广东省佛山市南海区桂城街道文翰中学 2020-2021学年下学期开学调研测试 九年级数学试卷
2020-2021学年佛山市南海区桂城中学高三英语月考试卷及答案解析
2020-2021学年佛山市南海区桂城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AI started working with my hands at a young age. The youngest of five brothers, I took on the role as a “maintenance (维修) man” at an early age for our family’s small grocery store. Often my dad wouldn’t give me a clear idea of how something shouldbe done, so I just had to figure it out by researching or through trial and error.Fast forward to 2016 and those problem-solving skills would become the focus of Tippecanoe High School’s Homebuilding class. I knew I wanted to teach the students skills that went beyond just being able to hammer nails or cut pieces of two-by-fours. The problem was that we didn’t have the resources at the time to do much else. The idea of attracting some type of funding seemed very important. Designing, building and selling a tiny house on wheels seemed like the perfect project to accomplishthe task. I reached out to a number of local businesses and most of them responded with the greatest support for what x k w we were doing.This year we added a new element to the program. Through one of our partners, we were able to connect with the nonprofit Veteran’s Ananda Incorporated. Students in the Homebuilding class are leading the design and production of micro houses to be donated to this organization. The new partnership gives the students another focus to consider when designing and building the houses.There has been no shortage of students since our first year. Three years ago we had 41 students, the next 191, and this year it was limited to just over 160 students so we could have a safe and manageable classroom environment. The number of girls taking the class has risen steadily over the last few years as well. This class offers something for everyone and the skills are universal.1. How can we describe the young author?A. He opened a small grocery store.B. He did a lot of research in the lab.C. He enjoyed doing hands-on activities.D. He learnt about maintenance from his father.2. What do the underlined words “the task” in paragraph 2 refer to?A. Getting some financial support.B. Selling a tiny house on wheels.C. Reaching out to many local businesses.D. Offering the students some problem-solving skills.3. What can be inferred about the Homebuilding class from the last paragraph?A. Its size needs increasing.B. Itis popular with the students.C. It has caused some safety concerns.D. Its classroom environment is hard to manage.BAfter almost an entire year of not going shopping and vacationing, you find the numbers reflected by your bank account meet your heart’ s desire.Now the most important question comes, what to do with the earnings? Should you fulfill dreams of the present, invest in preserving the future or perhaps keep saving it for a rainy day?Our elders always try to teach us the value of money and its moral weakness. One may be on a winning streak (连续成功) now, but it will not always be so. One will have days when there will be no sunshine but only rain, and their luck will hide behind those thick grey clouds. Save for those rainy days, they say. Do not spend too much, live within a budget,refrain fromcredit no matter how small and save for the future.Since the very first time we earn our own money from a summer job or earning our first salary, the lessons start. In fact, the pocket money that we receive when we are children begins the process of learning how to best manage one’ s money.People often think like this — one day when I have enough money, I will travel the world. Then, once we do earn enough money, tomorrow’ s plans start shadowing our present ones. However, is it wise to keep living for that future? Will we still enjoy or even be able to backpack in our 50s? How will we ever enjoy our present if we are constantly living for the future?Good questions, aren’ t they? I say travel but don’ t let yourself run dry, treat yourself to some luxuries but also keep enough for your necessities, and enjoy your present but with a plan for the foreseeable future. Life is for the living, so live it sensibly.4. Why do elders teach us to save money?A. Because there are more rainy days in life.B. Because no one can win streak.C. Because good days may end.D. Because money can’t buy everything.5. What does the underlined phrase “refrain from” mean in Paragraph 3?A. select fromB. hold backC. rely onD. prefer to6. Which of the following opinions would the author agree?A. To enjoy yourself in the right time.B. To wait to travel until we have enough money.C. To go backpacking in our 50s.D. To live for the future.7. What should we do with the earnings according to the author?A. We should save all for rainy days.B. We should fulfill our dreams.C. We should entertain ourselves.D. We should live the present wisely.CYou've probably heard it suggested that you need to move more throughout the day, and as a general rule of thumb, that "more" is often defined as around 10,000 steps. With many Americans tracking their stepsvia new fitness-tracking wearables, or even just by carrying their phone, more and more people use the 10,000-step rule as their marker for healthy living. Dr. Dreg Hager, professor of computer science at Johns Hopkins, decided to take a closer look at that 10,000-step rule, and he found that usingitas a standard may be doing more harm than good for many.“It turns out that in 1960 in Japan they figured out that the average Japanese man, when he walked 10,000 steps a day burned something like 3,000 calories and that is what they thought the average person should consume so they picked 10,000 steps as a number” Hager said.According to Hager, asking everyone to shoot for 10,000 steps each day could be harmful to the elderly or those with medical conditions, making it unwise for them to jump into that level of exercise, even if it's walking. The bottom line is that 10,000 steps may be too many for some and too few for others. He also noted that those with shorter legs have an easier time hitting the 10,000-step goal because they have to take more steps than people with longer legs to cover the distance. It seems that 10,000 steps may be suitable for the latter.A more recent study focused on older women and how many steps can help maintain good health andpromote longevity (长寿).The study included nearly 17,000 women with an average age of 72. Researchers found that women who took 4,400 steps per day were about 40% less likely to die during a follow-up period of just over four years: Interestingly, women in the study who walked more than 7,500 steps each day got no extra boost in longevity.8. What does the underlined word "it' in Paragraph 1 refer to?A. The phone recording.B. The 10,000-step rule.C. The healthy living.D. The fitness-tracking method.9. What does Paragraph 2 mainly talk about?A. How many steps a Japanese walks.B. How we calculate the number of steps.C. If burning 3,000 calories daily is scientific.D. Where 10,000 steps a day came from.10. Who will probably benefit from 10,000 steps each day according toHager?A. Senior citizens.B. Young short-legged people.C. Healthy long-legged peopleD. Weak individuals.11. How many steps may the researchers suggest senior citizens take each day?A. 4,400 steps.B. 10,000 steps.C. 2,700 steps.D. 7,500 steps.DDid you know that the average child has heard the word "no" over 20,000 times before they turn the age of three? Ironically, it is also around this time that children begin to develop enough personal character to refuse to obey. The "terrible twos" are categorized by a lack of understanding. Somewhere between three and four, children begin to acquire the skills to reason. It is during this time they watch how other children and adults reason. If we're not careful, the children will watch us model a world of "NOs".By the time a person turns eighteen, how many times have they been told no? I haven't found any studies that even attempted to track this statistic, but I'm sure if the number is 20,000 by three, then at eighteen that number has multiplied. You can do the math.Anyway, I think I know why we say no. We say no to protect. We say no to direct. We say no to stop potential confusion. However, do we sometimes say no just for the sake of saying no? Do we say no because we have internalized(内在化)all of the "NOs" we've heard over the years and we feel it is finally our time to say no tosomeone else?The internalized no can damage the growth process of dreams in infancy as quickly as it can weaken a three-year-old. And we wonder why we run intopeople with big, un-accomplished dreams who have a bit of a chip on their shoulder. They have to take on the 20,000 NOs. However, the thing that keeps them going is the possibility of the power of ONE YES! Just as it only takes one book to make a writer a Pulitzer Prize Winner, it only takes one word to change the course of your day. That word is YES!12. What do we know about two- year- olds?A. They understand well.B. They often say no to others.C. They think logically.D. They don't do all they're told.13. What effect does saying no have on children?A. They lose all their dreams.B. They aren't easy to succeed.C. They don't make mistakes.D. They never say yes to others.14. Which word best describes the author's attitude to a world of "NOs"?A. Tolerant.B. Disapproving.C. Favorable.D. Carefree.15. What is the text?A. A how-to guide.B. A survey report.C. An opinion essay.D. A short story.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。
_广东省佛山市南海区南海实验中学2020-2021学年七年级下学期数学开学考试
2020-2021学年初一下学期数学摸底考 班别: 姓名： 学号：一、选择题（本大题共10小题，每小题3分，共30分）1、2的相反数是（ ）A.21- B. 21 C.－2 D.2 2、下列计算正确的是（ ）A 、22a a a +=B 、235()a a =C 、22()ab ab -=D 、4322a a a ÷=3、已知一个阿米巴虫的质量约是0.000005克，则一个阿米巴虫的质量可表示为（ ）。
A 、6510-⨯克B 、5510-⨯克C 、5510⨯ 克D 、6510⨯克4、用一副三角尺画角，下面的角不能画出的是（ ）A 、70°的角B 、15°的角C 、150°的角D 、165°的角5、如果,x y a =为有理数，那么下列等式不一定成立的是 ( )A 、44y x -=-B 、22x y =C 、xa ya =D 、x y a a= 6、若2(3)(4)y y y my n +-=++，则m 、n 的值分别为( )A. 7,12m n ==B. 1,12m n ==-C. 1,12m n ==D. 1,12m n =-=-7、如图1，∠AOB 是直角，∠BOC ＝40°，OD 平分∠AOC ，则∠BOD 的度数是（ ）度。
A 、40B 、60C 、20D 、308、某车间原计划小时生产一批零件，后来每小时多生产件，用了小时不但完成了任务，而且还多生产件．设原计划每小时生产个零件，则所列方程为（ ）Ａ． Ｂ． Ｃ． Ｄ． 9、如果A 、B 、C 三点在同一直线上，且线段AB=6cm ，BC=4cm ，若M ，N 分别为AB ，BC 的中点，那么M ，N 两点之间的距离为（ ）A 、5cmB 、1cmC 、5或1cmD 、无法确定13101260x ()13121060x x =++()12101360x x +=+60101312x x +-=60101213x x +-=图110、若a=223-⎪⎭⎫ ⎝⎛-，b= 1(1)--，c=02⎪⎭⎫ ⎝⎛-π，则a ，b ，c 的大小关系是（ ） A 、a b c >> B 、a c b >> C. c a b >> D 、c b a >>二、填空题（本大题共7小题，每小题4分，共28分）11、计算：23(2)a -= ．12、若8,2==n m a a ,则m n a += .13、当1x =时，代数式22x x a -+的值为3，则当1x =-时，代数式22x x a -+= .14、如图所示，用图中所含字母表示阴影部分面积 .15、在钟表上，3:30所对应的时针和分针的夹角是__________。
2020-2021学年南海区桂城中学高三语文下学期期中试题及参考答案
2020-2021学年南海区桂城中学高三语文下学期期中试题及参考答案一、现代文阅读（36分）(一)现代文阅读I(9分)阅读下面的文字，完成下面小题。
理水（节选）鲁迅当两位大员回到京都的时候，别的考察员也大抵陆续回来了，只有禹还在外。
他们在家里休息了几天，水利局的同事们就在局里大排筵宴，替他们接风。
这一天真是车水马龙，不到黄昏时候，主客就全都到齐了，院子里却已经点起庭燎来，鼎中的牛肉香，一直透到门外虎贲的鼻子跟前，大家就一齐咽口水。
酒过三巡，大员们就讲了一些水乡沿途的风景，芦花似雪，泥水如金，黄鳝膏腴，青苔滑溜……等等。
微醺之后，才取出大家采集了来的民食来，都装着细巧的木匣子，盖上写着文字，有的是伏羲八卦体，有的是仓颉鬼哭体，大家就先来赏鉴这些字，争论得几乎打架之后，才决定以写着“国泰民安”的一块为第一，因为不但文字质朴难识，有上古淳厚之风，而且立言也很得体，可以宣付史馆的。
局外面也起了一阵喧嚷。
一群乞丐似的大汉，面目黧黑，衣服破旧，竟冲破了断绝交通的界线，闯到局里来了。
卫兵们大喝一声，连忙左右交叉了明晃晃的戈，挡住他们的去路。
“什么？——看明白！”当头是一条瘦长的莽汉，粗手粗脚的，怔了一下，大声说。
卫兵们在昏黄中定睛一看，就恭恭敬敬的立正，举戈，放他们进去了。
局里的大厅上发生了扰乱。
大家一望见一群莽汉们奔来，纷纷都想躲避，但看不见耀眼的兵器，就又硬着头皮，定睛去看。
头一个虽然面貌黑瘦，但从神情上，也就认识他正是禹；其余的自然是他的随员。
这一吓，把大家的酒意都吓退了，沙沙的一阵衣裳声，立刻都退在下面。
禹便一径跨到席上，并不屈膝而坐，却伸开了两脚，把大脚底对着大员们，又不穿袜子，满脚底都是栗子一般的老茧。
随员们就分坐在他的左右。
“大人是今天回京的？”一位大胆的属员，膝行而前了一点，恭敬的问。
“你们坐近一点来！”禹不答他的询问，只对大家说。
“查的怎么样？”大员们一面膝行而前，一面面面相觑，列坐在残筵的下面，看见咬过的松皮饼和啃光的牛骨头。
2020-2021学年南海区桂城中学高三英语模拟试题及参考答案
2020-2021学年南海区桂城中学高三英语模拟试题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AOne day when I was 5, my mother blamed me for not finishing my rice and I got angry. I wanted to play outside and not to be made to finish eating my old rice. When angrily opening the screen door (纱门) with my foot, I kicked back about a 12-inch part of the lower left hand corner of the new screen door. But I had no regret, for I was happy to be playing in the backyard with my toys.Today, I know if my child had done what I did, I would have blamed my child, and told him about how expensive this new screen door was, and I would have delivered a spanking (打屁股) for it. However, my parents never said a word. They left the corner of the screen door pushed out, creating an opening, in the defense against unwanted insects.For years, every time I saw that corner of the screen, it would constantly make me think about my mistake. For years, I knew that everyone in my family would see that hole and remember who did it. For years, every time I saw a fly buzzing (嗡嗡) in the kitchen, I would wonder if it came in through the hole that I had created with my angry foot. Iwould wonder if my family members were thinking the same thing, silently blaming me every time a flying insect entered our home, making life more terrible for us all. My parents taught me a valuable lesson, one that a spanking or stern (严厉的) words perhapscould not deliver. Their silent punishment for what I had done delivered a hundred stern messages to me. Above all, it has helped me become a more patient person and not burst out so easily.1. When the author damaged the door, his parents _______.A. gave him a spankingB. left the door unrepairedC. told him how expensive it wasD. blamed him for what he had done2. The experience may cause the author _______.A. not to go against his parents’ willB. to have a better control of himselfC. not to make mistakes in the futureD. to hide his anger away from others3. What is the main idea of this text?A. Parents is the best way to solve problems.B. Parents are the best teachers of their children.C. Adults should ignore their children’s bad behavior.D. Silent punishment may have a better effect on educating people.BIt might have been Jimmy Kimmel, or any other sharp-tongued talk show hosts of late-night TV. In this instance, it was Samantha Bee, stating her opposition to childhood vaccinations humorously. “Who are you going to believe?” she asked. “Leading authorities on medical science, or 800 comments on your cousin’s Facebook page?”Joking about science can have serious effects, according to studies by communication scholars. Accordingly, since 2013, Paul, a psychological professor, has conducted studies of how satire (讥讽) can influence people’s beliefs about science, which have shown that if you want to interest people in science and shape their views on hot-button science issues, satirical humor can work better.Many Americans pay little attention to science. Even people who regularly watch TV news receive only scraps of science information in their media diet, because mainstream media outlets devote so little airtime to the subject. On top of that, some Americans may regard science as inaccessible.Yet satirical humor can reach viewers who would never watch NOVA or read — well, National Geographic. Millions of people watch late-night television programs live, and videos of these shows get millions of views on streaming services. In 2016, a vote conducted by the University of Delaware Center indicated that nearly one in 10 said they learned about science from late-night television shows.Late-night hosts may occasionally poke fun at scientists. More often, however, the hosts promote a positive image of science. By making science entertaining to audience with little knowledge of the topic, late-night television could spark science engagement. Furthermore, the researchers concluded that satirical shows had the biggest impact among the least educated viewers, thus helping to narrow a gap in attention to science. Though late-night satirical humor can boost science interest and awareness, it has its limits. Science is complex, and conveying that complexity in a few minutes while telling jokes can be a challenge.4. What does Paul’s studies of joking about science indicate?A. It may do serious damage to science.B. It can effectively popularize science.C. It totally changes people’s attitude to science.D. It will shift people’s attention from entertainment to science.5. Why do TV watchers receive a little science information?A. Because they enjoy watching entertainments.B. Because science is not easy to come up with.C. Because they find no interest in science issues.D. Because science is scarcely seen on mainstream media.6. What do we know about the late-night shows involving science?A. The hosts get used to playing tricks on scientists.B. The hosts’ aim is to build a positive image of science.C. Education gap can be bridged through late-night shows.D. Science participation can be promoted among their viewers.7. What’s the author’s attitude towards combining science with satire?A. Critical.B. Objective.C. Positive.D. Negative.CA 10-year-old swimmer with sky-high dreams and a name to match them has broken a record previously held by Olympian Michael Phelps.Clark Kent Apuada, whose friends call him“Superman", swam the 100-meter butterfly in 1:09.38 at the Far Western Long Course Championships in his home state of California this Sunday. That's a second faster than the record Phelps set at the same event in 1995 with a time of 1: 10. 48 in the same category of boys under 10.Clark, a rising fifth-grader who is Filipino-American, told HuffPost he's been dreaming about breaking Phelps' record ever since he started swimming competitively at age 7."I was so motivated,"Clarksaid about his win."I was so happy that I was able to beat that record.”Phelps competed in his first Olympics at age 15. He went on to become the mostdecoratedOlympian in history, with 28 medals overall. “Everyone in the crowd was excited when they realized what a special swim they had just seen when we announced the long-standing record had been broken,"Cindy Rowland,Pacific Swimming's director, wrote in an email.Clarkwon first place for all the swimming events he competed in at this year's Far Western Championships. Pacific Swimming or PacSwim, a regional association that is part of USA Swimming, organizes the Far Western Long Course Championships. Cynthia Apuada,Clark' s mother,said that her child seems to be “living by his name at this point”。
2024届广东省佛山市南海区桂城中学高三下学期开学摸底考化学试题试卷含解析
2024届广东省佛山市南海区桂城中学高三下学期开学摸底考化学试题试卷考生请注意：1．答题前请将考场、试室号、座位号、考生号、姓名写在试卷密封线内，不得在试卷上作任何标记。
2．第一部分选择题每小题选出答案后，需将答案写在试卷指定的括号内，第二部分非选择题答案写在试卷题目指定的位置上。
3．考生必须保证答题卡的整洁。
考试结束后，请将本试卷和答题卡一并交回。
一、选择题（每题只有一个选项符合题意）1、下列说法中正确的是（）A．60﹪-70﹪的甲醛水溶液称为福尔马林具有防腐杀菌的效果B．液溴可以加少量水保存在棕色的试剂瓶中C．苯酚溅到皮肤上，立即用水冲洗，然后涂上稀硼酸溶液D．油脂不能使溴水褪色2、25℃时，改变某醋酸溶液的pH，溶液中c（CH3COO-）与c（CH3COOH）之和始终为0.1mol·L-1，溶液中H+、OH-、CH3COO-及CH3COOH浓度的常用对数值（lgc）与pH的关系如图所示。
下列说法错误的是（）A．图中③表示lg c（H+）与pH的关系曲线B．0.1mol·L-1CH3COOH溶液的pH约为2.88C．lg K（CH3COOH）=4.74D．向0.10mol·L-1醋酸钠溶液中加入0.1mol醋酸钠固体，水的电离程度变大3、如图是一种可充电锂电池，反应原理是4Li＋FeS2Fe＋2Li2S，LiPF6是电解质，SO(CH3)2是溶剂。
下列说法正确的是（）A．放电时，电子由a极经电解液流向b极B．放电时，电解质溶液中PF6-向b极区迁移C．充电时，b极反应式为Fe＋2Li2S－4e-=FeS2＋4Li+D．充电时，b极消耗5.6gFe时在a极生成0.7gLi4、下列表示不正确的是( )A．CO2的电子式B．Cl2的结构式Cl—ClC．CH4的球棍模型D．Cl－的结构示意图5、下列有机物命名正确的是（）A ．氨基乙酸B ．2—二氯丙烷C ．2—甲基丙醇D．C17H33COOH硬脂酸6、下列实验操作对应的现象和结论均正确的是（）选项操作现象结论A相同温度下，测定等浓度的NaHCO3和NaHSO4溶液的pH前者pH比后者大非金属性：S＞CB将相同体积、相同pH的盐酸和醋酸溶液分别稀释a、b倍稀释后溶液pH相同a＞bC向25mL沸水中滴加5~6滴FeCl3饱和溶液，继续煮沸生成红褐色沉淀制得Fe(OH)3胶体D向H2O2溶液中滴加少量硫酸酸化的FeSO4溶液溶液变为棕黄色后迅速出现大量气泡Fe2+催化H2O2发生分解反应生成O2A．A B．B C．C D．D7、在由水电离产生的H＋浓度为1×10－13mol·L－1的溶液中，一定能大量共存的离子组是①K＋、ClO－、NO3－、S2－②K＋、Fe2＋、I－、SO42－③Na＋、Cl－、NO3－、SO42－④Na＋、Ca2＋、Cl－、HCO3－⑤K＋、Ba2＋、Cl－、NO3－A．①③B．③⑤C．③④D．②⑤8、属于人工固氮的是A．工业合成氨B．闪电时，氮气转化为NOC．用NH3和CO2 合成尿素D．用硫酸吸收氨气得到硫酸铵9、火山爆发产生的气体中含有少量的羰基硫（分子式是：COS），已知羰基硫分子结构与CO2类似，有关说法正确的是（）A．羰基硫是电解质B．羰基硫分子的电子式为：C．C、O、S三个原子中半径最小的是CD．羰基硫分子为非极性分子10、下列有关实验的叙述完全正确的是A．A B．B C．C D．D11、下列做法中观察到的现象可以说明钠的密度比水小的是A．用小刀切开金属钠B．将钠放在坩埚中加热C．把钠保存在煤油中D．将钠放入盛水的烧杯12、将一定体积的CO2缓慢地通入V L NaOH溶液中，已知NaOH完全反应，若在反应后的溶液中加入足量石灰水，得到ag沉淀；若在反应后的溶液中加入足量CaCl2溶液，得到bg沉淀，则下列说法正确的是A．参加反应的CO2的体积为0.224 aLB．若a=b，则CO2与NaOH溶液反应的产物中盐只有Na2CO3C．b可能等于a、小于a或大于aD．不能确定NaOH溶液的物质的量浓度13、下列有关氨气的制备、干燥、收集和尾气处理错误的是A．图甲：实验室制氨气B．图乙：干燥氨气C．图丙：收集氨气D．图丁：实验室制氨气的尾气处理14、如图表示某个化学反应过程的能量变化。
2024届广东省佛山市南海区桂城中学高三调研测试物理试题
2024届广东省佛山市南海区桂城中学高三调研测试物理试题注意事项：1．答卷前，考生务必将自己的姓名、准考证号、考场号和座位号填写在试题卷和答题卡上。
用2B 铅笔将试卷类型（B ）填涂在答题卡相应位置上。
将条形码粘贴在答题卡右上角"条形码粘贴处"。
2．作答选择题时，选出每小题答案后，用2B 铅笔把答题卡上对应题目选项的答案信息点涂黑；如需改动，用橡皮擦干净后，再选涂其他答案。
答案不能答在试题卷上。
3．非选择题必须用黑色字迹的钢笔或签字笔作答，答案必须写在答题卡各题目指定区域内相应位置上；如需改动，先划掉原来的答案，然后再写上新答案；不准使用铅笔和涂改液。
不按以上要求作答无效。
4．考生必须保证答题卡的整洁。
考试结束后，请将本试卷和答题卡一并交回。
一、单项选择题：本题共6小题，每小题4分，共24分。
在每小题给出的四个选项中，只有一项是符合题目要求的。
1、一束由a 、b 两种单色光组成的复色光射向玻璃制成的三棱镜，通过三棱镜的传播情况如图所示。
关于a 、b 两种单色光，下列说法正确的是（ ）A ．玻璃对a 色光的折射率大于对b 色光的折射率B ．a 色光的光子能量小于b 色光的光子能量C ．a 色光在玻璃中的传播速度比b 色光小D ．a 色光发生全反射的临界角比b 色光小 2、平均速度定义式为s v t ∆=∆，当△t 极短时，st∆∆可以表示物体在t 时刻的瞬时速度，该定义应用了下列哪种物理方法（ ） A ．极限思想法 B ．微元法 C ．控制变量法 D ．等效替代法3、如图所示，两光滑圆形导轨固定在水平面内，圆心均为O 点，半径分别为10.2m r =，20.1m r =，两导轨通过导线与阻值2ΩR =的电阻相连，一长为1r 的导体棒与两圆形导轨接触良好，导体棒一端以O 点为圆心，以角速度100rad/s ω=顺时针匀速转动，两圆形导轨所在区域存在方向竖直向下、磁感应强度大小2T B =的匀强磁场，不计导轨及导体棒的电阻，下列说法正确的是（ ）A．通过电阻的电流方向为由b到aB．通过电阻的电流为2AC．导体棒转动时产生的感应电动势为4VD．当2r减小而其他条件不变时，通过电阻的电流减小4、如图，两个小球分别被两根长度不同的细绳悬于等高的悬点，现将细绳拉至水平后由静止释放小球，当两小球通过最低点时，两球一定有相同的( )A．速度B．角速度C．加速度D．机械能5、在一大雾天，一辆小汽车以30m/s的速度行驶在高速公路上，突然发现正前方30m处有一辆大卡车以10m/s的速度同方向匀速行驶，小汽车紧急刹车，刹车过程中刹车失灵。
广东省佛山市南海区桂城街道文翰中学2021-2022学年九年级下学期第一次大测数学试题(解析版)
∴A1的纵坐标是1，A2的纵坐标是2．
在直线y=x+1中，令x=3，则纵坐标是：3+1=4=22；
则A4的横坐标是：1+2+4=7，则A4的纵坐标是：7+1=8=23；
据此可以得到An的纵坐标是：2n﹣1，横坐标是：2n﹣1﹣1．
故点An的坐标为（2n﹣1﹣1，2n﹣1）．
【17题答案】
【答案】（2n﹣1﹣1，2n﹣1）
【解析】
【详解】分：∵B1的坐标为（1，1），点B2的坐标为（3，2），
∴正方形A1B1C1O1边长为1，正方形A2B2C2C1边长为2，
∴A1的坐标是（0，1），A2的坐标是：（1，2），
代入y=kx+b得 ，
解得： ．
则直线的解析式是：y=x+1．
【答案】 ##
【解析】
【分析】如下图，先构造出直角三角形，然后根据sin∠CAB的定义求解即可．
【详解】解：如下图，过点C作AB的垂线，交AB延长线于点D
设网格中每一小格的长度为1
则CD=2，AD=4
∴在Rt△ACD中，AC=
∴sin∠CAB=
故答案为： ．
【点睛】本题考查锐角三角函数的求解，解题关键是构造出直角三角形．
故选D．
【点睛】本题考查相似三角形的判定和性质，直角三角形斜边中线的性质，勾股定理等知识，解题的关键是熟练掌握基本知识，属于中考常考题型．
二、填空题（本大题7小题，每小题4分，共28分）
11.将方程x（x﹣1）＝3x+1化为一元二次方程的一般形式_____．
【11题答案】
【答案】x2﹣4x﹣1＝0
【解析】
故选：B．
2020-2021学年佛山市南海区桂城中学高三英语下学期期中考试试卷及答案解析
2020-2021学年佛山市南海区桂城中学高三英语下学期期中考试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AThe Internet can provide a wealth of educational resources for small children, if you know where to look.Enchanted LearningEnchanted learning is a great website for children, and I know several teachers who rely on it for materials for their classrooms. Most of the information is free, but for $ 20.00 per year, you can purchase a membership that allows you to have access to the site without the advertising. The pages here are great. There are color1 ed pages and worksheets for toddlers (学步儿童) and school-age children.StarfallStarfall is another good educational website for small children. Teachers often use this website in classrooms. It emphasizes reading skills for early learners. The website is aimed at first-grade-level learners, but it has tools that can help all children from pre-K to second grade. The website has reading activities, worksheets to download, and a store where you can purchase educational materials for your children.Sesame Street WorkshopKids loveSesame Street, and it is always educational. This is one of the funniest websites online for children because it is very well animated and has great sound effects. The website has games and stories for small kids, and they can create letters at the post office and mail them to their favorite characters.1. Why does Enchanted Learning offer purchasing memberships?A. Charging for the information.B. Charging for downloading materials.C. Giving access to the site without the ads.D. Providing unlimited search for more pages.2. Where can you buy educational materials for your children?A. Enchanted LearningB. StarfallC. Sesame Street WorkshopD. Colored pages3. What is the purpose of this text?A. To introduce.B. To discuss.C. To persuade.D. To educate.BMikah Frye, a 9-year-old boy, was walking down the streets with his grandmother discussing Christmas gifts when he saw some homeless people struggling to stay warm in the cold night. Then he was thinking about a way to help the homeless to spend a warm Christmas.That thought stayed in Mikah Frye’s mind and when he reached home, Mikah informed his parents not to buy the Microsoft XBox gaming device he had asked for earlier. Mikah realized that by not buying the $300 device, he could instead donate over 30 blankets to the homeless. He knew how much it meant to be warm in the cold holiday season.Three years ago, Mikah and his parents were the ones living in a homeless shelter. Having suffered a financial crisis, they too had lost their house, not knowing where their next meal would come from and sharing a blanket every night. Mikah was six years old then but he remembered what it was like to have to give back that precious blanket every morning.Reaching out to the emergency shelter programme that looked after them 3 years ago, the family donated 60 blankets in the end, each with a personalized message of hope in Mikah’s handwriting stating: “They gave me a blanket, but I had to leave it. That’s why I want you to have your own blanket. Today, I live in my own house, and someday you will too. Your friend, Mikah.”The homeless people at the shelter may not have been able to give Mikah a Christmas gift in return but his gesture was noted by the billion dollar company Microsoft who made sure that Mikah was fooled into visiting their store so that Santa Claus could personally deliver an XBox from the company to him as a reward for making the top of “Santa’s list of nice boys” that year.4. Why did Mikah give up his Christmas gift?A. The device was out of date.B. His parents had a tight budget.C. He wanted to spend a warm Christmas.D. He decided to do something charitable.5. What made Mikah have a better understanding of the situation of the homeless?A. His own experience.B. His parents’ education.C. His visiting to the emergency shelter.D. The cold weather during the holiday season.6. What can be inferred from the last two paragraphs?A. The homeless gave Mikah a gift in return.B. He finally got the gift he wanted on Christmas.C. The company Microsoft fooled Mikah into buying an Xbox.D Mikah wrote a thank-you note to the emergency shelter he lived in.7. What might be the best title for the text?A. Mikah’s Precious Christmas GiftB. Mikah’s Giving Warmth on ChristmasC. Microsoft Rewarded Nice Boys on Santa’s ListD. The Homeless Needed Blankets on a Cold ChristmasCFor 30 years we have been told how temperatures have been rising rapidly to unheard of levels. This is causing polar ice to melt, sea-levels to rise and has brought about adangerous increase in extreme weather events. These intense climatic changes would likely present challenges to our society and environment.The causes of climate change are mainly anthropogenic (人为的) in nature. Since the industrial revolution, human activities have increased the amount of greenhouse gases in the atmosphere. The increased amount of gases which absorb heat has led to more heat being kept in the atmosphere, causing global warming.The certainty of global warming can be seen through some of the natural phenomena like the effect on crops and extreme weather conditions around the world. The most recent assessment report says that the earth’s average temperature has risen by 0. 74 degrees in the period from 1906 to 2005, and that the average temperature will continue to rise. There have also been more violent downpours, sea levels have risen and the ice at the world’s poles and on its mountains is melting. The rising sea level is flooding the low-lying countries inAsiaand small islands in the Pacific. This may lead to the displacement of millions of people, loss of millions of land and consequently billions of dollars.Troubled by the serious situation, world leaders came together for the 2015 United Nations (UN) Climate Change Conference inParis. The climate talks led to 196 countries reaching a landmark agreement that will, for the first time, commit nearly every country to lowering planet-warming greenhouse gas emissions to address global climate change. That was certainly an encouraging step forward for our earth and mankind!As the world leaders continue to commit themselves to monitor our sick planet, we need to continue to take small steps to heal the world. We are left with not much of a choice. If only we could just pack our bags and migrate to Mars!8. What does paragraph 2 mainly talk about?A. The information of industrial revolution.B. The greenhouse gases in the atmosphere.C. The reasons of climate change.D. The result of extreme weather events.9. What can we infer from the last paragraph?A. We have made great achievements.B. Some measures are still required to take.C. Mars is suitable for people’s living.D. Some countries will receive urgent aid.10. Which can be a suitable title for the text?A. Long Live Planet Earth!B.Environment Changes Rapidly!C. What Serious Global Warming!D. How Important the UN Agreement Is!11. Which of the following shows the structure of the whole text?A. B.C. D.DIn order to develop the pandemic-stricken economy, China recovered the street vendors（商贩）in a new nation-wide method known as “street stall economy'', allowing residents to set up open-air shops on the sidewalks or other available public spaces.Street vendors were once an important part ofChina's economy and urban landscape. However, sinceChina's economy took off in the last decade, street vendors have gradually disappeared from the streets and many of them opened shops of their own.Fast forward to today, street vendors have come into our sight again after cities such asChengduand Yantai succeeded in creating hundreds of thousands of jobs by giving street stalls permission to operate.China's tech industry was quick to jump on the street vendor trend, with tech giants including Alibaba, Tencent, Meituan and flocking todish outcheap loans, offer support and payment solutions to millions of owners of newlyestablished small businesses.Ant Financial, Alibaba's fintech arm, promised its mobile wallet app Alipay will give interest-free loans to 30 million vendors, and 70 billion RMB of interest-free credit line to consumers to make purchases everywhere, including street vendors. provided 50 billion RMB worth of quality goods for street vendors, and provided each one of them with a maximum 100,000 RMB interest-free loan to stock up.Tencent's WeChat announced to offer payment solutions, marketing supports and even training for up to 50 million street vendors, with the end goal of digitally transforming them to increase their income.Guangzhoucity partnered with WeChat this month to hold a live streaming shopping festival to improve sales of local produce. In attempts to promote various live streaming platforms, many tech CEOs also made their own live streamed e-commerce debuts（首次亮相）selling goods coming from all over the country.12. What does the underlined part “dish out" in Paragraph 3 mean?A. turn down.B. provide with.C. pay off.D. apply for.13. Compared with and Tencent, what unique measure did Ant Financial take?A. It provides interest-free loans for vendors.B. It offers interest-free credit line to customers.C. It provides quality goods for street vendors.D. It offers marketing support to businessmen.14. What's the purpose of the cooperation between WeChat andGuangzhoucity?A. To volunteer to train street vendors.B. To give away free goods to the poor.C. To promote to develop the local economy.D. To help CEOs make their own streaming platforms.15. What can be the best title for the text?A. Chengdu and Yantai Succeeded in Creating Job OpportunitiesB. "Street Vendor Economy” Greatly Increases People's IncomeC. The Whole Nation Are Involved in a New Economy ModelD.China's Major Tech Companies Are Helping With "Street Vendor Economy”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。
广东省佛山市南海区桂城街道文翰中学2023-2024学年七年级下学期月考数学试题(无答案)
文翰中学2023-2024学年度第二学期七年级期中考试数学科试题一、选择题（本题共10小题，每小题3分，共30分）1．若40A ∠=︒，则A ∠的补角的大小是（ ）A ．160︒B ．140︒C ．60︒D ．50︒2．蚕丝是大自然中的天然纤维，是中国古代文明产物之一，也成为散发着现代科学技术魅力的新材料．某蚕丝的直径大约是0.000016米，0.000016用科学记数法表示为（ ）A ．40.1610-⨯B ．51.610-⨯C ．31.610-⨯D ．41610-⨯3．要画一个面积为230cm 长方形，其长为cm x ,宽为cm y ,在这一变化过程中，常量与变量分别为（） A ．常量为30，变量为x 、y B ．常量为30、y ,变量为xC ．常量为30、x ,变量为yD ．常量为x 、y ,变量为304．下列四个图形中，过点B 作AC 的垂线，正确的是（ ）A ．B ．C ．D ．5．下列运算正确的是（ ）A ．23a a a +=B ．236a a a ⋅=C ．()347a a =D ．532a a a ÷=6．如图，在下列给出的条件中，不能判定AC DF ∥的是（ ）A ．12∠=∠B ．42180∠+∠=︒C ．23∠=∠D ．1A ∠=∠7．如图，AB BC ⊥于点,6B AB =,点P 是射线BC 上的一个动点，则线段AP 的长度可能是（ ）A ．3.5B ．4.5C ．5.5D ．6.58．如图，1∠与2∠是（ ）A ．内错角B ．同位角C ．同旁内角D ．对顶角 9．在实验课上，小亮利用同一块木板测得小车从不同高度（h ）与下滑的时间（t ）的关系如下表： 支撑物高()cm h10 20 30 40 50 … 下滑时间()s t 3.25 3.01 2.81 2.66 2.56 …以下结论错误的是（ ）A ．当40h =时，t 约2.66秒B ．随高度增加，下滑时间越来越短C ．估计当80h =时，t 一定小于2.56秒D ．高度每增加10cm ,时间就会减少0.24秒10．下列各组数不可能是一个三角形三边的边长的是（ ）A ．3,4,5B ．1,3,4C ．6,8,10D ．3,3,3二．填空题（本大题共5小题，每小题3分，共15分）11．若32m =,则23m =___________．12．小明以6千米/时的速度从A 地步行到B 地，若设他离A 地的距离为S 千米，步行时间为t 小时，则S 与t 之间的关系式为___________．13．如图，,AB CD EG AB ⊥∥,垂足为G ,若150∠=︒，则E ∠=___________．14．若2(3)(2)y y y my n +-=++,则m n +=___________．15．如图1，在矩形ABCD 中，2AB =,动点P 从点B 出发，沿路线B C D →→做匀速运动，图2是此运动过程中，PAB △的面积S 与点P 运动的路程x 之间的函数图象的一部分，当14BP BC =时，四边形APCD 的面积为___________．图1 图2三．解答题（一）（本大题共5小题，每题5分，共25分）16．计算：1201(2)(2023)3π-⎛⎫+-+- ⎪⎝⎭． 17．计算：()()32224234ab a b a b -⋅÷． 18．先化简，再求值：22()()()2m n m n m n m -++--,其中2,1m n ==．19．如图，已知：,,12AB AD CD AD ⊥⊥∠=∠．求证：AE DF ∥．20．利用尺规作图：如图，过点C 作AB 的平行线．（保留作图痕迹，不用写作法．）四．解答题（二）（本大题共3小题，21,22每题8分，23题10分，共26分）21．如图，在ABC △中，点D 、E 分别在AB BC 、上，且,12DE AC ∠=∠∥．（1）求证：AF BC ∥；（2）若AC 平分,50BAF B ∠∠=︒，求1∠的度数22．小强骑车从家到学校要经过一段先上坡后下坡的路，在这段路上小强骑车的距离s （千米）与骑车的时间t （分钟）之间的关系如图所示，请根据图中信息回答下列问题：（1）小强去学校时下坡路长___________千米；（2）小强去学校时下坡的速度为___________千米/分钟；（3）若小强回家时按原路返回，且上坡的速度不变，下坡的速度也不变，那么回家骑车走这段路的时间是多少分钟？23．在综合与实践课上，老师让同学们以“一副直角三角尺”为主题开展数学活动．小华同学在操作过程中让两个三角尺的直角顶点重合（90AOB COD ∠=∠=︒，45OAB OBA ∠=∠=︒，30ODC ∠=︒，60OCD ∠=︒）．图1 图2（1）如图1,EF GH ∥,当AB 和CD 恰好落在EF 和GH 上时，求BOC ∠的度数．（2）如图2，EF GH ∥,将三角尺AOB 和三角尺COD 绕点O 转动，在转动过程中，两块三角板无重叠部分，且点B 在直线EF 上方，点C 在直线GH 和直线EF 之间，OB 与EF 相交于点,M CD 与GH 相交于点N ,若70BMF ∠=︒，20CNH ∠=︒，求BOC ∠的度数．五．解答题（三）（本大题共2小题，每题12分，共24分）24．把几个图形拼成一个新的图形，再通过两种不同的方式计算同一个图形的面积，可以得到一个等式，也可以求出一些不规则图形的面积．图1 图2 图3例如，由图1，可得等式：22(2)()32a b a b a ab b ++=++．（1）由图2，可得等式：_______________________________．（2）利用（1）所得等式，解决问题：已知11,38a b c ab bc ac ++=++=,求222a b c ++的值．（3）如图3，将两个边长为a 、b 的正方形拼在一起，B 、C 、G 三点在同一直线上，连接BD 和BF ，若这两个正方形的边长a 、b 如图标注，且满足10,20a b ab +==．请求出阴影部分的面积．25．如图1，己知两条直线AB CD 、被直线MN 所截，交点分别为,M N MP 、交CD 于点P ,且AB CD ∥，PMN MPN ∠=∠．图1 图2 图3（1）判断MP 是否平分AMN ∠,并说明理由．（2）如图2，点E 是射线．．PD 上一动点（不与点P 、N 重合），MF 平分EMN ∠交CD 于点F ,过点F 作FQ MP ∥交AB 于Q ．①当点E 在线段．．PN 上时，若40MFQ ∠=︒，求MEN ∠的度数；②当点E 在运动过程中，设,MEN MFQ αβ∠=∠=,则α和β之间有怎样的数量关系？请写出你的猜想，并说明理由．。
2020-2021学年佛山市南海区桂城中学高三英语下学期期中试题及答案解析
2020-2021学年佛山市南海区桂城中学高三英语下学期期中试题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AWhat good films are coming out in March? Here are four films to watch this March.MulanIt’s another live-action remake of a classic Disney cartoon. It is based on an ancient Chinese girl who dresses up herself as a man so that she can join the army.Director Niki Caro and the actors show us wonderful battle scenes and Chinese Kung Fu.OnwardDragons, unicorns (独角兽) and other creatures are usually considered to only exist in ancient Greece, but in Onward, they are all still alive and kicking in the UStoday. Onward is about two brothers who go on a road trip in order to bring their father back from the dead. It is such a perfect film that it’s worth spending a few hours in the cinema.RadioactiveRadioactive tells us about a famous Polish-French scientist, Marie Curie who won the Nobel Prize twice but was finally killed by the radiation she studied. In the film. Curie is played by Rosamund Pike alongside Sam Riley as her husband Pierre Curie and Anya Taylor-Joy as their daughter Irene.MisbehaviorThe Miss World Beauty Contest may be out of fashion, but it used to be one of television’s biggest events.Misbehaviortells what happened when the event was staged at the Royal Albert hall in London in 1970. There could hardly be a more interesting topic for a film, even if it was set 50 years ago.1. What do we know about Onward?A. It praises a woman fighter.B. It is a Chinese story.C. It focuses on animal protection.D. It is a film about magic.2. Who does Rosamund Pike play?A. A soldier.B. A killer.C. A scientist.D. A designer.3. Which of the following films is set in the UK?A. Misbehavior.B. Onward.C. Radioactive.D. Mulan.BYou must have read "The Tortoise and the Hare(《龟兔赛跑》)" when you were younger. So which animal are you? The tortoise or the hare? Do you rush around trying to do things as quickly as possible? Or do you deal your work at a slow , but steady(稳定的)pace? Whether you approach life like the tortoise or the hare can make a difference in the results you'll see.Some will say that you should avoid being like the hare. After all. he was overconfident and finally lost the race. You mayalso have heard teachers say from time to time that "haste makes waste”. But what does that mean? Most people think it meant that the faster you do something,the more likely it is that you'll make mistakes. Many teaches wantyouto approach your schoolwork thoughtfully and carefully.But does haste always make waste? Not necessarily ! Some people are able to work quickly while also maintaining(保持)a high level of quality in all that they do. Recent research, however, is making the idea of haste making waste seem more believableResearchers found that the brain changes into a special mode(模式)when forced to make rapid decisions. Overall, there appears to be a trade-off between speed and correctness. As the brain makes decisions more quickly, those decisions are usually built on less information, which often leads to a greater likelihood of mistakes.When you approach things like the tortoise. you methodically and steadily work towards your goal. You might not arrive there first, but then again you might! In any case, you're likely to make fewer mistakes and you might just enjoy the journey more than the bare.Goals are great to work towards, but often the achievements aren't what we remember. In the end, the most meaningful and important parts of our lives are the journeys we went on , not the destination we reached. So be the hare when you have to, but always remember that the slow and steady journey is what you’ll remember and treasure the most.4. Why does the author mention the story in the first paragraph?A. To introduce the topic.B. To show its popularity.C. To suggest its importance.D. To advise readers to read it.5. For what purpose do teachers often say “haste makes waste to students?A. To ask them not to waste their time.B. To tell them it is OK to make mistakes.C. To ask them to avoid making silly mistakes.D. To tell them they should check their schoolwork.6. What is Paragraph 4 mainly about?A. How the brain collects the information it needs.B. When the decision made by the brain is correct.C. Why the quickly-made decision is often unwise.D. What the relationship between lime and results is.7. Which of the following may the author agree with?A. Finishing the race is often a victory for everyone.B. Joy is found not in finishing an activity but in doing it.C. The journey to every destination starts with a small step.D. A destination is important because it guides us on the journey.CBe it from the mouths of foreigners who have lived here for a few years or from stories on travel websites, one of the most common qualities that people list about Shanghai is the infectious energy that courses through the city.For some, this energy is defined by the way of life—Shanghai is a city that never sleeps. In the day, the streets arc always bustling with people from all over the world. After all, the city has long been China’s most cosmopolitan city, having been the epicenter of trade and cultural exchange between Chinese and foreigners since the city was forced to open its door to the world in 1843 after the First Opium War (1840-42).Shanghai’s ubiquitous delivery people can be found on the roads even past midnight, rushing from point to point on their trusty electric scooters to satiate the hunger of night owls. Even before the break of dawn, pensioners can be found gathering in parks, ready to kick start their day with a tai chi session.For others, this energy is generated from the friction between the contrasts the city has. Indeed, it does not take long for one to realize that Shanghai's charmlies in it being a binary of old and new.Here, charming neoclassical architecture and art deco structures stand alongside modem buildings with shimmering glass and metal facades, rustic (质朴的)lane houses and shikumen buildings. Humble mom-and-pop shops that look stuck in time can often be found right next tohipdining venues or industrial-chic fashion stores selling designer apparel.One of the best places to get an overview of these surreal contrasts is none other than the tallest building in the city — the Shanghai Tower in Lujiazui. Measuring a dizzying 632 meters in height, this architectural marvel boasts having the world's highest observation deck within a building or structure. It also comes with the world's fastest elevators which would get you from the bottom to the top at 20.5 meters per second.On the other side of the Huangpu River is where you would find the Bund, which is home to magnificent neoclassical buildings. The Bund is to Shanghai what Times Square is to New York or what the Champs-61ysees is to Paris. A trip to Shanghai would not be complete without exploring this iconic waterfront promenade.Autumn is the best time to experience Shanghai on foot, not merely because the weather is conducive for walking, but because this is when the roads and sidewalks in many areas are blanketed with a layer of color1 ful fallen leaves.8. Why is the example of delivery man mentioned?A. To make a contrast with pensioners’ biological clock.B. To illustrate the vibrant energy of modern Shanghai.C. To highlight the diligence and consideration of delivery man.D. To feature the courier delivery service in full swing.9. Which of the following is TRUE about the contrast of Shanghai?A. The contrast mainly arises from the First Opium War.B. The design of the Shanghai Tower stands for a contrast.C. A marked contrast is shown in the use of building materials.D. The dishes served in mom-and-pop shops represent the outdated flavor.10. The underlined word “hip” in paragraph 5 is closest in meaning to________.A. photographicB. modestC. peculiarD. stylish11. Which of the following will be most probably discussed following the last paragraph?A. Stunning views of the Shanghai skyline.B. The best places to view the seasonal spectacle.C. The walking path thathugs the Huangpu River.D. Must-try dishes and food items typical of Shanghai.DThere have been many fine films over the past several years aboutcharacters struggling with Alzheimer’s disease. But few of them have gone as deeply and frighteningly into the corners of adeterioratingmind as TheFather,a powerful new drama built around a spellbinding performance from Anthony Hopkins.At this point in his long career,Hopkinswould seem to have exhausted his ability to surprise us, but his work here is nothing short of astonishing. His character, also named Anthony, is 80 years old and has dementia. At the beginning of the movie, his daughter, Anne — played by Olivia Colman — stops by hisLondonapartment to check on him. Her father's condition has taken a turn for the worse, and his temper has become severe enough to send his latest live in nurse packing. Anthony is stubborn and defiant and insists that he can manage on his own. But that's clearly not the case, given his habit of misplacing his things and his inability to remember names and faces, Anne's included.As The Father goes on, the more it becomes clear that it's his own mind that's playing tricks on him. What makes the movie so unsettling is the way it wires us directly into his subjective experience, so that the foundations of the story seem to shift at random from scene to scene. A man suddenly appears in the apartment, claiming to be Anne's husband, which is odd, since just a few moments earlier, Anne seemed to be single. Anne goes out shopping for groceries, but when she returns, she's played not by Olivia Colman but by another actress, Olivia Williams. Even the apartment itself begins to shift. You notice puzzling differences-wasn't there a lamp on that hallway table just a moment ago?The story in The Father may be complicated but it's also heartbreakingly simple: man grows old and loses his memory, and his daughter, after lifetime of love and devotion, must begin the long painful process of saying goodbye.Hopkinsshows us Anthony's struggle to keep his sense about him. It's a striking performance-and an impossible one to forget.12. What does the underlined word “deteriorating” mean in the first paragraph?A. Worsening.B. Narrowing.C. Recovering.D. Improving.13. What do we learn about the character Anthony in the movie?A. He can take care of himselfB. He drives away the nurses.C. He is easy-going and forgetful.D. He lives with his daughter all the time.14. The shift of scenes in the movie is designed to .A. build the dramatic tension in the family.B. show off the well-designed story line.C. frighten the movie-goers with mysterious plot.D. involve the viewers into thedisordered memories.15. What does the author think ofHopkins?A. He has run out of his talent.B. He is not suitable for the roleC. He masterly plays the old man.D. He presents an odd performance.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。
广东省佛山市南海区桂城街道文翰中学2023-2024学年九年级下学期6月月考数学试题
广东省佛山市南海区桂城街道文翰中学2023-2024学年九年级下学期6月月考数学试题一、单选题1．凝固点是晶体物质凝固时的温度，标准大气压下，下列物质中凝固点最低的是（ ）A ．钨B ．水银C ．煤油D ．水2．对244x -进行因式分解，正确的是（ ）A ．()()244411x x x -=+-B ．()224441x x -=- C ．()()244422x x x -=+- D ．()()2442222x x x -=+-3．如图小明在点C 处测得树顶端A 的仰角为α，且20BC =米，则树高度AB 为（ ）米A ．20tan αB ．20tan αC ．20sin αD ．20sin α4．《淮南万毕术》是世界上最早记载潜望镜原理的古书，潜望镜内部通常包含两个互相平行的平面镜，基于光的反射，可得到一组平行线．如图，这是潜望镜工作原理的示意图，它所依据的数学定理是（ ）A ．两点之间，线段最短B ．两点确定一条直线C ．内错角相等，两直线平行D ．同旁内角互补，两直线平行5．不等式组13315x x -+≥⎧⎨-<⎩的解集是（ ） A ．2x ≥- B ．2x < C ．22x -≤< D ．2x ≤-6．已知点()12,A y -，()21,B y -，()31,C y 均在反比例函数2y x =的图象上，则1y ，2y ，3y 的大小关系是（ ）A ．123y y y <<B ．213y y y <<C ．312y y y <<D ．321y y y << 7．如图，在ABC V 中，30B ∠=︒，50C ∠=︒，通过观察尺规作图的痕迹，DAE ∠的度数是（ ）A ．35︒B ．60︒C ．70︒D ．85︒8．我国古代著作《增删算法统宗》中记载了一首古算诗：“庭前孩童闹如簇，不知人数不知梨．每人四梨多十二，每人六梨恰齐足．”其大意是：“孩童们在庭院玩耍，不知有多少人和梨子，每人分4梨，多12梨；每人分6梨，恰好分完．”设孩童有x 人，则可列方程为（ ） A ．4126x x += B ．4126x x -= C ．1246x x += D ．1246x x -= 9．如图，正五边形ABCDE 内接于O e ，点F 是O e 上的一个动点，当F 沿着B A E DC →→→→的路径在圆上运动的过程中（不包括B ，C 两点），BFC ∠的度数是（ ）A ．36︒B ．72︒C ．54︒D ．不确定10．如图，在ABC V 中，90ABC ∠=︒，以点A 为圆心，AB 的长为半径画弧交AC 于点D ，以点B 为圆心，AB 的长为半径画弧交BC 于点E ，且这条弧恰好也经过点D ，若4AC =，则图中阴影部分的面积为（ ）A ．2π3B ．2π3C ．π3D π3二、填空题11．12．在一个不透明的口袋中装有3个红球和若干个白球，小球除颜色外其余均相同，通过多次摸球实验后发现摸到红球的频率稳定在25%，则口袋中白球的个数可能是个． 13．生活中做拉面的过程渗透着数学知识，一定体积的面团做成拉面，面条总长度与面条粗细（横截面面积）存在一定的函数关系；项目化学习小组的同学用一块面团进行了试验，并将数据整理如下：根据以上数据可知，当面条总长度为220cm 时，面条粗细为2cm ．14．《海岛算经》是中国古代测量术的代表作，原名《重差》，这本著作建立起了从直接测量向间接测量的桥梁．直至近代，重差测量法仍有借鉴意义，如图，为测量海岛上一座山峰AH 的高度，直立两根高1米的标杆BC 和DE ，两杆间距BD 为3米，D ，B ，H 三点共线，从点B 处退行到点F ，观察山顶A ，发现A ，C ，F 三点共线，且仰角为45︒；从点D 处退行到点G ，观察山顶A ，发现A ，E ，G 三点共线，且仰角为37︒（点F ，G 都在直线HB 上）．则山峰AH 的高是米（参考数据：3sin 375︒≈，4cos375≈︒，3tan 374︒≈）15．如图，Rt BEF △的顶点F 在矩形ABCD 的对角线AC 上运动，连接AE ．若E B F A C D ∠=∠，24AB BC ==，，则AE 的最小值为．三、解答题16．化简：2221311a a a a --⎛⎫÷- ⎪--⎝⎭17．解方程：24320x x --=．18．如图，在ABC V 和BAD V 中，BC 与AD 交于点O ，12∠=∠，请你再添加—个条件：______，使得ABC BAD ≌△△，并说明理由．19．《墨经》中记教的“小孔成像”是世界上最早的关于光学问题的论述，如图，根据小孔成像的科学原理，当像距（小孔到像的距离）和物高（蜡烛火焰高度）不变时，火焰的像高y （cm ）是物距（小孔到蜡烛的距离）x （cm ）的反比例函数，当6x =时，2y =．若火焰的像高为3cm ，求小孔到蜡烛的距离．20．4月23日是世界读书日，某校开展了以“诵读经典，传承文化”为主题的读书活动，该校对本校学生4月份的读书量进行了随机抽样调查，并对调查结果进行了统计，绘制了如下不完整的统计表和扇形统计图．读书量统计表(1)本次调查共调查了多少名学生？(2)填空：=a ______，扇形统计图中“2本”部分所对应的圆心角的度数为______． 21．学生社团作为校园文化的重要载体，是培养学生兴趣爱好，扩大求知领域，陶冶思想情操，展示才华智慧的舞台．某中学社团联合举办了“青春汇聚迎盛会，百团奋进正当时”的主题活动，鼓励学生积极参与社团活动．与此同时，学校计划为参加活动的同学购买一批奖品．经了解，购买2个A 种奖品和1个B 种奖品需花费64元，购买1个A 种奖品和4个B 种奖品需花费88元． (1)求A ，B 两种奖品的单价；(2)学校需采购两种奖品共60个，且A 种奖品的数量大于B 种奖品数量的2倍．设购买A 种奖品a 个，那么如何购买才能使花费最少？最少花费多少元？22．如图，AB 是O e 的直径，弦CD AB ⊥于点E ，点P 在O e 上，PBC C ∠=∠．(1)求证：CB PD ∥；(2)若12BC =，2cos 3CBE ∠=，求O e 的半径． 23．综合与实践生活中的数学：如何确定单肩包的最佳背带长度？素材1：如图1是一款单肩包，背带由双层部分、单层部分和调节扣构成．使用时可以通过调节扣加长或缩短单层部分的长度，使背带的总长度加长或缩短．总长度为单层部分与双层部分的长度和，其中调节扣的长度忽略不计．素材2：对该款单肩包的背带长度进行测量，设双层部分的长度是cm x ，单层部分的长度是cm y ，得到几组数据如下表所示．素材3：单肩包的最佳背带总长度与身高的比为2:3．素材4：小明爸爸准备购买此款单肩包．爸爸自然站立，将该单肩包的背带调节到最短提在手上（背带的倾斜忽略不计），背带的悬挂点离地面的高度为53.5cm ；如图2，已知爸爸的臂展和身高一样，且肩宽为38cm ，头顶到肩膀的垂直高度为身高的18． 请根据以上素材，解答下列问题：(1)如图3，在平面直角坐标系中，以所测得数据中的x 为横坐标，y 为纵坐标，描出所表示的点，并用光滑曲线连接；根据图象思考y 与x 之间的函数表达式，并直接写出x 的取值范围；(2)设人的身高为h ，当单肩包的背带长度调整为最佳背带总长度时，求此时人的身高h 与这款单肩包背带的双层部分的长度x 之间的函数表达式；(3)当小明爸爸的单肩包的背带长度调整为最佳背带总长度时，求此时双层部分的长度． 24．已知抛物线23y ax bx =++的顶点坐标为()1,4-，与x 轴交于点A 和点B ，与y 轴交于点C ，点P 为第二象限内抛物线上的动点．(1)求抛物线的解析式；(2)如图1，连接OP 交BC 于点D ，当:1:2CPD BPD S S =△△时，请求出点D 的坐标；(3)如图2，点E 的坐标为()01-，，点G 为x 轴负半轴上的一点，15OGE ∠=︒，连接PE ，若2PEG OGE ∠=∠，请求出点P 的坐标； 25．综合探究如图，在矩形ABCD 中，5AB =，8BC =，点E 是射线BC 上的动点，连接AE ，将ABE V 沿AE 折叠，点B 落在点F 处，连接CF ，DF ．(1)当点E 是BC 的中点时，求证：AE CF P ；(2)若AF DF =，求BE 的长；(3)当ADF ∠的度数最大时，求ADF △的面积．。
广东省佛山市桂城中学2020-2021学年高二下学期第一次段考数学试卷(无答案)
桂城中学2020-2021学年第二学期高二级第一次段考数学试卷一、单项选择（本大题共8小题，每小题5分，共40分） 1. 下列求导结果正确的是（ ） A. ()'2112xx -=- B. ()'o o cos30sin 30=-C. ()'1ln 22x x =⎡⎤⎣⎦D.'=2. 已知函数()y f x =的导函数()'y f x =的图像如图所示，则函数()y f x =在区间(),a b 内的极小值点的个数为（ ）A. 1B. 2C. 3D. 43. 已知l ，m 是两条不同的直线，α是平面，且m α∥，则（ ） A. 若l m ∥，则l α∥ B. 若l α∥，则l m ∥ C. 若l m ⊥，则l α⊥ D.l α⊥ 若，则l m ⊥4. 已知函数()()2x f x x a e =-，则“1a ≥-”是“()f x 有极值”的（ ）A. 充分不必要条件B. 必要不充分条件C. 充要条件D. 既不充分也不必要条件5. 已知()1,0F c -，()2,0F c 分别为双曲线22122:1x y C a b-=（0a >，0b >）的两个焦点，双曲线1C 和椭圆2222:C x y c +=的一个交点为P ，且21=3PF F π∠，那么双曲线1C 的离心率为（ ） A.B. C. 2D.16. 设动直线x m =与函数()2f x x =，()2lng x x =的图像分别交于M 、N ，则MN 的最小值为（ ） A.12B. 1C. 1ln2+D. 1ln2- 7. 已知函数()ln 1f x x ax =--有两个零点，则实数a 的取值范围是（ ） A. 21,e ⎛⎫-∞ ⎪⎝⎭ B. 210,e ⎛⎫⎪⎝⎭ C. 1,e ⎛⎫-∞ ⎪⎝⎭ D.10,e ⎛⎫⎪⎝⎭8. 已知函数()xe f x ax x =-，()0,x ∈+∞，当21x x >时，不等式()()1221f x f x x x <恒成立，则实数a 的取值范围为（ ）A. (],e -∞B. (),e -∞C. ,2e ⎛⎫-∞ ⎪⎝⎭ D. ,2e ⎛⎤-∞ ⎥⎝⎦ 二、多项选择题（本题共4小题，每小题5分，共20分）9. 已知复数1z =-+（i 为虚数单位），z 为z 的共轭复数，若复数zw z=，则下列结论正确的有（ ）A. w 在复平面内对应的点位于第二象限B. 1w =C. w 的实部为12D. w 的虚部为210. 如图是棱长为1的正方体的平面展开图，则在这个正方体中，以下结论正确的有（ ）A. 点M 到ABB. AB 与EF 所成的角是o90 C. 三棱锥C DNE -的体积是16D. EF 与MC 是异面直线11. 设抛物线()220y px p =>的焦点为F ，点M 在y 轴上，若线段FM 的中点B 在抛物线上，且点B 到抛物线准线的距离为4，则点M 的坐标为（ ） A. ()0,1- B. ()0,2- C. ()0,2 D. ()0,1 12. 已知()f x 是定义在R 上的函数，()'f x 是()f x 的导函数，给出如下四个结论，其中正确的是（ ） A. 若()12f -=，且()'2f x >，则()24f x x >+的解集为()1,-+∞B. 若()()'0f x fx x+>，且()0f e =，则函数()xf x 有极小值0C. 若()()'0f x f x +>，且()01f =，则不等式()1ef x <的解集为()0,+∞D. 若()()'0f x f x ->，则()()20202019f f e> 三、填空题（本大题共4小题，每小题5分，其中第16题第一空2分，第二空3分，共20分）13. 已知复数z 满足()14z i -=（i 为虚数单位），则z = .14. 已知圆C 经过点()1,2A -，()3,0B -，且圆心C 在直线10x y -+=上，则该院的标准方程为 .15. 已知函数()2ln 3mf x x x x x=+-+，若函数()f x 在[]1,2上单调递减，则实数m 的最小值为 .16. 对于三次函数()()320f x ax bx cx d a =+++≠，给出定义：设()'fx 是函数()y f x =的导数，()''fx 是函数()'f x 的导数，若方程()''0f x =有实数解0x ，则称点()()00,x f x 为函数()y f x =的“拐点”. 某同学经过探究发现：任何一个三次函数都有“拐点”；任何一个三次函数都有对称中心，且“拐点”就是对称中心. 若()3211533212f x x x x =-+-，则函数()f x 的对称中心为 ，12320202021202120212021f f f f ⎛⎫⎛⎫⎛⎫⎛⎫+++⋅⋅⋅+=⎪ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭⎝⎭.四、解答题（本大题共6小题，共70分） 17. 已知函数()3f x x =.（1）求曲线()y f x =在点()1,1A --处的切线方程； （2）求曲线()y f x =过点()2,0B 的切线方程.18. 函数()ln f x x ax =-. （1）讨论()f x 的极值；（2）若()f x 有最大值M ，且M a ≤-恒成立，求a 的值.19. 如图，三棱柱111ABC A B C -中，AB ⊥侧面11BB C C ，已知1=3BCC π∠，1BC =，12AB C C ==，点E 是棱1CC 的中点.（1）求证：BC ⊥平面1ABC ； （2）求二面角11A B E A --的余弦值.20. 设椭圆中心在原点O ，焦点在x 轴上，离心率为2，椭圆上一点P 到两焦点的距离之.（1）求椭圆方程；（2）若直线0x y m ++=交椭圆于A 、B 两点，且OA ⊥OB ，求实数m 的值.21. 已知函数()()211ln 2f x x a x a x =-++. （1）当0a <时，求函数()f x 的单调区间；（2）若函数()()()22ln 12xg x e a x a x f x =-++--，若()g x 在[]1,2内有且仅有一个零点，求实数a 的取值范围.22. 已知函数()()x f x e ax a R -=+∈.（1）讨论()f x 的最值； （2）若0a =，求证：()21528f x x >+.。
2020-2021学年佛山市南海区桂城中学高三英语下学期期中试卷及答案解析
2020-2021学年佛山市南海区桂城中学高三英语下学期期中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AShopping centers，stadiums and universities may soon have a new tool to help fight crime.ACaliforniacompany called Knightscope says its robots can predict and prevent crime. Knightscope says the goal is to reduce crime by half in areas the robots guard.William Santana Li is the chief executive officer of Knightscope. He says，"These robot security guards will change the world. Our planet has more than seven billion people on it. It's going to quickly get to nine billion people. The security equipmentthat we have globally is just not going to develop that fast. The company's Autonomous Data Machines can become the eyes and ears of law enforcement（执法）.""You want them to be machines plus humans. Let. the machines do the heavy and sometimes dangerous work and let the humans do the strategic decision-making work，so it's always working all together."The machines do not carry weapons but they have day and night video cameras which are able to turn 360 degrees and can also sense chemical and biological weapons.Some people may become concerned about their privacy, especially in connection with the video recordings. Some people may worry that such recordings will appear on the Internet. Eugene Volokh, a law professor at the UCLA School of Law, says the machines have to be used in the right way and it will be interesting to see how state laws deal with this kind of video.William Santana Li says there is a long waiting list for the robots in theUS. Workers in the company are working overtime to meet the demands of the market. At least 25 other countries are also interested in these robot security guards.1. What can this new tool do for humans?A. Make strategic decisions.B. Keep watching day and night.C. Carry heavy weapons.D. Stop crime autonomously.2. Why are some people worried about the new robots?A. Their privacy may be let out.B. The robots are very expensive.C. Robots will replace humans.D. They will be out of work soon.3. Which of the following can be the best title of the text?A. Robots Are Becoming More PopularB. Robots Contribute aLotto the WorldC. Robots Are in Great Demand NowD. Security Robots Could Help Cut CrimeBWhen visitors enter Planet Word, a new museum in Washington, D. C , they will see Speaking Willow, a tall art piece representing a tree. As they pass under the artwork, they can hear recordings of speech in hundreds of languages coming from the tree. Most words sound foreign to the listeners. The different voices also speak at the same time. The resultingclamoris similar to that made in a crowded theater before a show begins.Rafael Lozano-Hemmer completed the piece last year. On his website, the artist says that Speaking Willow “reminds us that language is what defines our specific communities and connects our many cultures.” Lozano-Hemmer made the piece specially for the museum.It is the first of many immersive (身临其境的) experiences for visitors at Planet Word, a museum all about words and language. The exhibits playfully explore the lager and complex subject of language.In one room, a video plays, showing babies saying their first words. Another room, called “Where Do Words Come From”, teaches the history of some common English words. The space includes a 22-foot-tali “Wall of Words”, where visitors speak into devices and learn about the roots of the English language.Another room invites listeners to speak and learn about different languages. Native speakers of 28 languages and two sign languages teach people sayings in those languages. They also explain how language shapes their understanding of the world and how words cannot be separated from culture.Other rooms explore the different ways language is used — from humor and song writing to public speaking and advertising. Visitors can sing karaoke while learning about song writing, record a famous speech, play a joke-telling game, and teach a computer how to make cartoons. Almost every exhibit is interactive and most ask visitors to speak aloud.One exhibit room is all about books. It is designed to look like an old, rich library. Books line the shelves.When a book is placed on the table, a recorded reading begins and pictures appear.4. What does the underlined word “clamor” in paragraph 1 probably mean?A. Scene.B. Noise.C. Language.D. Appearance.5. The SpeakingWillowwas created ______.A specially B. accidentallyC. on requestD. out of curiosity6. What can we learn from the video in the room?A. Words and cultures.B. Different languages.C. The history of words.D. The first words newborns say.7. In which paragraph can you find the methods of using languages?A. 3.B. 4.C. 6.D. 7.CThere is nothing ordinary about this little boy's adorable experience with his musical heroes.5-year-old Taylor Hooper was just one of the 35,0000people who were attending the Foo Fighters concert in Belfast, Norther Ireland last week. Not only is the American rock group his favorite band, it was also his first ever concert.Taylor's mother, Nikki Hooper, says that she and her husband have always been huge fans of the Foo Fighters. In addition to traveling far and wide to see their shows, they even named their son after the drummer, Taylor Hawkins. So when the band played in their home city, they decided it was finally time for their son to see their beloved rock and rockers in concert.“He's been listening to them since he was born — mainly because his dad and I are super fans.” Mrs Hooper told BBC. “We called the event organizers and they said it would be no problem, but that we should know it would be a loud music event, so we gotTaylorsome special headphones. When we got there everyone was so welcoming to him.”Throughout the show, the audience continuously madeTaylorand his parents move closer to the stage. Furthermore, Mrs. Hooper helped her son stand out from the crowd by making him a sign that said he was a 5-year-old attending his first concert.When Foo Fighters front man Dave Grohl finally saw the sign and read it aloud into the microphone, the crowd began chanting for them to bring the youngster onto the stage. That's exactly what he did. When the stagemanagers brought the boy to the stage, Grohl asked Taylor to show the crowd how to dance．The small boy then danced to the whole song, making him an “Inter net wonder”.Taylordidn't just walk away from the show with memories, either;the band also invited him backstage to give him a number of gifts, includinga pair of Taylor Hawkins's drumsticks.8. What is Foo Fighters in the passage?A. I's a music show.B. It's a music band.C. It's a pop song.D. It's a music fan.9. We can learn from Paragraph 3 that_______．A. the organizers refused to let the child watch the showB. there was nothing wrong for the child to watch the showC. the organizers suggested the kid take care of the loud noiseD. the child felt so scared that he didn't want to go to the stage10. How did 5-year-old Taylor Hooper cause people's attention?A. By shouting loudly.B. By running to the singers.C. By holding a sign showing his age.D. By dancing to the whole song.11. How didTaylorfeel about his first ever concert?A. Worried.B. Scared.C. Sorry.D. Pleased.DShanghairesidents passing through the city’s eastern Huangpu district in Octobermight have astonished at an unusual sight: a “walking” building. An 85-year-old primary school has been lifted off the ground in its entirety and relocated using new technology named the “walking” machine.In the city’s latest effort to preserve historic structures, engineers used nearly 200 mobile supports under the five-story building. The supports act like robotic legs. They’re split into two groups which in turns rise up and down, imitating the human step. Attached sensors help control how the building moves forward.TheLagenaPrimary School, which weighs 7,600 tons, faced a new challenge — it’s T-shaped, while previously relocated structures were square or rectangular. Experts and technicians met to discuss possibilities and test a number of different technologies before deciding on the “walking machine”.Over the course of 18 days, the building was rotated 21degrees and moved 62 meters away to its new location. The old school building is set to become a center for heritage protection and cultural protection. The project marks the first time this “walking machine” method has been used inShanghaito relocate a historicalbuilding.In recent years,China’s rapid modernization has seen many historic buildingsrazedto clear land for skyscrapers and office buildings. But there has been growing concern about the architectural heritage loss as a result of destruction across the country.Shanghaihas beenChina’s most progressive city when it comes to heritage preservation. The survival of a number of 1930s buildings in the famous Bund district and 19th-century “Shikumen” houses in the repaired Xintiandi neighborhood has offered examples of how to give old buildings new life. The city also has a track record of relocating old buildings. In 2018, the city relocated a 90-year-old building in Hongkou district, which was then considered to beShanghai’s most complex relocation project to date.12. How did the primary school get moved?A. By reducing the weight of it.B. By using movable supports.C. By dividing it into several parts.D. By using robotic legs.13. What does the underlined word “razed” probably mean in Paragraph 5?A. Replaced.B. Burnt.C. Protected.D. Destroyed.14. What can we infer about the heritage preservation inChina?A. The use of advanced technology leads to growing concern.B. Shanghai is the pioneer in preserving architectural heritage.C.A number of old buildings have been given new life.D. Many historic buildings will be relocated.15. What is the passage mainly about?A. New preservation campaigns are launched inChina.B. New technology gives new life to historic buildings.C. A building inShanghai“walks” to a new location.D. “Walking machine” makes heritage protection simpler.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。
2020-2021学年南海区桂城中学高三生物下学期期中试题及参考答案
2020-2021学年南海区桂城中学高三生物下学期期中试题及参考答案一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 某研究人员对玉米组织、小白鼠组织、T2噬菌体（DNA病毒）、乳酸菌、酵母菌等样品进行化学成分分析。
以下分析结果正确的是（）A. 含有水、DNA、RNA、糖原、蛋白质等成分的样品是小白鼠组织B. 只含有蛋白质和DNA成分的样品是乳酸菌C. 含有水、DNA、RNA、蛋白质、纤维素等成分的样品是玉米组织和乳酸菌D. 既有DNA，又有RNA的只有玉米组织、小白鼠组织2. 下列关于“引来繁花缀满枝，瓜熟蒂落也有时”现象的分析，错误的是( )A. 这一现象是多种植物激素相互作用的结果B. 环境因子只能通过激素来影响植物的各项生命活动C. 乙烯和脱落酸协同调节了“瓜熟蒂落”的过程D. 适当喷2,4－D能延长“繁花缀满枝”的时间3. 关于人体细胞以葡萄糖为底物进行的细胞呼吸过程的叙述，错误的是（）A. 细胞有氧呼吸和无氧呼吸都可产生[H]B. 细胞呼吸作用释放的能量只有一部分储存在A TP中C. 机体在剧烈运动时可通直接分解糖元释放部分能量D. 若细胞呼吸消耗的O2量等于生成的CO2量，则细胞只进行有氧呼吸4. 给奶牛挤奶时其乳头上的感受器会受到刺激，产生的兴奋沿着传入神经传到脊髓能反射性地引起乳腺排乳；同时该兴奋还能上传到下丘脑，促使其合成催产素，进而促进乳腺排乳。
下列相关叙述不正确的是（）A.神经元之间的信息传递是通过突触来完成的B.上述过程的完成需要“不完全自主”的自主神经系统参与C.上述两种排乳，前者为非条件反射，后者为条件反射D.兴奋在突触小体内完成的信号转化是由电信号转化为化学信号5. T细胞主要包括抑制性T细胞（Ts）、辅助性T细胞（Th）和细胞毒性T细胞（Tc）。
Tc能杀伤被病毒感染的细胞，Th能通过分泌细胞因子促进B细胞分化并提高Tc的杀伤力，Ts能抑制Th的活性。
2020-2021学年南海区桂城中学高三英语下学期期中试题及答案
2020-2021学年南海区桂城中学高三英语下学期期中试题及答案第一部分阅读（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ASome colleges have started offering their own gap year programs to support students who want to take a year off in a meaningful way. Below, we’ll look at four of these programs.American University Gap ProgramWhen to apply: By July 15 or November 15Is there funding available? No.In American University Gap Program, students spend three days per week with a government or business organization in the city. Students go on field trips, listen to guest speakers, take part in hands-on lessons and work on service projects as a group. Students who complete the program can earn seven credits.Duke University Gap Year ProgramWhen to apply: By early May of each yearIs there funding available? Yes, $5,000 to $15,000.Though Duke University has no course of study or experience for its gap year program, it encourages students to have an independent plan for their year off, particularly one that promotes personal growth. Independent experiences may include community service, personalized experiential learning opportunities and others.Florida State University Gap YearWhen to apply: By February 24Is there funding available? Yes, up to $5,000.Florida State University offers gap year funding to students wishing to work or volunteer before starting college. In order to get the momey, students must explain their plans for their gap year. The experience must last over one year.St Norbert College Bridge Year ExperienceWhen to apply: not specifiedIs there funding available? Not specified.Students taking part in the Bridge Year Experience can travel to locations such as New Mexico, Wisconsin and Guatemala during the fall term, where they learn about the local cultures, take courses and get serviceopportunities.1.What does Duke University advise students to do during their gap year?A.Focus on their personal growth.B.Be independent of their parents.C.Apply before the end of November.D.Contact some off-campus organization.2.How can students get gap year funding from Florida State University?A.By having extra credits.B.By organizing several projects.C.By showing their gap plans.D.By doing volunteer work.3.If you are interested in travelling, you can choose ________.A.Florida State University Gap YearB.American University Gap ProgramC.Duke University Gap Year ProgramD.St. Norbert College Bridge Year ExperienceBIvy League schools are considered to be the most prestigious of all colleges in the United States. These schools are primarily located in the Northeastern part of the country. There are eight total colleges that are considered to be Ivy League. These schools are Brown, Harvard, Cornell, Princeton, Dartmouth, Yale, and Columbia universities and the University of Pennsylvania. Of all institutions of higher learning, these elite schools are considered to be the most outstanding and the most sought-after in terms of acceptance and graduation.The term “Ivy League” came about in 1954 when the NCAA athletic conference for Division I was formed. At the time, the elitism of these schools was really due to their prestige in the realm of sports like basketball. Although the term “Ivy League” was not created until the 1950s, many of these schools were in existence as far back as 1636, when John Harvard became the first benefactor of Harvard University.Although this group of elite schools is considered to be part of one big league of the elite, there have been plenty of internal rivalries over the years. The sports that these colleges play were so popular that some teams began playing games in New York City so spectators could come from far away and watch the games. The popularity of both the athletes who played and the college team rivalries brought in a good deal of attention to the schools as well as revenue from ticket sales. There have also been academic rivalries between schools. Mostly, these rivalries are a matter of opinion in terms of which school has the most honor graduates, which schools offer the most prestigious scholarships, and what famous graduates have come from each school.Each Ivy League college has its own unique accomplishments that make it important. All carry a certainreputation with them, and each school has programs that excel primarily in the medical and law fields, making them some of the most sought-after schools in the world. Their admission process is very selective, which helps the schools ensure that they only accept the best and brightest. Many famous people have graduated from Ivy League schools, including recent presidents George W. Bush, Bill Clinton, and Barack Obama. This prestige leads many to believe that these colleges are only for the wealthy and elite. Often, companies look for Ivy League graduates as potential employees, usually preferred by law firms, medical facilities, and large corporations. It has long beencovetedto have earned a degree from an Ivy League school. Today, the Ivy League schools are still excellent in both academia and in sports, and they have left a legacy of higher education with an exceptional track record and reputation to go along with them.4. Which of the following statements is true according to the passage?A. Ivy League schools were initially famous for their reputation in sports.B. Ivy League schools didn’t come into existence until the 1950s.C. Ivy League schools do not compete with each other within the league.D. Ivy League schools are most popular for their excellence in the medical and law fields.5. Which of the following aspects is NOT mentioned in the passage?A. The history of the Ivy LeagueB. The rivalry of the Ivy LeagueC. The accomplishments and cultural impacts of the Ivy LeagueD. The future development of the Ivy League6. Why do many people believe that Ivy League colleges are only for the wealthy and elite?A. Because they are the most sought-after schools in the world.B. Because they have selective admission process to help ensure the quality of their students.C. Because many famous people have graduated from Ivy League schools.D. Because manycompanies look for Ivy League graduates as potential employees.7. What does the underlined word “coveted” in the last paragraph probably mean?A. advocatedB.DesiredC. restrictedD. sponsoredCThe world's largest iceberg is floating toward South Georgia in the southernAtlantic Ocean. Scientists fear the iceberg could crash into the island and block major feeding areas for a large population of penguins and seals. Ifthe iceberg hits the island, it could prevent the penguins and seals from reaching food supplies.The huge iceberg is named A68a. It broke away fromAntarctica's Larsen C Ice Shelf in 2017. Satellite images show the iceberg has remained in one piece. It is estimated to be about 150 kilometers long and 48 kilometers wide. It is traveling at one kilometer per hour and is on a path to hitSouth Georgiain around 30 days.This is the time of year when seals and penguins spend a lot of time caring for their young. The distance that parents have to travel to find food is crucial. That means they have to go a lot further or go around the iceberg to find sources of food.Ecologists say an iceberg crash would also disturb materials settled on the seabed, possibly polluting the surrounding seas. As the iceberg melts, it would also release large amounts of fresh water into the ocean. This could affect krill（磷虾）populations that are a major source of food for the island's wildlife. The iceberg could remain for up to 10 years and change the area's whole ecosystem. These are globally significant populations of these species. If these species fail in this particular area, then the numbers globally are going to go down quite dramatically.Professor Geraint Tarling, an ecologist at the British Antarctic Survey, said, "The breaking off of icebergs fromAntarcticais a natural process. But the process is changing with climate change. What we're seeing with models and some observations now is that this is happening at an increasing rate. And so, this might become more of a usual thing in the future."8. Why are the scientists worried about the coming iceberg crash?A. It will bring extremely cold weather.B. It will destroy the feeding areas of the animals.C. It will put wildlife on the island at risk of starving.D. It will prevent animals from moving to other places.9. What is paragraph 2 mainly about?A. The characteristic of the iceberg.B. The importance of the iceberg.C. The traveling speed of the iceberg.D. The forming process of the iceberg.10. What damage can an iceberg crash bring according to paragraph 4?A. Using up much fresh water.B. Polluting the surrounding farms.C. Changing the world's ecosystem.D. Affecting the number of certain species.11. How does Tarling think of the breaking off of icebergs fromAntarctica?A. It may slow down in the near future.B. It may become common in the future.C. It has a great influence on the climate.D. It helps scientists conduct a sea study.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 a professional 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。
广东省佛山市桂城中学2020-2021学年高二下学期第二次段考数学试题
桂城中学2020-2021学年度下学期高二级第二次段考数学试卷一、单项选择题：本题共8小题，每小题5分，共40分.1. 已知z 为复数，若()12z i i ⋅-=（i 是虚数单位），则z =（ ）A. 1B.C.12 D. 2. 4本相同的数学书和3本不同的语文书分给7个人，每人1本，共有不同分法种数为（ ）A. 47CB. 77AC. 47AD. 37A3. 已知函数()f x 是奇函数，当0x ≥时，()ln 1f x x x =+，则曲线()y f x =在1x =-处的切线方程为（ ）A. y x =-B. 2y x =-+C. y x =D. 2y x =- 4. 某小区有1000户，各户每月的用电量近似服从正态分布()2300,5N ，则用电量在310度以上的用户数约为（ ）参考数据：若随机变量ξ服从正态分布()2,N μσ，则()68.26%P μσξμσ-≤≤+=，()2295.44%P μσξμσ-≤≤+=，()3399.74%P μσξμσ-≤≤+=.A. 17B. 23C. 34D. 465. 体育课的排球发球项目考试的规则是每名学生最多可发球3次，一旦发球成功，则停止发球，否则一直发到3次为止. 设学生一次发球成功的概率为()0p p ≠，发球次数为X ，若X 的均值()139E X >，则p 的取值范围是（ ）A. 20,3⎛⎫ ⎪⎝⎭B. 2,13⎛⎫ ⎪⎝⎭C. 130,27⎛⎫⎪⎝⎭ D. 13,127⎛⎫ ⎪⎝⎭6. 在511x x ⎛⎫++ ⎪⎝⎭的展开式中，2x 项的系数为（ ）A. -50B. -30C. 30D. 507. 某校学生会为了调查学生对2022年北京冬奥会的关注是否与性别有关，抽样调查了100人，得到如下数据.根据表中数据，通过计算统计量()()()()()22n ad bc K a b c d a c b d -=++++，并参考以下临界数值：若由此认为“学生对2022年北京冬奥会的关注与性别有关”，则此结论出错的概率不超过（ ） A. 0.10 B. 0.05 C. 0.025 D. 0.010 8. 某班组织由甲、乙、丙等5名同学参加的演讲比赛，现采用抽签法决定演讲顺序，在“学生甲不是第一个出场，学生乙不是最后一个出场”的前提下，学生丙第二个出场的概率为（ ） A.739 B. 239 C. 313 D. 513二、多项选择题：本题共4小题，每小题满分5分，共20分.9. 已知2nax⎛+ ⎝()0a >的展开式中第5项与第7项的二项式系数相等，且展开式的各项系数之和为1024，则下列说法正确的是（ ）A. 展开式中计数项的二项式系数和为256B. 展开式中第6项的系数最大C. 展开式中存在常数项D. 展开式中含15x 项的系数为45 10. 已知由样本数据点集合(){},,1,2,,iix y i n =⋅⋅⋅，求得回归直线方程为^1.50.5y x =+，且3x =，现发现两个数据点()1.2,2.2和()4.8,7.8误差较大，去除后重新求得的回归直线l 的斜率为1.2，则（ ） A. 变量x 与y 具有正相关关系 B. 去除后的回归方程为^1.2 1.4y x =+C. 去除后y 的估计值增加速度变快D. 去除后相应与样本点()2,3.75的残差为0.0511. 某医院派出甲、乙、丙、丁4名医生到A ，B ，C 三家企业开展“新冠肺炎”防护排查工作，每名医生只能到一家企业工作，则下列结论正确的是（ ）A. 若C 企业最多派1名医生，则所有不同分派方案共48种B. 若每家企业至少分派1名医生，则所有不同分派方案共36中C. 若每家企业至少分派1名医生，且医生甲必须到A 企业，则所有不同分派方案共12种D. 所有不同分派方案共34种 12. 关于函数()2ln f x x x=+，下列判断正确的是（ ） A. 2x =是()f x 的极大值点B. 函数()y f x x =-有且只有1个零点C. 存在正实数k ，使得()f x kx >成立D. 对任意两个正实数1x ，2x ，且12x x >，若()()12f x f x =，则124x x +>三、填空题：本题共4小题，每小题5分，共20分13. 函数()ln f x x ax =-在区间()1,5上是增函数，则实数a 的取值范围是. 14. 已知复数z 与()228z i ++均是纯虚数，则z 的虚部是.15. 某次足球比赛中，A ，B ，C ，D 四支球队进入了半决赛. 半决赛中，A 对阵C ，B 对阵D ，获胜的两队组别 A B C D A 获胜的概率 — 0.4 0.3 0.8 B 获胜的概率 0.6 — 0.7 0.4 C 获胜的概率 0.7 0.3 — 0.3 D 获胜的概率0.20.60.7—则A 队获得冠军的概率为.16. 已知一个口袋中装有n 个红球（1n ≥且*n N ∈）和2个白球，从中有放回地连续摸三次，每次摸出两个球，若两个球的颜色不同则为中奖，否则不中奖. 记三次摸球（每次摸球后放回）恰有两次中奖的概率为P ，则P 的最大值为，此时n 为. 四、解答题：共70分.年份 2014 2015 2016 2017 2018 2019 2020 年份代号t 1 2 3 4 5 6 7 年纯收入y233.544.556（1）求y 关于t 的线性回归方程；（2）利用（1）中的回归方程，分析2014年至2020年该地区农村居民家庭年纯收入的变化情况，并预测该地区2021年农村居民家庭年纯收入（结果精确到0.1）. 附：回归直线的斜率和截距的最小二乘法估计公式分别为18. 已知函数()2ln f x x ax bx =+-.（1）若函数()f x 在2x =处取得极值1ln 22-，求a ，b 的值； （2）当18a =-时，函数()()g x f x bxb =++在区间[]1,3上的最小值为1，求()g x 在该区间上的最大值.19. 某工厂生产的A 产品按每盒10件包装，每盒产品需检验合格后方可出厂，检验方案是：从每盒10件产品中任取4件，4件都做检验，若4件都为合格品，则认为该盒产品合格且其余产品不再检验；若4件中次品多于1件，则认为该盒产品不合格且其余产品不再检验；若4件中只有1件次品，则把剩余的6件采用一件一件抽取出来检验，没有检验出次品则认为该盒产品合格，检验出次品则认为该盒产品不合格且停止生产.假设某盒A 产品中有8件合格品，2件次品. （1）求该盒A 产品可出产的概率；（2）已知每件产品的检验费用为10元，且抽取的每件都需要检验，设该盒A 产品的检验费用为X （单位：元）.①求P （X =40）；②求X 的分布列和数学期望E （X ）.20. 山东省2020年高考实施新的高考改革方案，考生的高考总成绩由3门统一高考科目成绩和自主选择的3门普通高中学业水平等级考试科目成绩组成，总分为750分. 其中，统一高考科目为语文、数学、外语，自主选择的3门普通高中学业水平等级考试科目是从物理、化学、生物、历史、政治、地理6科中选择3门作为选考科目，语、数、外三科各占150分，选考科目成绩采用“赋分制”，即原始分数不直接用，而是按照学生分数在本科目考试的排名来划分等级并以此打分得到最后得分. 根据高考综合改革方案，将没门等级考试科目中考生的原始成绩从高到低分为A 、B +、B 、C +、C 、D +、D 、E 共8个等级.参照正态分布原则，确定各等级人数所占比例分别为3%，7%，16%，24%，24%，16%，7%，3%. 等级考试科目成绩计入考生总成绩时，将A 至E 等级内的考生原始成绩，依照等比例转换法则，分别转换到91-100、81-90、71-80、61-70、51-60、41-50、31-40、21-30八个分数区间，得到考生的等级成绩.举例说明：某同学化学学科原始成绩分为65分，该学科C+等级的原始分分布区间为58~69，则该同学化学学科的原始成绩属C +等级，而C +等级的转换分区间为61~70，那么该同学化学学科的转换分为：设该同学化学学科的转换等级分为x ，696570655861xx --=--，求得66.73x ≈，四舍五入后该同学化学学科赋分成绩为67.（1）某校高一年级共2000人，为给高一学生合理选科提供依据，对六个选考科目进行测试，其中物理考试原始成绩基本服从正态分布()260,12N ξ.①若小明同学在这次考试中物理原始分为84分，等级为B +，其所在原始分分布区间为82~93，求小明转换后的物理成绩（结果四舍五入取整数）； ②求物理原始分在区间（72,84）的人数；（2）按高考改革方案，若从全省考生中随机抽取4人，记X 表示这4人中等级成绩在区间[]61,80的人数，求X 的分布列和数学期望.附：随机变量ξ服从正态分布()2,N μσ，则()0.682P μσξμσ-≤≤+=，()220.954P μσξμσ-≤≤+=，()330.997P μσξμσ-≤≤+=.21. 某基地蔬菜大棚采用水培、无土栽培方式种植各类蔬菜，过去50周的资料显示，该地周光照量X （小时）都在30小时以上，其中不足50小时的周数有5周，不低于50小时且不超过70小时的周数有35周，超过70小时的周数有10周. 根据统计，该基地的西红柿增加量y （百斤）与使用某种液体肥料x （千克）之间对应数据为如图所示的折线图.（1）依据数据的折线图，是否可用线性回归模型拟合y 与x 的关系？请计算相关系数r 并加以说明（精确到0.01）. （若0.75r >，则线性相关程度很高，可用线性回归模型拟合）（2）蔬菜大棚对光照要求较大，某光照控制仪商家为该基地提供了部分光照控制仪，但每周光照控制仪最多可运行台数受周光照量X 限制，并有如下关系：若某台光照控制仪运行，则该台光照控制仪周利润为3000元；若某台光照控制仪未运行，则该台光照控制仪周亏损1000元. 以过去50周的周光照量的频率作为周光照量发生的概率，商家欲使周总利润的均值达到最大，应安装光照控制仪多少台？22. 已知函数()()ln 0b f x a x x a =+≠.（1）当2b =时，若函数()f x 恰有一个零点，求实数a 的取值范围；（2）当0a b +=，0b >时，对任意121,,x x e e ⎡⎤∈⎢⎥⎣⎦，有()()122f x f x e -≤-成立，求实数b 的取值范围.。