2019-2020海淀区高三年级第一学期期中练习答案

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北京市海淀区2019-2020学年高三年级第一学期期中语文练习及参考答案

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-解析版

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。

北京市海淀区2019届高三上期中考试数学试题(文)含答案

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

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。

北京市海淀区2019-2020学年高三上学期期中物理试卷 (含解析)

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。

2019-2020海淀区高三年级第一学期期中练习(评标版)(最新整理)

------------------------7 分 ------------------------9 分
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北京市海淀区2019-2020学年高三上学期期中练习英语试卷(word版,有答案)(已审阅)

company.
A. has offered B. had offered C. has been offered D. had been offered
30.^川you be home before 7:00 pm tomorrow?
--Probably not, IJohnny at the airport then.
A. have picked up B. will be picking up C. would pick up D. am going to pick up
31.the concert hall was cold and the sound system caused a few problems, the
A. startedB. has started C. startsD. had started
22.Paper cuts of animals have been found in tombs date back to the time of the
Northern and Southern Dynasty.
第二节完形填空（共
阅读下面短文，掌握其大意，从每题所给的
选项，并在答题卡上将该项涂黑。
Taking Chances
My mother recently read me a speech she had made at a local high school, hoping to36_ my endless quest for answers to everything.
15.What does the woman suggest?
A.Asking the professor for help.

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海淀区高三年级第一学期期中练习
生物参考答案2019.11
一、选择题（每小题2分，共40分）
1. 答案：【C】
2. 答案：【A】
3. 答案：【D】
4. 答案：【D】
5. 答案：【B】
6. 答案：【D】
7. 答案：【B】
8. 答案：【B】
9. 答案：【C】10. 答案：【B】11. 答案：【B】12. 答案：【C】13. 答案：【D】14. 答案：【B】15. 答案：【B】16. 答案：【B】17. 答案：【A】18. 答案：【C】19. 答案：【B】20. 答案：【D】
二、非选择题（共60分）
21.（8分）
（1）脂质（或“磷脂”）；核糖体；（粗面）内质网；流动性；
（2）疏水性；细胞质基质；
（3）胆固醇与肽段1 中的氨基酸结合，而不与肽段2结合（未答不与肽段2结合不给分）；
（4）空间。

22.（8分）
（１）类囊体；无水乙醇（或“丙酮”）；
（２）叶绿素ａ；光反应；
（３）无明显变化；呼吸速率降低，净光合速率升高
【虽然在荫蔽条件下光照不足，但是骆驼刺叶片的叶绿素含量有增加，产生的[H]和ATP 含量较多，所以真（总）光合速率与自然光下结果没有明显区别；】
（４）叶面积大小，气孔数目（写出其中一点或其他合理答案即可得分）
23. （8分）
（1）原癌基因或抑癌基因；癌细胞能无限增殖，形态结构发生显著变化，细胞膜上糖蛋白等物质减少，易分散转移（写出其中一点即可得分）
（2）（分裂）分化；c；
（3）乳腺癌模型；部分支持，实验组肿瘤质量低于对照组，判断肿瘤细胞可能发生转化，但未检测脂肪细胞质量，因此无法判断癌细胞是否转化为脂肪细胞。

（实验组的癌细胞数量减少可能是转化为脂肪细胞造成的，也可能是癌细胞凋亡造成的或其他原因造成）。

24. （10分）
（1）显；3:1
（2）①2；8；1/5；②同一个位点的突变基因
高三年级（生物答案）第 1 页（共2页）
（3）①F2所有抗病个体均有A品系的S序列条带。

②A、B两品系的抗性基因是同一对染色体上不发生交叉互换的两个突变基因。

25. （10分）
（1）①Y 染色体；②如图1
（2）显；X A Y、X A X a；不相符
（3）A 基因所在X 染色体的片段与SRY 基因所在Y 染色体的片段；X a
（4）不合理，胎儿性别的改变是由于大量雄性激素，导致早期发育的胎儿生殖器官男性化，染色体组成未发生改变。

【人类的性别主要由Y 染色体上的SRY 基因决定，雄性激素不能改变女性胎儿的基因组成，因此不能改变其性别。

】
26．（8分）
（1）终止密码子UGA 还可以编码硒代半胱氨酸；；
（2）—CH2—SeH；
（3）不支持，研究证明，当mRNA链UGA密码子后面出现一段特殊序列时，UGA才成为硒代半胱氨酸的密码子；
（4）共同祖先；
（5）谷胱甘肽过氧化物酶能抗氧化、延缓细胞衰老
【硒元素可以构成含有Sec 的蛋白质，补充硒元素能够保证含硒酶的正常合成并发挥作用，减少由于过氧化物造成的细胞损伤和衰老，达到长寿的结果。

】
27. （8分）
（1）生殖隔离；秋水仙素（或“低温”）；AACC，2n=38
（2）①前；易位；②b 和b’；染色体数目
（3）自然选择
高三年级（生物答案）第 2 页（共2页）。