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【练习】2021届高三英语下学期限时训练一有详解

【练习】2021届高三英语下学期限时训练一有详解

高三英语限时训练一总分65分第一部分:阅读理解(共两节,满分30分)第一节(共7个小题:每小题2.5分,满分17.5分)AWhat do the random, scribbled(潦草的)drawings crowding the margins(页边空白)of most high school students’ papers mean? When a student is caught doodling(乱画)in class, he will probably be criticized for daydreaming. But doodling while listening can help with remembering details, rather than implying that the mind is wandering, according to a study published in the scientific journal Applied Cognitive Psychology.In an experiment conducted b y the Medical Research Council’s Cognition and Brain Sciences Unit in Cambridge,40 subjects were asked to listen to a two-minute tape giving several names of people and places. Half of the participants were asked to shade in shapes on a piece of paper at the same time, without paying attention to neatness, while the rest were given no such instructions. After the tape had finished, all participants in the study were asked to recall the names of people and places. The doodlers recalled on average 7.5 names of people and places, compared to only 5.8 by the non-doodlers.“If someone is doing a boring task, like listening to a dull telephone conversation, they may start to daydream.” said study researcher, Professor Jackie Andrade, of the School of Psychology, U niversity of Plymouth. “Daydreaming distracts them from the task, resulting in poorer performance. A simple task, like doodling, may be enough tostop daydreaming without affecting performance on the main task.”“In psychology, tests of memory or attention will often use a second task to selectively block a particular mental process. If that process is important for the main task, then performance will be weakened. But my research suggests that in everyday life doodling may be something we do because it helps to keep us on track with a boring task, rather than being an unnecessary distraction(分心)that we should try to resist doing.” said Andrade.Dan Ware, a social study teacher, used to consider doodling a distraction from learning, but after teaching kids with all personality types he learned scribbling away during lectures helps certain students remember more information. “In my first few years of teaching, I thought, ‘Well, this kid isn’t paying attention. He’s daydreaming.’ But I had some really powerful experiences with students and came to understand in many cases that was their way of focusing, and those students were probably paying more attention than other students.” Ware said.1. What do we know about the participants involved in the experiment?A. Some were asked to note down the information neatly.B. Some were asked to memorize the names they would hear.C. Some were instructed to listen to the tape with full attention.D. Some were instructed to make random drawings on paper.2. Which of the following will both Jackie Andrade and Dan Ware agree with?A. Doodling helps some people focus.B. Doodling makes a dull task interesting.C. Students who doodle perform poorly.D. Students who doodle lack concentration.3. What is the best title of the text?A. Daydreaming Can Sharpen Study SkillsB. Doodling Can Help Memory RecallC. A Wandering Mind Improves ProductivityD. Distractions Harm Academic PerformanceBShyness is the cause of much unhappiness for a great many people. Shy people are anxious and self-conscious; that is, they are concerned about their own appearance and actions too much. Negative thoughts are constantly occurring in their minds: What kind of impression am I making? Do they like me? Do I sound stupid? Am I wearing unattractive clothes?It is obvious that such uncomfortable feelings must affect people unfavorably. A person’s self-concept is reflected in the way he or she behaves and the way a person behaves affects other people’s reactions. In general, the way people think about themselves has a deep effect on all areas of their lives.Shy people, who have low respect, are likely to be passive and easily influenced by others. They need faith that they are doing "the right thing". Shy people are very sensitive to criticism. It makes them feel inferior(自卑). They also find it difficult to be pleased by praises because they believe they are unworthy of praise. A shy person may respond to a praise with a statement like this one: "You’re just saying that to make me feel good. I kn ow it’s not true."It is clear that, while self-awareness is a healthy quality, overdoing it is harmful.Can shyness be completely got rid of, or at least reduced? Fortunately, people can overcome shyness with determination since shyness goes hand in hand with lack ofself-respect. It is important for people to accept their weaknesses as well as their strengths. Each one of us has his or her own characteristics. We are interested in our own personal ways. The better we understand ourselves, the easier it becomes to live up to our chances for a rich and successful life.4. The first paragraph is mainly about ____________. .A. the cause of shynessB. the effect of shyness on peopleC. the feelings of shy peopleD. the questions in the minds of shy people5. According to the writer, self-awareness is ____________.A. harmful to peopleB. a weak point of peopleC. the cause of unhappinessD. a good characteristic6. What is the shy people’s reaction to praise?A. They are pleased by it. B They feel it is not true.C. They are very sensitive to it.D. They feel they are worthy of it.7. We can learn from the passage that shyness ____________.A. blocks our chances for a successful lifeB. helps us to live up to our full developmentC. enables us to understand ourselves betterD. has nothing to do with lack of self-respect第二节七选五(共5小题,每小题2.5分,满分12.5分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。

2024-2025学年人教版数学九年级数学上册限时训练(试卷)

2024-2025学年人教版数学九年级数学上册限时训练(试卷)

2024-2025学年人教版数学九年级数学上册限时训练(试卷)一、单选题1.下列方程是一元二次方程的是()A .ax 2+bx +c =0B .3x+x 2﹣1=0C .2x 2﹣x +2=0D .4x ﹣1=02.下列函数中,y 一定是x 的二次函数的是()A .y=-x 2+1B .y=ax 2+bx+cC .23y x =+D .x 2y=13.下列关于抛物线y=﹣(x ﹣5)2+2有关性质的说法,错误的是()A .对称轴是直线x=5B .开口向下C .与x 轴有交点D .最小值是24.一元二次方程230x x -+=根的情况是()A .有两个不相等的实数根B .有两个异号的实数根C .有两个相等的实数根D .没有实数根5.抛物线y=(x+2)2﹣3可以由抛物线y=x 2平移得到,则下列平移过程正确的是()A .先向左平移2个单位,再向上平移3个单位B .先向左平移2个单位,再向下平移3个单位C .先向右平移2个单位,再向下平移3个单位D .先向右平移2个单位,再向上平移3个单位6.如图,某小区计划在一块长为32m ,宽为20m 的矩形空地上修建三条同样宽的道路,剩余的空地上种植草坪,使草坪的面积为570m 2.若设道路的宽为x m ,则下面所列方程正确的是().A .(32﹣2x )(20﹣x )=570B .32x +2×20x =32×20﹣570C .(32﹣x )(20﹣x )=32×20﹣570D .32x +2×20x ﹣2x 2=5707.若1x ,2x 为方程2410x x -=+的两个根,则1212x x x x ++的值为()A .5B .5-C .3-D .38.我国的乒乓球“梦之队”在巴黎奥运赛场上大放异彩,奥运会乒乓球比赛的第一阶段是团体赛,赛制为单循环赛(每两队之间都赛一场).计划分为4组,每组安排28场比赛,设每组邀请x 个球队参加比赛,可列方程得()A .()128x x +=B .()128x x -=C .()11282x x +=D .()11282x x -=9.已知抛物线y 12=(x ﹣2)2+k 上有三点,A (3,y 1),B (﹣1,y 2),C (2,y 3),则y 1,y 2,y 3的大小关系为()A .y 1>y 2>y 3B .y 3>y 2>y 1C .y 2>y 3>y 1D .y 2>y 1>y 310.如图,抛物线2y ax bx c =++的对称轴是直线1x =,则以下三个结论:①0ac <,②20a b +=,③<0a b c -+,其中正确的结论()A .0个B .1个C .2个D .3个二、填空题11.抛物线21y x -=与x 轴的交点坐标是.12.如图是二次函数2y ax bx c =++的部分图像,由图像可知不等式20ax bx c ++>的解是.13.某校图书馆利用节假日面向社会开放.据统计,第一个月进馆500人次,进馆人次逐月增加,第三个月进馆720人次,设该图书馆第二个月、第三个月进馆人次的平均增长率为x ,则可列方程为.14.已知等腰三角形的底边长为9,腰是方程210240x x -+=的一个根,则这个三角形的周长为.15.若10b -=,且一元二次方程20kx ax b ++=有实数根,则k 的取值范围是.三、解答题16.解方程:23210x x +-=17.已知二次函数223y x x =+-.(1)将223y x x =+-写成2()y a x h k =-+的形式,并写出它的顶点坐标;(2)当40x -<<时,直接写出函数值y 的取值范围;18.已知二次函数图象的顶点坐标是()1,4--,且经过点()1,0,求该二次函数的解析式.19.如图,二次函数2y x bx c =-++的图象与x 轴交于点A 、点B ,与y 轴交于点C ,其中()()3,00,3A C ,.(1)求二次函数的解析式;(2)若点P 在二次函数图象上,且6AOP S =V ,求点P 的坐标.20.如图,在Rt ABC △中,90C ∠=︒,6cm AC =,8cm BC =.点P 、Q 同时由A 、C 两点出发,分别以1cm s 和2cm s 的速度沿线段AC 、CB 匀速移动,当一点到达终点时,另一点也停止移动.(1)设经过t 秒,用含t 的代数式表示PC 、CQ .PC =______、CQ =______.(2)几秒后,PCQ △的面积是ABC V 面积的1321.如图,现打算用60m 的篱笆围成一个“日”字形菜园ABCD (含隔离栏EF ),菜园的一面靠墙MN ()39m (篱笆的宽度忽略不计)(1)菜园面积可能为2252m 吗?若可能,求边长AB 的长,若不可能,请说明理由;(2)因场地限制,菜园的宽度AB 不能超过8m ,求该菜园面积的最大值.22.某超市销售一种商品,成本价为30元/千克,经市场调查,每天销售量y (千克)与销售单价x (元/千克)之间满足一次函数关系180y x =-+,规定每千克售价不能低于30元,且不高于80元.(1)如果该超市销售这种商品每天获得3600元的利润,那么该商品的销售单价为多少元?(2)设每天的总利润为w 元,当销售单价定为多少元时,该超市每天的利润最大?最大利润是多少元?23.阅读下面的材料:我们可以用配方法求一个二次三项式的最大值或最小值,例如:求代数式225a a -+的最小值.方法如下:∵()2222521414a a a a a -+=-++=-+,由()210a -≥,得()2144a -+≥;∴代数式225a a -+的最小值是4.(1)仿照上述方法求代数式2107x x ++的最小值.(2)代数式2816a a --+有最大值还是最小值?请用配方法求出这个最值.24.已知关于x 的一元二次方程x 2+mx+m ﹣2=0.(1)求证:无论m 取任何实数,此方程总有两个不相等的实数根;(2)设x2+mx+m﹣2=0的两个实数根为x1,x2,若y=x12+x22+4x1x2,求出y与m的函数关系式;(3)在(2)的条件下,若﹣1≤m≤2时,求y的取值范围.。

新视野海之星语文限时训练八年级答案

新视野海之星语文限时训练八年级答案

新视野海之星语文限时训练八年级答案1、1肖像描写即描写人物的外貌特征,它包括人物的身材、容貌、服饰、打扮以及表情、仪态、风度等。

[判断题] *对(正确答案)错2、1《拿来主义》一文主要论证方法是举例论证。

此文采用先破后立的论证,在反对和批判“闭关主义”和“送去主义”的过程中确立了拿来主义的观点。

[判断题] *对(正确答案)错3、下列各组句子中,加点词的意义和用法相同的一项是()[单选题] *A.让大行不顾细谨,大礼不辞小让使者大喜,如惠语以让单于B.息请息交以绝游门衰祚薄,晚有儿息C.直直不百步耳,是亦走也直好世俗之乐耳(正确答案)D.族族秦者秦也,非天下也山东豪俊遂并起而亡秦族矣4、1与李白并称“李杜”的是杜牧。

[判断题] *对(正确答案)错5、1《卖白菜》作者莫言,当代作家,原名管谟业,是第一个获得诺贝尔文学奖的中国籍作家,代表作有《红高粱》《蛙》《生死疲劳》等。

[判断题] *对错(正确答案)6、32. 下面加双引号的词语运用不正确的一项是()[单选题] *A.一些出版单位急功近利,出版的童书内容“良莠不齐”,画面也不够精美。

B.从出人凭证电子管理到机器人服务,再到无人机监控,科技让疫情防控“事倍功半”。

(正确答案)C.在草原上,一条突然出现的小溪,一阵“不期而至”的微风,都会令她激动不已。

D.在李白的诗中,这种看似“妙手偶得”的佳句比比皆是。

7、40. 下列词语中加双引号字的读音完全正确的一项是()[单选题] *A.“翩”然(piān)记“载”(zǎi)流“逝”(shì)“戛”然而止(giá)B.农“谚”(yàn)“萌”发(méng)悬“殊”(shū)阳奉阴“违”(wéi)(正确答案) C.骨“骼”(gé)“漂”移(piāo)连“翘”(qiào)招摇“撞”骗(zhuàng)D.“携”带(xié)两“栖”(xī)“彗”星(huì)“瞬”息万变(shùn)8、41. 下列词语中没有错别字的一项是()[单选题] *A.皎洁暖融融海枯石滥目空一切B.诲暗生态学天衣无缝叹为观止C.蓦然榆叶梅衰草连天不可抗拒(正确答案)D.幅射平流层悬崖绝壁光明正大9、“可叹停机德,堪怜咏絮才。

病句的辨析限时训练+++2023年中考语文一轮复习基础过关

病句的辨析限时训练+++2023年中考语文一轮复习基础过关

2023中考语文一轮复习基础过关病句的辨析限时训练时间:40分钟,满分:70分1.下列句子没有语病的一项是()A.这些蔬菜长得这么好,是由于社员们精心管理的结果。

B.近年来,我国重大科研项目捷报频传,增强了我们民族的科技自信和广阔前景。

C.“一带一路”国际合作高峰论坛,是一次共商合作大计、共建合作平台、共享合作成果。

D.传统文化源远流长,其中不少优秀的文化著作,可作为青少年人格教育的读本。

2.下列句子,没有语病的一句是()A.北京2022年冬奥会的冰雪比赛项目,有滑雪、冰球等7个大项109个小项组成。

B.随着返回舱4月16日成功着陆,意味着神舟十三号载人飞行任务取得圆满成功。

C.射洪侏罗纪世界公园推出线上游览活动,让无法亲临现场的人也能“走进”公园。

D.劳动课能够让学生感受到劳动的快乐,有利于提升他们的劳动技能和劳动习惯。

3.下列句子中,没有语病的一项是()A.作为世界上最大的发展中国家,中国克服自身经济、社会等方面困难,实施一系列应对气候变化行动、战略和措施,参与全球气候治理,应对气候变化取得了积极成功。

B.在日常课堂教学中培养学生的创新思维、大胆质疑精神与实践能力,是当前课堂教学改革成败的关键。

C.低碳生活就是指在不影响生活质量的前提下,尽量减少生活和工作中耗用的能量,从而减低碳的排放量,达到减缓大气污染、减少生态恶化的目的。

D.去湖南省博物馆看看吧,那里不仅有湘绣、陶瓷等展品,更有著名的马王堆汉墓展品,定能让你收获满满。

4.下列语句中有语病的一项是()A.通过观看电影《长津湖》,使我的心灵受到了强烈的震越。

B.中国人民缅怀、讴歌浴血奋战的抗战英烈,能够提高年轻人对英雄所做贡献的认知,传承英雄身上展现的伟大精神。

C.对父亲来说,台阶既是他的物质期待,也是他的精神追求。

D.据调查,青少年近视的原因主要是户外运动时间偏少及不科学使用电子产品。

5.下面一段话中有语病...的一句是()①中国发展离不开世界,世界发展也需要中国。

2019中考数学限时训练:课时6分式方程的解法及应用(有答案)

2019中考数学限时训练:课时6分式方程的解法及应用(有答案)

课时6分式方程的解法及应用(时间:30分钟满分:32分)评分标准:选择填空每题3分.基础过关1 21•将分式方程x=三去分母后得到的整式方程是()A . x- 2 = 2x 2B . x —2x= 2xC. x —2 = x D . x= 2x—42 32 .分式方程---- ;=-的解为()x—3 xA . x= 0 C. x = 5B . x= 3D . x= 92 33.关于x的分式方程2+二T0的解为x=4,则常数a的值为(A . 1C . 41 44 . (2018广州)方程-=一的解是x x+ 6 B . 2 D.105 . (2018嘉兴)甲、乙两个机器人检测零件,甲比乙每小时多检测20个,甲检测300个比乙检测200个所用的时间少10%.若设甲每小时检测x个,则根据题意,可列出方程:_______________________6 . (6分)解分式方程:(1)2= 1; (2) 2x+ 5= 3.7 . (8分)(2018玉林)山地自行车越来越受中学生的喜爱.一网店经营的一个型号山地自行车,今年一月份销售额为30 000元,二月份每辆车售价比一月份每辆车售价降价100元,若销售的数量与上一月销售的数量相同,则销售额是27 000元.(1)求二月份每辆车售价是多少元?(2)为了促销,三月份每辆车售价比二月份每辆车售价降低了10%销售,网店仍可获利35%,求每辆山地自行车的进价是多少元?拓展提升x kk的取值范围为1. (2018眉山)已知关于x的分式方程 =—2== 有一个正数解,则X 3 X 3参考答案:基础过关 1.A 2.D 3.D 4.x = 2 5.300^^^ X (1 —10%) xx — 206.解:(1)去分母,得2x — 4= x ,解得x = 4.检验:当x = 4时,x 丰0, x — 2丰0.x = 4是分式方程的解.1(2)去分母,得 2x — 5 = 3(2x — 1),解得 x = — ^.1检验:当x =— 1时,2x — 1 = — 2工0.1••• x =—2是分式方程的解.7.解:(1)设二月份每辆车售价为 x 元,则一月份每辆车售价为 解得x = 900.经检验,x = 900是原分式方程的解.答:二月份每辆车售价是 900元.(2)设每辆山地自行车的进价为 y 元.根据题意,得 900X (1— 10%) — y = 35%y , 解得y = 600. 答:每辆山地自行车的进价是 600元.拓展提升 1.k v 6且k z 3 根据题意,得 30 000 x + 100 27 000(x + 100)元.。

高三英语晚自习限时训练 (1)

高三英语晚自习限时训练 (1)

高三英语限时训练一、阅读理解A7-Day Tour from London to EdinburghA London guide will show you the city’s famous landmarks like Buckingham Palace, Downing Street and Westminster Abbey. Then, in Edinburgh, you’ll tour the castle and see Scotland’s Crown Jewels. From the historical sights to the beautiful scenery, this guided tour of England and Scotland is a great way to experience everything Britain has to offer.Starting at: $849 per person9-Day Tour from Dublin to LondonYour guided tour of Ireland and Britain begins in the capital cityof Dublin. Enjoy seeing the “Fair City”, including the statue-lined O’Connell Street, Trinity College, and St. Patrick’s Cathedral. Your local guide will show you the famous sights, including the Houses of Parliament, Big Ben, Westminster Abbey and Buckingham Palace. This guided tour of Ireland and Britain is a welcome escape with fewer crowds and lower costs than high-season tours.Starting at: $1069 per person7-Day Tour from London to ParisYour guided vacation in London begins with a welcome dinner and a cruise on the Thames River to admire the Tower Bridge and the Houses of Parliament. You’ll spend three nights in London to see the sites ofthis historic city—from Big Ben to Buckingham Palace, and also St. Paul’s Cathedral. Then you’ll enjoy a 3-night stay in Paris. This includes sightseeing at the Arc de Triomphe, Concorde Square, Champs-Elysees, and a Seine cruise. This guided tour of London and Paris is certain to be enjoyable with fewer crowds in the off-season!Starting at: $1149 per person1. How much would a couple pay for the 7-day tour from London to Edinburgh?A.$849. B.$1149. C.$1698. D.$2138.2. Which place can you visit if you take the 9-day tour from Dublin to London?A.Downing Street. B.Trinity College. C.The Thames River. D.Concorde Square.3. What do the three tours have in common?A.They are all guided tours for visitors.B.People will spend the same amount of time.C.They all begin in the capital city of London.D.People can enjoy the same number of sights.BRace walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rulesrequire that a race walker’s knees stay straight through most of theleg swing and one foot remain in contact (接触) with the ground at all times. It’s this strange form that makes race walking such anattractive activity, however, says Jaclyn Norberg, an assistantprofessor of exercise science at Salem State University in Salem, Mass.Like running, race walking is physically demanding, she says, According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon amo ng race walkers. But thesport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to becautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.4. Why are race walkers conditioned athletes?A.They must run long distances.B.They are qualified for the marathon.C.They have to follow special rules.D.They are good at swinging their legs.5. What advantage does race walking have over running?A.It’s more popular at the Olympics.B.It’s less challenging physically.C.It’s more effective in body building.D.It’s less likely to cause knee injuries.6. What is Dr. Norberg’s suggestion for someone trying race walking? A.Getting experts’ opinions.B.Having a medical checkup.C.Hiring an experienced coach.D.Doing regular exercises.7. Which word best describes the author’s attitude to race walking? A.Skeptical. B.Objective.C.Tolerant. D.Conservative.CAn unconventional method for growing rice has been found to increase yields(产量) by 20 to 50 percent. Reports from China, India, Southeast Asia and Africa suggest that average yield increases of 20 to 50 percent are regularly being achieved by farmers adopting the "system of rice intensification(集约化)"(SRI),which needs one-tenth as many seeds and aims to stimulate the root system of plants rather than trying to increase yields in the conventional way by using improved seeds and fertilizers.The idea of using less to gain more is seen as an important innovation(革新) for adapting farming to climate change and a way to increase yields at a time when human populations are growing fast but traditional plant breeding and genetically modified techniques have failed to increase yields more than a few percentage points, says Norman Uphoff, professor of international agriculture at Cornell.The new way to grow rice needs only half as much water, and is proving most popular in water-stressed countries, says Tavseef Mairaj Shah, a Ph.D.researcher. "Rice growing in Kashmir largely depends on irrigation systems that draw water from the river Jhelum. But climate change is leading to drier winters, untimely rains, and warmer summers."“SRI is a great technique, not just from the water-savingperspective but because it offers better yields and soil conditions. Different studies, both at the experimental level and farmer-participative level, have shown that SRl improves yields with less water.” Shah adds.Some academic, the global seed industry and the international community once rejected reports of “fantastic” yields, accusingfarmers of falsifying(篡改)records and researchers of carelessness and "non-science". But more than 600 articles, checked by SRI Internationalat Cornell University, have shown benefits.Uphoff says, “Attitudes are changing.The original hostility(敌意)has gone." However, the early opposition has resulted in comparativelylittle scientific research being conducted into SRI and a slow understanding by funders.8. How does SRI increase the yields of rice?A.By sowing more seeds B.By using improved seeds.C.By improving its root system. D.By adopting special fertilizers. 9. Compared with the conventional method for growing rice, SRI.A.needs less water B.increases labor costsC.requires better soil conditions D.depends on genetically modified techniques10. What was the global seed industry's initial attitude toward reportson SRI?A.Curious B.Skeptical. C.Approving D.Uninterested. 11. Which of the following can be the best title of the passage?A.How to Increase YieldsB.People's Attitudes Towards SRIC.An Innovative Means of Growing RiceD.The Disadvantages of Conventional Plant Breeding二、完形填空A Florida man likes to shop at garage sales for old plaques(纪念匾)so he can reuse the wooden backs. Recently, he was looking through a 12 he bought years ago when one 13 a small ball caught hiseye.The man took a moment to 14 what was written on the plaque and quickly realized there was a 15 stone inside the ball-a piece ofmoon rock brought back on the Apollo 17 mission in 1972. The plaque and rock had been a 16 to the state of Louisiana by then-President Richard Nixon but 17 ended up in a garage sale for the man to find years later.“I can’t even tell you how long I 18 i t for. I’m not evensure how much I 19 for it. The wood in the plaques is such nicewood and that is what I 20 them for," the man said. The man 21 t he Louisiana governor’s office, which 22 him to the LouisianaState Museum. The man hand-delivered his 23 to the Louisiana State Museum. He didn’t want to take a chance that something might happen toit during 24 .The museum’s director is 25 for hisgenerosity and 26 for reuniting the state with this priceless object. “It is an extraordinary piece of Louisiana history,” he said. “We’re 27 to take possession of this piece and to share it withour audiences.”After Apollo 17 28 on Earth, Nixon 29 379 pieces of the satellite stone to all the states as well as foreign nations. Over time, those gifts began to 30 A 2002 search found that many were unaccounted for. To date, the fate(命运)of 171 rocks remains 3112. A.painting B.ball C.book D.collection13. A.linking B.featuring C.sharing D.obtaining14. A.read B.stress C.think D.remember15. A.normal B.new C.precious D.similar16. A.gift B.signal C.threat D.change17. A.sometimes B.somehow C.instead D.never18. A.borrowed B.returned C.owned D.lost19. A.paid B.earned C.saved D.charged20. A.carry B.prepare C.push D.buy21. A.passed B.contacted C.recognized D.trusted22. A.attracted B.added C.pointed D.reported23. A.work B.find C.receipt D.letter24. A.delivery B.discovery C.construction D.treatment25. A.eager B.responsible C.famous D.grateful26. A.reason B.demand C.concern D.claim27. A.likely B.free C.embarrassed D.excited28. A.landed B.existed C.wandered D.failed29. A.threw away B.put aside C.turned in D.handed out30. A.improve B.disappear C.drop D.matter31. A.unforgettable B.unacceptable C.unknownD.undoubted三、七选五阅读I love learning foreign languages so much that I learn a new language every two years. When people find I’m a polyglot(通晓多种语言的人),they always ask me,“How do you do that?” Honestly, my answerwill be, “I don’t know. I simply love learning languages.” 32 They want to know why they spend years learning even one language, never achieving fluency, and what’s the secret of being polyglots.33 And what do we have in common? I decided to find that out. I went to several events where language lovers gather to practice their languages, asked dozens of polyglots about methods they use, and heard dozens of approaches. Everybody seems to have a unique way to speak several languages fluently.34 All these polyglots talked about language learning as if it was great fun. They found ways to turn language learning from aboring subject into a pleasant daily activity. You should have seentheir faces when they were showing me their colorful grammar charts and handmade flash cards. 35 The methods are various, but they make sure it’s something enjoyable.I realized it’s actually how I learn. 36 Then interesting programs became my choice. So all is clear. If you don’t like writing words down on paper, type them in an app. If you’re a shy perso n, apply self-talk at home. This is how polyglots learn languages, and the best news is that it’s available to anyone willing to take the learning into their own hands.A.How can those with little talent be fluent?B.But people are never happy with the reply.C.There’s no shortcut to learning languages for anyone.D.One of them even made recipes in a foreign language.E.That made me wonder, too, how other polyglots actually do it. F.When learning Spanish last year, I was bored with textbooks. G.Polyglots simply found ways to enjoy the language-learning process.四、语法填空阅读下面短文, 在空白处填人1个适当的单词或括号内单词的正确形式.May 21st this year marks the first International Tea Day, which37 (name) by the United Nations on November 27th, 2019. To celebrate38 festival, a number of events took place at the ChineseBusinessman Museum in Beijing on Thursday.The chairman of the China Culture Promotion Society addressed the opening ceremony.“As a main promoter of the International Tea Day,the birthplace of tea and the 39 (large) tea-producing country, China has a 40 (responsible) to work with other countries to promote the healthy development of the tea industry. It can help tobuild a community with a shared future 41 mankind,” he said.Th e “First International Tea Day Tea Road Cooperative Initiative” issued (发布) at the ceremony calls for people working in the teaindustry to come together to promote (促进) international cooperation 42 cultural exchanges. A four-year tea promotion-Tea RoadCooperative Plan-was also issued in accordance with the initiative.___42___ (strengthen) the connection with young people, the event included a number of public promotional activities on social media,___43___( invite ) twenty-nine tea professionals from around the worldto have thirty-six hours of uninterrupted live broadcasts.The Chinese Ancient Tea Museum was 43 (official) unveiled(揭幕) at the ceremony, opening 44 (it) first exhibition: The Avenue of Truth - A Special Exhibition o f Pu’er Tea.五、应用文写作47. 假定你是李华,你校将举办以“English Literature Reading”为主题的英语原阅读活动,请你用英语为本次活动写一则宣传稿,内容包括:(1)活动目的;(2)活动安排;(3)发出号召。

2025高中物理一轮复习学案 第2讲 光的干涉、衍射、光的偏振和激光

2025高中物理一轮复习学案  第2讲 光的干涉、衍射、光的偏振和激光
(2)若光程差Δr 是半波长的奇数倍,即Δr=(2n+1)2λ(n=0,1,2,3,…), P 点将出现暗条纹。
(3)屏上到双缝 S1、S2 距离相等的点即为加强点,故双缝干涉中央条纹 为亮条纹。
考点一 考点二 考点三 限时训练
2.薄膜干涉 (1)如图所示,竖直的肥皂薄膜,由于重力的作用,形成上薄下厚的 楔形。
考点一 考点二 考点三 限时训练
例 1 如图所示,在双缝干涉实验中,S1和S2为双缝,P是光屏上的 一点,已知P点与S1和S2距离之差为2.1×10-6 m,今分别用A、B两种单色 光在空气中做双缝干涉实验,问P点是亮条纹还是暗条纹?
考点一 考点二 考点三 限时训练
(1)已知A光在折射率为n=1.5的介质中波长为4×10-7 m; (2)已知B光在某种介质中波长为3.15×10-7 m,当B光从这种介质射 向空气时,临界角为37°(sin 37°=0.6,cos 37°=0.8); (3)若用A光照射时,把其中一条缝遮住,试分析光屏上能观察到的现 象。
考点一 考点二 考点三 限时训练
关键能力
1.双缝干涉明、暗条纹的确定 双缝干涉实验中,光屏上某点到相干光源S1、S2的路程之差为光程 差,记为Δr。如图所示。


考点一 考点二 考点三 限时训练
(1)若光程差Δr 是波长 λ 的整倍数,即Δr=nλ(n=0,1,2,3,…), P 点将出现亮条纹。
过了,这种现象叫作偏振。 (2) 自 然 光 : 通 常 光 源 发 出 的 光 ( 包 括 太 阳 光 ) 是 由 大 量 的 、
___□1_6_振__动__方__向____不同的__□1_7_线__偏__振__光_____组成,称为自然光。 (3)线偏振光:光___□_18_振__动__的__方__向_____限在一个平面内的光。

人教版高中英语选择性必修四复习UNIT--1

人教版高中英语选择性必修四复习UNIT--1

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晨背素材 默写本8分钟检测练 关键能力 核心素养 限时规范训练
续写金句背诵 1.When I woke up,the trees were already bathed in the morning sun. 当我醒来时,那些树已经沐浴在清晨的阳光中了。 2.The pale light of the moon pierced the clouds and shone on the streets. 苍白的月光透过云层照在街道上。 3.In the night sky,the stars winked their eyes as if whispering to us. 夜空里,星星眨着眼睛,仿佛在对我们低语。 4.It was dark,but a giant moon shone so brightly on the streets that you could see the surroundings clearly. 天黑了,一轮巨大的月亮明亮地照耀着街道,周围的景物可以看得一清二 楚。
Germany invaded Poland. (2)All the residents declared _f_o_r garbage-sorting in new efforts to better
protect the environment. (3) 当 老 师 宣 布 我 是 这 次 英 语 演 讲 比 赛 的 获 胜 者 时 , 我 又 惊 又 喜 。
their mind to fix the gap and went back to their sweet and happy brother-sister life.(2024·河北省唐山市模拟)
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晨背素材 默写本8分钟检测练 关键能力 核心素养 限时规范训练
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限时训练3 PART TWO LANGUAGE KNOWLEDGE SECTION A (15’) 21. Sustainable development is long-term ______which focuses on the environment and _____ natural resources. A. plan; preserve B. plan; preserving C. planning; preserving D. planning ;preserve 22. A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it,s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red. A. Though terrible B. Whenever good C. If worse D. When bad 23. Playing QQ’s “Happy Farm” by planting, watering, fertilizing, spraying, harvesting and selling of virtual vegetables, fruits and flowers, we can find out _____ all the excitement is about. A. that B. if C. what D. when 24. __________the burglar from the second floor when the house owner found him stealing last night. A. Down jumping B. Down jumped C. Jumping down D. Jumped down 25. As a young man , he’d rather have a room of his own, however small it is, than __ a room with someone else. A. to share B. to have shared C. share D. sharing 26. .--- An explosion at a coal mine killed at least 62 workers and left another 13 missing. --- Yes, _________ news came as ________ shock to us all. A. the; the B. /; / C. /; a D. the; a 27.If any employee is found _______information regarding applicants and staff, he or she will be fired immediately. A. having leaked B. leaked C. leaking D. to be leaking 28. There is a real possibility that these animals could be frightened, ______ a sudden loud noise. A. being there B. there having been C. there was D. should there be 29. The door burst open and______, shouting with anger. A .rushed in a crowd B. in a crowd rushed C. a crowd in rushed D.i n rushed a crowd 30. It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind, _______? A. was it B. wasn’t it C. did they D. didn’t they 31. Jackie,you _______hang all your clothes in the room like this! A. wouldn’t B. needn’t C. mustn’t D. oughtn’t 32. Many crimes are committed by some bad people, an example of which is fraud, a crime ______money is stolen by cheating others. A. which B. that C. whose D. where 33. Do you expect to be a possibility that we shall be able to afford the particular furniture we need? A. it B. there C. that D. one 34. was to blame. A. The parents as well as their child B. Not the parents but their child C. Neither the child nor his parents D. Both the parents and their child 35. —Are you glad that you came to Changsha? —Yes,indeed. I going to Shanghai or Shenzhen, but I have never regretted my decision. A. have considered B. am considering C. had considered D. was considering SECTION B (18’) Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more anxious, waiting for the final school bell. Upon its 36 everyone would run for their coats and go home, everyone except David David was a small boy in ragged clothes. I had often wondered what kind of home life David had, and what kind of mother could send her son to school dressed so 37 for the cold winter months, without a coat, boots, or gloves. But something made David 38 . I can still remember he was always 39 a smile and willing to help. He always stayed after school to straighten chairs and mop the floor. We never talked much. He 40 just simply smile and ask what else he could do, then thank me for letting him stay and slowly head for home Weeks passed and the 41 over the coming Christmas grew into restlessness until the last day of school before the holiday break. I smiled in 42 as the last of them hurried out of the door. Turning around I saw David quietly standing by my desk. “I have something for you.” he said and 43 from behind his back a small box. 44 it to me, he said anxiously, “Open it.” I took the box from him, thanked him and slowly unwrapped it. I lifted the lid and to my surprise saw nothing. I looked at David‘s smiling face and back into the box and said, “The box is nice, David, but it’s 45 .” “Oh no it isn’t” said David. “It’s full of love. My mum told me before she died that love was something you couldn’t see or touch unless you know it’s there.” Tears filled my eyes 46 I looked at the proud dirty face that I had rarely given attention to. After that Christmas, David and I became good friends and I never forgot the meaning 47 the little empty box set on my desk. 36. A. warning B. ringing C. calling D. yelling 37. A. modestly B. naturally C. inaccurately D. inappropriately 38. A. popular B. upset C. special D. funny 39. A. expressing B. delivering C. wearing D. sharing 40. A. would B. should C. might D. could 41. A. argument B. excitement C. movement D. judgment 42. A. relief B. return C. vain D. control 43. A. searched B. found C. raised D. pulled 44. A. Holding B. Handing C. Sending D. Leaving 45. A. cheap B. empty C. useless D. improper 46. A. as B. until C. because D. though 47. A. from B. behind C. over D. towards SECTION C (12’) Every year, thousands of people come to Edinburgh, the capital city of Scotland, to be part of the Edinburgh Festival. For three weeks every August and September the city is filled with actors and artists from 48 over the world. They come to Edinburgh 49 the biggest arts festival in Britain. During this time the streets of the city are alive with music and dance from 50 morning till late at night. You can even see artists painting pictures on the streets. One of the best parts of the Festival is the “Fringe”, 51 students do comedy shows in small halls and cafés. 52 of thousands of tourists come to the Festival to see new films and plays and hear music performed by famous musicians. This year, you can see over five hundred performances 53

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