in The GoodLawyer — the famous TV series.M: What was he doing there? His popularity has slipped since the final season of the show.3. 【此处可播放相关音频,请去附件查看】What are the speakers talking about?A. Gifts for Jason.B. A baseball game.C. The woman's retirement.【答案】A【解析】【原文】W: It seems as if everybody is talking about Jasons retirement.M: Yes, his office is filled with gifts. I gave him a T-shirt with a baseball pattern on it.W: Thats nice. Ill get him something this afternoon. Hope its not late.4. 【此处可播放相关音频,请去附件查看】What went on at Cooper's last night?A. A movie show.B. A birthday party.C. A sales promotion.【答案】C【解析】【原文】W: Did you go to Coopers last night?M: No, was there anything special?W: Yes, the employees dressed up as movie characters, and every customer received a discount card.M: That was interesting.5. 【此处可播放相关音频,请去附件查看】What problem do the speakers have?A. They are late for work.B. They get stuck in traffic.C. They have lost their way.【答案】B【解析】【原文】W: Oh, the road is jammed with traffic again. We are going to be late for work.M: Lets make a U-turn at the next crossroads and try another way.第二节(共15小题:每小题1.5分,满分22.5分)听下面5段对话或独白。每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项。听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟:听完后,各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听下面一段较长对话,回答以下小题。【此处可播放相关音频,请去附件查看】6. Where are the speakers?A. At home.B. At the
上传时间:2024-02-21 页数:25
584人已阅读
(5星级)
1 2 Title Page Copyright3First Page4Mothers Day was coming, and Mama Bear knew that Papa and the cubs were going to surprise her with a special celebration. 5Last year they took her out for a special Mothers Day dinner. 6Mama was pretty sure that this year they were going to surprise her with a special Mothers Day breakfast in bed. 7And alas, she also knew that she would probably have to spend the rest of Mothers Day cleaning up the mess they made preparing her special breakfast in bed. But that was okay. Its the thought that counts. 8The signs of Papa and the cubs Mothers Day plan werent hard to read. There was a marker in the cookbook at the page for Mamas favorite breakfast: Honeyed French Toast with Blueberries. 9And one day when they were shopping at the Beartown Mart, she saw the cubs slip off in the direction of the card department. 10As Mothers Day drew closer, Mama knew that she had a lot to do if her familys Mothers Day surprise was going to be a success. 11First, she had to find the old bed tray they used when a family member was ill. She found it at the top of one of the kitchen cabinets where she kept jars and bottles that were too nice to throw away. 12It had some oatmeal on it from when Papa had been in bed with a cold. She scraped off the oatmeal and put the bed tray where she knew Papa and the cubs could find it. 13But there was more to do. She had to make sure they would have the ingredients to make her special Mothers Day surprise. She checked the recipe in the cookbook. 14Honeyed French Toast with Blueberries called for honey, bread, eggs, sweet cream, sweet butter, powdered sugar, and blueberries. 15It was Papa and the cubs favorite breakfast, too. But that was okay. Its the thought that counts. As for the mess they would make in the kitchen—well, that just came with being a mama. 16Mama checked the cupboard. There was honey, of course, and plenty of bread. 17There was powdered sugar, too. Bu
上传时间:2024-02-02 页数:51
584人已阅读
(5星级)
Star Wars - A New Hope (1997 Golden Book) (Brainiac-Darwin).pdf
上传时间:2024-04-06 页数:28
583人已阅读
(5星级)
72本贝贝熊早教英文绘本之Berenstain_Bears_and_the_Bad_Dream.pdf
上传时间:2024-02-02 页数:34
583人已阅读
(5星级)
2021年安徽省初中学业水平考试英语试题注意事项:1.本试卷共四部分,十大题,满分120 分。考试时间为120分钟。2全卷包括 试题卷(8页)和 答题卡(2页)两部分。3.请务必在 答题卡上答题,在 试题卷上答题无效。4考试结束后,请将 试题卷和 答题卡一并交回。第一部分 听力(共四大题,满20分)Ⅰ.短对话理解(共5小题:每小题1分,满分5分)你将听到五段对话,每段对话后有一个小题。请在每小题所给的A、B、C三个选项中选出一个最佳选项。每段对话读两遍。1. What does the man want to have?A. B. C. 2. What sport does Gorge like?A. B. C. 3. Haw did Ton go to school this morning?A. By busB. On footC By bike4. What time is it now?A. 8: 15. B.8: 30.C.8: 45.5. What is the relationship between the speakers?A. Boss and secretary. B. Doctor and patients. C. Guide and tourist.Ⅱ. 长对话理解(共5小题,每小题1分,满分5分)你将听到两段对话,每段对话后几个小题。请在每小题所给的A、B、C三个选项中选出一个最佳选项。每段对话读两遍。听下面一段对话,回答下列小题。6. What colour is the mans shirt?A. Grey.B. Black.C. White.7. Where does the conversation probably take Place?A. In a shop. B. In an office. C In a restaurant听下面一段对话,回答下列小题。8. Whats the weather like now?A. Sunny B. Rainy C. Cloudy9. What does the man want to buy for his mother?A. A scarf.B. A watchC. A hat10. When will the man probably take a part-time job?A. This weekend.B. This winter vacation. C This summer vacation.Ⅲ.短文理解(共5小题;每小题1分,满分5分)你将听到一篇短文,短文后有五个小题。请根据短文内容,在每小题所给的A、B、C三个选项中选出一个最佳选项。短文读两遍。11. How long did the competition last?A. Two days B. Thee days C. Five days12. Why was Li Hua nervous before the competition?A. Because he didnt sleep well.B. Because he didnt have enough time.C. Because he didnt know how to prepare for it.13. Who made a suggestion to Li Hua before the competition?A. His motherB. His classmatesC His teacher14. Where did Li Hua get information for the speech?A. On TVB. On the Internet C. In a book15. How did Li Hua feel about the result of the competition?A Surprised. B. Proud. C. Happy.IV.信息转换(共5小题,每小题1分,满分5分)你将听到一篇短文。请根据短文内容,写出下面表格中所缺的单词,每空仅填一词。短文读两遍。Ways to show16 Give small17 That connects you and other.Encourage others.That gives to them18 .Of
上传时间:2023-05-09 页数:11
583人已阅读
(5星级)
福建省2022年高考化学试题1. 福建多个科研机构经过长期联合研究发现,使用和改性的基催化剂,可打通从合成气经草酸二甲酯常压催化加氢制备乙二醇的技术难关。下列说法正确的是A. 草酸属于无机物B. 与石墨互为同分异构体C. 属于过渡元素D. 催化剂通过降低焓变加快反应速率2. 络塞维是中药玫瑰红景天中含有的一种天然产物,分子结构见下图。关于该化合物下列说法正确的是A. 不能发生消去反应B. 能与醋酸发生酯化反应C. 所有原子都处于同一平面D. 络塞维最多能与反应 3. 常温常压下,电化学还原制氨气的总反应方程式:,设为阿伏加德罗常数的值,下列说法正确的是A. 水中含有的孤电子对数为B. 每产生失去的电子数为C. 氨水中,含有的分子数少于D. 消耗(己折算为标况)时,产生的分子数为4. 某非线性光学晶体由钾元素(K)和原子序数依次增大的X、Y、Z、W四种短周期元素组成。X与Y、Z与W均为同周期相邻元素,X的核外电子总数为最外层电子数的2倍,Z为地壳中含量最多的元素。下列说法正确的是A. 简单氢化物沸点:B. 分子的空间构型为三角锥形第1页/共11页学科网(北京)股份有限公司 C. 原子半径:D. 最高价氧化物对应水化物的碱性:5. 探究醋酸浓度与电离度关系的步骤如下,与相关步骤对应的操作或叙述正确的步骤操作或叙述AⅠ.用标准溶液标定醋酸溶液浓度滴定时应始终注视滴定管中的液面BⅡ.用标定后的溶液配制不同浓度的醋酸溶液应使用干燥的容量瓶CⅢ.测定步骤Ⅰ中所得溶液的应在相同温度下测定DⅣ.计算不同浓度溶液中醋酸的电离度计算式为A. AB. BC. CD. D6. 用铬铁合金(含少量单质)生产硫酸铬的工艺流程如下:下列说法错误的是A. 浸出产生的气体含有B. 除杂的目的是除去元素C. 流程中未产生六价铬化合物D. 滤渣2的主要成分是7. 锂辉石是锂的重要来源,其焙烧后的酸性浸出液中含有和杂质离子,可在0~14范围内调节对其净化(即相关离子浓度)。时,与关系见下图(碱性过强时和会部分溶解)。下列说法正确的是第2页/共11页学科网(北京)股份有限公司 A. 可被净化的区间最大B. 加入适量,可进一步提升净化程度C. 净化的先后顺序:D. 8. 实验室需对少量污染物进行处理。以下处理方法和对应的反应方程式均错误的是A. 用硫磺处理洒落在地上的水银:B. 用盐酸处理银镜反应后试管内壁的金属银:C. 用烧碱溶液吸收蔗糖与浓硫酸反应产生的刺激性气体:D. 用烧碱溶液吸收电解饱和食盐水时阳极产生的气体:9. 一种化学自充电的锌-有机物电池,电解质为和水溶液。将电池暴露于空气中,某电极无需外接电源即能实现化学自充电,该电极充放电原理如下图所示。下列说法正确的是第3页/共11页学科网(北京)股份有限公司 A. 化学自充电时,增大B. 化学自充电时,电能转化为化学能C. 化学自充电时,锌电极反应式:D. 放电时,外电路通过电子,正极材料损耗10. 氨是水体污染物的主要成分之一,工业上可用次氯酸盐作处理剂,有关反应可表示为:①②在一定条件下模拟处理氨氮废水:将的氨水分别和不同量的混合,测得溶液中氨去除率、总氮(氨氮和硝氮的总和)残余率与投入量(用x表示)的关系如下图所示。下列说法正确的是第4页/共11页学科网(北京)股份有限公司 A. 的数值为0.009B. 时,C. 时,x越大,生成的量越少D. 时,11. 粉煤灰是火电厂的大宗固废。以某电厂的粉煤灰为原料(主要含和等)提铝的工艺流程如下:回答下列问题:(1)浸出时适当升温的主要目的是_______,发生反应的离子方程式为_______。(2)浸渣的主要成分除残余外,还有_______。实验测得,粉煤灰(的质量分数为)经浸出、干燥后得到浸渣(的质量分数为),的浸出率为_______。(3)沉铝时,体系中三种物质的溶解度曲线如下图所示,加入沉铝的目的是_______,沉铝的最佳方案为_______。第5页/共11页学科网(北京)股份有限公司 (4)焙烧时,主要反应的化学方程式为_______。(5)水浸后得到的滤液2可返回_______工序循环使用。12. 某兴趣小组设计实验探究,催化空气氧化的效率。回答下列问题:步骤Ⅰ制备在通风橱中用下图装置制备(加热及夹持装置省略),反应方程式:(1)装置A中盛放甲酸的仪器的名称是_______。(2)从B、C、D中选择合造的装置收集,正确的接口连接顺序为a→_______→_______→_______→_______→h(每空填一个接口标号)。______步骤Ⅱ检验将通入新制银氨溶液中,有黑色沉淀生成。(3)该反应的化学方程式为_______。步骤Ⅲ探究催化空气氧化的效率第6页/共11
上传时间:2024-02-18 页数:11
582人已阅读
(5星级)
582人已阅读
(5星级)
582人已阅读
(5星级)
2022天津高考真题一、单项选择1. —I worked on your car the whole night. How is it running?— It is running great! _____________. You were such a big help!A. Its a pityB. I couldnt agree moreC. Forget itD. I can hardly thank you enough2. Food and medical supplies________ to all the residents after the hurricane last Sunday.A. distributeB. distributedC. are distributedD. were distributed3. ________ we achieve great success in our work, we should not be too proud.A. Ever sinceB. Even ifC. In caseD. As though4. ________ gardening may be hard physical work, those who love it find it very relaxing mentally.A. AlthoughB. OnceC. SinceD. Unless5. Critical reasoning, together with problem-solving, ________ teenagers to make better decisions.A. prepareB. preparesC. is preparingD. are preparing6. ________ his restless students occupied with an indoor sport on rainy days, James Naismith created basketball.A. To be keptB. KeptC. To keepD. Keeping7. The children failed to hide their disappointment when they found out the school________ the party.A. cancelsB. will cancelC. has cancelledD. had cancelled8. When people are depressed, some experience a loss of________ while others cant stop eating.A. appetiteB. powerC. memoryD. sight9. The city temperatures have returned from record low to normal, ________ the citizens to enjoy the outdoors again.A. allowingB. being allowedC. having allowedD. having been allowed10. The experienced climber was________ the potential danger in such extreme weather and decided to wait until the following day.A. completely blind toB. totally lost inC. pretty keen onD. well aware of11. Mental health involves________ you procees things such as stress and anxiety.A. howB. whatC. whyD. which12. Im far________ and Ill never get this report done by Friday.A. below surfaceB. beyond controlC. behind scheduleD. above average13. If we continue to________ environmental problems, we will regret it sooner or later.A. highlightB. identifyC. ignoreD. prevent14. —Angela just doesnt
上传时间:2024-02-21 页数:12
581人已阅读
(5星级)
客服
客服QQ:
2505027264
客服电话:
18182295159(不支持接听,可加微信)
微信小程序
微信公众号
回到顶部