201年栖霞区二模考

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南京市栖霞区2021年中考二模语文试卷及答案

栖霞区九年级中考模拟测试卷（二）语文注意事项：1.本试卷8页，共120分。

考试时间为120分钟。

2.考生答题全部答在答题卡上，答在本试卷上无效。

3.答选择题必须用2B铅笔将答题卡上对应的答案标号涂黑。

如需改动，请用橡皮擦干净后，再选涂其他答案。

答非选择题必须用0.5毫米黑色墨水签字笔写在答题卡的指定位置，在其他位置答题一律无效。

一（22分）1.请从下面两幅字中任选一幅临写。

（3分）长风煮酒无人和清风明月寄相思2.用诗文原句填空。

（6分）①天时不如地利，▲。

（《得道多助，失道寡助》）②春蚕到死丝方尽，▲。

（李商隐《无题》）③竹杖芒鞋轻胜马，谁怕？▲。

（苏轼《定风波》）④山重水复疑无路，▲。

（陆游《游山西村》）⑤“思”是文学中经典而永恒的话题之一，我们中小学也学过很多含有“思”字的古诗词，请写出任意两句。

▲▲3.根据语境完成任务。

（10分）2021年是“南京戏剧节”举办的第五年。

这五年以来，南京戏剧节一直秉承着成为“爱南京的新理由”这一理念，将品质佳作引进剧场，将妙趣横生的戏剧活动带进城市，记载．戏剧在这座城市的流淌痕迹，打造“文学之都”的zhǎn新文化标识。

戏剧节对传承南京城市文脉、赋予南京文艺能量、扩大南京城市文化影响力具有积极意义。

今年的戏剧节，除常规的剧目演出外，主办方还将以丰富多样的戏剧线下活动为载．体，打破剧场壁垒，让戏剧和观众们更好的接触rónɡ合。

热爱戏剧的你还不快快来关注这届彩蛋满满的“2021·南京戏剧节”！（1）根据拼音写汉字：zhǎn（▲）新 rónɡ（▲）合（2分）（2）给加点字注音：记载．（▲）载．（▲）体（2分）（3）小夏想把文中画横线的两个句子中的一个稍加修改，使前后两个句子结构一致、文气贯通。

你将需要修改的句子修改好，写在下面的横线上。

（2分）▲（4）小琪找到了“2021南京戏剧节”的徽标，请你帮她解析该徽标图案设计的巧妙之处。

（4分）▲（注：图案中所有线条为蓝色）4.学校的戏剧社团开始准备招收新成员。

初中化学南京市栖霞区中考二模化学考试卷及答案.doc

初中化学南京市栖霞区中考二模化学考试卷及答案姓名:_____________ 年级:____________ 学号:______________题型选择题填空题简答题xx题xx题xx题总分得分一、选择题（共17题）1.下列实验属于物理变化的是Ａ．电解水B．自制叶脉书签C．自制汽水D．保鲜膜保鲜能力测试【答案】D难度：容易知识点：常见的酸和碱2.《中国药典》明确规定，药用胶囊以及使用的明胶原料，重金属铬的含量均不得超过2mg/kg。

有毒胶囊的重金属铬的实际含量严重超标。

这里的“铬”是指A. 原子B. 元素C. 分子D. 单质【答案】B难度：基础知识点：元素3.下列物质中，属于纯净物的是A．空气B．海水C．生铁D．冰水共存物【答案】D难度：容易知识点：空气4.被蚊虫叮咬后，涂些含有碱性物质(如NH3·H2O)的药水，可减轻痛痒。

NH3中的N元素的化合价为A.-3B.0C. +3D.+5【答案】A难度：容易知识点：化学式与化合价5.下列图示实验操作中，错误的是评卷人得分A.加热液体B.读取液体体积C.稀释浓硫酸D.点燃酒精灯【答案】C难度：基础知识点：走进化学实验室6.老李发现自家的农田出现土壤酸化板结现象，经查阅资料得知：是因为该农田长期施用化肥硫酸铵[(NH4)2SO4]的缘故。

硫酸铵属于A．氮肥B．磷肥C．钾肥D．复合肥【答案】A难度：基础知识点：化学肥料7.下列粒子结构示意图中，表示阴离子的是【答案】A难度：容易知识点：离子8.下列各组物质在水溶液中能够共存，而且加入酚酞显红色的是A. NaOH 、CuSO4 、H2SO4B. NaCl 、Na2SO4、 NaOHC. NaCl 、NaNO3、 HClD. NH4NO3 、NaOH 、H2SO4【答案】B难度：容易知识点：生活中常见的盐9.下列说法中，错误的是A．洗涤剂可乳化餐具上的油污B．用灼烧法鉴别棉纤维和羊毛纤维C．氢氧化钠溶液可直接用作厨房清洁剂D．长期用硬水洗涤的衣物会变硬【答案】C难度：容易知识点：酸和碱之间会发生什么反应10.根据如图所示的实验现象，下列判断错误的是（）A．①②说明物质燃烧需要氧气B．①说明白磷的着火点不高于80℃C．烧杯中的热水只起提高温度的作用D．①③说明两种可燃物的着火点不同【答案】C难度：中等知识点：燃烧和灭火11.右图是某河流一年中不同时期河水的平均pH变化的折线图。

2020-2021学年栖霞市实验中学高三英语二模试题及答案

2020-2021学年栖霞市实验中学高三英语二模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AYou haven’t truly visited a city until you’ve experienced its nightlife. Watching a big city likeLondongradually turn dark and darker into the night is a beautiful journey of time and light. So how about taking a historical evening walk and touchingsome of the nicest areas in centralLondon? Let’s get started.6:30 pmThe walk starts on theMillenniumBridge. On the bridge, watch the scenic city across the River Thames with the skyscrapers gradually lighting up against the darkening skies.TheMillenniumBridgehas been featured in many London-based films, includingHarry Potter, and the filmGuardians of the Galaxy.7:30 pmIt’s getting dark. A fifteen-minute walk northwest fromSt Paul’s Cathedral takes you to the historic Borough Market. During the evenings, you find a lot of restaurants around the market. This is an excellent time to get your dinner.9:00 pmThe next stop isLondonBridge. This is about 6 minutes’ walk from the Borough Market. As you join other onlookers and mentally go through the nursery school rhyme of “LondonBridgeis Falling Down”, you get lost again in history. Why does the song sayLondonBridgeis falling and who is the fair lady?During theLondoncity fire of 1897,LondonBridgeserved an important role in fire control. It was one of the major structures that prevented the fire from crossing over to the other side ofLondon.11:30 pmLondonnever sleeps; it’s a few minutes to midnight and everywhere is still filled with people moving around. About four minutes away from the Golden Jubilee Bridges isTrafalgar Square, our next stop.12:00 amIt’s been a beautiful evening, hasn’t it?1. Where can you visit aGuardians of the Galaxyfilming location?A. In theSt Paul’s Cathedral.B. On theMillenniumBridge.C. In the Borough Market.D. On the Golden Jubilee Bridges.2. What can be learned about the Borough Market?A. It is far fromLondonBridge.B. It is related to a famous song.C. It is an ideal place for dinner.D. It is a modern open-air market.3. What is the main purpose of the text?A. To showLondon’s color1 ful culture.B. To introduce the scenery inLondon.C. To ask people to do outdoor activities.D. To recommend a night tour inLondon.BClara Daly was seated on an Alaska Airlines flight from Boston to Los Angeles when a flight attendant asked an urgent(紧急的) question over the loudspeaker: “Does anyone on board know American Body Language?” She knew she needed to help.Clara, 15 at the time, pressed the call button. The flight attendant came by and explained the situation. “We have a passenger on the plane who’s blind and deaf,” she said. The passenger seemed to want something, but he was traveling alone and the flight attendants couldn’t understand what he needed, according to PEOPLE magazine.Clara had been studying ASL for the past year to help with her dyslexia (阅读障碍) and knew she’d be able to spell on the man’s palm(手掌) by finger. So she unbuckled her seat belt, walked toward the front of the plane, and knelt by the aisle seat of Tim Cook, then 64. Gently taking his hand, she wrote, “How are you? Are you OK?” Cook asked for some water. When it arrived, Clara returned to her seat. She came by again a bit later because he wanted to know the time. On her third visit, she stopped and stayed for a while.“He didn’t need anything. He was lonely and wanted to talk,” Clara said. So for the next hour, that was what they did. She talked about her family and her plans for the future (she wants to be a politician). Cook told Clara how he had gradually become blind over time and shared stories of his days as a traveling salesman. Even though he couldn’t see her, she “looked attentively at his face with such kindness”, a passenger reported.“Clara was amazing,” a flight attendant told Alaska Airlines in a blog interview. “You could tell Cook was very excited to have someone he could speak to, and she was such a warm-hearted girl.” Cook’s reaction: “Best trip I’ve ever had.”Looking for ways to offer help? Start with this random(随时的) act of kindness that can change someone’s life right now.4. The flight attendant asked an urgent question because ________.A. the passenger was traveling aloneB. the plane was in a dangerous situationC. the passenger asked for something suddenlyD. none of the flight attendants could communicate with the passenger5. Why did Clara talk about her plans for the future?A. Because the flight attendant asked her to do so.B. Because she needed topics to go on talking with Cook.C. Because Cook hoped to understand teenagers better.D. Because she wanted to show her dream for the future.6. Which of the following words can best describe Clara?A. Kind and caring.B. Warm-hearted and brave.C. careful and calm.D. opened-minded and confident.7. The passage is mainly written to ________.A. tell a touching story of an amazing girlB. show the great importance of American Body LanguageC. encourage readers to give a hand kindly and randomlyD. show how kind the flight attendant was to help CookCUnderstanding the link between a clean environment and human life is not a new concept. In fact, it was noticed as early as ancient Rome. Today we see how green living has infiluenced our everyday lives. There is a growing community of people who embrace a zero waste lifestyle and make changes to the way they live to reduce their carbon footprint.Living a zero waste lifestyle means doing one’s best to achieve the aim of not sending anything to a landfill. People who adopt this lifestyle ultimately cut down on their waste by reducing what they need and want. They reuse what they own, sending few things to be recycled.Many people who adopt the zero waste lifestyle claim to be frustrated by the many harmful chemical substances found in beauty and cleaning products. They also find the uses of disposable items and excessivepackaging. For example, how many times have we had to peel away layers of plastic wrap and cardboard before finally taking out the item which we had bought? Instead of buying pre-packed food and goods, those who identify with the zero waste philosophy tend to shop in stores that allow them to make purchases and bring their own cloth bags and glass jars to store their purchases.Many people may have the misconception that it is easier to live a zero waste lifestyle in the West. Nevertheless, Malaysian environmental journalist, Ms. Aurora Tin, has proven that a zero waste lifestyle is possible even in the Asian context. Instead of going to the supermarket to buy pre-packaged foods, Ms. Tin now visits the wet market and brings her own bags for vegetables. She has even stopped using store-bought toothpaste and makes her own toothpaste from coconut oil and baking soda. This lifestyle may be too big a change for the average person, but we could follow her suit to make gradual changes to our own lives.8. Which of the following is a zero waste lifestyle?A. Bringing a resuable container to take away food.B. Choosing appliances that cost less money.C. Turning off a device to stop using power.D. Classifying the garbage before throwing it away.9. What may disappoint a person who adopts a zero waste lifestyle?A. Recycable carboard.B. Excessive packaging.C. Glass jars to store purchases.D. Natural substances in cleaning products.10. What is the main idea of the last paragraph?A. How do people live a zero waste lifestyle.B. Why Ms. Tin chooses to live a zero waste lifestyle..C. We can also practice a zero waste lifestyle in Asia.D. It is easy to live a zero waste lifestyle in the West.11. What is the best title of the passage?A. Living a zero waste lifestyle.B. Going green ismore than a fashion.C. A zero waste lifetyle is easy to achieve.D. Making environmentally-conscious decisions.DThe United Nations Educational, Scientific and Cultural Organization (UNESCO) included on December 17, 2020 China's Tai Chi on the Representative List of the Intangible（无形的）Cultural Heritage of Humanity. The decision was announced during the online meeting of the UNESCO Intergovernmental Committee for the Safeguarding of the Intangible Cultural Heritage held from December 14 to19 inKingston, capital ofJamaica.“Born in the mid-17th century in a small village named Chenjiagou located in Central China's Henan province,Tai Chi is not only a kind of traditional Wushu integrated with slow movements and deep breathing, but is also deeply rooted in many areas of Chinese culture, such as medicine and philosophy,”Zhu Xianghua says, who is the son of the famous Tai Chi master Zhu Tiancai.Although it has spread to more than 150 countries and regions, attracting more than 100 million people to practice, the idea that Tai Chi is for the elderly has stopped many young people practicing the ancient Wushu. They think of it as a slow exercise, which is specially made and better suited for their grandparents. Instead, many young people are turning to the Indian practice of yoga（瑜伽）to relieve stress, which was placed on the UNESCO's List in 2019.In order to promote Tai Chi, joint efforts have been made from individuals and the Chinese government in the last decades. Xi'an Jiaotong University requires students to learn Tai Chi. Wang Yunbing, a professor in the university's sports center, stressed that Tai Chi is not only good physical exercise-researchers from the American College of Rheumatology find that it can help manage several diseases but is also conned ted to ancient Chinese eivilization. Since 2014, the World Tai Chi Championships have been held every two years by the International Wushu Federation. It provides a platform for communication and learning between the Tai Chi masters and Tai Chi lovers around the globe. In January 2020, Tai Chi became an official event in the 2026 Dakar Youth Olympic Games.12. What does Zhu Xianghua say about Tai Chi in paragraph 2?A. It originated from fast Kung Fu action.B. It was born around the 1750s in a village.C. It is related to other cultural fields ofChina.D. It integrates Chinese medicine and western philosophy.13. Why do some young people choose to practice yoga instead of Tai Chi?A. They think it easier to practice yoga to keep fit.B. The elderly stop young people practicing Tai Chi.C. They consider Tai Chi is custom-built for old people.D. Yoga was included in the world culture earlier than Tai Chi.14. What is the main purpose of the last paragraph?A. To promote contemporary Chinese civilization.B. To show many efforts made to popularize Tai Chi.C. To stress the importance of Chinese Tai Chi masters.D. To advise people to practise Tai Chi to cure diseases.15. Which of the following is the best title for the passage?A. Tai Chi Steps on the UNESCO's List.B. Tai Chi isCompeting against Yoga.C. Tai Chi Has Regained populate Globally.D. Opinions Greatly Differ on Tai Chi and Yoga.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学年栖霞市实验中学高三英语二模试题及参考答案

2020-2021学年栖霞市实验中学高三英语二模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ASheffieldLincoln College of EnglishClasses for foreign students at all levels.3 months, 6 months, 9 months and one year course.Open all year.Small class (at most 12 students).Library, language laboratory and listening center.Accommodation (住宿)with selected families.25 minutes from London.Course fees for English for one year are￡1,380 with reduction for shorter periods of study.1.This passage is probably taken from _______.A.an advertisementB.a noticeC.a posterD.a piece of news2.Who will be accepted by this college?A.Both foreign and native students.B.Only foreign beginners and the advanced.C.Foreign students from beginners to the advanced.D.Only foreign students advanced.3.While you stay there, who will take care of you?A.Your parents.B.Your classmates.C.The school where you study.D.The family you have chosen.BCuckoos don’t bother building their own nests—they just lay eggs that perfectly imitate those of other birds and take over their nests. But other birds are wishing up, evolving some seriously impressive tricks to spot the cuckoo eggs.Cuckoos are often know asparasites, meaning that they hide their eggs in the nest of other species. To avoid detection, the cuckoos have evolved so that eggs seem reproduction of those of their preferred targets. If the host bird doesn’t notice the strange egg in its nest, the little cuckoo will actually take the entire nest for itself after it comes out, taking the other eggs on its back and dropping them out of the nest.To avoid this unpleasant fate for their young, the other birds have evolved a few smart ways to spot the fakes, which we’re only now beginning to fully understand. One of the most amazing finds is that birds have an extra colour-sensitive cell in their eyes, which makes them far more sensitive to ultraviolet wavelengths and allows them to see a far greater range of colours than humans can. This allows cautious birds to detect a fake egg which might be exactly the same to our eyes.Fascinatingly, we’re actually able to observe different bird species at very different points in their evolutionary war with the cuckoos. For instance, some cuckoos lay their eggs in the nests of the redstarts. The blue eggs these cuckoos lay are practically alike to those of the redstarts, and yet they are still sometimes rejected. Compare that with cuckoos who target dunnocks. While those birds lay perfectly blue eggs, their cuckoo invaders just lay white eggs with brown irregular shaped spots. And yet dunnocks barely ever seem to notice the obvious trick.Biologists suspect these more easily fooled species like the dunnocks are on the same evolutionary path as the redstarts, but they have a long way to go until they evolve the same levels of suspicion. What’s remarkable is that the dunnocks fakes are so bad and the redstart ones so good, and yet cuckoos are still more successful with the former than the latter.It speaks to just how thoroughly a species’ behavior can be changed by the pressures of natural selection, or it might just be a bit of strategic cooperation on the part of the dunnocks. Biologists have suggested that these birds are willing to tolerate a parasite every so often because they don’t want to risk accidentally getting rid of one of their own eggs.4. This passage can be most likely found in a ________.A. science surveyB. nature magazineC. zoo advertisementD. travel journal5. What does the underlined word “parasite” in paragraph 2 most probably refer to?A. Animals that work together to raise young.B Small harmful animals such as worms or mice.C. Animals that can adapt to changing environments.D. Animals which live on or inside other host animals.6. Which of the following is TRUE about the dunnock according to the passage?A. It is colour-blind and therefore cannot identify foreign eggs in the nest.B. It can easily remove cuckoo eggs from the nest because fakes are so bad.C. It is a host bird that is more likely to raise a cuckoo chick than the redstart.D. It is unable to evolve and hence accepts cuckoo eggs that appear in the nest.7. Which of the following can be inferred from the passage?A. Dunnocks may eventually learn to recognise foreign eggs.B. Redstarts seem to be less suspicious compared to dunnocks.C. Cuckoo birds are good at taking responsibility for their own young.D. It is very easy for cuckoos to imitate the colouring of the dunnock’s egg.CThe idea of growing food in a desert would make most people laugh but this is quickly becoming a reality. There are currently two desert farms in the world where quality vegetables are being planted cheaply and easily.Sundrop Farms, based in South Australia, uses experimental greenhouses to grow tomatoes, peppers and cucumbers. The biggest challenge of growing food in a desert, obviously, is the lack of available water. The researchers at Sundrop Farms have gotten aroundthis problemby using the sun to desalinate (淡化) sea water. It can also be used to control the temperature of the greenhouses.Without depending on limited resources such as land and fresh water Sundrop Farms has made farming a practice. This can increase the world’s food supplies. Another benefit ofthis kind of farming is that it can be done anywhere, thus reducing the costs of transporting food to distant locations. Yet another benefit is that it reduces the need for pesticides (杀虫剂).Another experimental desert farm is the Sahara Forest Project, which began in Qatar in December 2012. Greenhouses in the farm are cooled by saltwater. Solar power and other technologies are used together to help make vegetation (植被) grow in the desert environment. As deserts have expanded over recent years around the world due to global warming, this project could solve the problem.The result form the Qatar project were better than expected and in June of 2014, Jordan agreed to host another one. This will be much bigger than the Qatar project and the project members will have even more opportunities to test their experiments on a much larger scale. It is not clear yet that desert farming resents the future of farming but these projects have shown some success in the field.8. What does “this problem” in paragraph 2 refer to?A. Sea water is bard to purify.B. The desert is short of water.C. The temperature is high in the desert.D. Desert farms aren’t fit to plant vegetables.9. What is one of the characters of desert farming?A. It needs more pesticides.B. It saves delivery costs.C. It has a location limit.D. It solves food waste problems10. What can we know about the Sabara Forest Project?A. It lives up to expectationsB. It can help produce more foodC. It is started to prevent global warmingD. It uses technology to produce saltwater11. What can be inferred about desert farming from the last paragraph?A. It still has problems to solve.B. It represents the future of farming.C. Its early success has aroused interest in it.D. Its aim is to create more job opportunities.DOn World Oceans Day, which falls on June 8, the US National Geographic Society announced it would recognize the Southern Ocean in Antarctica, bringing the global total to five.Unlike the Arctic, Atlantic, Indian and PacificOceans—which are defined by the continents that bound them—the Southern Ocean is instead characterized by the Antarctic Circumpolar Current（南极洋流）. According to the National Geographic, the Southern Ocean includes most of the waters surrounding Antarcticaout to 60 degrees south latitude（纬度）."Encircled by the powerfully swift ACC, it is the only ocean to touch three others and to completely embrace a continent rather than being embraced by them," Sylvia Earle, a marine biologist and oceanographer, told the Daily Mail.Those familiar with the Southern Ocean know it's unlike any other. "Anyone who has been there will struggle to explain what's so charming about it, but they'll all agree that the glaciers are bluer, the air colder, the mountainsmore awful and the landscapes morecaptivatingthan anywhere else you can go," Seth Sykora-Bodie, a marine scientist at the National Oceanic and Atmospheric Administration, told National Geographic.National Geographic hopes their revised maps will bring public awareness to the region, thereby encouraging Southern Ocean conservation—but its significance is beyond that."We think it's really important from an educational standpoint, as well as from a map-labeling standpoint, to bring attention to the Southern Ocean as a fifth ocean," Alex Tait, National Geographic Society geographer, told The Post. "So when students learn about parts of the ocean world, they learn it's an interconnected ocean, and they learn there are these regions called oceans that are really important, and there's a distinct one in the icy waters around Antarctica."12. Why is the Southern Ocean different from other oceans?A. It has never been explored before.B. It surrounds the Antarctic all around.C. It is enclosed by the fast-flowing ACC.D. It has ecologically distinct environment.13. What does the underlined word "captivating" in paragraph 4 probably mean?A. Strange.B. Unusual.C. Attractive.D. Informal.14. What does the National Geographic think of the Southern Ocean?A. It will be instructive for students.B. It will promote tourism development.C. It will encourage public to treasure water.D. It will draw scientists to study in the Antarctic.15. What is the best title for the text?A. World Oceans DayB. Revised Antarctic MapsC. Adding a New OceanD. New Discovery under the Sea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。

山东省烟台市栖霞第二中学2020-2021学年高二生物模拟试题含解析

山东省烟台市栖霞第二中学2020-2021学年高二生物模拟试题含解析一、选择题（本题共40小题，每小题1.5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. 下列有关光合作用光反应的叙述错误的是A. 光能的吸收发生在类囊体膜上B. 光反应的产物有ADP、O2、NADPHC. 光反应始于色素吸收、传递和转换光能D. 光反应实现了由光能向活跃化学能的转化参考答案：B叶绿体的类囊体膜上含有光合色素，可以吸收、传递和转化光能，A正确；光反应的产物有ATP、O2、NADPH，B错误；光反应始于色素吸收、传递和转换光能，C正确；光反应将光能转化成了ATP中活跃的化学能，D正确。

2. 皮肤、肠黏膜组织发生炎症时，产生和释放的组织胺使毛细血管舒张和通透性增大，血浆渗入组织间隙而形成水肿。

组织胺对血管的调节方式为( )A激素调节 B体液调节C高级神经中枢调节 D神经—体液—免疫调节参考答案：B3. 下列鉴定生物遗传特性的方法中，较恰当的是A.鉴定一只灰色兔是否是纯合子用测交B.区分狗的长毛与短毛的显隐性关系用测交C.不断提高小麦抗病系的纯度用测交D.测定杂种灰兔F1的遗传因子组成用杂交参考答案：A4. 用于核移植的供体细胞一般都选用（）A. 受精卵B. 传代10代以内的细胞C. 传代10～50代以内的细胞D. 处于减数第二次分裂中期的次级卵母细胞参考答案：B【分析】动物核移植是指将动物的一个细胞的细胞核移入一个去掉细胞核的卵母细胞中，使其重组并发育成一个新的胚胎，这个新的胚胎最终发育为动物个体（克隆动物）。

【详解】核移植的供体细胞是体细胞，A错误。

正常细胞在传代10代以内时能保持细胞正常的二倍体核型，适宜用于核移植的供体细胞，B正确。

细胞传至10-50代左右时，增殖会逐渐缓慢，甚至于完全停止，且此时部分的细胞核型可能会发生变化，所以不适宜用于核移植的供体细胞，C错误。

处于减数分裂第二次分裂中期的次级卵母细胞是核移植的受体细胞，D错误，故选B。

山东省烟台市栖霞庙后镇中学2021年高二地理模拟试卷含解析

山东省烟台市栖霞庙后镇中学2021年高二地理模拟试卷含解析一、选择题(每小题2分，共52分)1. 随着社会经济的发展，影响某一工业部门的主导区位因素会发生一些变化。

下图为“某品牌乳制品广告插图”。

据此回答下面小题。

23. 当前，影响该乳制品生产厂家选址的主导区位因素是 ( )A. 市场B. 原料C. 劳动力D. 技术24. 该类企业布局主导区位因素发生变化，主要是得益于 ( )①冷藏保鲜技术的发展②市场需求量的变化③交通运输的发展④原料需求量增加A. ①②B. ①③C. ②④D. ③④参考答案：23. B 24. B本题主要考查影响工业的区位因素。

在确定工业生产区位因素时，要结合具体工业地区，乳制品生产基地位于草原上属于原料导向型，在大城市附近属于市场导向型；交通运输发展会影响主导区位因素发生变化。

23. 从材料中广告可知产地在巴彦淖尔，乳制品生产厂分布在草原上，主导区位因素属于原料，选择B。

24. 乳制品属于不便于远距离运输的产品，能够远离市场主要得益于冷藏保鲜技术的发展和交通运输的发展，选择B。

2. 区域是客观存在的,具有一定的范围和边界,有的边界明确,有的边界具有一定的过渡性,如下图所示。

据此完成第1~2题。

1.图示区域的客观性主要表现在( )。

A.地理差异是划分的基础,是地球表面的空间单位B.区域是人们按照一定的指标和方法划分出来的C.人们划分的目的不同D.因研究的需要,区域是发展变化的2与图示区域A的边界类型相同的是( )。

①行政区②中国③热量带④干湿区⑤三江平原⑥山东省和青岛市A.①②③B.④⑤⑥C.①②⑥D.③④⑤参考答案：1.A2.C解析:第1题,区域是人们在地理差异的基础上,按照一定的指标和方法划分出来的,是地球表面的空间单位。

区域的客观性主要是地理差异和空间单位。

第2题,热量带、干湿区、三江平原的边界都有一定的过渡性。

3. “鱼光互补”式光伏电站是在水面上架设太阳能电池板发电，水域用于水产养殖，实现“一地两用”提高单位面积土地的经济价值。

2021年栖霞市实验中学高三英语二模试题及答案

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The strong Russian flavor continues to impact the city today due to new trade and tourism betweenHarbinandRussia.TheCentral Avenue: Passers-by only street, a perfect remaining part of the busy international business activities at the turn of the 20th century. The 1.4-km long street is a worthy museum of European architectural styles, including Baroque and Byzantine facades, Jewish architectural wonders, little Russian bakeries, French fashion houses, American snack food outlets, and Japanese restaurants.Guogeli Avenue:Harbin's second biggest shopping district dotted with Russian buildings. A tram track is still preserved in the centre of the road. The street is named after Nikolay (Vasilyevich) Gogol (1809-1852); great Russian novelist, dramatist, satirist, founder of the so-called critical realism in Russian literature, best-known for his novel MERTVYE DUSHI I-II (1842, Dead Souls).Saint Sophia Church (built in 1903): The Orthodox church is a wonderful example of Russian Architecture. We only tour the outside of the church. The inside has been turned into some painters' market and is a big disappointment to all who visit it. You are welcome to venture into the church. Entrance fees are RMB20 per person.1. From where does the author look at the tigers?A. Through the windows of his house.B. In the closed areas of tigers.C. In the areas for walking.D. In their natural environment.2. Where can visitors see the most diverse styles of architecture?A. At Ice Lantern Festival.B. On the Russian Manchurian Railroad.C. On TheCentral Avenue.D. OnGuogeli Avenue.3. When walking in the city ofHarbin, what can visitors still strongly feel?A. The Russian flavor.B. The influence of Guogeli's realism.C. The damage to Saint Sophia Church.D. The mixture of American and Japanese cultures.BIn the world of Chinese archaeology(考古学), a sign of a dig's importance is the sight of Zhou Mingsheng at work. A field technician who has worked at archaeological sites all aroundChina. Master Zhou iscredited with the gentlest touch in his profession. Born into a farming family, he is a “national-level craftsman” with a talent for using simple tools to get relics(遗物) that wouldcrumblein other hands, says his current boss, Wang Xu, director of an archaeological site at Shuanghuaishu, a Neolithic(新石器时代的) settlement near the Yellow River in the central province of Henan.It is not beauty that attracts visitors to Shuanghuaishu. At 5,300 years old, the settlement is the work of a culture too simple to have left behind many buried treasures. The single most precious find, to date, is a finger-length sculpture of a silkworm. Nor is the setting lovely: an area surrounded by deafening insects, between a highway and two power stations. Rather, the site's importance is historical. For since the birth of Chinese archaeology in the 1920s, it has been inseparable from claims thatChinahas the oldest unbroken civilisation on Earth.Leading archaeologists say that the site has the right combination of location, age and distinctive cultural elements to be the capital of an early Chinese kingdom. That would make it a bridge betweenChina's written history and the era of the Yellow Emperor, who is said to rule over these central plains almost 5,000 years ago, though many foreign scholars doubt his existence. Chinese media call the site proof ofChina's 5,000 years of history.Foreigners complain about a lack of written records, Mr. Wang notes. Perhaps they are missing symbols that will one day be understood, for instance in patterned pottery. Outsiders “can't keep using Western standards to apply to Chinese ruins,” he argues.4. What does the underlined word “crumble” in Paragraph 1 mean?A. Break.B. Start.C. Wait.D. Shine.5. Why does Shuanghuaishu attract visitors?A. It has appealing scenery.B. It has various precious treasures.C. It is of great historical significance.D. It is easily accessible.6. What is Mr. Wang's attitude towards foreigners’ view?A. Unconcern.B. Disapproving.C. Supportive.D. Not mentioned.7. What does the passage mainly talk about?A. Chinese history amazes the world.B. Chinese archaeology catches on.C. China follows its tradition.D.Chinadigs its past.CHave you ever been on social media and seen your favorite celebrity talking about a product? These promotions might not be totally random, and are actually seen as a vital part of the marketing process. The question is: How do social media influencers ‘influence’ what you buy?Human desire for status and making friends, combined with our need to belong to a group, makes us receptive to being ‘socially influenced’. Companies often use that desire to have a similar lifestyle to a celebrity we admire to sell or launch a product. So, what do these promotions actually do?Firstly, they can be used to build brand awareness. A social media influencer should have a strong understanding of the platform they operate on, and therefore can create appealing content that not only sticks to the brand image, but sparks their followers’ interests in a product they might never have seen before.Secondly, influencers can improve a company or product’s relationship with their customer base. According to InMoment’s 2018 US Retail CX Trends Report on customer loyalty, 77% of buyers have been brand loyal for more than ten years. This is also true of 60% of millennials. A popular celebrity can target key customers and talk or blog about a product, which can create an instant and lasting bond with them.Lastly, influencers can improve customer buying habits with seemingly ‘unbiased opinions’. We are more likely to respond to ‘peer recommendation’ than traditional ads, meaning the fact we see an influencer as a ‘friend’ can make us less likely to be doubtful about what we are seeing.So, the next time you see a celebrity talking about a product, you might want to consider that this could be a carefully worked-out marketing strategy designed to target your core needs. If you find yourself examining a product you’ve seen on social media, you may well have been influenced.8. Why do companies invite celebrities to launch products?A. Because celebrities can improve the companies’ public images.B. Because consumers like to share similarity with celebrities.C. Because celebrities want to make more money.D. Because consumers can make friends with celebrities.9. According to the passage, which strategy is often used by influencers?A. Setting up operation platforms.B. Sending gifts to customers.C. Improving relationship with the company.D. Taking advantage of their popularity.10. To customers, the recommendations of influencers seem to be ________.A. offensiveB. subjectiveC. objectiveD. misleading11. The passage is mainly about ________.A. how social media make adsB. how social media influence our lifestyleC. how social influencers affect our buyingD. how celebrities earn fameDAs an eco-minimalist, Su Yige has maintained an environmentally friendly and sustainable lifestyle for the past three years while studying in Canada. She takes her own bag when she goes grocery shopping and uses second-hand items as often as possible. She avoids almost all paper-related products unless she has to use a public toilet while away from home.Diligence and thrift are time-honored traditional Chinese virtues. Su's family is a good example of this, according to the native of Weihai, Shandong province. Although they have little formal “green” knowledge, her parents lead a very environmentally friendly life.For example, the family has used the same hair dryer for more than a decade, and Su remembers many of her mother's clothes from as far back as kindergarten. “As long as something can still be used, my mother will not replace it with a new item,” she said.“I frequently asked my father to bring the plastic bag back home after dumping our waste in the trash bin. He was unhappy, and argued that instead of making that request, I should go downstairs to dump the waste myself” she said. In another move, her father criticized her for doing too much shopping online. Eventually, they both made steps toward becoming better environmentalists. Her father brings the bag back for reuse and she has only bought two pieces of clothing online in the past six months.Back in Canada, Su is looking forward to finding a job related to sustainable development in China after she graduates as a computer science major in the summer.12. Which of the following best describes Su Yige?A. Conservative.B. Nostalgic.C. Economical.D. Productive.13. What can be found about Su's mother according to the third paragraph?A. She has a lot of formal green knowledge.B. She regards using the same items as a lifestyle.C. She always wears old clothes due to lack of money.D. She will not replace the old items until they are out of style.14. What can be inferred about Su and her father?A. Both of them like to criticize each other.B. Su's father is particular about her clothes.C. The relationship between them is very tense.D. They urge each other to become more environmentally friendly.15. What can we learn about the author soon after she graduates in Canada?A. She will stay there to look for a job.B. She will put effort into computer science.C. She will devote herself to her motherland's future.D. She will come back to China to stay with her parents.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。

南京市栖霞区2021年中考二模语文试卷及答案答案下载

南京市栖霞区2021年中考二模语文试卷及答案答案下载栖霞区九年级中考模拟测试卷（二）参考答案一（2 22 分）1.（3 分）评分标准：正确 1 分，工整 1 分，美观 1 分2.（6 分）①地利不如人和②蜡炬成灰泪始干③一蓑烟雨任平生④柳暗花明又一村⑤示例：低头思故乡/八年风味徒思浙/思君不见下渝州/尚思为国戍轮台/将以遗所思/杨花榆荚无才思/因思杜陵梦/悠悠我思/寤寐思服......（有错漏添倒，本空不得分）3.（10 分）（1）（2 分）崭融（每空 1 分）（2）（2 分）zàizǎi（每空 1 分）（3）（2 分）答案示例一：（将品质佳作引进剧场，）将戏剧活动带进城市答案示例二：将品质上乘的戏剧佳作引进剧场，（将妙趣横生的戏剧活动带进城市）（内容 1 分，句式 1 分）（4）（4 分）①这个图标整体是由汉字“南”字/字母 nj 变体而来，寓意这是南京戏剧节；②图案由多副面孔叠加而成，寓意戏剧演员舞台呈现的多样性/戏剧冲突（观众可以在戏剧中领略人生百态）；③图标细看像一张笑脸/下半部分又类似鼓掌的双手，代表南京喜迎四方宾朋/寓意观众对戏剧的喜爱之情；④线条蓝色调/图案像一条鲸鱼取自“南京”在南京方言中的谐音“蓝鲸”，暗含了城市特色。

（“南”字、nj 字母、面孔/面具、戏剧冲突、笑脸、双手、谐音，写出任意一点 1 分，答满四点即可；或者介绍图案 1 分，解释寓意 1 分，写出两组即可）4.（3 分）答案示例：台词背诵能力肢体语言能力表情控制能力语言表达能力（每空 1分，项目与戏剧演员能力相关、任答三点即可）二（8 48 分）（一）（1 18 8 分）5.（4 分）①传扬/流传；②白白地；③怎么/哪里；④A（每空 1 分）6.（3 分）假使当日预料到这种情况，就是劝她效仿西施作捧心状，她也知道不屑去做。

（1 个分句 1 分，通顺、意对即可）7.（3 分）B（选 A 得 2 分，选 D 得 1 分，选 C 不得分）【参考译文】“人惟求旧，物惟求新。

2020-2021学年栖霞市第一高级中学高三生物二模试题及答案

2020-2021学年栖霞市第一高级中学高三生物二模试题及答案一、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. 一块弃耕的农田，很快会杂草丛生，几年后，草本植物开始减少，各种灌木繁茂起来，最后演变成一片森林，成为一个相对稳定的生态系统。

在此演变过程中，相关变化趋势正确的是（）A. ①①B. ①①C. ①①D. ①①2. 2018年10月1日宣布，将2018年诺贝尔生理学或医学奖授予美国科学家詹姆斯·艾利森和日本科学家本庶佑，以表彰他们在癌症免疫治疗方面所作出的贡献。

他们的研究提供了一种治疗癌症的方法——通过刺激免疫系统原有的能力，来对抗肿瘤细胞，该项研究发现一种名为PD—1的细胞表面成分能帮助免疫系统识别癌症细胞，请问PD—1的化学成分是()A.磷脂B.胆固醇C.蛋白质D.脂肪3. 人体的个体发育是从受精卵开始的，其中有细胞增殖、细胞分化、细胞衰老和细胞凋亡等现象。

下列相关叙述正确的是（）A.婴儿时期有细胞增殖、细胞分化、细胞衰老和细胞凋亡等现象B.人体中没有同时进行有丝分裂和减数分裂的器官C.有丝分裂和减数分裂过程中均可发生3种可遗传的变异D.人体细胞在增殖过程中染色体数目最多可达92条，最少可达46条4. 下列关于实验原理或实验材料的说法，错误的是（）A. 蛋白质变性后不能与双缩脲试剂发生颜色反应B. 绿叶中的色素在层析液中溶解度不同可被分离C. 观察黑藻细胞中的叶绿体和细胞质环流需保持细胞活性D. 用于侵染细菌的T2噬菌体只能用大肠杆菌培养5. 核酶是具有催化功能的单链RNA分子，可降解特异的mRNA序列。

下列关于核酶的叙述正确的是A.A TP和核酶的元素组成相同，A TP中的“A”不能作为核酶的基本组成单位B.与无机催化剂不同的是核酶能够降低所催化反应的活化能C.核酶降解特异的mRNA序列时，破坏的是相邻碱基之间的氢键D.验证核酶的专一性时，可以用能够鉴定RNA的试剂来检测实验结果6. 一条多肽链，化学式为CxHyOpNqS，将它彻底水解后，只得到下列四种氨基酸，分析推算可知，水解得到的氨基酸个数为（）A.p﹣1B.q+1C.q﹣1D.p+17. 下列关于“观察DNA和RNA在细胞中的分布”实验的说法，正确的是（）A.甲基绿和吡罗红对DNA和RNA的亲和力不同，实验中应分别加入甲基绿和吡罗红B.盐酸能够改变细胞膜的通透性，加速染色剂进入细胞C.该实验用口腔上皮细胞而不用叶肉细胞，是因为叶肉细胞不含RNAD.盐酸有利于染色质中DNA与蛋白质分开，不利于DNA与染色剂结合8. 探究利用秋水仙素培育四倍体蓝莓的实验中，每个实验组选取50株蓝莓幼苗，以秋水仙素溶液处理它们的幼芽，得到结果如图所示，相关说法不正确的是（）A.因变量是多倍体的诱导率，自变量是秋水仙素浓度和处理时间B.由实验结果可知秋水仙素浓度和处理时间均影响多倍体的诱导率C.实验原理是秋水仙素能够抑制纺锤体的形成，诱导形成多倍体D.判断是四倍体蓝莓最可靠的方法是观察体细胞后期的染色体数9. 艾滋病（AIDS）是由人类免疫缺陷病毒（HIV）引起的，该病毒是逆转录病毒，它能精确地识别并侵入CD4+T细胞（辅助性T细胞），逐渐使免疫系统瘫痪、功能瓦解，最终使患者死于严重感染或恶性肿瘤。

2021届栖霞市实验中学高三英语二模试卷及答案

2021届栖霞市实验中学高三英语二模试卷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ANational Disability Insurance Scheme (方案)The National Disability Insurance Scheme (NDIS) will transform the way Queenslanders with disability are supported and change the way disability services are funded and delivered.Under the scheme, Queenslanders with disability will have choice and control over how they access support and who delivers them. They will also have certainty that they will be supported throughout their lifetime to achieve their personal goals.The NDIS will have an effect on the following programs.School Transport Assistance Program for Students with DisabilityThe NDIS will not disrupt existing services for qualified students. The Queensland Government will also continue to provide school transport assistance for students with disability who are not qualified to receive funding via the NDIS.For more information about the School Transport Assistance Program, and to check your qualification, visit the Education and Training website.Taxi Subsidy (补助金) SchemeThe Queensland Governmenthas lengthened the Taxi Subsidy Scheme (TSS) membership for NDIS qualified members to 31 October, 2022. This will allow more time to solve transport support arrangements under the Commonwealth’s NDIS.You can find more information about the TSS and your qualification on the TransLink website.Disability Parking Permit SchemeNo changes will be made to the Disability parking permit scheme when the NDIS is introduced inQueensland. Current arrangements for this scheme will be maintained.You can find more information on this scheme, and check your qualification, on the Queensland Government website.Public Transport Concessions for People with DisabilityThere will be no change to concessions on public transport for people with disability when the NDIS isintroduced inQueensland. TransLink will continue to ensure concessions are provided for disabled persons travelling on public transport inQueenslandwhen the NDIS is introduced.You can find more information about public transport discounts for people with disability, and check your qualification, on the TransLink website,1.Which program helps drive the disabled to and from school?A.Taxi Subsidy Scheme.B.Disability Parking Permit Scheme.C.Public Transport Concessions for People with Disability.D.School Transport Assistance Program for Students with Disability.2.What can we learn about Taxi Subsidy Scheme?A.The scheme is for parking permit.B.The existing membership can be effective for longer time.C.There is no change to current arrangements for the scheme.D.The NDIS will not break off existing services for qualified students.3.What do the four programs have in common?A.They are all related to transport.B.They are all largely affected by NDIS.C.They all can be checked on the same website.D.They all provide discounts for disabled persons.BAnOntarioteen is making waves by turning old fishing gear into new treasures. Since last year, Natalie, 15, hasbeen taking lost or thrown — away fishing nets and rope and transforming them into bracelets, rope art, mats, baskets and necklaces.Last year, Natalie was working on an assignment for her science, technology, engineering and mathematics (STEM) class. As part of the assignment, she learned about “ghost nets”, which are fishing nets that have been left or lost in the ocean by people who fish.“They have huge effects on our environment. They can kill coral reefs and many animals,” said Natalie. “46 percent of the Pacific garbage is ghost gear.” The Great Pacific Garbage is a huge collection of trash floating in the Pacific Ocean betweenHawaiiandCalifornia.Natalie told her mom she wanted to do something to help. She got in touch with a handful of charities,including the Sea Protection Society and Coastal Action.After getting some shipments of ghost nets and rope from those organizations, Natalie, with the help of her family, started turning thediscardedgear into new artworks. “We've made bracelets, rope art, mats, baskets, and we've made necklaces, which also use beach glass in them,” she said. Natalie then started selling the artworks online, the crafty buying and selling website.She donated all her profits-minus a small sum of change to cover supplies — to the charities that donated fishing supplies to her. She's also been donating all the income from her non-profit business, called Nautical Waters, to charity. Natalie said she hoped to continue her passion for ocean life, with plans to study marine biology in university.4. How did Natalie help with ghost nets?A. By turning them into artworks.B. By asking support from her mother.C. By collecting money from charities.D. By selling ghost nets at a good price.5. What made Natalie decide to do something with ghost nets?A. To collect supplies for the artworks.B. To prepare for her study in university.C. To protect coral reefs and marine animals.D. To complete an assignment for her STEM class.6. What docs the underlined word “discarded" in Paragraph5refer to?A. Polluted.B. Rare.C. Waste.D. Discovered.7. What is the best title for the text.A. Ghost Nets Ready forSaleB. Charities Make a Big DifferenceC. Natalie's Passion for Ocean TreasuresD. TeenTurnsOld Fishing Nets into ArtworksCYour best friend that follows you around when the sun comes out - your shadow - doesn’t serve an important function like your heart or brain, but what if you could use shadows to create electricity? When using solar panels (电池板) that are powered by light, shadows can be boring because it means electricity can’t be created. However, researchers from the National University of Singapore have engineered a way to create power from the shadows present everywhere.A team of the university created a machine that can collect energy from shadows. It is created by placing a thin coating of gold onto silicon (硅). Like in a normal solar panel, when put in light, the silicon electrons (电子) become energized and the energized electrons then jump from the silicon to the gold. The voltage (电压) of the part of the machine that is placed in the light increases to the dark part and the electrons in the machine flowfrom high to low voltage. They are sent through an external circuit (外电路) creating a current that can be used to power another machine. The greater the contrast between light and dark, more energy is provided by the machine.The team isworking on improving the performance of the machine, borrowing approaches from solar panels to gather light. Increasing the amount of light the machines can receive allows them to better make use of shadows, as well as developing shadow energy collecting panels that can successfully gather from indoor lighting. The team is also researching the use of other materials other than gold to drop the price of the machine, meaning they would be more cost effective and easier to apply in society.Shadows are present everywhere and perhaps one day in the future we will be able to collect energy from them by placing the shadow-effect energy machine around the world in places that have been considered unfit for solar panels to work, or indoors. “A lot of people think that shadows are useless,” Tan says, but “anything can be useful, even shadows.”8. What is Paragraph 1 mainly about?A. Your best friend always stays with you after the sunrise.B. The shadow has the same function as the heart and brain.C. Shadows can stop solar panels from creating electricity.D. Researchers have found a way to create power from shadows.9. What is the key working principle of the machine mentioned in the text?A. The silicon produces electricity when it is in the light.B. The gold produces power with the help of the silicon.C. The energized electrons flow from high to low voltage.D. An external circuit creates current using another machine.10. How does the team improve the performance of the machine?A. Using solar panels in the machine.B. Increasing the amount of light received.C. Developing light energy collecting panels.D. Bringing down the price of gold.11. Which of the following is the best place to apply the machine?A. A gym.B. A park.C. A farm.D. A playground.DAge has never been a problem for 16-year-old Thessalonika Arzu-Embry. After all, she’s already got her master’s degree.The North Chicago-area teen started homeschooling at the age of 4. She began having an influence on others soon after. When she was 6 years old, she was an inspirational speaker at an organization called Tabitha House Community Service, which is for people who were forced to leave their homes because of earthquake, flood and other natural disasters.At the age of 11, she graduated from high school and then earned her bachelor’s degree in psychology in 2013. She completed those classes online as she was traveling for church events and leadership meetings.She doesn’t stop there, though. The teen plans to focus on aviation psychology (航空心理学) for her further study, a decision inspired by her father who is a pilot. She grew up around airplanes and took fights all the time. Her goal is to use it to help pilots deal with problems that could have deadly results once the plane takes off — a topic that has been in the news lately. For her, it’s a mix of two of her interests.In her free time, Thessalonika enjoys playing tennis, swimming and being active in her youth group at church. She also has three self-published books, which are on her site. Jump the Education Barrier is written to help students finish college, and in the future aims to help business owners with trends. Her third book The Genius Race is designed to help people to be talents in various areas of life.12. Which of the following is TRUE about Thessalonika?A. When she was 6 years old, she started homeschooling.B. She gained her master’s degree at the age of 11.C. She majored in science and technology.D. In 2013 she got her bachelor’s degree through completing courses online.13. What is her next plan according to the passage?A. Major in aviation psychology.B. Deliver inspiring speeches for church events and leadership meetings.C. Be active in her youth group at church.D. Write another book to help people to be talents.14. Why does she write the book Jump the Education Barrier?A. It aims to help people to be geniuses.B. It is intended to give students a hand to complete college.C. It is designed to arouse people’s awareness of psychology.D. The author hope to share her own experience with others.15. Which ofthe following can be the best title for the text?A. The Story of ThessalonikaB. To be a talentC. Three Published BooksD. Homeschooling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。

2021年栖霞市实验中学高三英语第二次联考试题及答案

2021年栖霞市实验中学高三英语第二次联考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AStaying-at-home proves to be effective in slowing the spread of the virus, but loneliness can be tough for many. Luckily, in the age of social media, we are never truly alone. And with the extra time spent indoors, artists are stepping up to help us all with the following clubs.Drawing from Distance by Sarah Beth MorganLet’s shine some light during this trying time and encourage social distancing! I’m starting this tomorrow myself — but from what I offer, take whatever you please. No rules! Just have fun!Stayathome Art Club byCarsonEllisHello! I’ll be posting art homework here every weekday morning when I can. They’ll be designed for kids and grownups alike. Here is your first homework: Draw a picture of yourself from the shoulders up. You can follow some useful examples. If you want to share or see other people’s self-picture, use these hashtags: #Stayathomeartclub# QACselfportrait30-Day indoor Art by Danielle KrysaOne month of avoiding crowds? I’m in! I challenge you to use this time inside to make one piece every day from now until mid April. Please join me in playing around with some painting ideas that have been rolling around in my head but haven’t found their way onto paper yet. Stay at home, make art, save someone’s life.DIY from Illustoria MagazineWe have been so inspired to see our community come together to provide easy art projects for families during this stay-at-home-time! DIY is actually a fantastic way tosparkyour imagination without breaking a sweat. A video every day will teach you how to DIY something.1. What do we know about Sarah Beth Morgan?A. She is a strict artist.B. She aims at training more artists.C. She prefers to work at home office.D. She will provide a wide range of choices.2. What are you expected to do if you join Stayathome Art Club?A. Hand in homework every day.B. Share other people’s pictures.C. Draw a picture of yourself.D. Show up in person occasionally.3. What does “spark”in the last paragraph probably mean?A. Set off.B. Set down.C. Set aside.D. Set about.BIt’s a big change from homeless teen to Yale (耶鲁)medical school student, butperseverancepaid off for Chelesa Fearce of Clayton County, Georgia.Fearce was a fourth grader when her mom was diagnosed (诊断) with Lymphoma (淋巴瘤).That began a hard time for the family. They had to move in and out of shelters,hotels and even the family car.“I know I have been made stronger. I was homeless. My family slept on the floor and we were lucky if we got more than one full meal a day. Getting a shower, food and clean clothes was an everyday struggle,” Fearce said in a speech she gave at her high school graduation ceremony. Fearce overcame her day-to-day struggles by focusing on a better day. “I just told myself to keep working, because the future will not be like this anymore. And that helped me get through,” she told WSBTV.Fearce was determined to be a good role model for her younger sister. She found inspiration in her late grandmother, struggling with deadly diseases, who gave Fearce emotional support. In her junior and senior year, Fearce took both high school and college courses, missing out on the free meals she depended on so she could get to her college classes. Despite having to use her cellphone to study after the shelter lights were turned off at night, she not only graduated as valedictorian (毕业生代表) of her 2013 class with a 4.5 grade average, but was also given a ride scholarship—including a meal plan to Spelman College in Atlanta.After graduation, she worked full time for two years at the National Institutes for Health inBethesda,Maryland,doing research on drugs. Last fall, she entered Yale and set a course to earn both a PhD and medical degree.4. What does the underlined word “perseverance” in paragraph 1 refer to?A. instant passion.B. continuous efforts.C. great patience.D. selfless ambitions.5. How did Fearce feel facing the sufferings?A. Sad and disappointed.B. Stressed and defeated.C. Determined and confident.D. Joyous and contented.6. What can we know about Fearce’s learning experience?A. Her grandma encouraged her to study medicine.B. Her high school offered her free meals and courses.C. She failed to study late due to frequent power cut.D. She gained remarkable high school achievement.7. What can be a suitable title for the text?A. From Homeless to YaleB. Meet American’s Top GirlC. Disabled but not DefeatedD. Chelesa Fearce: A Girl of Many TalentsCHumans are the only creature that gets around by standing up and putting one foot in front of the other. Our ability to walk upright has allowed humankind to travel great distances and survive changing climates, environments and landscapes.Countless scientific studies have found that walking is really good for us and this simple act can provide a number of healthimplications, which help people live longer. In fact, a walking routine, if done properly, might be the only exercise people need.How much walking should one aim for? You’ve likely heard we need 10,000 steps a day. That’s about 5 miles. But contrary to popular belief, this recommendation doesn’t come from science. Instead, itis from a 1960s advertising campaign to promote a pedometer (计步器) in Japan. Perhaps because it’s a round number and easy to remember, it stuck.Since the 1960s, researchers have studied the 10,000-steps-a-day standard and have turned up mixed results. Although 10,000 steps is certainly a healthy and worthwhile goal, it’s not fit for all.For instance, a recent Harvard University study involving more than 16,000 senior women found that those who got at least 4,400 steps a day greatly reduced their risk of dying early when compared with less active women. The study also noted that these benefits continued up to 7,500 steps. This 7,500 mark isn’t surprising: It’s similar to common public health recommendations, such as the Centers for Disease Control and Prevention’s recommendation of 150 minutes of moderate (适度的) physical activity a week for adults.8. What does the underlined word “implications” in Paragraph 2 refer to?A. BenefitsB. Problems.C. Habits.D. Manners.9. Where does the 10,000-steps-a-day standard come from?A. A Harvard University study.B. Science research on health.C. A pedometer advertisement.D. Public health recommendation.10. What can we know from the last paragraph?A. 7,500-steps-a-day standard is the best choice for all.B. More than 16,000 old people were involved in the study.C. Those who walk at least 4,400 steps a day won’t die early.D. 150-minute moderate exercise a week for adults is advised.11. What does the author mainly want to tell readers?A. The more you walk a day, the healthier you will be.B. We can benefit from continuous and proper walking.C. Walking upright helps humankind to explore the world.D. Advertisements can always tell us some scientific suggestions .DFairy tales perform many functions. They entertain, encourage imagination and teach problem—solving skills. They can also provide moral lessons, highlighting the dangers of failing to follow the social codes that let human beings coexist in harmony. Such moral lessons may not mean much to a robot, but a team of researchers at Georgia Institute of Technology believes it has found a way to use the fairy tales as moral lessons that AI (artificial intelligence) can take to its cold, mechanical heart.The collected stories of different cultures teach children how to behave in socially acceptable ways with examples of proper and improper behavior in fables, novels and other literature. We believe story comprehension in robots can prevent the intelligent robots from killing humanity which was predicted and feared by some of the biggest names in technology including Stephen Hawking and Bill Gates. This system is called “Quixote” (堂吉诃德). It collects story plotsfrom the Internet and then uses those stories to teach robots how to behave.The experiment done by the designers involves going to a drugstore to purchase some medicine for a human who needs to get it as soon as possible. The robot has three options. It can wait in line; it can interact with the store keeper politely and purchase the medicine with priority; or it can steal the medicine and escape. Withoutany further directives(指令), the robot will come to the conclusion that the most efficient means of obtaining the medicine is to steal it. But Quixote offers a reward for waiting in line and politely purchasing the medicine and a punishment for stealing it. In this way, the robotwill learn the moral way to behave on that occasion.Quixote would work best on a robot that has a very limited function. It’s a baby step in the direction of teaching more moral lessons into robots. We believe that AI has to be trained to adopt the values of a particular society, and in doing so, it will strive to avoid unacceptable behavior. Giving robots the ability to read and understand our stories may be the most efficient means.12. What function do fairy tales perform in the robots?A. They entertain robots.B. They highlight dangers.C. They make robots more intelligent.D. They enable robots to behave morally.13. What is “Quixote” in the text?A. A punishment systemB. A character in literatureC. A big name in technologyD. A software educating robots.14. What does the designer expect robot to do in the experiment?A. To take advantage of its privilege.B. To finish the task most efficiently.C. To perform in a good mannered way.D. To be rewarded by the storekeeper115. Which of the follow can bestexpress the author’s opinion?A. Robots will definitely have more functions.B. Robots with human’s emotions are perfect.C. Training robots to be socially acceptable is necessary.D. The development of robots is still in a baby step.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。

2021年江苏省南京市栖霞区中考数学二模试卷

2021年江苏省南京市栖霞区中考数学二模试卷一、选择题（本大题共6小题，每小题2分，共12分）1．（2分）﹣2的相反数是（）A．2B．﹣2C．D．﹣2．（2分）化简的结果是（）A．﹣4B．4C．±4D．23．（2分）根据相关部门统计，2020年全国普通高校毕业生约8340000人．将8340000用科学记数法表示应为（）A．83.4×105B．8.34×105C．8.34×106D．0.834×107 4．（2分）若＜a＜，则下列结论中正确的是（）A．1＜a＜2B．1＜a＜3C．2＜a＜3D．2＜a＜45．（2分）实数a，b在数轴上的对应点的位置如图所示，如果ab＞c，|c|＞1，那么实数c 在数轴上的对应点的位置可能是（）A．B．C．D．6．（2分）在平面直角坐标系中，⊙P经过点A（0，）、B（0，3），⊙P与x轴相切于点C，则点P的坐标是（）A．（3，2）B．（3，3）C．（3，2）或（﹣3，2）D．（3，3）或（﹣3，3）二、填空题（本大题共10小题，每小题2分，共20分）7．（2分）﹣3的绝对值是，﹣3的倒数是．8．（2分）计算的结果是．9．（2分）使有意义的x的取值范围是．10．（2分）已知x、y满足方程组，则x+y的值为．11．（2分）已知方程x2﹣3x+1＝0的根是x1和x2，则x1+x2﹣x1x2＝．12．（2分）方程﹣＝0的解是．13．（2分）为了了解某区初中学生的视力情况，随机抽取了该区500名初中学生进行调查．整理样本数据，得到下表：视力 4.7以下 4.7 4.8 4.9 4.9以上人数102988093127根据抽样调查结果，估计该区12000名初中学生视力不低于4.8的人数是．14．（2分）如图，在△ABC中，BC的垂直平分线MN交AB于点D，CD平分∠ACB．若AD＝2，BD＝3，则AC的长．15．（2分）已知关于x的方程kx2﹣（3k+1）x+2k+2＝0根都是整数；若k为整数，则k的值为．16．（2分）如图，在△ABC中，∠BAC＝120°，AB＝AC＝3，AD⊥BC，点P为直线AD 上一点，连接BP，将BP绕点B顺时针旋转60°得到BQ，则点A、Q距离的最小值为．三、解答题（本大题共11小题，共88分．请在答题卡指定区域内作答，解答时应写出文字说明、证明过程或演算步骤）17．（7分）化简：÷（﹣1）18．（7分）解方程：2x2﹣4x﹣5＝0（用公式法）19．（8分）如图，在▱ABCD中，点E、F分别在边AB、CD上，∠ADE＝∠CBF，EF与BD相交于点O．求证：BO＝DO．20．（8分）已知反比例函数y1＝与正比例函数y2＝x相交于A（2，2）．（1）求k值．（2）画出反比例函数的图象．（3）当y1＞y2时，直接写出x的范围？（4）根据图象，解不等式＜x﹣3．21．（8分）某学校组织“中秋诗词大会”，全体学生参与初赛，为了更好的了解学生成绩分布情况，随机抽取了部分学生的成绩（满分100分），整理得到如下不完整的统计图表：组别成绩x分频数（人数）频率第1组60≤x＜706a第2组70≤x＜800.24第3组80≤x＜9024第4组90≤x≤100b0.16请根据图表中所提供的信息回答下列问题：（1）统计表中a＝，b＝；（2）补全条形统计图；（3）本次调查结果的中位数在第小组；（4）根据调查结果，请估计该学校1500名学生中，成绩不低于80分的人数．22．（8分）一个不透明的袋子中，装有2个红球，1个白球，2个黄球，这些球除颜色外都相同．求下列事件的概率：（1）搅匀后从中任意摸出1个球，恰好是黄球；（2）搅匀后从中任意摸出2个球，2个都是红球．23．（8分）如图，一辆轿车在经过某路口的感应线B和C处时，悬臂灯杆上的电子警察拍摄到两张照片，两感应线之间距离BC为12m，在感应线B、C两处测得电子警察A的仰角分别为∠ABD＝18°，∠ACD＝14°．求电子警察安装在悬臂灯杆上的高度AD的长．（参考数据：sin14°≈0.242，cos14°≈0.97，tan14°≈0.25，sin18°≈0.309，cos18°≈0.951，tan18°≈0.325）24．（8分）如图，AB是⊙O的直径，且点C为⊙O上的一点，M是OA上一点，过M作AB的垂线交AC于点N，交BC的延长线于点E，作直线CF交EN于点F，且FE＝FC．（1）证明：CF是⊙O的切线；（2）设⊙O的半径为5，AC＝CE＝8，求线段MO的长．25．（8分）某公司生产甲、乙两种产品，已知生产甲种产品每千克的成本费是30元，生产乙种产品每千克的成本费是20元，物价部门规定，这两种产品的销售单价（每千克的售价）之和为80元，经市场调研发现，甲种产品的销售单价为x（元），在公司规定30≤x ≤60的范围内，甲种产品的月销售量y1（千克）符合y1＝﹣2x+150，乙种产品的月销售量y2（千克）与它的销售单价成正比例，当乙产品单价为30元（即：80﹣x＝30）时，它的月销售量是30千克．（1）求y2与x之间的函数关系式；（2）公司怎样定价，可使月销售利润最大？最大月销售利润是多少？（销售利润＝销售额﹣生产成本费）（3）是否月销售额越大月销售利润也越大？请说明理由．26．（9分）如图，在△ABC中．（1）如图1，∠C＝90°，∠A＝30°．sin30°＝；tan15°＝．（2）如图2，∠B＝2∠C，BC＝5，AC＝6．①求AB的长度．②P为AC上一点，以A、B、C中的两点及点P为顶点的三角形为等腰三角形，直接写出AP的长度．27．（9分）已知二次函数y＝mx2+mx+n．（1）若图象经过点（0，2）．①n的值为；②无论m为何值，图象一定经过另一个定点．（2）若图象与x轴只有1个公共点，求m与n的数量关系．（3）若该函数图象经过（1，3），写出函数图象与坐标轴的公共点个数及对应的m的取值范围．2021年江苏省南京市栖霞区中考数学二模试卷参考答案与试题解析一、选择题（本大题共6小题，每小题2分，共12分）1．（2分）﹣2的相反数是（）A．2B．﹣2C．D．﹣【解答】解：根据相反数的定义，﹣2的相反数是2．故选：A．2．（2分）化简的结果是（）A．﹣4B．4C．±4D．2【解答】解：＝＝4．故选：B．3．（2分）根据相关部门统计，2020年全国普通高校毕业生约8340000人．将8340000用科学记数法表示应为（）A．83.4×105B．8.34×105C．8.34×106D．0.834×107【解答】解：8340000用科学记数法表示为8.34×106．故选：C．4．（2分）若＜a＜，则下列结论中正确的是（）A．1＜a＜2B．1＜a＜3C．2＜a＜3D．2＜a＜4【解答】解：∵1＜＜a＜＜3，∴1＜a＜3，故选：B．5．（2分）实数a，b在数轴上的对应点的位置如图所示，如果ab＞c，|c|＞1，那么实数c 在数轴上的对应点的位置可能是（）A．B．C．D．【解答】解：A选项，c＞0，ab＜0，∴ab＜c，不符合题意；B选项，根据数轴得|c|＜1，不符合题意；C选项，根据数轴得|c|＜1，不符合题意；D选项，根据数轴得ab＜0，c＜0，这种情况存在，符合题意．故选：D．6．（2分）在平面直角坐标系中，⊙P经过点A（0，）、B（0，3），⊙P与x轴相切于点C，则点P的坐标是（）A．（3，2）B．（3，3）C．（3，2）或（﹣3，2）D．（3，3）或（﹣3，3）【解答】解：如图1，过P作PD⊥y轴于D，连接PC，∵⊙P与x轴相切于点C，∴PC⊥x轴，∴四边形OCPD是矩形，∴PC＝OD，PD＝OC，∵点A（0，）、B（0，3），∴AB＝2，∴BD＝AD＝AB＝，∵∠PCO＝∠PDO＝∠COD＝90°，∴四边形PCOD是矩形，∴PC＝OD＝2，连接PB，∴PB＝PC＝2，在Rt△PBD中，PD＝＝＝3，∴P（3，2）；如图2，同理可得，P（﹣3，2），综上所述，点P的坐标是（3，2）或（﹣3，2），故选：C．二、填空题（本大题共10小题，每小题2分，共20分）7．（2分）﹣3的绝对值是3，﹣3的倒数是﹣．【解答】解：﹣3的绝对值是3；﹣3的倒数是﹣；故答案为：3；﹣．8．（2分）计算的结果是2．【解答】解：原式＝＝＝＝2．故答案是：2．9．（2分）使有意义的x的取值范围是x≥1．【解答】解：∵有意义，∴x﹣1≥0，解得x≥1．故答案为：x≥1．10．（2分）已知x、y满足方程组，则x+y的值为1．【解答】解：，由①+②得3x+3y＝3，∴x+y＝1，故答案为：1．11．（2分）已知方程x2﹣3x+1＝0的根是x1和x2，则x1+x2﹣x1x2＝2．【解答】解：∵方程x2﹣3x+1＝0的两个实数根为x1、x2，∴x1+x2＝3、x1x2＝1，∴x1+x2﹣x1x2＝3﹣1＝2．故答案为2．12．（2分）方程﹣＝0的解是x＝6．【解答】解：去分母得：3（x﹣2）﹣2x＝0，去括号得：3x﹣6﹣2x＝0，整理得：x＝6，经检验得x＝6是方程的根．故答案为：x＝6．13．（2分）为了了解某区初中学生的视力情况，随机抽取了该区500名初中学生进行调查．整理样本数据，得到下表：视力 4.7以下 4.7 4.8 4.9 4.9以上人数102988093127根据抽样调查结果，估计该区12000名初中学生视力不低于4.8的人数是7200．【解答】解：估计该区12000名初中学生视力不低于4.8的人数是12000×＝7200（人），故答案为：7200．14．（2分）如图，在△ABC中，BC的垂直平分线MN交AB于点D，CD平分∠ACB．若AD＝2，BD＝3，则AC的长．【解答】解：∵BC的垂直平分线MN交AB于点D，∴CD＝BD＝3，∴∠B＝∠DCB，AB＝AD+BD＝5，∵CD平分∠ACB，∴∠ACD＝∠DCB＝∠B，∵∠A＝∠A，∴△ACD∽△ABC，∴＝，∴AC2＝AD×AB＝2×5＝10，∴AC＝．故答案为：．15．（2分）已知关于x的方程kx2﹣（3k+1）x+2k+2＝0根都是整数；若k为整数，则k的值为0或±1．【解答】解：①当k＝0时，原方程可化为﹣x+2＝0，∴x＝2，此种情况符合题意；②当k≠0时，原方程为一元二次方程，∵关于x的方程kx2﹣（3k+1）x+2k+2＝0有根，∴△＝[﹣（3k+1）]2﹣4k（2k+2）＝k2﹣2k+1＝（k﹣1）2≥0，∴k为非0实数，设关于x的方程kx2﹣（3k+1）x+2k+2＝0的两根为x1，x2，根据根与系数的关系得，x1+x2＝＝3+，x1x2＝＝2+，∵关于x的方程kx2﹣（3k+1）x+2k+2＝0根都是整数，∴x1+x2，x1x2也是整数，∴和也是整数，∵k为整数，∴k＝±1，即满足条件的k为0或±1，故答案为0或±1．16．（2分）如图，在△ABC中，∠BAC＝120°，AB＝AC＝3，AD⊥BC，点P为直线AD 上一点，连接BP，将BP绕点B顺时针旋转60°得到BQ，则点A、Q距离的最小值为．【解答】解：如图，作点A关于BC的对称点E，连接AE，QP，过点A作AF⊥QE于F，∵∠BAC＝120°，AB＝AC＝3，AD⊥BC，∴∠BAD＝∠CAD＝60°，∠ABC＝30°，∵点A，点E关于BC对称，∴AB＝BE，∠ABD＝∠EBD＝30°，∴∠ABE＝60°，∴△ABE是等边三角形，∴AB＝BE＝AE＝3，∠BAE＝∠BEA＝60°，∵将BP绕点B顺时针旋转60°得到BQ，∴∠PBQ＝60°，BP＝BQ，∴∠ABE＝∠PBQ，∴∠ABP＝∠QBE，在△ABP和△EBQ中，，∴△ABP≌△EBQ（SAS），∴∠BAP＝∠BEQ＝60°，∴∠AEF＝60°，∴点Q在与AE成60°的直线EF上运动，由垂线段最短可得，点A、Q距离的最小值为AF的长，∵sin∠AEF＝＝，∴＝，∴AF＝，故答案为．三、解答题（本大题共11小题，共88分．请在答题卡指定区域内作答，解答时应写出文字说明、证明过程或演算步骤）17．（7分）化简：÷（﹣1）【解答】解：原式＝÷＝×＝﹣1．18．（7分）解方程：2x2﹣4x﹣5＝0（用公式法）【解答】解：2x2﹣4x﹣5＝0，b2﹣4ac＝（﹣4）2﹣4×2×（﹣5）＝56，x＝，x1＝，x2＝．19．（8分）如图，在▱ABCD中，点E、F分别在边AB、CD上，∠ADE＝∠CBF，EF与BD相交于点O．求证：BO＝DO．【解答】证明：∵四边形ABCD是平行四边形，∴AB＝CD，AD＝BC，∠A＝∠C，∵，∴△DAE≌△BCF（ASA），∴DE＝BF，AE＝CF，∵AB＝CD，AE＝CF，∴BE＝DF，∴四边形BFDE是平行四边形，∴OB＝OD．20．（8分）已知反比例函数y1＝与正比例函数y2＝x相交于A（2，2）．（1）求k值．（2）画出反比例函数的图象．（3）当y1＞y2时，直接写出x的范围？（4）根据图象，解不等式＜x﹣3．【解答】解：（1）∵反比例函数y1＝与正比例函数y2＝x相交于A（2，2）．∴k＝2×2＝4．（2）画出反比例函数的图象如图，（3）由图象可知，当0＜x＜2和x＜﹣2时，y1＞y2．（4）观察图象，直线y＝x向下平移3个单位，与反比例函数的交点为（4，1）和（﹣1，﹣4），∴不等式＜x﹣3的解集为：﹣1＜x＜0和x＞4．21．（8分）某学校组织“中秋诗词大会”，全体学生参与初赛，为了更好的了解学生成绩分布情况，随机抽取了部分学生的成绩（满分100分），整理得到如下不完整的统计图表：组别成绩x分频数（人数）频率第1组60≤x＜706a第2组70≤x＜800.24第3组80≤x＜9024第4组90≤x≤100b0.16请根据图表中所提供的信息回答下列问题：（1）统计表中a＝0.12，b＝8；（2）补全条形统计图；（3）本次调查结果的中位数在第3小组；（4）根据调查结果，请估计该学校1500名学生中，成绩不低于80分的人数．【解答】解：（1）本次调查的学生有：12÷0.24＝50（人），a＝6÷50＝0.12，b＝50×0.16＝8，故答案为：0.12，8；（2）补全条形统计图如图：（3）中位数在第25位和26位，∴中位数在第3组80≤x＜90，故答案为：3；（4）1500×（+0.16）＝1500×0.64＝960（人）．答：该学校1500名学生中，成绩不低于80分的有960人．22．（8分）一个不透明的袋子中，装有2个红球，1个白球，2个黄球，这些球除颜色外都相同．求下列事件的概率：（1）搅匀后从中任意摸出1个球，恰好是黄球；（2）搅匀后从中任意摸出2个球，2个都是红球．【解答】解：（1）搅匀后从中任意摸出1个球，所有等可能出现的结果共有5种，满足“恰好是黄球”（记为事件A）的结果有2种，∴P（A）＝；（2）列表如下：红红白黄黄红红红红白红黄红黄红红红红白红黄红黄白白红白红白黄白黄黄黄红黄红黄白黄黄黄黄红黄红黄白黄黄共有20种等可能的结果，其中2个都是红球（记为B）的结果有2种，∴P（B）＝＝．23．（8分）如图，一辆轿车在经过某路口的感应线B和C处时，悬臂灯杆上的电子警察拍摄到两张照片，两感应线之间距离BC为12m，在感应线B、C两处测得电子警察A的仰角分别为∠ABD＝18°，∠ACD＝14°．求电子警察安装在悬臂灯杆上的高度AD的长．（参考数据：sin14°≈0.242，cos14°≈0.97，tan14°≈0.25，sin18°≈0.309，cos18°≈0.951，tan18°≈0.325）【解答】解：设电子警察安装在悬臂灯杆上的高度AD的长为xm．在Rt△ADB中，tan∠ABD＝，∴BD＝＝．在Rt△ACD中，tan∠ACD＝，∴CD＝＝．∵BC＝CD﹣BD，∴﹣＝12．∴4x﹣x＝12．解这个方程，得x＝13．答：电子警察安装在悬臂灯杆上的高度AD的长为13m．24．（8分）如图，AB是⊙O的直径，且点C为⊙O上的一点，M是OA上一点，过M作AB的垂线交AC于点N，交BC的延长线于点E，作直线CF交EN于点F，且FE＝FC．（1）证明：CF是⊙O的切线；（2）设⊙O的半径为5，AC＝CE＝8，求线段MO的长．【解答】（1）证明：连接OC，∵AB是⊙O的直径，∴∠ACB＝90°，∴∠A+∠B＝90°，∴EM⊥AB，∴∠EMF＝90°，∴∠E+∠B＝90°，∴∠A＝∠E，∵EF＝CF，∴∠E＝∠ECF，∴∠ECF＝∠A，∴∠ECF+∠B＝90°，∵OC＝OB，∴∠B＝∠OCB，∴∠ECF+∠OCB＝90°，∴∠FCO＝90°，∴OC⊥CF，∴CF是⊙O的切线．（2）解：设MO为x，则BM为5+x，∵AC＝8，AB＝10，∴BC＝＝＝6，∵∠A＝∠E，∠ACB＝∠EMB，∴△ACB∽△EMB，∴＝，即＝，∴x＝3.4，∴MO＝3.4．25．（8分）某公司生产甲、乙两种产品，已知生产甲种产品每千克的成本费是30元，生产乙种产品每千克的成本费是20元，物价部门规定，这两种产品的销售单价（每千克的售价）之和为80元，经市场调研发现，甲种产品的销售单价为x（元），在公司规定30≤x ≤60的范围内，甲种产品的月销售量y1（千克）符合y1＝﹣2x+150，乙种产品的月销售量y2（千克）与它的销售单价成正比例，当乙产品单价为30元（即：80﹣x＝30）时，它的月销售量是30千克．（1）求y2与x之间的函数关系式；（2）公司怎样定价，可使月销售利润最大？最大月销售利润是多少？（销售利润＝销售额﹣生产成本费）（3）是否月销售额越大月销售利润也越大？请说明理由．【解答】解：（1）∵甲种产品的销售单价为x元，乙种产品的销售单价为（80﹣x）元，∴设y2与x之间的函数关系式y2＝k（80﹣x），∵当80﹣x＝30时，y2＝30，∴30＝30k，得k＝1，即y2与x之间的函数关系式y2＝80﹣x；（2）设月销售利润为w元，w＝（x﹣30）（﹣2x+150）+（80﹣x﹣20）（80﹣x）＝﹣（x﹣35）2+1525，∴x＝35时，w取得最大值，此时w＝1525，80﹣x＝45，∴甲种产品的销售单价定为35元，乙种产品的销售单价定为45元时，月销售利润最大，最大月销售利润是1525元．（3）不是月销售额越大月销售利润也越大，理由：设月销售额为z，z＝x（﹣2x+150）+（80﹣x）（80﹣x）＝﹣（x+5）2+6425，∴当x＞﹣5时，z随x的增大而减小，∴在公司规定30≤x≤60的范围内，当x＝30时，月销售额最大，而当x＝35时，月销售利润最大，所以不是月销售额越大月销售利润也越大．26．（9分）如图，在△ABC中．（1）如图1，∠C＝90°，∠A＝30°．sin30°＝；tan15°＝2﹣．（2）如图2，∠B＝2∠C，BC＝5，AC＝6．①求AB的长度．②P为AC上一点，以A、B、C中的两点及点P为顶点的三角形为等腰三角形，直接写出AP的长度．【解答】解：（1）∵∠C＝90°，∠A＝30°，设BC＝x，则AB＝2x，∴sin30°＝＝＝，如图1，延长CA至点D，使AD＝AB，连接BD，则∠BDA＝∠DBA＝15°，在Rt△ABC中，设BC＝x，则AC＝x，AB＝AD＝2x，CD＝AC+AD＝x+2x，在Rt△BCD中，tan∠BDC＝tan15°＝＝＝2﹣，故答案为：，2﹣．（2）①如图2，延长CB至点D，使得AB＝DB，则∠D＝∠DAB＝∠ABC＝∠C，∴∠ABD＝180°﹣2∠D，∠DAC＝180°﹣2∠D，∴∠DAC＝∠ABD，∴△ABD∽△CAD，∴，∵AB＝DB，BC＝5，AC＝AD＝6，∴，解得AB＝﹣9（舍去）或AB＝4，故AB的长为4．②以点A、B、P三点为顶点的△ABP中：（Ⅰ）当AP＝BP时，如图3所示，分别过点B、P作BD⊥AC，EP⊥AB，则AE＝BE，在Rt△ABD和Rt△BCD中，分别有：AB2﹣AD2＝BD2，BC2﹣CD2＝BD2，∴AB2﹣AD2＝BC2﹣CD2，即16﹣AD2＝25﹣（6﹣AD）2，解得AD＝，cos A＝，即，解得AP＝；（Ⅱ）当AB＝AP时，AP＝4；（Ⅲ）当AB＝BP时，如图4所示，过点B作BD⊥AC，垂直为点D，则AD＝DP＝AP，由（Ⅰ）可知AD＝，∴AP＝2AD＝；以点B、C、P三点为顶点的△BCP中：（Ⅰ）当BP＝CP时，如图5所示，分别过点A、P作AD⊥BC，PE⊥BC，垂足分别为点D、E，则BE＝CE＝BC＝，在Rt△ABD和Rt△ACD中，分别有：AB2﹣BD2＝AD2，AC2﹣CD2＝AD2，∴AB2﹣BD2＝CC2﹣CD2，即16﹣BD2＝36﹣（5﹣BD）2，解得BD＝，∴CD＝BC﹣BD＝，cos C＝，即，解得PC＝，∴AP＝AC﹣PC＝6﹣＝，（Ⅱ）当BC＝CP时，AP＝AC﹣PC＝6﹣5＝1，（Ⅲ）当BC＝BP时，如图6所示，点P在CA的延长线上，故不符合题意．综上所述，AP的长度为、4、、、1．27．（9分）已知二次函数y＝mx2+mx+n．（1）若图象经过点（0，2）．①n的值为2；②无论m为何值，图象一定经过另一个定点（﹣1，2）．（2）若图象与x轴只有1个公共点，求m与n的数量关系．（3）若该函数图象经过（1，3），写出函数图象与坐标轴的公共点个数及对应的m的取值范围．【解答】解：（1）①∵二次函数y＝mx2+mx+n经过点（0，2），∴n＝2，故答案为2；②当x＝﹣1时，y＝mx2+mx+2＝2，∴无论m为何值，图象一定经过另一个定点（﹣1，2），故答案为（﹣1，2）；（2）∵图象与x轴有1个公共点∴当y＝0时，方程mx2+mx+n＝0有两个相等的实数根，∴m≠0，且b2﹣4ac＝m2﹣4mn＝0，即m（m﹣4n）＝0，∴m﹣4n＝0，∴m＝4n；（3）∵函数图象经过（1，3），∴2m+n＝3，∴y＝mx2+mx+3﹣2m，∴△＝m2﹣4m（3﹣2m）＝m（9m﹣12），当图象与坐标轴有1个公共点时，△＝m（9m﹣12）＜0，则或，解得0＜m＜；当图象与坐标轴有2个公共点时，m（9m﹣12）＝0，解得m＝；当图象与坐标轴有3个公共点时，则或或，解得＜m＜或m＞或m＜0．。