2020-2021广东开平市第一月考试卷及答案分析

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广东省江门市开平开桥中学2021年高二数学文月考试卷含解析

广东省江门市开平开桥中学2020-2021学年高二数学文月考试卷含解析一、选择题：本大题共10小题，每小题5分，共50分。

在每小题给出的四个选项中，只有是一个符合题目要求的1. 曲线y=x3﹣2x+4在点（1，3）处的切线的倾斜角为（）B2. 已知S，T是两个非空集合，定义集合，则结果是( )A. TB. SC.D.参考答案：C【分析】根据定义集合分析元素特征即可得解.【详解】因为表示元素在中但不属于，那么表示元素在中且在中即，故选C.【点睛】本题考查了集合的运算，结合题中给出的运算规则即可进行运算,属于基础题,3. 10个篮球队中有2个强队,先任意将这10个队平均分成两组进行比赛,则2个强队不分在同一组的概率是（）A． B． C．D．参考答案：B4. 实数a=0.2，b=log0.2，c=的大小关系正确的是（）A．a＜c＜b B．a＜b＜c C．b＜a＜c D．b＜c＜a参考答案：C【考点】4N：对数函数的图象与性质；49：指数函数的图象与性质；71：不等关系与不等式．【分析】根据指数函数，对数函数和幂函数的性质分别判断a，b，c的大小，即可判断．【解答】解：根据指数函数和对数函数的性质，知log0.2＜0，0＜0.2＜1，，即0＜a＜1，b＜0，c＞1，∴b＜a ＜c．故选：C ．5. 点到直线的距离的最大值是（）A. B.C. D.参考答案：B6. 空间直角坐标系中，点A(-3，4，0)与点B(2，-1，6)之间的距离为(A) (B) (C) (D)9参考答案：C7. 已知函数，函数，若存在，使得成立，则实数的取值范围是A．B．C．D．参考答案：D略8. 已知椭圆的标准方程为，为椭圆的左右焦点，O为原点，P是椭圆在第一象限的点，则的取值范围（）A. B. C. (0,1) D.参考答案：C设,则,则,因为所以,,,故选C.9. 函数f（x）的定义域为R，f（-1）=2，对任意，f’（x）＞2，则f(x)＞2x+4的解集为（）A. (-1,1)B. (-1，+∞)C. (-∞,-1)D. (-∞,+ ∞)参考答案：B试题分析：依题意可设，所以.所以函数在R上单调递增又因为.所以要使，只需要.故选B.考点：1.函数的求导.2.函数的单调性.3构建新的函数的思想.10. 在正方体中，若是的中点，则直线垂直于（）A． B． C． D．参考答案：B 解析：垂直于在平面上的射影二、填空题:本大题共7小题,每小题4分,共28分11. 经过点，且与直线平行的直线方程是▲．参考答案：12. 已知直线的充要条件是= .参考答案：13. 若二项式的展开式的第三项是常数项，则=_______.参考答案：6；略14. 设x，y满足约束条件则z＝2x－y的最大值为.参考答案：815. 是虚数单位，.（用的形式表示，）参考答案：略16. 等比数列{a n}的前n项和为S n，若3S1，2S2，S3成等差数列，则等比数列{a n}的公比为．参考答案：3【考点】89：等比数列的前n项和．【分析】由3S1，2S2，S3成等差数列得，4S2=3S1+S3，利用等比数列的通项公式代入即可得出．【解答】解：由3S1，2S2，S3成等差数列得，4S2=3S1+S3，∴，解得q=3．故答案为：3．17. 一个单位共有职工200人，其中不超过45岁的有120人，超过45岁的有80人．为了调查职工的健康状况，用分层抽样的方法从全体职工中抽取一个容量为25的样本，应抽取超过45岁的职工人．参考答案：10略三、解答题：本大题共5小题，共72分。

2021年开平市第一中学高三英语月考试卷及答案解析

2021年开平市第一中学高三英语月考试卷及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AAlex Palmer says he'll never forget his 13th birthday, not because of a gift or a party, but fire. “It made me realize how valuable life is,” said Alex, a seventh grader atMonroeDemonstrationSchoolinTulsa,Oklahoma.On April 18, Alex and many other kids from his school were riding home on a school bus when they suddenly saw smoke coming from the bus’ engine. “It was jaw-dropping,” he told reporters.By the time Alex and some other kids made it out the bus’ back door, the bus was already on fire. And some of their schoolmates were still inside. So he and some of the other older kids took action.“One little kid was slowing everyone down with his big backpack, ” eighth grader Destiny Fain said, “so I got it off and threw it to the side and helped to make sure all the little kids weren’t fighting or pushing. ”As that was going on, sixth grader Marketez Doyle-Smith reportedly helped another classmate who had trouble in breathing because of the smoke. “We saw our friend lying on the ground,” he said, “so we took our shirts off and waved them to get him some air to breathe.”Marketez also reportedly stopped a younger kid trying to get back on the bus to search for something he’d left behind. “We're all a family,” he told reporters. “So I went back to help the little kid.”Finally everyone made it off safely, thanks to Alex, Destiny, Marketez and several other kids. By later that day, they were already being called heroes. “I really don’t see it as being a hero,” Alex said, according to The World. “I see it as the right thing to do—helping others before you help yourself.”1. What happened on Alex’ s way home?A. The school bus was on fire suddenly.B. There was a party for Alex’s birthday.C. He received a gift from his classmate.D. Some classmates quarreled with each other.2. By saying "We're all a family.” Marketez probably meantA. We’re brothers in the same family.B. It’s our duty to help each other.C. We’re classmates in the same class.D. The thing left on the bus is mine.3. According to the last paragraph, Alex thought that heA. was not a brave student.B. had the right to do anything.C. had just done what he should do.D. hated to be called a hero by others.BA team of engineers atHarvardUniversity in trying to create the first robotic fly. Designed to do what a fly does naturally, the tiny is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks."The added difficulty with a project like this is that actually none of its components is off the shelf and so we have to develop them all on our own’ said Robert Wood, a Harvard engineering professor.They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings hasa number of interdependencies (相互依赖）on the individual components, each of which individually has to perform well, but then has to be matched well to everything it d connected to,” said Wood.While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites，in farmers’ fields or on the battlefield. "Basically it should be able to take off, land and fly around，” he said.Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications.“You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animal，but using these robots instead” he said. "So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day-to-day basis.”4. What is the typical characteristic of the robotic fly?A. It's automatic.B.It's very small.C. It's controllable.D. It's quite powerful.5. We can infer from the passage that the robotic flyer can____ .A. act as a spy planeB. help do farm workC.fly at a very high speedD. answer many scientific questions6. What is Wood's idea about the robotic fly according to the last paragraph?A. It is highly questionable.B. It has wide practical applications.C. It gives scientists interest in flying machines.D. It points to a new direction in studying biology.7. What can be the best title for the passage?A. Harvand's Study in the Field of Insects.B. A Breakthrough in Engineering ScienceC. An Interesting Invention一Robotic FlyD. Robotic Fly一a Copy of Real Life InsectCMy family and I never talked about school as the ticket to a future. I was in theclassroom, but I wasn't there to learn to write, read or even speak. When it was my turn to read, I wanted to hide. I was 13 years old, but I already hated being who I was.I had an English teacher, Mr.Creech, who knew I couldn't read. In one of my first lessons the teacher said that anyone who had a reading age below six had to stand up. I felt so embarrassed. But at the same time, it made me realize that I needed to change the situation. I was determined it wouldn't happen again. Later that day, Mr.Creech encouraged me and promised he would try his best to help me learn to read. From then on, I never gave up practicing reading.Then when I was 41 years old, one day, I planned to fly back toTexasto visit my friends and family. On my way from the airport, I saw Mr.Creech buying himself a drink. I rushed over and reached into my pocket to pay for him. “Do I know you？” he asked. “Yes, sir, you do know me，” I answered excitedly. “My name is Anthony Hamilton. You taught me English.” The look on his face told me that he remembered the boy he'd once encouraged.“I'm so glad I had a chance to see you，” I said. “And Mr.Creech, I have great news to share.” I told him I had learned to read. But that wasn't all. I had become a published author and an active speaker. “The next time you get another Anthony Hamilton in your classroom, please encourage him to read as well，” I added.The experts say what once worried me has a name：dyslexia(诵读困难). But I can tell you it was a lack of desire for education.8. Why did the author want to hide?A. Because he felt sorry for himself.B. Because he hated being laughed at.C. Because he couldn't read at all.D. Because he didn't have a ticket.9. Which of the following could best describe Mr.Creech?A. Considerate and dutiful.B. thoughtful and enthusiastic.C. Emotional and devoted.D. Friendly and wise.10. Why couldn't the author read before meeting Mr.Creech?A. Because his reading age was not long enough.B. Because his parents didn't teach him how to read.C. Because he was afraid of reading before the class.D. Because he didn't have inner driving force to learn to read.11. What can we infer from the passage?A. Mr.Creech taught two students called Anthony Hamilton.B. The author had become a published author and an active speaker.C. Dyslexia was just the reason that made the author unable to read.D. The author was grateful to Mr.Creech.DA crew（全体成员）of six teenage girls completed a nine-day sailing trip in the US recently, after having seasickness and strong winds.For the past three years, the Sea Cadet teenagers whoset sail were all male. Roger Noakes, who captained（担任队长）the boat, said this was the first time he’d taken out an all-female crew.The girls asked for an all-girls trip in August this year. The crew set sail along with three adults, Noakes and two Sea Cadet representatives. The original plan was for the girls to sail 24 hours a day in rotating shifts（轮流换班）along the coast and then return. Things turned out differently, however. “The first night was difficult because the wind was really hard. The waves were going up and down,” said Abby Fairchild,16. “Everybody got seasick.” Noakes gave the girls the choice of just sailing in the bay and not going into open water. “But they decided they were going.”The teenagers then sailed a long way overnight and slept in shifts. “We’ve learned everything from controlling the boat to putting up the sails while we have rough seas,” said 15-year-old Olivia Wilcox.The teenagers stopped on land in Massachusetts. They didn’t make it to their original destination（目的地）in Maine, where they were supposed to have a celebratory dinner, due to the weather and winds. They said they weren’t disappointed, however, as they’d learned a lot. “They learned about boating, and above all, they built confidence and character,” said Noakes.12. What was special about the Sea Cadet trip this year?A. It was the longest sailing trip ever.B. It was the first all-female-crew sailing trip.C. It was the most dangerous sailing trip ever.D. It was the first sailing trip for teenagers.13. What happened on the crew’s first day of the trip?A. They all felt sick on the boat.B. Some of them were hurt.C. Their boat was out of control.D. They went into open water by mistake.14. Which of the following best describes these young sailors?A. Strong-minded and having a strong sense of teamwork.B. Hard-working and having great leadership skills.C. Understanding and creative.D. Adventurous and skillful.15. According to Noakes, what was the sailors’ greatest benefit from the trip?A. They knew the sea better.B. They made many friends.C. They got excellent sailing skills.D. They developed good personalities.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

广东省开平市忠源纪念中学2020-2021学年高一下学期第一次月考物理试题

广东省开平市忠源纪念中学2020-2021学年高一下学期第一次月考物理试题学校:___________姓名：___________班级：___________考号：___________一、单选题1．下列说法中正确的是：（）A．万有引力常数最先由牛顿测出B．万有引力常数由最先卡文迪许测出C．万有引力定律最先由卡文迪许提出D．万有引力定律只适用于天体之间的作用力2．在不考虑空气阻力的情况下，下列物体中做平抛运动的是A．竖直下落的篮球B．水平击出的排球C．斜向上踢出的足球D．从桌面上弹起的乒乓球3．一辆卡车在丘陵地匀速率行驶，地形如图所示，由于轮胎太旧，途中爆胎可能性最大的地段应是（）A．a处B．b处C．c处D．d处4．设地球表面的重力加速度为0g，物体在距离地心4R（R是地球半径）处，由于地/g g为（）球的作用产生的加速度为g，则0A．1 B．1/2C．1/4 D．1/165．已知下面的哪组数据可以计算出地球的质量．引力常量G已知（）A．月球绕地球运动的周期和月球到地球中心的距离B．地球同步卫星离地面的高度C．地球绕太阳运动的周期和地球到太阳中心的距离D．人造卫星在地面附近的周期6．小船渡河过程中，船身保持与河岸垂直的情况下，船运动到河中央时，水流速度突然增大，与河水保持正常流速相比较，下列物理量中仍将保持不变的是（）A．小船到达对岸的时间B．小船的速度方向C．小船的速度大小D．小船到达对岸所发生的位移二、多选题7．关于平抛运动，下面说法正确的是A．由于物体只受重力作用，因此平抛运动是匀变速运动B．由于速度的方向不断变化，因此平抛运动不是匀变速运动C．平抛运动的时间由抛出时的高度和初速度的大小共同决定D．平抛运动的水平位移由抛出时的高度和初速度的大小共同决定8．关于匀速圆周运动的下述说法中正确的是（）A．周期不变B．线速度不变C．角速度不变D．向心加速度不变9．如所示为一皮带传动装置，右轮的半径为r，a是它边缘上的一点；左侧是一轮轴，大轮半径为4r，小轮半径为2r，b点在小轮上，到小轮中心距离为r，c点和d点分别位于小轮和大轮的边缘上．若在传动过程中，皮带不打滑，则 ( )A．a点与b点线速度大小相等B．a点与c点角速度大小相等C．a点与d点向心加速度大小相等D．a、b、c、d四点中，加速度最小的是b点10．小球m用长为L的悬线固定在O点，在O点正下方L/2处有一个光滑钉子C，如图所示，今把小球拉到悬线成水平后无初速度地释放，当悬线成竖直状态且与钉子相碰时A．小球的速度突然增大B．小球的角速度突然增大C．小球的向心加速度突然增大D．悬线的拉力突然增大三、实验题11．在做“研究平抛物体的运动”的实验中，为了确定小球在不同时刻所通过的位置，实验时用如图实所示的装置，在一块平木板表面钉上复写纸和白纸，并将该木板竖直立于紧靠槽口处．使小球从斜槽上紧靠挡板处由静止释放，小球撞到木板并在白纸上留下痕迹A；将木板向远离槽口方向平移距离x，再使小球从斜槽上紧靠挡板处由静止释放，小球撞在木板上得到痕迹B；又将木板再向远离槽口方向平移距离x，小球再从斜槽上紧靠挡板处由静止释放，再得到痕迹C.若测得木板每次移动距离均为x＝10.00 cm.A、B 间距离y1＝4.78 cm，B、C间距离y2＝14.58 cm.(g取9.80 m/s2)（1）实验前，需要将斜槽轨道的末端调至_______（填“水平”或“倾斜”）；（2）为了得到图中的A、B、C三点，每次释放小球时的初位置应该______（填“相同”或“不同”）（3）小球从A下落到B，与从B下落到C所用时间_____（填“相等”或“不等”）；（4）小球在平抛运动过程中，竖直方向做的是__________运动；水平方向做的是___________运动．（5）根据以上直接测量的物理量求得小球初速度为v0＝________ m/s（结果保留两位有效数字）．四、解答题12．在5m 高处以10m / s 的速度水平抛出一小球，不计空气阻力，g 取10 m / s2，求：(1)小球在空中运动的时间；(2)小球落地时的水平位移大小；(3)小球落地时的速度大小。

广东省江门市开平风采中学2020-2021学年高一化学月考试题含解析

广东省江门市开平风采中学2020-2021学年高一化学月考试题含解析一、单选题（本大题共15个小题，每小题4分。

在每小题给出的四个选项中，只有一项符合题目要求，共60分。

）1. 二苯基甲烷是有机合成的一种中间体，可通过下列反应制备。

下列说法错误的是A. 该反应属于取代反应B. CH2Cl2不存在同分异构体C. 二苯基甲烷分子中所有原子处于同一平面D. 1mol二苯基甲烷最多可与6molH2发生加成参考答案：C2. 下列化合物中既有离子键又有共价键的是（）A．KBr B．NaOH C．HBr D．N2参考答案：B考点：化学键．专题：化学键与晶体结构．分析：先判断物质类型，再判断物质中存在的化学键；一般金属与非金属元素之间形成离子键，非金属与非金属元素之间形成共价键．解答：解：A、KBr是离子化合物，存在的化学键是离子键，故A错误；B、NaOH是离子化合物，钠离子和氢氧根离子之间形成的是离子键，氢氧根离子中氢原子与氧原子之间形成的是共价键，故B正确；C HBr是共价化合物，氢原子与溴原子之间形成的是共价键，故C错误；D 氮气是单质，氮原子和氮原子之间形成的是非极性共价键，故D错误；故选B．点评：注意：1、离子化合物中可能存在共价键，共价化合物中一定不存在离子键；2、稀有气体是单原子分子，不存在共价键，只存在分子间作用力．3. 制取相同质量的C u(N O3)2 ,下列各组反应中，消耗H NO3的量最多的是A．Cu+ HN O3(浓) B．Cu + HNO3(稀)C．CuO + HNO3 D．C u(O H)2 + HNO3参考答案：A4. 下列实验操作中叙述正确的是()A．萃取操作必须在分液漏斗中进行B．振荡试管中液体时，用手腕甩动C用剩的药品应收集起来放回原试剂瓶中D称量物质时先取小砝码，再依次取较大的砝码参考答案：B略5. 下列化学反应中，属于氧化还原反应的是A. Na2CO3＋CaCl2＝CaCO3↓＋2NaClB. Fe+CuSO4＝Cu+FeSO4C. 2NaHCO3Na2CO3+CO2↑+H2OD. CaO＋H2O＝Ca（OH）2参考答案：B略6. 下列有关Cl、N、S、Si等非金属化合物的说法不正确的是（）A、硅胶、浓硫酸、碱石灰、无水氯化钙都是实验室常用的干燥剂，它们都可以用来干燥NH3、Cl2、SO2、H2等气体B、将氯气和石灰乳混合可制漂白粉，其有效成分是氯化钙C、硅是一种良好的半导体材料，可用作做光电池和计算机芯片D、液氨可用作制冷剂参考答案：AB略7. 现有铝和过氧化钠的固体混合物样品，加入稀盐酸使混合物完全溶解，所得溶液中c(Al3＋)∶c(H＋)∶c(Cl－)＝1∶2∶8，则原固体混合物中铝元素与氧元素的质量比为( )A．3∶4 B．9∶32 C．9∶16D．9∶8参考答案：C8. 下列实验不能获得成功的是A．用浓溴水除去苯中混有的苯酚杂质B．淀粉与稀H2S04充分反应后，加入适量新制Cu(OH)2溶液，加热产生红色沉淀C．只用一种试剂鉴别Na2S溶液、NaCl溶液、Na2SiO3溶液、Na2C03溶液 D．用饱和Na2CO3溶液除去乙酸乙酯中混有的乙酸杂质参考答案：AB9. 下列离子在水溶液中，无色且能大量共存的是（）A. Fe3＋、K+、NO3－、Cl－B. Ba2＋、K+、Cl－、OH－C. H+、Mg2＋、HCO3－、SO42-D. Na+、K+、MnO4－、NO3－参考答案：B10. CO2的摩尔质量为A．44g B．44g/mol C．44 D．22.4L/mol参考答案：BCO2的相对分子质量为44，故摩尔质量是44g/mol．故选B。

2020-2021广东开平市二年级上册月考全真试卷(含答案)

级上册月考全真试卷（含答案）考试时间：60分钟满分：100分姓名：班级：考号：一、给下列加点的字选择正确的读音，用“___”标出。

音符（hú fú ）一堆（duī dēi ）炸酱面（zhà zhá ）鼹鼠（yǎn yàn ）黄莺（yīn yīng ）不倒翁（dǎo dào）漂流（piāo piào ）拂堤( dī tí) 魔术师（mó mú ）【考点】【答案】fú duī zháyàn yīng dǎopiāo dīmó【解析】略二、读拼音，写词语。

kuāfù( )xuán liáng( )yú gōng( ) qiújiàn( )【考点】【答案】夸父悬梁愚公求剑【解析】三、下列没有错别字的一组是（）A. 泥宁波纹能够B. 年迈甘蔗京色C. 晶莹皮劳劳动D. 寻觅郊外好像【考点】【答案】D【解析】略四、亲情的歌声最温暖。

（把下列词语补充完整）（____）（____）勃勃（____）狠（____）辣神通（____）（____）（____）耸（____）云（____）思（____）想焦急（____）（____）【考点】【答案】生机心手广大高入日夜万分【解析】略五、读课文片段，回答问题。

“天哪，这么高的山！”青蛙吸了口凉气，____我没有一双像你一样有力的翅膀，也没有四条善跑的长腿，怎么上得去呢？____（1）青蛙“吸了口凉气”是因为_______________，它觉得自己上不去的原因有：①___________ ②________________③_____________（2）把画线的句子换一种说法，但不改变意思。

＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿（3）用“没有……也没有……”说一句话。

2021年广东省江门市开平第五中学高一物理月考试题带解析

2021年广东省江门市开平第五中学高一物理月考试题含解析一、选择题：本题共5小题，每小题3分，共计15分．每小题只有一个选项符合题意1. 如图2所示，质量相同的A、B两小球用长度不同的两轻绳悬于等高的O1、O2点，绳长LA、LB的关系为LA＞LB，将轻绳水平拉直，并将小球A、B由静止开始同时释放，取释放的水平位置为零势能的参考面，则下列说法正确的是（）A．在下落过程中，当两小球到同一水平线L上时具有相同的重力势能B．两小球分别落到最低点的过程中减少的重力势能相等C．A球通过最低点时的重力势能比B球通过最低点时的重力势能大D．A、B两小球只要在相同的高度，它们所具有的重力势能就相等参考答案：AD2. （多选）如图所示，固定坡道倾角为，顶端距光滑水平面的高度为h，一可视为质点的小物块质量为m，从坡道顶端由静止滑下，经过底端O点进入水平面时无机械能损失，为使小物块制动将轻弹簧的一端固定在水平面左侧M处的竖直墙上，弹簧自由伸长时右侧一端恰好位于O点,已知小物块与坡道间的动摩擦因数为，重力加速度为g，则下列说法正确的是( )A．小物块在倾斜轨道上运动时，下滑的加速度比上滑的加速度小B．当小物块压缩弹簧到最短时，物块的重力势能完全转化为弹簧的弹性势能C．小物块返回倾斜轨道时所能达到的最大高度为D.小物块在往返运动的整个过程中损失的机械能为mgh 参考答案：ACD3. 甲沿着半径为R的圆周跑道匀速跑步，乙沿着半径为2R的圆周跑道匀速跑步。

在相同的时间内，甲、乙各自跑了一圈。

他们的角速度和线速度分别为ω1，ω2，v1，v2则下列说法正确的是（）A．ω1>ω2，v1<v2 B．ω1<ω2，v1<v2C．ω1=ω2，v1<v2 D．ω1=ω2，v1=v2参考答案：C4. 某人沿着半径为 R的水平圆周跑道跑了1.75圈时，他的（）A．路程和位移的大小均为3.5πR B．路程和位移的大小均为RC．路程为3.5πR、位移的大小为R D．路程为0.5πR、位移的大小为R参考答案：C5. （单选）在下列事例中，哪个过程符合机械能守恒A．游乐园中的海盗船，在开始阶段，船摆动幅度会逐渐增大B．自行车从斜坡顶端由静止滑下C．物体以一定的速度沿粗糙的固定斜面上滑而达到一定的高度D．在不计空气阻力的情况下，将一小球竖直上抛，小球从抛出点到落回抛出点的运动过程参考答案：DA、游乐园中的海盗船，在开始阶段，船摆动幅度会逐渐增大，说明有外力对船做功，其机械能增大，故A错误；B、自行车从斜坡顶端由静止滑下，阻力对自行车做功，其机械能不守恒，故B错误；C、物体沿粗糙的固定斜面上滑过程，滑动摩擦力做功，其机械能不守恒，故C错误；D、不计空气阻力，小球竖直上抛，只受重力，机械能守恒，故D正确。

开平市水口镇2020-2021学年七年级语文上学期第一次月考试题

2020-2021七年级语文第一学期学段考试试卷说明：满分120分。

考试用时120分钟。

姓名：班别：一、基础〔共24分〕1．依据课文默写古诗文。

〔10分〕⑴东临碣石，以观沧海。

_______ ___，___________。

曹操《观沧海》〔2分〕⑵回乐烽前沙似雪，__________ __。

〔李益《夜上受降城闻笛》〕〔1分〕⑶三军可夺帅也，____________ 。

〔论语〕〔1分)⑷王湾《次北固山下》中描写时序交替的景物，暗示时光流逝，蕴含自然理趣的是：________ ____，____________ 。

〔2分〕⑸默写李白的《闻王昌龄左迁龙标遥有此寄》〔4分〕__________ __ ，____________ 。

____________ ，____________。

2．依据拼音，写出相应的词语。

〔4分〕⑴后来发生了fēn qí〔〕，母亲要走大路，大路平顺。

⑵春天像小姑娘，huāzhīzhāo zhǎn( )的，笑着，走着。

⑶水藻真绿，把终年zhù xù( )的绿色全拿出来了。

⑷我想拆散一家人，分成两路，ɡè dé qísuǒ( )，终不愿意。

3．以下句子中加点词语使用不恰当的一项是 ()〔3分〕A.王教授的演讲十分出色，在场人士听得津津有味。

B．看到小朋友掉进水缸里，司马光毫不犹疑地搬起石头砸缸。

C．他站在台上窃窃自语，向大家介绍自己的新发现。

D.草原的气候变幻莫测，一会儿烈日当空，一会儿大雨倾盆。

4．对病句的修改不正确的一项是( )〔3分〕A．七年级〔5〕班的语文成绩是全校最好的一个班级。

〔删掉“一个班级〞。

〕B．在学习中，我们要及时解决并发现存在的问题。

〔“解决〞和“发现〞调换位置。

〕C．我生长在戏剧之家，豫剧对我一点都不陌生。

〔后半句改为“我对豫剧一点都不陌生〞〕D．各地政府赦免农业税是农民收入逐年增产的原因之一。

〔删掉“之一〞。

2020年广东省江门市开平第七中学高三物理月考试题带解析

2020年广东省江门市开平第七中学高三物理月考试题含解析一、选择题：本题共5小题，每小题3分，共计15分．每小题只有一个选项符合题意1. 某静电场的电场线分布如图所示，图中P、Q两点的电场强度的大小分别为E P和E Q，电势分别为U P和U Q，则A．E P＞E Q，U P＞U QB．E P＞E Q，U P＜U QC．E P＜E Q，U P＞U QD．E P＜E Q，U P＜U Q参考答案：A解析：从图可以看出P点的电场线的密集程度大于Q点的密集程度，故P点的场强大于Q点的场强，因电场线的方向由P指向Q，而沿电场线的方向电势逐渐降低，P点的电势高于Q点的电势，故A项正确。

2. 关于高中物理实验，下列说法中正确的是（）A．利用打点计时器“研究匀变速直线运动规律”的实验中，可以利用纸带打出的点迹间接测得物体的运动速度B．在“验证力的平行四边形定则”实验中，要使力的作用效果相同，只需橡皮条具有相同的伸长量C．在“验证牛顿第二定律”实验中，采用了理想模型的实验方法D．在“验证机械能守恒定律”的实验中，应该先释放重物后接通电源[参考答案：A 3. 物理学是一门以实验为基础的学科，许多物理定律就是在大量实验的基础上总结出来的规律．但有些物理规律或物理关系的建立并不是直接从实验得到的，而是经过了理想化或合理外推．下列选项中属于这种情况的是……………………………………………………（）A．牛顿第一定律 B．牛顿第二定律C．玻意耳定律 D．法拉第电磁感应定律参考答案：A4. 做曲线运动的物体，在运动过程中，一定变化的物理量是：（）A.速率B.速度C.加速度D.合外力参考答案：B3. 如上图所示为杂技“顶杆”表演，一人站在地上，肩上扛一质量为M的竖直竹竿，当竿上一质量为m的人以加速度a加速下滑时，杆对地面上的人的压力大小为（）A．（M+ m）g -ma B．（M+ m）g +ma C．（M+ m）g D．（M－m）g参考答案：A二、填空题：本题共8小题，每小题2分，共计16分6. （1）一定质量的理想气体由状态A经状态B变化到状态C的p﹣V图象如图所示．在由状态A变化到状态B的过程中，理想气体的温度升高（填“升高”、“降低”或“不变”）．在由状态A变化到状态C的过程中，理想气体吸收的热量等于它对外界做的功（填“大于”、“小于”或“等于”）（2）已知阿伏伽德罗常数为60×1023mol﹣1，在标准状态（压强p0=1atm、温度t0=0℃）下理想气体的摩尔体积都为224L，已知第（1）问中理想气体在状态C时的温度为27℃，求该气体的分子数（计算结果保留两位有效数字）参考答案：分析：（1）根据气体状态方程和已知的变化量去判断温度的变化．对于一定质量的理想气体，内能只与温度有关．根据热力学第一定律判断气体吸热还是放热．（2）由图象可知C 状态压强为p0=1atm ，对于理想气体，由盖吕萨克定律解得标准状态下气体体积，从而求得气体摩尔数，解得气体分子数．解答：解：（1）pV=CT ，C 不变，pV 越大，T 越高．状态在B （2，2）处温度最高．故从A→B 过程温度升高；在A 和C 状态，pV 乘积相等，所以温度相等，则内能相等，根据热力学第一定律△U=Q+W ，由状态A 变化到状态C 的过程中△U=0，则理想气体吸收的热量等于它对外界做的功．故答案为：升高等于（2）解：设理想气体在标准状态下体积为V ，由盖吕萨克定律得：解得：该气体的分子数为：答：气体的分子数为7.3×1022个．（乙）中Oa 、Ob 所示。

2020-2021学年广东省江门市开平港口中学高一数学理月考试题含解析

2020-2021学年广东省江门市开平港口中学高一数学理月考试题含解析一、选择题：本大题共10小题，每小题5分，共50分。

在每小题给出的四个选项中，只有是一个符合题目要求的1. 在等差数列中，，则等于（）A．1 B．2 C．3 D ．4参考答案：C试题分析：因为，所以，故选C．考点：等差数列的性质．2. 已知a n=log（n+1）（n+2）（n∈N*）．我们把使乘积a1?a2?a3?…?a n为整数的数n叫做“优数”，则在区间（1，2004）内的所有优数的和为（）A．1024 B．2003 C．2026 D．2048参考答案：C【考点】对数的运算性质．【分析】根据换底公式，把a n=log（n+1）（n+2）代入a1?a2…a n并且化简，转化为log2（n+2），由log2（n+2）为整数，即n+2=2m，m∈N*，令m=1，2，3，…，10，可求得区间[1，2004]内的所有优数的和．【解答】解：由换底公式：．∴a1?a2?a3?…?a n=log23?log34…log（n+1）（n+2）===log2（n+2），∵log2（n+2）为整数，∴n+2=2m，m∈N*．n分别可取22﹣2，23﹣2，24﹣2，最大值2m﹣2≤2004，m最大可取10，故和为22+23++210﹣18=2026．故选：C．3. 函数f（x）=ax2+2（a﹣1）x+2在区间（﹣∞，4]上为减函数，则a的取值范围为（）A．0＜a≤B．0≤a≤C．0＜a＜D．a＞参考答案：B【考点】函数单调性的性质．【专题】计算题．【分析】根据a取值讨论是否为二次函数，然后根据二次函数的性质建立不等关系，最后将符合条件的求并集．【解答】解：当a=0时，f（x）=﹣2x+2，符合题意当a≠0时，要使函数f（x）=ax2+2（a﹣1）x+2在区间（﹣∞，4]上为减函数∴?0＜a≤综上所述0≤a≤故选B【点评】本题主要考查了已知函数再某区间上的单调性求参数a的范围的问题，以及分类讨论的数学思想，属于基础题．4. 在如图所示的算法流程图中，输出S的值为A、11B、12C、13 D、15参考答案：B5. 若动点分别在直线上移动，则线段AB的中点M到原点的距离的最小值为()A．2 B．3 C．3 D．4参考答案：C6. 函数的一条对称轴方程是（）A． B． C． D．参考答案：A 略7. 已知函数在区间上的最大值为2，则的值等于A．2或3 B．1或3 C．2 D．3参考答案：A，令，则，因为，则,所以，或.8. 函数的零点所在的区间是（）A．（0，1） B．（1，3） C．（3，4）D．（4，+）参考答案：B略9. 要得到函数y=3sin(2x+)图象，只需要将函数y=3cos(2x﹣)的图象（）A．向左平移个单位B．向右平移个单位C．向左平移个单位D．向右平移个单位参考答案：A【考点】三角函数的周期性及其求法．【分析】由条件利用诱导公式，函数y=Asin（ωx+φ）的图象变换规律，得出结论．【解答】解：∵函数y=3sin（2x+）=3cos[﹣（2x+）]=3cos（﹣2x）=3cos（2x﹣）=3cos[2（x﹣）]，=3cos[2（x﹣）]=3cos[2（x﹣﹣）]，∴把函数的图象向左平移个单位，可得函数y=3sin（2x+）的图象．故选：A．10. 水平放置的△ABC的斜二测直观图如图所示，已知A′C′=3，B′C′=2，则AB边上的中线的实际长度为（）A．B．5 C．D．2参考答案：A【考点】斜二测法画直观图．【分析】由已知中直观图中线段的长，可分析出△ABC实际为一个直角边长分别为3，4的直角三角形，进而根据勾股定理求出斜边，结合直角三角形斜边上的中线等于斜边的一半可得答案．【解答】解：∵直观图中A′C′=3，B′C′=2，∴Rt△ABC中，AC=3，BC=4由勾股定理可得AB=5则AB边上的中线的实际长度为故选：A二、填空题:本大题共7小题,每小题4分,共28分11. 在△ABC中，，，则b=_________．参考答案：8.【分析】利用余弦定理构造方程即可解得结果.【详解】由余弦定理得：解得：（舍）或本题正确结果：8 12.的值为▲ .参考答案：13. 给定映射f：（x，y）→（x+2y，2x﹣y），则映射f下的对应元素为（3，1），则它原来的元素为．参考答案：（1，1）【考点】映射．【专题】函数的性质及应用．【分析】本题已知映射f的对应法则和映射的象，可列出参数x、y相应的关系式，解方程组求出原象，得到本题题结论．【解答】解：∵映射f：（x，y）→（x+2y，2x﹣y），映射f下的对应元素为（3，1），∴，∴．∴（3，1）原来的元素为（1，1）．【点评】本题考查的是映射的对应关系，要正确理解概念，本题运算不大，属于容易题．14. 在ΔABC中，有命题：①；②；③若，则ΔABC为等腰三角形；④若ΔABC为直角三角形，则.上述命题正确的是（填序号）．参考答案：②③15. 下列命题：①α内有无数条直线平行于β，则α∥β；②平行于同一直线的两个平面互相平行；③经过平面α外两点一定可以作一个平面与α平行；④平行于同一个平面的两个平面平行．其中不正确的命题为．参考答案：①②③16. 若，使不等式成立，则实数m的取值范围为________.参考答案：(－4,5)【分析】令，将问题转化为二次函数在区间上恒成立问题，即可求得参数范围.【详解】令，由可得，则问题等价于存在，，分离参数可得若满足题意，则只需，令，令，则，容易知，则只需，整理得，解得.故答案为：.【点睛】本题考查由存在性问题求参数值，属中档题.17. 函数的部分图象如图，则. 参考答案：6由图可知，，∴.三、解答题：本大题共5小题，共72分。

2021届开平市金山中学高三英语月考试卷及参考答案

2021届开平市金山中学高三英语月考试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AEast Yorkshire has typical unpredictable British weather. So here are some ideas to keep everybody happy when the weather is not the most ideal.William's Den, North CaveThe outdoor and indoor areas are suitable for children of all ages to have fun.There are nests to explore, rope bridges to cross, a tree-house and a slide. The attached Kitchen provides fresh food made from locally sourced ingredients serving a selection of treats.East Riding Leisure CentresKnown for a fun learner pool alongside an incredible fun zone with two slides as well, it is perfect for kids to find their feet in the water, have fun and explore. Its 6 climbing walls offer a different challenge on each. This place is suitable for anyone over the age of 4 and you can refuel at cafe with fresh food, snacks and cakes.Sewerby Hall and GardensWhen the weather’s not sure, take cover in the Hall and learn how life was in the early 1900’s for the residents and workers of the house. Then explore the zoo and meet the pigs, parrots and penguins! Kids of all ages are welcome.Withernsea LighthouseThere’s no limitation to the age of kids to climb Withernsea Lighthouse, which is 144 steps to the top, with full views of the East Yorkshire Coast at the top of it. Enjoy the museum on the ground floor and learn what life is like working and living in a lighthouse. The souvenir shop provides attractive gifts for visitors at a fair price.1.Which one is unsuitable for kids of all ages?A.William’s Den, North Cave.B.East Riding Leisure Centres.C.Sewerby Hall and Gardens.D.Withernsea Lighthouse.2.Where can kids enjoy food?A.In William’s Den, North Cave and Sewerby Hall and Gardens.B.In East Riding Leisure Centres and Withernsea LighthouseC.In William’s Den, North Cave and East RidingLeisure Centres.D.In Sewerby Hall and Gardens and Withernsea Lighthouse.3.Where does this passage probably come from?A.A geography textbook.B.A science report.C.A finance magazine.D.A travel brochure.BDad’s comb was jade green. I heard he bought it when he married Mum, which made the comb two years older than I was. Every night, he wouldsmile, hand me the comb and say, “Be a good girl and help Daddy clean it, OK?”I was more than happy to do it. At age five this mundane task brought me such joy. I would excitedly turn the tap on, then brush the comb with a used toothbrush as hard as I could. Satisfied that I’d done a good job, I would proudly return the comb to Dad. He would smile at me and place the comb on top of his wallet.About two years later, Dad left his sales job and started his own wholesale business. I started primary school. That was when things started to change. He didn’t come home as much as he used to – just a couple of times a week. And when he did come home, it was always late and I’d already be in bed. I started to get mad. I stopped waiting for him to come home, and stopped going downstairs to check on him.Today, I’m no longer a kid. I’ve graduated from college and got a job. Dad’s business has got back on track. Things are better now. Yet the uncomfortable silence between Dad and me persisted.Two days before my birthday last year, Dad came home early. As usual, I helped him carry his bags into his study. When I turned to leave, he said, “Hey, would you like to help me clean my comb?” I looked at him a while, then took the comb and headed to the sink.I passed the clean comb back to Dad. He looked at it and smiled. But this time, I noticed something different. My dad has aged. He has wrinkles next to his eyes when he smiles, yet his smile is still as heartwarming as before. The smile of a father who just wants a good life for his family. Dad carefully placed his comb on top of his wallet.After so many years, he still organizes his personal items in the same meticulous way. I guess some things never change. And for that, I’m glad.4. What caused the uncomfortable silence between Dad and me?A. Generation gap.B. Dad’s failure in business.C. My ignorance of Dad.D. Dad’s absence from the family.5. Which of the following can best describe Dad?A. Gentle but strict.B. Hardworking and caring.C. Cautious and realistic.D. Demanding but patient.6. Why did Dad ask his daughter to clean his comb before her birthday?A. To give her a lesson.B. To follow his old habit.C. To fix their relationship.D. To praise her helpfulness.7. Which saying concludes the text best?A. Yesterday once more.B. Let bygones be bygones.C. Some things never change.D. Like father, like daughter.CHenry Cavill: Bring Superman to LifeHenry Cavill knew that he wanted to be a star at 16 years of age, after a chance meeting with movie star Russell Crowe who inspired hispassion for acting. But for the British-born actor, the bright lights and attraction ofHollywoodwere a long way away. Supported by his secretary mother and stockbroker father, he decided to study drama during high school. His journey to super star began.Before gaining the international recognition he has now, Cavill tried out for roles in the Harry Potter and Twilight series but failed to get either. He would have to keep waiting for his big chance.Determined as ever, Cavill took any acting jobs he could get his hands on and appeared in several low-budget horror movies and TV shows in hopes of getting noticed. It almost worked. In the early 2000s, at just 22 years old, he narrowly missed out on becoming the new James Bond. Finally, in 2007, his hard work paid off. He won a leading role as the first Duke of Suffolk in the period showThe Tudors. The TV show was very popular and helped to raise Cavill's popularity inAmerica.In 2011, Cavil landed his breakout role, playing Superman in the DC Extended Universe. He hasn't looked back and has since starred in many hit films, such asMission: Impossible- Fallout.More recently, he stepped back on to the small screen. Since 2019, he has starred in the popular seriesThe Witcher, adapted from the book series and video games of the same name. In the TV show, Cavill played a brave monster hunter named Geralt of Rivia, which was the perfect role for Cavill because he was a fan of the video games. Cavill also got a chance to play a classic English character — master detective Sherlock Holmes — in 2020'sEnola Holmes.However, Cavill isn't just a good guy on screen. His charity work also makes him a real-life hero. In 2014, he took part in the Ice Bucket Challenge while wearing his full Superman suit to support the ALS Association. Currently, he is an ambassador for the UK's Royal Marines Charity, which supports war veterans (退伍军人). Whydoes he do it? He love to make people feel good and bring smiles to people' faces. Indeed, Henry Cavill in living proof that you don't always need to wear a cape (斗篷) to act like a hero.8. Why did Cavil act in low-budget film and TV works early in his career?A. He was too polite to refuse.B. He was hoping to get noticed.C. He was encouraged to do so by his parents.D. He was friends with the directors of the projects.9. The role of the monster hunter was the perfect for Cavill because ________ .A. he had experienced hunting monstersB. he had played the same role in a movieC. he knew the writer of the books personallyD. he enjoyed the video games that the show was rooted in10. Which of the following words can best describe Cavill?A. Modest and friendly.B. Determined and kind.C. Talented and faithful.D. Honest and considerate.11. What made Cavill a real-life hero?A. Being a successful actor.B. Playing Superman on screen.C. Devoting to charities.D. Wearing a cape to take part in activities.DTo Rehan Staton, his childhood was a life of privilege — loving parents, a supportive big brother and a pleasant, private school education. Everything changed when his mother left the country and his father lost his job.He had to sleep with a heavy jacket on when it was cold. He was always hungry. He said he couldn't concentrate at school and would sleep during class. He went from straight. As to near the bottom of his class. A teacher told him he needed special education, which made him hate school.Staton spent his high school years as an excellent athlete, raining to become a professional boxer. He had won a lot of martial arts competitions.But a tragedy struck him in his senior year when Staton suffered serious tendonitis (肌腱炎), in both shoulders. He couldn’t lift either arm for months. His dream of becoming aprofessional player failed. He struggled to apply to colleges but was refused byall of them.Staton’s body slowly recovered from martial arts and he got a job as a rubbish collector. Many co-workers couldn't help but ask him a simple question, “What are you doing here? You’re smart. You are too young to be here. Go to college.” It was the first time someone outside his family had spoken highly of his intelligence. It was the co-workers thatem enedhim to return to school.Several co-workers put Staton in touch with a professor atBowieStateUniversity. The professor was impressed with their conversation and persuaded the admissions board to change its former decision.Going to college forced Staton’s older brother, Reggie, to drop out. They both knew someone had to be working full time along with their dad. It was a decision Reggie made on his own.After receiving a 4.0, Staton succeeded in becoming a student at theUniversityofMaryland. But he still had a long way to go to attend Harvard Law eventually...12. What finally changed Rehan Staton’s happy childhood?A. His brother’s losing the job.B. His serious health problem.C. His father’s sudden death.D. His mother’s leaving the country.13. What does the underlined word “em ened” in the fourth paragraph mean?A. Force.B. Direct.C. Encourage.D. Accompany.14. Why did Staton’s elder brother have to drop out of school?A. He wanted his brother to study further.B. His father asked him to leave school.C. He had lost interest in most lessons.D. He had to go out to find his mother.15. What will the writer mainly talk about next?A. What Rehan Staton planned to do after entering Harvard.B. How Rehan Staton managed to be admitted to Harvard.C. Why Rehan Staton decided to choose to go to Harvard.D. When Rehan Staton would be successful in Harvard Law.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

广东省阳江市开平长师中学2020-2021学年高一数学文月考试卷含解析

广东省阳江市开平长师中学2020-2021学年高一数学文月考试卷含解析一、选择题：本大题共10小题，每小题5分，共50分。

在每小题给出的四个选项中，只有是一个符合题目要求的1. 函数的图象的大致形状是 ( )参考答案：D略2. 下列四组函数中，表示同一函数的是（）A．f（x）=lgx2，g（x）=2lgx B．f（x）=?，g（x）=C．f（x）=x﹣2，g（x）=D．f（x）=lgx﹣2，g（x）=lg参考答案：D【考点】判断两个函数是否为同一函数．【分析】根据两个函数的定义域相同，对应关系也相同，即可判断它们是同一函数．【解答】解：对于A，f（x）=lgx2=2lg|x|（x0），与g（x）=2lgx（x＞0）的定义域不同，对应关系也不同，不是同一函数；对于B，f（x）=?=（x≥2），与g（x）=（x≤﹣2或x≥2）的定义域不同，不是同一函数；对于C，f（x）=x﹣2（x∈R），与g（x）==|x﹣2|（x∈R）的对应关系不同，不是同一函数；对于D，f（x）=lgx﹣2（x＞0），与g（x）=lg=lgx﹣2（x＞0）的定义域相同，对应关系也相同，是同一函数．故选：D．3. sin17°sin223°－sin253°cos43°等于（）A、－B、C、－D、参考答案：B4.参考答案：C5. 某初级中学有学生人，其中一年级人，二、三年级各人，现要利用抽样方法取人参加某项调查，考虑选用简单随机抽样、分层抽样和系统抽样三种方案，使用简单随机抽样和分层抽样时，将学生按一、二、三年级依次统一编号为；使用系统抽样时，将学生统一随机编号，并将整个编号依次分为段.如果抽得号码有下列四种情况：①7，34，61，88，115， 142，169，196，223，250；②5，9，100，107，111，121，180，195，200，265；③11，38，65，92，119，146，173，200，227，254；④30，57，84，111，138，165，192，219，246，270；关于上述样本的下列结论中，正确的是（）A．②、③都不能为系统抽样 B．②、④都不能为分层抽样C．①、④都可能为系统抽样 D．①、③都可能为分层抽样参考答案：D6. 设，则之间的大小关系是（）(A) (B)(C) (D)参考答案：C略7. 下列所给4个图象中，与所给3件事吻合最好的顺序为（1）我离开家不久，发现自己把作业本忘在家里了，于是立刻返回家里取了作业本再上学；（2）我骑着车一路以常速行驶，只是在途中遇到一次交通堵塞，耽搁了一些时间；（3）我出发后，心情轻松，缓缓行进，后来为了赶时间开始加速。

广东省江门市开平市三校联考2021-2022学年九年级上学期第一次月考数学试卷

广东省江门市开平市三校联考2021-2022学年度人教版九年级上册第一次月考试卷一、选择题（共10小题）.1.如果关于x的一元二次方程k2x2﹣（2k+1）x+1＝0有两个实数根，那么k的取值范围是（）A. k≥﹣14 B. k≥﹣14且k≠0 C. k＜﹣14 D. k＞－14且k≠02.下列一元二次方程中，有两个不相等的实数根的是（）A. x2−x+14=0B. x2+2x+4=0C. x2−x+2=0D. x2−3x=03.用配方法解方程x2+4x﹣5＝0时，原方程应变形为（）A. （x﹣2）2＝1B. （x﹣4）2＝11C. （x+2）2＝9D. （x+4）2＝214.抛物线y=﹣x2经过平移得到抛物线y=﹣（x+2）2﹣3，平移的方法是（）A. 向左平移2个，再向下平移3个单位B. 向右平移2个，再向下平移3个单位C. 向左平移2个，再向上平移3个单位D. 向右平移2个，再向上平移3个单位5.如图，抛物线y=ax2+bx+c(a≠0)与x轴交于点(4,0)，其对称轴为直线x=1，下列结论错误的是（）A. 抛物线与x轴的另一个交点是(−2,0)B. abc>0C. 当x>0时，y随x的增大而增大D. a+b+c<06.在二次函数y＝－x2＋bx＋c中，函数y与自变量x的部分对应值如下表：( )A. m＞nB. m＜nC. m＝nD. 无法确定7.有一块长方形铁皮，长100cm，宽50cm，在它的四周各剪去一个同样的正方形，然后将四周突出部分折起，就能制作一个无盖方盒.如果要制作的无盖方盒的底面积为3600cm2，设铁皮各角应剪去的正方形边长为xcm，则下面所列方程正确的是（）A. 4x2=3600B. 100×50﹣4x2=3600C. （100﹣x）（50﹣x）=3600D. （100﹣2x）（50﹣2x）=36008.二次函数y=kx2+2x+1(k<0)的图象可能是( )A. B. C. D.9.若实数a，b(a≠b)分别满足方程a2−7a+2=0，b2−7b+2=0，则b a+a b的值为（）A. 452 B.492 C.452或2 D.492或210.二次函数y=ax2+bx+c(a≠0)的图象如图所示，有下列结论：① abc>0，② 4a−2b+c<0，③ a−b≥x(ax+b)，④ 3a+c<0，正确的有（）A. 1个B. 2个C. 3个D. 4个二、填空题（每小题4分，共28分）11.抛物线y=−2(x+1)2−3的顶点坐标为．12.已知方程(x+1)(x+a)=0有一个根是x=3，则a= 。

2021开平市二年级第一月考试题及答案分析

2021开平市二年级第一月考试题及答案分析考试时间：60分钟满分：100分姓名：班级：考号：一、一、选择正确的读音填写在横线上。

踮（diǎn diàn）______株（zhū zū）______ 栽（zāi zhāi）______ 浓（lónɡ nónɡ）______伸（shēn shēnɡ）______ 眨（zǎ zhǎ）______疲（pí qí）______ 倦（jüàn juàn）______【考点】【答案】diǎn；zhū；zāi；nónɡ；shēn；zhǎ；pí；juàn【解析】考查学生对拼音的掌握和辨析。

踮脚，提起脚跟,用脚尖着地；株，量词；栽，种植；浓，浓重；伸，伸出；眨，眨眼；疲，疲倦疲惫；倦，倦怠；二、读拼音，写词语。

bō wén bì lǜ tǔ sī wēn nuǎn（__________）（__________）（__________）（__________）ér tóng wèi dào jǐng sè mào zhe（__________）（__________）（__________）（__________）【考点】【答案】波纹碧绿吐丝温暖儿童味道景色冒着略三、在正确的字上画“√”。

1．蜜蜂在花(从丛)中飞舞。

2．小明(从丛)海边跑来。

3．今天的(风峰)真大。

4．远处的山(风峰)像一只老虎。

【考点】【答案】丛从风峰【解析】题型：判断题题类：难度：较易组卷次数：0四、将下列词语连成句子，并加上标点。

1．雪花空中大片大片从的落下__________________________________________________________ 2．各种各样丰收水果的了__________________________________________________________ 3．两只华佗被的相斗羊分开了__________________________________________________________ 4．开满了山坡上小花五颜六色的__________________________________________________________ 【考点】空中落下大片大片的雪花。

解析广东省开平市忠源纪念中学2020┄2021学年高一下学期第一次月考物理试题 Word版

物理试题一.单选题(本大题共6小题,每小题4分,共24分)1．下列说法中正确的是:( ）Ａ. 万有引力常数最先由牛顿测出B. 万有引力常数由最先卡文迪许测出C. 万有引力定律最先由卡文迪许提出D. 万有引力定律只适用于天体之间的作用力【答案】B2. 在不考虑空气阻力的情况下，下列物体中做平抛运动的是A．竖直下落的篮球B. 水平击出的排球C. 斜向上踢出的足球Ｄ. 从桌面上弹起的乒乓球【答案】B故选B考点：平抛运动点评:水平抛出的物体在只受中力的情况下，物体的轨迹是一条抛物线。

３．一辆卡车在丘陵地匀速行驶,地形如图所示,由于轮胎太旧,途中爆胎，爆胎可能性最大的地段应是（)A. a处B. b处C．c处Ｄ. d处【答案】D【解析】在坡顶由牛顿第二定律得解得,①在坡谷，根据牛顿第二定律有:,解得，②由①②对比可知,汽车在坡谷处所受的支持力更容易爆胎；由②知，r越小，FＮ越大,则在b、ｄ两点比a、c两点容易爆胎，而d点半径比ｂ点小，则ｄ点最容易爆胎,D正确.【点睛】卡车以不率的速率行驶，分别分析经过图中四点时，地面对轮胎作用力与重力的关系,地面对轮胎的作用力最大，容易爆胎，比较地面作用力的大小，即可判断爆胎的可能性最大的位置．4. 设地球表面的重力加速度为，物体在距离地心（是地球半径)处，由于地球的作用产生的加速度为,则为（)A. １Ｂ. 1/2C．１/４ D. 1／16【答案】D【解析】在地球的表面有:，解得:；在距离地心4R处有:，解得：, :，选D.【点睛】根据万有引力等于重力得出重力加速度与距地心距离的关系，从而求出两处的重力加速度之比．5. 已知下面的哪组数据可以计算出地球的质量。

引力常量G已知( ）A. 月球绕地球运动的周期和月球到地球中心的距离B．地球同步卫星离地面的高度C. 地球绕太阳运动的周期和地球到太阳中心的距离Ｄ. 人造卫星在地面附近的周期【答案】Ａ【解析】A、根据万有引力提供向心力,得,已知月球绕地球运动的周期和月球到地球中心的距离,可以计算出中心天体地球的质量，故A正确。

2020-2021学年开平市长师中学高三英语月考试卷及参考答案

2020-2021学年开平市长师中学高三英语月考试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AAre you looking for somewhere special to go this weekend? Do you want to try something new?Check out one of these hot new restaurants.Fast BestFast food doesn't have to be junk food, as this café proves. Do you fancy a really good hamburger made with the best ingredients, or old-fashioned fish and chips fried to perfection, all on the table in super-quick time? Speed and quality are important here, and the prices aren't bad either.Your Local Caff (小餐馆)Remember when cafés served full English breakfasts—sausages, beans, fried bread, bacon and eggs—with a strong cup of tea? Well, this place still does and you can have your breakfast at any time you like during the day while you listen to your favourite tunes from the 1980s.Last Days of the RajA centrally located Indian restaurant, perfect for eating before or after the cinema or a show. In summer enjoy your meal in the beautiful garden. The most popular dishes are lamb and chicken cooked with mild, medium or hot spices. For brave customers there is extra hot!The Chocolate BoxThe owner of this small café used to cook all kinds of food, but then she realised she preferred desserts to anything else. If you want meat or fish, don't come here. They only do desserts! Lots of different kinds of sweets. Chocolate lovers will be excited by the range of chocolate cakes.1.Fast Best suits a person ______.A.who has a sweet toothB.who loves spicy foodC.who wants to have good breakfastD.who gets 30 minutes off for lunch2.Which is true about Last Days of the Raj?A.You can listen to great music in it.B.It serves hot food with pepper.C.It serves an all-day breakfast.D.It is prefect for vegetarians.3.Which restaurant serves only desserts and sweets?A.Fast Best.B.Your Local Caff.st Days of the Raj.D.The Chocolate Box.BA study has found that a lifetime of regular exercise and activity can slow down the aging process (衰老过程). Researchers say that getting older should not necessarily mean becoming more weak or sick. Their research shows that a devotion to a life of movement and exercise may help us live not only longer, but also healthier.For their study, the researchers looked at two groups. The first group was made up of 125 non-professional cyclists between the ages of 55 to 79. This group included 84 healthy men and 41 healthy women. We will call this group the “cyclists”.Researchers then found 130 people to make up a second group. Within this group, 75 people were aged from 57 to 80. The other 55 were between the ages of 20 and 36. The people in this group were also healthy, but they did not exercise regularly. We will call this group the “non-exercisers”. Smokers, heavy drinkers of alcohol and people with other health issues were not included in the study.Then, researchers gave both groups a series of tests. They tested their muscle mass (肌肉质量), muscular strength, percentage of body fat and the strength of their immune (免疫的) systems. Then the researchers compared the results of the two groups.Results showed that the cyclists did not experience body changes usually regarded as a normal aging process. For example, they did not lose muscle mass or muscular strength. Also, their body fat did not increase with age.The researchers also found something they had not expected. The study showed that the immune systems of the cyclists did not age either.The researchers advise us all to find an exercise that we like in our lives.4. How did the researchers carry out the study?A. By comparing.B. By discussing.C. By imagining.D. By reasoning.5. Which of the following is a result of the research?A. The cyclists kept a thin body shape.B. The non-exercisers gained weight easily.C. The cyclists’ muscles remained strong with age.D. The non-exercisers usually had health problems.6. Which is an unexpected result for the researchers?A. The cyclists had normal aging process.B. The cyclists’ immune systems didn’t age.C. The cyclists lost nearly all their fat.D. Everyone needed an exercise in their lives.7. Which of the following can be the best title for the text?A. Healthy People Need More ExerciseB. Take an Exercise, the Harder, the BetterC. Cycling Is the Best Way to Prevent AgingD. A Lifetime of Exercise Slows Aging ProcessCHave you ever been sad because of failure? Please remember, for quite often achieving what you set out to do is not the most important thing.A boy decided to dig a deep hole behind his house. As he was working, a couple of older boys stopped by to watch. “What are you doing?” asked one of the visitors. “I want to dig a hole all the way through the earth!” the boy answered excitedly. The older boys began to laugh, telling him that digging a hole all the way through the earth was impossible. After a while, the boy picked up a jar. He showed it to the visitors. It was full of all kinds of stones and insects. Then he said calmly and confidently, “Maybe I can’t finish digging all the way through the earth, but look at what I’ve found during this period!”Theboy’s goal was far too difficult, but it did cause him to go on. And that is what a goal is for－to cause us to move in the direction we have chosen, in other words, to cause us to keep working!Not every goal will be fully achieved. Not every job will endup with a success. Not every dream will come true. But when you fall short of your aim, maybe you can say, “Yes, but look at what I’ve found along the way! There are so many wonderful things having come into my life because I tried to do something!” It is in the digging that life is lived. It is the unexpected joy on the journey that really makes sense.8. The older boys laughed at the boy because he was thought to be______.A. braveB. impoliteC. foolishD. warm-hearted9. Why did the boy show the jar to the older boys?A. To drive them away.B. To show what he had found in digging.C. To show how beautiful the jar was.D. To attract them to join him in the work.10. What can be learnt from the fourth paragraph of the text?A. No dream can come true.B. All work will end successfully.C. Goals shouldn’t be set too high.D. Goals will make us work harder.11. The best title for the text should be______.A. A Boy Dug a HoleB. Joy in the JourneyC. No Pain, No GainsD. Failure Is the Mother of SuccessDPreparations for the Tokyo Olympics have suffered another challenge after a survey found that 60% of people in Japan want them to be cancelled,less than three months before the Games are scheduled to open.Japan has extended a state of emergency in Tokyo and several other regions until the end of May as it struggles to control a fast increase in COVID-19 cases caused by new, more catching variants（变异体）with medical staff warning that health services in some areas are on the edge of breaking down.The Olympics, which were delayed by a year due to the pandemic, are set to open on 23 July, with the International Olympic Committee（IOC）and organizers insisting that measures will be put in place to ensure the safety of athletes and other visitors, as well as a nervous Japanese public.The survey, conducted between 7 and 9 May by the conservative Yomiuri Shimbun, showed 60% wanted the Games cancelled as opposed to 39% who said they should be held. “Postponement” — an option abandoned by the IOC — was not offered as a choice.Of those who said the Olympics should go ahead, 23% said they should take place without audience. Foreign audience have been banned but a final decision on native attendance will be made in June.Another poll conducted at the weekend by TBS News found 65% wanted the Games cancelled or postponed again, with 37% voting to give up the event altogether and 28% calling for another delay. A similar poll in Aprilconducted by Kyodo news agency found 70% wanted the Olympics cancelled or postponed.The IOC's vice president, John Coates, said that while Japanese sentiment about the Games “was a concern”, he could foresee no situation under which the sporting events would not go ahead.12. How many Japanese wish the Olympics would not be held in Tokyo according to the survey?A. 60%.B. 28%.C. 37%.D. 70%.13. What should be put into consideration if the Olympics open?A. The economic crisis.B. The urban transport.C. The safety of athletes.D. The health condition of citizens.14. What is some people's attitude towards foreign spectators in Paragraph 5?A. Welcome.B. Unfriendly.C. Cold.D. Unsupported.15. What can we conclude from John Coates'words?A. The Olympics will be stopped this year.B. The Olympics will be put off.C. The Olympics will be held normally.D. The Olympics will take place in other place.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。