2019-2020海淀区高三年级第一学期期中练习答案

海淀区高三年级第一学期期中练习语文 2019.11本试卷共8页,共150分。

考试时长150分钟。

考生务必将答案答在答题纸上,在试卷上作答无效。

考试结束后,将本试卷和答题纸一并交回。

一、本大题共6小题,共21分。

阅读下面的材料,完成1-6题。

材料一凤凰展翅,逐梦蓝天。

在新中国成立70周年之际,北京大兴国际机场正式投入运营。

平安机场、绿色机场、智慧机场、人文机场的建设标准,始终以旅客为中心的设计理念,再一次向世界展示了中国人民的智慧和力量,展示了中国开放包容的博大胸怀。

预计到2025年,70万平方米的大兴国际机场航站楼的年度旅客运输量将达7200万人次。

人流量巨大的交通建筑需要一定的空间高度,才能让旅客感到舒适。

大兴机场航站楼核心区18万平方米的屋面只用8根C型柱支撑主体结构。

8根C型柱合围形成了一个直径达180米、最大高差约30米的无柱圆形空间,这样的设计为旅客提供了最大化的公共空间。

C 型柱连接屋面的部分带有采光功能,保证了航站楼自然采光的均匀合理。

站在航站楼中心,通道没有任何遮挡,旅客可以清晰地找到自己想去的登机口,目测步行距离。

传统的线性构型航站楼从入口到登机口的步行距离很长。

大兴机场采用集中式多指廊构型,这种放射状的构型让旅客从航站楼中心到最远端登机口步行距离不超过600米。

这个数据在世界其他同规模的大型杋场中称得上翘楚。

为了便于旅客明晰自己的方位并快速找到登机口,五条指廊还分别采用不同的座椅颜色和标识牌,并通过对登机口进行不同的编号来实现区分。

在首都机场T1航站楼,国内出发旅客与到达旅客走在同一个楼层上,比较方便;但没有隔离廊分离且通道较窄,导致客流相对集中。

基于客流增大、航站楼规模扩大的情况,T2、T3机站楼采用分流模式,让双向的旅客各走各的通道,这样就保证了安全与秩序。

然而,分隔的空间需要更大的面积；“到达通道”的商业和配套设施较少,对于回程旅客来说不够友好。

大兴国际场航站楼国内旅客进出港的规划设计,汲取了首都机场三个航站楼的优点,又有效改进了它们的不足。

2019-2020学年北京市海淀区高三（上）期中化学试卷副标题题号一二三总分得分一、单选题（本大题共14小题，共42.0分）1.巴黎圣母院是全人类的宝贵文化遗产，下列在传承过程中遇到的问题与化学变化无关的是()A.石质阶梯被游客磨损B.石质雕像被酸雨腐蚀C.铜质雕像逐渐变为绿色D.木制中轴塔在火灾中坍塌A B C D【答案】A【解析】解：A.石质阶梯被游客磨损，过程中无新物质生成为物理变化，故A正确；B.石质雕像被酸雨腐蚀，是碳酸钙和酸反应，发生了化学反应属于化学变化，故B错误；C.铜质雕像逐渐变为绿色，是铜和空气中的氧气、二氧化碳、水蒸气反应生成铜绿，属于化学变化，故C错误；D.木制中轴塔在火灾中坍塌，是木材燃烧发生了化学反应，故D错误；故选：A。

物质变化过程中生成新物质的变化为化学变化，无新物质生成的变化为物理变化，据此分析判断。

本题考查了物质变化过程分析判断，主要是化学变化的实质理解应用，掌握基础是解题关键，题目难度不大。

2.下列做法的目的与改变化学反应速率无关的是()A. 牛奶在冰箱里保存B. 向玻璃中加入氧化铅C. 高炉炼铁前先将铁矿石粉碎D. 在糕点包装内放置小包除氧剂【答案】B【解析】解：A.降低温度，减缓食物变质的速率，故A不选；B.加有氧化铅的玻璃折光率高，与反应速率无关，故B选；C、高炉炼铁前先将铁矿石粉碎，增大接触面积加快化学反应速率，故C不选；D、在糕点包装内放置小包除氧剂，减慢糕点变质的速率，故D不选；故选：B。

改变反应物浓度、改变温度、改变反应物接触面积、改变压强(有气体参加或生成的反应)、催化剂都能改变化学反应速率，据此分析解答。

本题考查化学反应速率影响因素，侧重考查基础知识的灵活运用，明确外界条件对化学反应速率影响原理是解本题关键，题目难度不大。

3.下列关于铝及含铝物质的说法正确的是()A. 27Al的中子数为13B. 单质铝可用作半导体材料C. 原子半径r(Si)>r(Al)D. Al(OH)3能与NaOH溶液反应【答案】D【解析】解：A.Al的质子数为13，质子数+中子数=质量数，可知中子数为27−13=14，故A错误；B.Al为活泼金属，不能作半导体材料，故B错误；C.同周期从左向右原子半径减小，则原子半径r(Si)<r(Al)，故C错误；D.氢氧化铝为两性氢氧化物，则Al(OH)3能与NaOH溶液反应生成偏铝酸钠和水，故D 正确；故选：D。

海淀区高三年级第一学期期中练习数学（文科）2019.11本试卷共4页，150分。

考试时长120分钟。

考生务必将答案答在答题卡上，在试卷上作答无效。

考试结束后，将本试卷和答题卡一并交回。

一、选择题共8小题，每小题5分，共40分。

在每小题列出的四个选项中，选出符合题目要求的一项。

1．已知集合P{｜-≤0}，M{0,1,3,4}，则集合P M中元素的个数为A．1 B．2 C．3 D．42．下列函数中为偶函数的是A．B．|| C．D．3．在中，∠A60°，||2，||1，则的值为-1 A．B．-C．1 D．4．数列{}的前项和，若－2－1(≥2)，且3，则1的值为A．0 B．1 C．3 D．55．已知函数，下列结论中错误．．的是A．B．的最小正周期为C．的图象关于直线对称D．的值域为[,]6．“”是“”的A．充分不必要条件B．必要不充分条件C ．充分必要条件D ．既不充分也不必要条件7．如图，点O 为坐标原点，点A （1,1）.若函数（>0，且≠1）及（，且≠1）的图象与线段OA 分别交于点M ，N ，且M ，N 恰好是线段OA 的两个三等分点，则，满 足 A ．<<1 B ．<<1 C ．>>1 D ．>>18.已知函数()1,1,,11,1,1,x f x x x x -≤-⎧⎪=-<<-⎨⎪≥⎩，函数21()4g x ax =+.若函数()()y f x g x =-恰好有2个不同的零点，则实数a 的取值范围是 A.(0,)+∞ B.(,0)(2,)-∞+∞C.1(,)(1,)2-∞-+∞ D.(,0)(0,1)-∞s二、填空题共6小题，每小题5分，共30分。

9.函数()22x f x =-的定义域为_____. 10.若角α的终边过点（1，-2），则cos()2πα+=_____.11. 若等差数列{}n a 满足14a =-，39108a a a a +=-，则n a = ______.12.已知向量(1,0)a =，点()4,4A ，点B 为直线2y x =上一个动点.若AB //，则点B 的坐标为____.13.已知函数()sin()(0)f x x ωϕω=+>.若()f x 的图像向左平移3π个单位所得的图像与()f x 的图像重合，则ω的最小值为____.14.对于数列{}n a ，若m ∀，()n N m n *∈≠，均有()为常数m na a t t m n-≥-，则称数列{}n a 具有性质()P t .（i ）若数列{}n a 的通项公式为2n a n =，且具有性质()P t ，则t 的最大值为____；（ii ）若数列{}n a 的通项公式为2n aa n n=-，且具有性质(7)P ，则实数a 的取值范围是____.三、解答题共6小题，共80分。

2019-2020学年北京市海淀实验中学高三英语上学期期中考试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AWhen you grow up in Voss, outdoor adventures become a way of living. This is why visitors will find outdoor activities for all ages and levels. Many people get the impression that such activities as river sports, air sports and other extreme sports are only for the experts. Actually, you will find many outdoor adventures for those who simply want a taste of these elements in Voss.◆River KayakingThe river in Voss are great for river kayaking. If you are a beginner, we advise you to try an introduction course of 3 hours. A course of 2 days can be tested out if you really want to learn the sport of kayaking. Get a totally new experience with one of the best kayak centers inNorway.Prices From NOK 850 per person◆RaftingThe most popular summer activity in Voss. Thrilling, fun and suitable for beginners as well as those with experience! Includes transportation, safety instruction, swim test and about8kmof breathtaking rafting starting off in softer steams before getting on to the more exciting streams.Season Daily May—OctoberPrices From NOK 1,120Info All necessary equipment is provided. Please bring your own swimwear and towel.◆Bavallsekspressen Chair LiftExplore the mountain by riding the Bavallsekpressen chair lift all the way to the top to get immediate access to a great variety of hiking trails in beautiful scenery. The lift is also open for those who want to bring their bike or paraglider. Start and end: From Bavallen to Hangurstoppen.Season: Sat/Sun 24 June—06 August 12:00-16:00Prices Single trip: NOK 100 Day pass: NOK 250◆HusdyrparkenAt Husdyrparken, visitors get to experience Norwegian farm animals. You can participate in animal feedingand farm competitions, or simply relax with an organic ice cream in the café. You can also visit a small museum with old farming equipment.Season: Daily 18 June—21 AugustPrices: Adults NOK 120 Children NOK 60 Senior NOK 60Family Pass NOK 200 (For up to two adults and two kids)1. Who are the intended readers of the passage?A. Local residents.B. Professional athletes.C. Travel experts.D. Common Tourists.2. Which of the following activities provide instructions for beginners?A. River Kayaking and Rafting.B. Husdyrparken and River Kayaking.C. Rafting and Bavallsekspressen Chair Lift.D. Bavallsekspressen Chair Lift and Husdyrparken.3. How much should Jan pay for a farm trip with her little son and her mother in Voss?A. NOK 240.B. NOK 200.C. NOK 180.D. NOK 120.BThe health benefits of staying active are already well-known. It can help you manage weight, keep blood sugar levels down and reduce risk factors for heart disease.Now, a new study suggests that regularly playing sports, especially badminton or tennis, is not only healthy but also reduces your risk of death, at any age, by approximately 50%. This is a big scale population study to explore the health benefits of sports in terms of death rate. The study evaluated responses from 80, 306 adults aged 30 and above inEnglandandScotland, who were surveyed about their health, lifestyle and exercise patterns.After adjusting factors such as age, sex, weight, smoking habits, alcohol use, education and other forms of exercise besidesthe named sports, the researchers compared the risk of death among people who took part in a sport to those who didn’t. The percentage of reduced risk of death was found to be: 47% for racket（球拍）sports, 28% for swimming and 15% for cycling.In addition to this, the study didn’t find any significant reduction in the risk for sports like running and football. The findings also exposed that over 44% of the participants met the guidelines for the recommended exercise levels to stay fit and healthy, which amounts to 150 minutes of moderate(适度的) physical activity in a week.Does this mean you stop running or playing football and switch to tennis instead? Every kind of sport andphysical activity has different physical, social and mental benefits attached to it. The apparent lack of benefits of running and football could result from several variables that were not taken into account.Being active helps you feel happier and live longer. So, the most important step is to take part in any kind of sport that you are likely to enjoy and follow in the long term.4. How is the study conducted?A. By doing comparative experiments.B. By analyzing previous data.C. By evaluating survey information.D. By tracking participants for a long time.5. What does the underlined part “the named sports” refer to?A. Ball sports.B. Racket sports.C. Individual sports.D. Traditional sports.6. What can we infer from paragraph 5?A. Few people will play football.B. Tennis will become more popular.C. The result of this study is wrong.D. The study needs to be further improved.7. What does the author advise people to do?A. Stick to any sport that you like.B. Play badminton and tennis only.C. Stop running and playing football.D. Do any sport according to guidelines.CThose who are concerned that robots are taking over the world can rest easy—for now. Though the androids have proved useful at performing ordinary tasks, they are not ready for the greatest time. At least that appears to be the case atJapan’s Henn-na Hotel chain where over half of the robot staff are being replaced by humans.The first location of the unique hotel opened in July 2015 was atNagasaki’s Huis Ten Bosch Theme Park. The hotel’s owner, Hideo Sawada, promised the hotel to be managed primarily by robots. Guests were greeted and checked-in by a dinosaur robot, while a cute android called Churi, placed inside each room, provided information about attractions. Not surprisingly, the lodging, recognized in 2016 as the world’s first robot-staffed hotel by Guinness World Records, drew in curious visitors from all around the world.But as the years have passed, the hotel’s main draw is becoming less novel and more unsatisfactory. Also as the robots are “aging”, they are costing more to repair. Among the 283 androids being replaced are the chain’s two dinosaur receptionists. In addition to scaring young guests, they are also unable to photocopy guests’ passports, forcing human employees to step in each time. Also out are the cute Churi robots, which annoyed guests by interrupting their conversations. For example, one guest told The Wall Street Journal that Churi mistook hissnoring for a command and kept asking him to repeat his request all night.Sawada told The Wall Street Journal, “When you actually use robots you realize there are places where they aren’t needed—or just annoy people.” While Sawada may be cutting back on his use of androids, the recently-opened Smart LYZ Hotel and the Fly Zoo Hotel inChina, are run entirely by robots, with not a human in sight. Whether the employees have more competence than those “hired” by the Henn-na Hotel chain remains to be seen.8. What makesJapan’s Henn-na Hotel unique?A. Its robot employees.B. Its advanced equipment.C. Its convenient location.D. Its successful management.9. What is the author’s purpose with the example in paragraph 3?A. To entertain readers.B. To prove Churi’s drawback.C. To introduce Churi’s functions.D. To persuade people not to book the hotel.10. What does the owner ofJapan’s Henn-na Hotel think of his robot staff now?A. Attractive.B. Costly.C. Pioneering.D. Disappointing.11. What is the best title for the text?A. Robots Are Taking Over the World.B. The Boom of Robots-staffed Hotel.C. Robot Staff Are Fired For No Competence.D. The First Robots-staffed Hotel Won Guinness World Record.DMany teens may feel anxious sometimes. It’s the kind of nervousness that makes you bite your nails before a big test. We spend more time online than we should. We feel good about ourselves or bad based on how many Likes and Followers we get on social media. Young people are developing a false view of life.On the screen, we see what people want to show us. People usually only post photos where they are looking their best. They are surrounded by friends and seem that they are having a great time. No one seems sad or lonely. In short, life isfabulous. But sooner or later, our young people compare their real life to it. They find that theirs doesn’t seem as fun or exciting and grow worried that they may be missing out.No wonder teachers are reporting more anxious students. It’s reported that a lot more college students feel ―overwhelming anxiety. The percentage jumped from 50% in 2011 to 62% in 2016. Anxiety is now the most common mental-health problem in my country. It affects nearly one-third of teens and adults.Certainly, we can’t blame it on social media alone. We expect toomuch from our children and a lot of these expectations aren’t reasonable. Their schedules are packed with sports, clubs and homework. They don’t have enough free time. We want our children to succeed, and we don’t care how much it costs.As parents, we must have more balance. On one hand, we push too hard, and on the other hand, we make life too easy for children. We shouldn’t and can’t promise our children that they will always be happy. We shouldn’t try to protect them from the problems of everyday life. Let them solve the problems in person.12. What is the text mainly about?A. What causes teens’ nervousness.B. How to deal with teens’ anxiety.C. What a view of life means to people.D. How to treat social media appropriately.13. What does the underlined word “fabulous” in paragraph 2 mean?A. Wonderful.B. Encouraging.C. Anxious.D. Doubtful.14. Why does the author mention the numbers in paragraph 3?A. To draw teachers’ attention.B. To show teachers’ mental problems.C. To present the seriousness of teens’ anxiety.D. To show adults have more problems than teens.15. What should parents do to help their children out?A. Try to meet their expectations.B. Help them with their homework.C. Give them more free time to play sports.D. Allow them to solve their own problems in life.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。

海淀区高三年级第一学期期中练习语文2019．11一、本大题共8小题，共24分阅读下面材料，完成1—8题。

材料一“三山五园”是对三山五园是对北京西郊皇家园林的总称，这种说法出现于清朝中晚期。

“三山五园”包括香山静宜园、玉泉山静明园、万寿山清漪园（颐和园）、畅春园和圆明园。

静宜园位于地势较高的香山，园中建筑因山就势，参差错落，散点式镶嵌在山体之中。

“园林之胜，重在山水。

”水池作为点缀，或出现在殿前以丰富较窄的院落空间，或处于园中以增加园林趣味。

静宜园占地149公顷，1677年成为康熙的行宫，后来虽有添建，但一直保持着非常好的自然生态，深邃优雅。

静明园的个性与静宜园不同。

静明园所在的玉泉山，湖山尺度非常有限，占地仅65公顷。

玉泉山虽因泉水丰沛而得名，但水面并不大，山体狭长，呈南北走向。

在这种地形上如何建设园林呢？建筑要和湖山尺度配合好，建筑群采用散点布局，高低相映。

山顶上的香岩寺和玉峰塔规模不大，山脚下的建筑多一层。

这样就凸显出玉峰塔的高耸。

乾隆非常喜欢玉泉山的风光，亲自为静明园内十六景命名，正殿名为“廓然大公”，后殿名为“涵万象”，意蕴深远。

畅春园位于今北京大学西墙外畅春园宿舍一带，原是明代武清侯李伟修建的私家园林“清华园”，也叫“李园”，康熙时更名为畅春园。

畅春园以水景为主，水面宽阔，“江淮以北亦当第一也”，清朝改建时仍“因水成景”。

畅春园的叠山艺术也堪称一绝，原来的土山和新添建的假山，岗峰连接；加之遍植各色鲜花树木，绿树成荫，给人天人合一之感，是兼有政治和游乐功能的离宫型园林。

被称为“万园之园”的圆明园，既有金碧辉煌的宫殿，也有玲珑剔透的亭台楼阁，又吸取了欧洲的建筑形式，是世界园林的集大成者。

圆明园也是中国古典园林中平地造园的典范，园内步移景易，景观层出不穷，特色之多，首屈一指．．．．。

圆明园占地350公顷，在“三山五园”中规模最大。

有仙境、欧式园林等景观，也有理政、居住、宗教等场所，这些层峦叠嶂．．．．的建筑都是雍正至咸丰五朝皇帝改造的结果，也大多体现出其治国理念。

北京市海淀区2019-2020学年高三上学期期中物理试卷一、单选题（本大题共3小题，共9.0分）1.在高度为H的桌面是以速度v水平抛出质量为m的物体，当物体落到距地面高为h处的A点时，如图所示，不计空气阻力，选地面为零势能面，下列说法正确的是()mv2+mgℎA. 物体在A点的机械能为12mv2+mgHB. 物体在A点的机械能为12mv2+mgℎC. 物体在A点的动能为12mv2+mgHD. 物体在A点的动能为122.如图所示，轻弹簧的两端各受10N拉力F作用，弹簧平衡时伸长了5cm(在弹性限度内)，那么下列说法中正确的是()A. 该弹簧的劲度系数k=200N/mB. 该弹簧的劲度系数k=400N/mC. 根据公式k=F，弹簧的劲度系数k会随弹簧弹力F的增大而增大xD. 弹簧所受的合力为10N3.如图所示，弹簧振子沿x轴在B、C之间做简谐运动，O为平衡位置，当振子从B点向O点运动经过点P时()A. 振子的位移为负B. 振子的加速度为负C. 振子的速度为负D. 振子的回复力为负二、多选题（本大题共7小题，共21.0分）4.如图所示，在距地面一定高度的同一点A处，三次水平抛射皮球(视为质点)均能击中水平地面上的同一目标(目标在A点右方)。

第一次在无风情况下以v1水平抛出；第二次在有水平向右的风力作用下以v2水平抛出；第三次在有水平向左的风力作用下以v3水平抛出。

则下列说法中正确的是()A. 三次下落时间相等B. 三次抛射的水平初速度v2>v1>v3C. 皮球三次运动的位移方向不同D. 击中目标时的速度方向不同5.质量为1.0kg的物体以某初速度在水平面上滑行，由于摩擦阻力的作用，其动能随位移变化的情况如图所示，则下列判断正确的是(g取10m/s2)()A. 物体与水平面间的动摩擦因数为0.30B. 物体与水平面间的动摩擦因数为0.25C. 物体滑行的总时间为2.0sD. 物体滑行的总时间为4.0s6.如图所示，A球用线悬挂且通过弹簧与B球相连，两球质量相等．当两球都静止时，将悬线烧断，下列说法正确的是()A. 线断瞬间，A球的加速度大于B球的加速度B. 线断后最初一段时间里，重力势能转化为动能和弹性势能C. 在下落过程中，两小球、弹簧和地球组成的系统机械能守恒D. 线断后最初一段时间里，动能的增加大于重力势能的减少7.如图所示光滑管形圆轨道半径为R(管径远小于R)，小球a、b大小相同，质量均为m，其直径略小于管径，能在管中无摩擦运动．两球先后以相同速度v通过轨道最低点，且当小球a在最低点时，小球b在最高点，以下说法正确的是()A. 当小球b在最高点对轨道无压力时，小球a比小球b所需向心力大5 mgB. 当v=√5gR时，小球b在轨道最高点对轨道无压力C. 速度v至少为√5gR，才能使两球在管内做圆周运动D. 只要v≥√5gR，小球a对轨道最低点的压力比小球b对轨道最高点的压力都大6 mg8.如图所示，表示横波在某一时刻的图像，其波速是8m/s，则下列说法中正确的是()A. 该波的周期为0.5sB. 该波的振幅是5mC. 从这一时刻开始经过1.75s，质点a经过的路程是70cmD. 从这一刻开始经过1.75s，质点a向右移动的距离为14m9.两个相同的小车放在光滑水平板上，前端各系一条细绳，绳的另一端跨过定滑轮各挂一个小盘，盘中可放砝码(如图甲所示).小盘和砝码所受的重力，等于使小车做匀加速运动的力．因此增减小盘中的砝码就可以改变小车的受到的合力．两个小车后端各系一条细线，用一个黑板擦把两条细线同时按在桌上，使小车静止(如图乙所示).抬起黑板擦，两个小车同时运动，按下黑板擦两个小车同时停下来．若小车1和小车2所受拉力分别为F1、F2，车分别为m1、m2，抬起再按下黑板擦则得两车的位移分别x1、x2，则在实验误差允许的范围内，有()A. 当m1=m2、F1=2F2时，x1=2x2B. 当m1=m2、F1=2F2时，x2=2x1C. 当m1=2m2、F1=F2时，x1=2x2D. 当m1=2m2、F1=F2时，x2=2x110.关于匀速圆周运动的向心力，下列说法正确的是()A. 向心力是使物体做圆周运动的力，是根据力的作用效果命名的B. 向心力可以是多个力的合力，也可以是其中一个力或一个力的分力C. 对稳定的圆周运动，向心力是一个恒力D. 向心力的效果是改变质点的线速度大小三、实验题（本大题共2小题，共15.0分）11.某校物理探究实验小组，使用50Hz交流电，利用打点计时器打出的一条纸带如图所示，A、B、C、D、E为我们在纸带上所选的计数点，每相邻的两个计数点之间有4个计时点未画出，则：(1)相邻计数点间的时间间隔为______s；(2)根据纸带上所测得数据，打点计时器打下C点时小车的瞬时速度v c=______m/s；(计算结果保留两位有效数字)(3)小车的加速度a=______m/s2.(计算结果保留两位有效数字)12.如图所示为改装的探究圆周运动中向心加速度的实验装置。

海淀区高三年级第一学期期中 物 理 2019.11.5一、本题共10小题，每小题3分，共30分。

在每小题给出的四个选项中，有的小题只有一个选项是正确的，有的小题有多个选项是正确的。

全部选对的得3分，选不全的得2分，有选错或不答的得0分。

把正确的答案填涂在答题纸上。

1．在距水平地面附近一定高度处将一物体水平抛出，物体最终落到水平地面上。

若空气阻力可忽略不计，下列说法中正确的是A ．物体沿水平方向的分运动是匀变速直线运动B ．物体落至水平地面上的速度与抛出时的初速度无关C ．物体在空中运动的时间与抛出时的初速度无关D ．物体在空中运动过程中的机械能不断增大2．在研究共点力平衡条件的实验中，用三个弹簧测力计通过轻软线对同一个小圆环施加水平拉力作用，三个拉力的方向如图1所示，如果小圆环可视为质点，且其所受重力可忽略不计，小圆环平衡时三个弹簧测力计的示数分别为F 1、F 2和F 3，关于这三个力的大小关系，下列说法中正确的是A ．F 1>F 2>F 3B ．F 3>F 1>F 2C ．F 2>F 3>F 1D ．F 3> F 2>F 1 3．如图2所示，车厢内的后部有一相对车厢静止的乘客，车厢内的前部有一小球用细线悬挂在车厢的天花板上，小球与车厢一起沿平直轨道以速度v 匀速前进。

某时刻细线突然断裂，小球落向车厢底板，这一过程中车厢始终以速度v 匀速前进。

若空气阻力可忽略不计，对于小球从线断裂至落到车厢底板上之前的运动，下列说法中正确的是A ．相对于乘客，小球做自由落体运动B ．相对于乘客，小球的运动轨迹为斜向前的直线C ．相对于地面，小球的运动轨迹为抛物线D ．相对于地面，小球做自由落体运动4.雨滴在空中下落的过程中，空气对它的阻力随其下落速度的增大而增大。

若雨滴下落过程中其质量的变化及初速度的大小均可忽略不计，以地面为重力势能的零参考面。

从雨滴开始下落时计时，关于雨滴下落过程中其速度的大小v 、重力势能E p 随时间变化的情况，如图3所示的图像中可能正确的是5．如图4所示， 在A 、B 两物体间有一与物体不连接的轻质弹簧，两物体用轻细线连接在一起并使弹簧处于压缩状态，整体静止在光滑水平面上。

2019-2020学年北京市海淀区高三（上）期中数学试卷一、选择题：本大题共8小题，每小题5分，共40分．在每小题列出的四个选项中，选出符合题目要求的一项．1．（5分）已知集合{|10}A x x =+，{|}B x x a =，若A B R =，则实数a 的值可以为( )A ．2B ．1C ．0D ．2−2．（5分）下列函数中，在区间(0,)+∞上不是单调函数的是( )A ．y x=B ．2y x =C ．y x x=+D ．|1|y x =− 3．（5分）已知等差数列{}n a 的前n 项和为n S ，若33S a =，且30a ≠，则43(S S = ) A ．1 B ．53C ．83D ．34．（5分）不等式11x>成立的一个充分不必要条件是( ) A ．102x <<B ．1x >C ．01x <<D ．0x <5．（5分）如图，角α以Ox 为始边，它的终边与单位圆O 相交于点P ，且点P 的横坐标为35，则sin()2πα+的值为( )A ．35−B ．35C ．45−D ．456．（5分）在四边形ABCD 中，//AB CD ，设(,)AC AB AD R λμλμ=+∈．若32λμ+=，则||(||CD AB = ) A ．13B ．12C ．1D ．27．（5分）已知函数32()2||f x x x x k =+−−．若存在实数0x ，使得00()()f x f x −=−成立，则实数k 的取值范围是( ) A ．[1−，)+∞B ．(−∞，1]−C ．[0，)+∞D ．(−∞，0]8．（5分）设集合A 是集合*N 的子集，对于*i N ∈，定义1,()0,i i AA i A ϕ∈⎧=⎨∉⎩，给出下列三个结论：①存在*N 的两个不同子集A ，B ，使得任意*i N ∈都满足()0i A B ϕ=且()1i AB ϕ=；②任取*N 的两个不同子集A ，B ，对任意*i N ∈都有()i i A B ϕϕ=（A ）i ϕ⋅（B ）；③任取*N 的两个不同子集A ，B ，对任意*i N ∈都有()i i A B ϕϕ=（A ）i ϕ+（B ）．其中，所有正确结论的序号是( ) A ．①②B ．②③C ．①③D ．①②③二、填空题：本大题共6小题，每小题5分，共30分． 9．（5分）已知向量(1,2)a =，(3,)b t =，且//a b ，则t = ． 10．（5分）函数()6f x x x =−−的零点个数是 ．11．（5分）已知数列{}n a 的前n 项和为2log n S n =，则1a = ，5678a a a a +++= ．12．（5分）如图，网格纸上小正方形的边长为1．从A ，B ，C ，D 四点中任取两个点作为向量b 的始点和终点，则a b ⋅的最大值为 ．13．（5分）已知数列{}n a 的通项公式为n a lnn =，若存在p R ∈，使得n a pn 对任意的*n N ∈都成立，则p 的取值范围为14．（5分）已知函数()2f x x ω=，()2g x x ω=，其中0ω>，A ，B ，C 是这两个函数图象的交点，且不共线．①当1ω=时，ABC ∆面积的最小值为 ；②若存在ABC ∆是等腰直角三角形，则ω的最小值为 ．三、解答题：本大题共6小题，共80分．解答应写出文字说明，演算步骤或证明过程． 15．（13分）已知数列{}n a 为各项均未正数的等比数列，n S 为其前n 项和，23a =，3436a a += （Ⅰ）求数列{}n a 的通项公式； （Ⅱ）若121n S <，求n 的最大值．16．（13分）已知函数()2sin cos()3f x x x π=+．（Ⅰ）求函数()f x 的最小正周期；（Ⅱ）若()0f x m +对[0,]2x π∈恒成立，求实数m 的取值范围．17．（13分）已知函数321()3f x ax x bx c =+++，曲线()y f x =在(0，(0))f 处的切线方程为1y x =+．（Ⅰ）求b ，c 的值；（Ⅱ）若函数()f x 存在极大值，求a 的取值范围．18．（13分）在ABC ∆中，7a =，5b =，8c =． （Ⅰ）求sin A 的值；（Ⅱ）若点P 为射线AB 上的一个动点（与点A 不重合），设APk PC=． ①求k 的取值范围；②直接写出一个k 的值，满足：存在两个不同位置的点P ，使得APk PC =．19．（14分）已知函数()xlnxf x e =． （Ⅰ）判断函数()f x 在区间(0,1)上的单调性，并说明理由； （Ⅱ）求证：1()2f x <．20．（14分）已知集合*M N ⊆，且M 中的元素个数n 大于等于5．若集合M 中存在四个不同的元素a ，b ，c ，d ，使得a b c d +=+，则称集合M 是“关联的”，并称集合{a ，b ，c ，}d 是集合M 的“关联子集”；若集合M 不存在“关联子集”，则称集合M 是“独立的”．（Ⅰ）分别判断集合{2，4，6，8，10}和集合{1，2，3，5，8}是“关联的”还是“独立的”？若是“关联的”，写出其所有的关联子集；（Ⅱ）已知集合1{a ，2a ，3a ，4a ，5}a 是“关联的”，且任取集合{i a ，}j a M ⊆，总存在M 的关联子集A ，使得{i a ，}j a A ⊆．若12345a a a a a <<<<，求证：1a ，2a ，3a ，4a ，5a 是等差数列；（Ⅲ）集合M 是“独立的”，求证：存在x M ∈，使得294n n x −+>．。

海淀区高三年级第一学期期中练习数 学 2019.11本试卷共4页，150分。

考试时长120分钟。

考生务必将答案答在答题纸上，在试卷上作答无效。

考试结束后，将本试卷和答题卡一并交回。

第一部分（选择题 共40分）一、选择题共8小题，每小题5分，共40分。

在每小题列出的四个选项中，选出符合题目要求的一项。

（1）已知集合{|10}A x x =+≤，{|}B x x a =≥. 若A B =R ，则实数a 的值可以为（A ）2 （B ）1 （C ）0（D ）2-（2）下列函数中，在区间(0,)+∞上不是．．单调函数的是 （A ）y x = （B ）2y x =（C）y x =（D ）|1|y x =-（3）已知等差数列{}n a 的前n 项和为n S . 若33S a =，且30a ≠，则43S S = （A ）1 （B ）53（C ）83（D ）3（4）不等式11x>成立的一个充分不必要条件是 （A ）102x <<（B ）1x > （C ）01x <<（D ）0x <（5）如图，角α以Ox 为始边，它的终边与单位圆O 相交于点P点P 的横坐标为35，则sin()2απ+的值为 （A ）35-（B ）35（C ）45-（D ）45（6）在四边形ABCD 中，AB ∥CD ， AC AB AD λμ=+(λ，)μ∈R . 若λμ+=32， 则||||CD AB = （A ）13（B ）12（C ）1 （D ）2（7）已知函数()322f x x x x k =+--. 若存在实数0x ，使得00()()f x f x -=-成立，则实数k 的取值范围是 （A ）[1,)-+∞ （B ）(,1]-∞- （C ）[0,)+∞（D ）(,0]-∞（8）设集合A 是集合*N 的子集，对于i ∈*N ，定义1, ,()0, .i i A A i A ϕ∈⎧=⎨∉⎩给出下列三个结论：①存在*N 的两个不同子集A ，B ，使得任意i ∈*N 都满足()0i AB ϕ=且()1i A B ϕ=；②任取*N 的两个不同子集A ，B ，对任意i ∈*N 都有()()()i i i A B A B ϕϕϕ=⋅； ③任取*N 的两个不同子集A ，B ，对任意i ∈*N 都有()()()i i i A B A B ϕϕϕ=+.其中所有正确结论的序号是 （A ）①② （B ）②③ （C ）①③（D ）①②③第二部分（非选择题 共110分）二、填空题共6小题，每小题5分，共30分。

2019-2020学年北京市海淀区高三（上）期中数学试卷一、选择题（本大题共8小题，共40.0分）1. 设集合A ={x|−5≤x <1}，B ={x|x ≤2}，则A ∪B =( )A. {x|x ≤2}B. {x|−5≤x <1}C. {x|−5≤x ≤2}D. {x|x <1}2. 下列函数中，在(−∞,0)上单调递减的是( )A. y =xx+1 B. y =1−xC. y =x 2+xD. y =1−x 23. 已知等差数列{a n }的前n 项和为S n ，a 10=15，且S 2=S 7，则a 8=( )A. 6B. 7C. 8D. 9 4. 不等式x 2−2x −3<0成立的一个充分不必要条件是 ( )A. (−1,3)B. (−2,0)C. (−12,32)D. (−1,4)5. 设角α的终边与单位圆相交于点P(−35,45)，则sinα−cosα的值是( )A. −75B. −15C. 15 D. 756. 在梯形ABCD 中，DC ⃗⃗⃗⃗⃗ =2AB ⃗⃗⃗⃗⃗ =4PC ⃗⃗⃗⃗⃗ ，且AP ⃗⃗⃗⃗⃗ =λAB ⃗⃗⃗⃗⃗ +μAD⃗⃗⃗⃗⃗⃗ ，则λ+μ的值为( )A. 1B. 2C. 52D. 37. 已知函数f(x)={x 2−x +3,x ⩽1x +2x ,x >1，设a ∈R ，若关于x 的方程f(x)=a|x −1|有且仅有一个实数解，则a 的取值范围是( )A. (1,3)B. (2√6−4,3)C. (1,2√3−1)D. (2√6−4,2√3−1)8. 设集合A ={a, b}，集合，若A ∩B ={0}，则A ∪B 等于( )A. {−1,0,3}B. {−2,0,3}C. {0,3,4}D. {1,0,3}二、填空题（本大题共6小题，共30.0分）9. 若向量a ⃗ =(1,k)，b ⃗ =(−2,6)，且a ⃗ //b ⃗ ，则实数k = ______ ． 10. 已知函数f(x)={x(x +4),x <0,x(x −4),x ≥0,则该函数的零点的个数为________．11. 若数列{a n }的前n 项和为S n =log 3(n +1)，则a 5=_________．12. 已知两个单位向量a ⃗ 和b ⃗ 的夹角为120°，则a ⃗ +b ⃗ 在b ⃗ 方向上的投影为___________．13.若函数f(x)=x+a2x , g(x)=x−lnx，对任意x1∈[1e,1]，存在x2∈[1e,1],使得g(x1)≤f(x2)成立，则实数a的取值范围是________．14.已知ω>0，函数f(x)=cos(ωx−π3)过点(π2,0)，则ω的最小值为________．三、解答题（本大题共6小题，共80.0分）15.已知等比数列{a n}的各项均为正数，且6a2，1，4a1成等差数列，3a6，a3，3a2成等比数列．(1)求数列{a n}的通项公式；(2)已知b n=log31a n，记c n=a n⋅b n，求数列{c n}的前n项和S n．16.已知函数f(x)=cos4x−2sinxcosx−sin4x.(1)求f(x)的最小正周期。

2019-2020学年北京市海淀实验中学高三英语上学期期中考试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ATheatre reflects the values of the civilization out of which it grows. The following are the types of theatre performances an ancient Roman might have witnessed then.Fescennine VerseFescennine Verse was a pioneer of Roman comedy. Ironic and improvisational（即兴的）, it was used mainly at festivals or weddings, and as invective. With early native Italian funny dialogues in Latin verse, it was thought to have combined with a tradition of performances by masked dancers and musicians from Etruria.Fabula AtellanaFabula Atellana relied on common characters, masks, direct humor, and simple plots. They were performed by actors improvising. Fabula Atellana came from the Oscan city of Atella. There were 4 main types of characters: the braggart, the greedy blockhead, the clever hunchback and the stupid old man, like modern Punch and Judy shows.Fabula TogataNamed for the clothing symbolic of the Roman people Fabula Togata had various subtypes. One was the Fabula Tabernaria, named for the tavern（酒馆）where the comedy’s preferred characters, lowlifes, might be found. One describing more middle-class types, and continuing the Roman clothing theme, was the Fabula Trabeata.Fabula PraetextaFabula Praetexta is the name for Roman tragedies on Roman themes, Roman history or current politics. Fabula Praetexta was less popular than tragedies on Greek themes. During the Golden Age of drama in the Middle Republic, there were four great Roman writers of tragedy, Naevius, Ennius, Pacuvius, and Accius. Of their surviving tragedies, 90 titles remain.All the performances above began as a translation of Greek forms, even to the extent of their being performed in Greek costume.1.Where might an ancient Roman witness Fescennine Verse?A.At a party.B.At a funeral.C.At a wedding.D.At a concert.2.Which type of performance describes the middle-class life?A.Fabula Atellana.B.Fabula Tabernaria.C.Fabula Trabeata.D.Fabula Praetexta.3.What do the listed types of performances have in common?A.They copy Latin dramas.B.They take on Greek forms.C.They reflect Roman themes.D.They refer to Italian stories.BFor decades, an organization, called Ulum Dalska, based in a small Swedish town called Alvdalen, hasbeen working hard to help save a language called EIfdalian. Elfdalian sounds nothing like the country's national language, Swedish, which press secretary Bjorm Rehnstrom said affected the language about 100 years ago. At that point, Elfdalian declined. Ulla Schitt, also a Ulum Dalska member, experienced the change while growing up in Alvdalen.“My parents spoke Efdalian with each other, and with my grandma and my aunts and uncles and everyone around,”Schit said. “But when they turned to me, they spoke Swedish.” Schitt said her parents spoke Swedish with her because that's what was spoken in schools.But people are getting creative in the fight to change that trend. Musicians are creating new songs with Elfdalian. Several children's books were also translated into EIfdalian, including Le Petit Prince by Antoine de Saint-Exupery. Additionally, Bjorm Rehnstrom helps run a popular Facebook group that offers courses in the Elfdalian language, where he offers lessons to the group's 1,800 global members from America, Australia, South America, Indonesia, Haiti and Cape Verde.The local government supports the teaching and preservation of Elfdalian. Bjom Rehnstrom said they eagerly paid for a sign that reads: “Welcome to Alvdalen” in Elfdalian. But the national government of Sweden is a different story. They currently consider Eidalian a dialect of Swedish, not its own language.Schitt said every time a language dies it is a sad moment. To her, losing Elfdalian would be an especially tragic (悲剧的) loss. “It's a part of our identity. It's part of our culture,” she said. “And if part of your identity and culture dies, a part of yourself dies.” Getting Elfdalian recognized as a language by the Swedish government, she added, is key to making sure that death doesn't come.4. Why was Ulum Dalska founded?A. To teach Swedish.B. To save Elfdalian.C. To improve Alvdalen.D. To help schools.5. Why Schitt's parents spoke Swedish with her?A. They could only speak Swedish fluently.B. Schitt longed to speak Swedish at home.C. Swedish was the language of schools.D. It was required by her school teachers,6. What can we infer from paragraph 4?A. Many people are trying to help to save Elfdalian.B. Songs in Elfdalian are becoming more popular.C. Le Petit Prince was translated into various languages.D. Courses in Eldalian are provided to the world freely.7. What does Schitt think of preserving Elfdalian?A. Satisfactory.B. Vital.C. Dangerous.D. Meaningless.CAs is commonly known,Antarcticais an icy continent with extreme environment. However, a new study provides evidence that the area had a rainforest in the past.The researchers collected a piece of Earth sediment from under the seafloor off the coast ofAntarctica. In the sediment, they discovered forest material that was estimated to be about 90 million years old. At that period, dinosaurs were the ruler animals of the land.Johann Klages, a German geologist, was the lead writer of a study on the findings, published in the journalNature. He said the sediment was collected from a depth of about 30 meters below the ocean floor. Klages said an examination showed that the material didn’t form in the ocean.The researchers estimate that the area — about 900 kilometers from the South Pole — had average yearly temperatures of about12°Cto13°C. The soil included fine dirt particles and hard clay, as well as substances linked to at least 65 different kinds of plants, the study found. Although no animal remains were found, Klages said there were likely dinosaurs, flying reptiles and many insects in the environment.The research represents new evidence of the major climate changes Earth experienced in the past — and is currently undergoing today. The soil in the sediment dates back to the planet’s warmest period of the past 140 million years, with sea level about 170 meters higher than today. The researchers said that the rainforest environment inAntarcticawas especially surprising because each year, the area experiences a four-month polar night when there is no sunlight to fuel plant life. Klages said no ice sheets were present during the time, but seasonal snowfall was likely.8. What can we learn about the sediment collected?A. It formed in the age of dinosaurs.B. It was found on theAntarcticaland.C. Ancient forest material was found in it.D. Some dinosaur remains were found in it.9. How did the researchers reach their findings?A. By analyzing the Earth sediment.B. By exploring ice inAntarctica.C. By collecting data on climate.D. By researching special plants.10. What can be indicated in the last paragraph?A. Seasonal snowfall made the forest disappear.B. Antarctica was much colder 140 million years ago.C. Antarctica’s natural environment has changed greatly.D. Polar nights inAntarcticaare getting shorter than before.11. What is the main idea of the text?A. Rainforest disappeared fromAntarctica.B. Antarctica had a different history of climate.C. Researchers studied a piece of Earth sediment ofAntarctica.D.Antarcticahad an extreme environment containing ice and snow.DTo stay healthy and fit, Chinesestudents do group exercises every day at school. Most of you probably do the same set of exercises. But some school exercises have grown popular online due to their local and innovative designs.Singing in Sichuan dialects with energetic movements and unique mask-changing is not just a Sichuan Opera performance. It’s the routine exercise for students of Mianyang Foreign Languages Experimental School in Sichuan province.“Sichuan Opera is a local opera, and it is now facing a gap in inheritance (传承). Therefore, we cooperated with Mianyang Intangible Cultural Heritage Center to create a simple and easy-to-learn Sichuan Opera exercise,” said Shen Junhua, who is in charge of organizing the school’s exercise between classes.According to Shen, this new type of exercise has been practiced since 2017 and has been popular among students. When students enroll (入学), they will spend several weeks practicing it. At present, almost all of the students and teachers have mastered it.“In fact, we had hardly heard of Sichuan Opera before teachers taught us how to do the Sichuan Operaexercise,” said Li Yangwenwen, 14, an eighth grade student who also joined the school’s Sichuan Opera club out of interest. “It’s very different from normal exercises. After practicing it, we found it very beautiful and became interested in it. Now, almost all of the students look forward to our daily exercise time and feel excited to do it.”“By combining opera with daily exercise, the daily class activity allows students to perceive and understand Sichuan Opera’s culture”, Shen said. “After years of continuous effort to spread the seeds of traditional culture, the younger generation is finally catching on.”12. What do students in Shen’s school do during the group exercise?A. They do normal exercise .B. They sing pop songs in Sichuan dialects.C. They do mask-changing in a Sichuan Opera performance.D. They combine group exercise with Sichuan Opera.13. Why do they adopt the new type of exercise?A. To attract new students to the school.B. To inherit local culture.C. To create an easy-to-learn exercise.D. To make the school’s group exercise popular.14. How do teachers and students react to the group exercise?A. Calm.B. Indifferent.C. Enthusiastic.D. Uninterested.15. What can we learn from the last paragraph?A. Shen’s continuous effort is highly praised.B. The younger generation will have a stronger body.C. The students can better understand their local culture.D. Students help to spread the seeds of traditional culture toyounger generation.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。

北京市海淀区2019-2020学年高三上学期期中物理试卷一、单选题（本大题共3小题，共9.0分）1.在高度为丹的桌而是以速度v水平抛出质量为加的物体，当物体落到距地而髙为力处的A点时,如图所示，不计空气阻力，选地而为零势能而，下列说法正确的是（）A.物体在A点的机械能为如沪+ mghB.物体在A点的机械能为:mu? + mgHC.物体在A点的动能为右mu? + mghD.物体在A点的动能为寸加沪+mgH2.如图所示，轻弹簧的两端各受10 N拉力F作用，弹簧平衡时伸长了5 m（在弹性限度内），那么下列说法中正确的是（）A.该弹簧的劲度系数k = 200 N加B.该弹簧的劲度系数k = 400 N/mC•根据公式k = -9弹簧的劲度系数£会随弹簧弹力F的增大而增大XD.弹簧所受的合力为10 N3.如图所示，弹簧振子沿x轴在B、C之间做简谐运动，O为平衡位置，当振子从B点向O点运动经过点户时（）• .. ..B P OC 才A.振子的位移为负B.振子的加速度为负C.振子的速度为负D.振子的回复力为负二' 多选题（本大题共7小题，共21.0分）4.如图所示，在距地面一左高度的同一点A处，三次水平抛射皮球（视为质点）均能击中水平地而上的同一目标（目标在A点右方）。

第一次在无风情况下以巾水平抛出；第二次在有水平向右的风力作用下以％水平抛出；第三次在有水平向左的风力作用下以巾水平抛岀。

则下列说法中正确的是（）A. 三次下落时间相等B. 三次抛射的水平初速度巾 > 巾 > 巾C. 皮球三次运动的位移方向不同D. 击中目标时的速度方向不同5. 质量为l ・Okg 的物体以某初速度在水平而上滑行，由于摩擦阻力的作用，苴动能随位移变化的情况如图所示，则下列判断正确的是@取10m/s2）（）A. 物体与水平而间的动摩擦因数为0.30B. 物体与水平而间的动摩擦因数为0.25C. 物体滑行的总时间为2・0sD. 物体滑行的总时间为4・0s6. 如图所示，A 球用线悬挂且通过弹簧与B 球相连，两球质量相等.当两球都静 止时，将悬线饶断，下列说法正确的是（）A. 线断瞬间，A 球的加速度大于B 球的加速度B. 线断后最初一段时间里，重力势能转化为动能和弹性势能C. 在下落过程中，两小球、弹簧和地球组成的系统机械能守恒D. 线断后最初一段时间里，动能的增加大于重力势能的减少如图所示光滑管形圆轨道半径为R （管径远小于R ）,小球心方大小相同，质 量均为加，其直径略小于管径，能在管中无摩擦运动.两球先后以相同速 度v 通过轨道最低点，且当小球“在最低点时，小球b 在最高点，以下说 法正确的是（）A. 当小球b 在最髙点对轨道无压力时，小球“比小球b 所需向心力大5 mgB. 当v = y[5^R 时，小球方在轨道最髙点对轨道无压力C. 速度”至少为庐莎，才能使两球在管内做圆周运动D. 只要v>/5^R,小球"对轨道最低点的压力比小球方对轨道最髙点的压力都大6吨« 7.如图所示，表示横波在某一时刻的图像，其波速是8m/s,则下列 说法中正确的是（） A. 该波的周期为o ・5sB. 该波的振幅是5加C. 从这一时刻开始经过1.75s,质点“经过的路程是70c”D. 从这一刻开始经过1.75s,质点“向右移动的距离为⑷”9. 两个相同的小车放在光滑水平板上，前端各系一条细绳，绳的另一端跨过左滑轮各挂一个小盘,盘中可放誌码（如图甲所示）•小盘和祛码所受的重力，等于使小车做匀加速运动的力.因此增减 小盘中的誌码就可以改变小车的受到的合力.两个小车后端各系一条细线，用一个黑板擦把两 条细线同时按在桌上，使小车静止（如图乙所示）.抬起黑板擦，两个小车同时运动，按下黑板擦 两个小车同时停下来.若小车1和小车2所受拉力分别为耳、F2,车分别为尬1、九2,抬起再按 下黑板擦则得两车的位移分别勺、邑，则在实验误差允许的范围内，有（）图甲：实验装盖（侧视图，只画了一个小车）图乙：用板揀控制小车的动与停A. 当m L = m 2^ = 2F 2时，x ± = 2x 2B. 当TH] = m 2> F L = 2F?时，x 2 = 2x ±C. 当mi = 2m z 、F ± = F 2 时，= 2X 2D. 当mi = 2m 2、Fi = F 2 时，x 2 = 2xi10. 关于匀速圆周运动的向心力，下列说法正确的是（）A. 向心力是使物体做圆周运动的力，是根据力的作用效果命划的B. 向心力可以是多个力的合力，也可以是其中一个力或一个力的分力C. 对稳定的圆周运动，向心力是一个恒力D. 向心力的效果是改变质点的线速度大小三' 实验题（本大题共2小题，共15.0分）11. 某校物理探究实验小组，使用50展:交流电，利用打点计时器打出的一条纸带如图所示，人B 、C 、D 、E 为我们在纸带上所选的计数点，每相邻的两个计数点之间有4个计时点未画岀，贝IJ ：y/cm(1) ___________________________ 相邻计数点间的时间间隔为5:(2)根据纸带上所测得数据，打点计时器打下C点时小车的瞬时速度％ = _______ 7H/S；(汁算结果保留两位有效数字)(3)小车的加速度a = _____ m“2.(讣算结果保留两位有效数字)12.如图所示为改装的探究圆周运动中向心加速度的实验装垃。

海淀区高三年级第一学期期中练习语文2019．11一、本大题共8小题，共24分阅读下面材料，完成1—8题。

材料一“三山五园”是对三山五园是对北京西郊皇家园林的总称，这种说法出现于清朝中晚期。

“三山五园”包括香山静宜园、玉泉山静明园、万寿山清漪园（颐和园）、畅春园和圆明园。

静宜园位于地势较高的香山，园中建筑因山就势，参差错落，散点式镶嵌在山体之中。

“园林之胜，重在山水。

”水池作为点缀，或出现在殿前以丰富较窄的院落空间，或处于园中以增加园林趣味。

静宜园占地149公顷，1677年成为康熙的行宫，后来虽有添建，但一直保持着非常好的自然生态，深邃优雅。

静明园的个性与静宜园不同。

静明园所在的玉泉山，湖山尺度非常有限，占地仅65公顷。

玉泉山虽因泉水丰沛而得名，但水面并不大，山体狭长，呈南北走向。

在这种地形上如何建设园林呢？建筑要和湖山尺度配合好，建筑群采用散点布局，高低相映。

山顶上的香岩寺和玉峰塔规模不大，山脚下的建筑多一层。

这样就凸显出玉峰塔的高耸。

乾隆非常喜欢玉泉山的风光，亲自为静明园内十六景命名，正殿名为“廓然大公”，后殿名为“涵万象”，意蕴深远。

畅春园位于今北京大学西墙外畅春园宿舍一带，原是明代武清侯李伟修建的私家园林“清华园”，也叫“李园”，康熙时更名为畅春园。

畅春园以水景为主，水面宽阔，“江淮以北亦当第一也”，清朝改建时仍“因水成景”。

畅春园的叠山艺术也堪称一绝，原来的土山和新添建的假山，岗峰连接；加之遍植各色鲜花树木，绿树成荫，给人天人合一之感，是兼有政治和游乐功能的离宫型园林。

被称为“万园之园”的圆明园，既有金碧辉煌的宫殿，也有玲珑剔透的亭台楼阁，又吸取了欧洲的建筑形式，是世界园林的集大成者。

圆明园也是中国古典园林中平地造园的典范，园内步移景易，景观层出不穷，特色之多，首屈一指．．．．。

圆明园占地350公顷，在“三山五园”中规模最大。

有仙境、欧式园林等景观，也有理政、居住、宗教等场所，这些层峦叠嶂．．．．的建筑都是雍正至咸丰五朝皇帝改造的结果，也大多体现出其治国理念。

2019-2020学年北京市海淀实验中学高三英语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AJuanito Estrella has been a housekeeping manager on the US-based large passenger ship Carnival Spirit for 18 months and feels he has found the suitable position in his career(职业). He has always wanted to travel. “I guess I am a really restless spirit.I like traveling, so when the chance came, I jumped at it,” he says.The chance came in the form of a newspaper advertisement for work on cruise ships（游船）. At the time Estrella was the housekeeping manager at a Melbourne hotel. He applied and, after two interviews, a medical check and police clearance, the job was his.Estrella is responsible(负责的)for the cleanliness of the ship, making sure that 160 crew work properly. “I enjoy it because there is no other work-you wake up each day in a different place anda different culture. It’s exciting when you go to the next country and you don’t understand the language,” he says.Estrella likes being busy and getting to know people from all over the world. The 1,000 crew come from 94 countries, and Estrella has learnt Spanish and a little Croatian.But there is adownside. “You cannot get really drunk...because you have safety responsibilities to yourself and others,” he says. “You don’t really think about home.You start to think about home only when you get closer to your vacation and wonder what you’ll be doing.”Life on the ship is anything but cruising. Estrella and his fellows work at least 10 hours a day, seven days a week. He warns the job is not for everybody. “You have to love being busy and be prepared to work every day-and to give up drinking too much alcohol.” In his spare time, if the ship sails into a port, Estrella explores it, otherwise he works out in the crew’s gym, goes on the internet or calls home.1.Which of the following is true?A.He has been a housekeeping manager for 18 months.B.He doesn’t drink wine now.C.He cannot speak a foreign language.D.He used to be a housekeeping manager.2.The underlined word“downside”in paragraph 5 probably means ________ .A.disappointmentB.disadvantageC.failureD.loss3.In the last paragraph, the writer thinks that life on the ship is ________.A.not a tiring journey at allB.just an interesting voyageC.far from a voyage for pleasureD.more than a pleasant travel by seaBAfter finishing his dinner, Lin Xu opened a WeChat mini-program called "Clear Plate" on his phone and took picture of the empty plates. He was then awarded 157 credit points after the image was uploaded and recognized by artificial intelligence.“Users of the app can use their credit to buy gifts, such as books and cellphones to purchase charity meals donated to children in poor rural areas,” Lin said.A nationwide "Clear Your Plate" campaign is gaining steam online. Efforts to stop food waste and promote thrift are also being made by restaurants that have been urged to create an environment in which consumers are reminded not to waste food. They are also encouraged to offer different portion sizes so that customers can have more choices.The “Clear Plate” mini-program has become popular among young Chinese and currently has nearly 1 million users.Liu Jichen, founder of the startup that developed the app, said that the idea popped up at a dinner in 2017, when Liu found that a restaurant would give diners who polished off their food a card and offer small gifts after a certain number of cards had been collected.“Such an idea can be realized online,” Liu said. He formed a team to work on the project.Yet it was quite challenge for the AI system to identify whether the uploaded photos showed empty plates.To make the AI system smarter, Liu and his team, assisted by more than 1,000 others, spent half a year collecting over 100, 000 samples in canteens and restaurants across the country and used the data to train neural network. Dozens of enterprises, institutions and restaurants have contacted the startup to cooperate on the project.Through the visualized mini-program, people can clearly see the good results of saving food, which will effectively reduce waste, he noted. "We hope our efforts can start a new trend among the younger generation, encouraging them to carry out the virtue of cherishing food and developing the habit of thrift, " Liu said4. What is the main function of the APP "Clear Plate?A. Awarding credit points.B. Giving charity meals.C. Showing the empty plates.D. Encouraging saving food.5. How is the "Clear Your Plate" campaign carried out?A. Customers wasting food are punished.B. People join in it on mini-program.C. Restaurants limit customers' choices.D. People are encouraged to buy gifts.6. What was the most difficult when the app was created?A. Getting other people to cooperate with the team.B. Collecting samples in canteens and restaurants.C. Ensuring the app to recognize empty plates.D. Finding people to fund the app.7. What is the purpose of the writing?A. To introduce an app.B. To promote saving food.C. To praise a startup founder.D. To raise fund for poor children.CA 25-year-old American with a university degree can expect to livea decade longer than a peer who dropped out of high school. Although researchers have long known that the rich live longer than the poor, this education gap is less well documented. And although the average American’s expected span(预期寿命) has been smooth in recent year—and, shockingly, even fell between 2015 and 2017—that of the one-third with a bachelor’s degree has continued to lengthen.This gap in life expectancy is growing, according to new research published in the report of the National Academy of Sciences. Anne Case and Angus Deation ofPrincetonUniversityfound that the lifespans of those with and without a bachelor’s degree started to become different in the 1990s and 2000s. This gap grew even wider in the 2010s.What is the link between schooling and longevity(长寿)? Some argue that better-educated people develop healthier lifestyles: each additional year of study reduces the chances of being a smoker and of being overweight. The better-educated earn more, which in turn is associated with greaterhealth.Ms Case and Mr Deaton argue that changes in labor markets, including the rise of automation and increased demand for highly-educated workers, coupled with the rising costs of employer-provided health care, have decreased the supply of well-paid jobs for those without a degree. This may be contributing to higher rates of alcohol and drug use, suicide and other “deaths of despair”.The authors argued that the educational gap in mortality(致死率) will widenin the wake ofthe covid-19 pandemic. ForAmerica’s overall life expectancy to start climbing again, improvements will be needed across allsocial groups, not just among the privileged few.8. When did the lifespans of people with and without a degree vary greatly?A. In the 1990s.B. In the 2020sC. In the 2000sD. In the 2010s9. According to the article, changes in labor markets reduce jobs for those without a degree. Which change is NOT included?A. The rising spending of employer-provided health care.B. The gap in life expectancy.C. Raised request for better-educated workers.D. The development of automation.10. What does the underlined phrase “in the wake of” probably mean ?A. afterB. untilC. beforeD. while11. What is the best title for the text?A. Changes in labor market.B. Quit bad habits by Further studyC. Educated Americans live longer.D. Highly-educated people develop healthier lifestyles.DAlex Wong, a junior atMarkKeppelHigh SchoolinAlhambra,California, is working hard on his application to a top college. His resume shows off his nearly straight A’s in difficult classes, experience at a summer program atStanfordUniversity, Eagle Scout project and time on the soccer team as well as the school choir. But his steady progress stopped unexpectedly this year. Aiming to open access to college-level Advanced Placement (大学预科) courses, his schoolbegan using a computer-based lottery to give out spaces. Alex got shut out of all three of the courses he requested.The new system caused anger among families whose children failed to get into AP courses, which many consider important to develop advanced skills, improve grade-point averages and allow students to earn college credit, saving them and their families tuition dollars. Students and parents wrote to administrators to complain, circulated a petition (请愿) and launched a Facebook group for trading classes. “I’M DESPERATE! I’LL GIVE YOU FREE FOOD,” one student, Kirk Hum, posted on the 210-member AP Flea Market Facebook group.AP classes have long been held dear by the most talented and ambitious students.But now they are seen aspositive for all students who are willing to push themselves – and schools are increasingly viewing access to them as a basic educational right. But this change has brought challenges.Miracle Vitangcol, a junior atDowntownMagnetsHigh Schoolwith average grades and test scores, is failing her AP US history class. She said she can’t handle the rapid pace and volume of material she needs to remember. But she said she intends to stick it out because the class is teaching her to manage her time, take good notes and work hard. “I’m struggling to adjust,” she said. “But I keep telling myself: ‘It’s OK. You can do it. Just push yourself’.”Some critics worry that the open-access movement is pushing too many unprepared students into AP classes, as shown by higher exam failure rates over the last decade. They also fear that open enrollment (录取) policies are encouraging teachers to weaken courses and give out high grades to students who don’t deserve them. “While expanding access is generally a good thing, we need to make sure we’re not watering down the experience for the high achievers,” said Michael Petrilli, executive vice president of the Thomas B. Fordham Institute, a Washington-based educational policy organization.12. The purpose of the new AP courses system at Alex Wong’s school is to ______.A. make sure all students get access to the AP courses they desire.B. ensure that students have a fair chance to get access to AP courses.C. improve the academic performance of students in AP courses.D. separate high achievers from average students through the new courses.13. According to the article, the AP Flea Market Facebook group is a place where ______.A. students’ parents send their complaints to school administrators.B. students share tips about saving money for college.C. students offer items to trade for the AP courses they need.D. students can find support and guidance on their AP study.14. Which of the following statements would Michael Petrilli agree with?A. Opening AP courses to all students is a bad idea.B. School administrators should maintain high academic standards for AP courses.C. High schools should stop charging students for taking AP courses.D. Access to AP courses is necessary for students applying for top American colleges.15. The author used Miracle Vitangcol’s example to show that ______.A. students need to remember too much in their AP courses.B.AP courses pose a big challenge to unprepared students.C. the secret to success in AP courses is to keep pushing yourself.D. average students don’t deserve their places in AP courses.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。