2019届高二上学期期末联考(2018.2.1)
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2018-2019名校联考第一中学高二上学期期末考试物理试题本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分,共100分。
考试时间90分钟。
注意事项:1.答卷前将学校、姓名、准考号填写清楚。
2.选择题的每小题选出答案后,用铅笔把机读卡上对应题目的答案标号涂黑。
其它小题用钢笔或圆珠笔将答案写在答题卡上。
本试卷分第I卷(选择题)和第Ⅱ卷(非选择题)两部分。
第I卷l至3页,第Ⅱ卷4至6页。
共计100分。
考试时间90分钟。
第I卷(选择题共50分)一、选择题(本题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,第1~6题只有一项符合题目要求,第7~10题有多项符合题目要求。
全部选对的得5分;选对但不全的得3分;有选错或不答的得0分。
)1.关于静电场,以下说法正确的是A.电场线是电场中实际存在的线B.在同一电场中电场线越密的地方,同一试探电荷所受的电场力越大C.电场中某点的电场强度的方向与放在该点的试探电荷所受电场力方向相同D.在任何电场中,电场强度越大的地方,电势也越高2.如图所示为电阻R1、R2的I-U图线,现将R1、R2并联后接到电源上,R1消耗的电功率是9W,则R2消耗的电功率是Array A.6 WB.9WC.12 WD.15 W3.如图所示,电源电动势为E ,内阻为r ,R 1、R 2为定值电阻,R 0为滑动变阻器。
闭合开关后,把滑动变阻器的滑片向左滑动,以下说法正确的是 A .电流表示数变小,电压表示数变大 B .电流表示数变小,电压表示数变小 C .R 1消耗的电功率变小 D .R 2消耗的电功率变大4.如图所示,电源电动势E =8V ,内阻r =1Ω,把“3V,1.5W”的灯泡L 与电动机M 串联在电源上,闭合开关后,灯泡刚好正常发光,电动机也刚好正常工作,电动机线圈的电阻R 0=1Ω。
以下说法正确的是 A .通过电动机的电流为1A B .电源的输出功率是4W C .电动机消耗的电功率为0.25W D .电动机的输出功率为2W5.如图所示,用绝缘细线将带电小球悬挂在天花板上,小球摆动过程中始终处于匀强磁场内,小球连续两次经过最低点时,下列各量发生变化的是(不计空气阻力)A .小球受到的洛仑兹力大小B .小球的加速度C .摆线的拉力大小D .小球的动能6.用粗细均匀的电阻丝折成等边三角形框架abc ,边长为L ,每边电阻均为R ,一电动势为E ,内阻为R 的电源与框架的两个顶点a 、b 相连。
保密★启用前2018-2019学年上期期末联考高二英语试题注意:本试卷分第I卷(选择题)和第II卷(非选择题)两部分。
考生作答时,将答案答在答题卡上,在本试卷上答题无效。
考试时间为100分钟。
第I卷第一部分听力(共两节,满分30分)略第二部分阅读理解(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,从每题所给的四个选项(A 、B 、C 和 D )中,选出最佳选项。
ASupport WorkerDo you have the ability to care for others? Can y ou understand how older p eople feel? Are you a good communicator? Do you have good listening skills? Can you work on weekends?If you have answered YES to the above, we would like to hear from you:Contact us at careers@Trainee HairdresserFull time--- 40 hours per week; permanent.You will work 40 hours a week Monday to Saturday. Your responsibilities will include: welcoming clients, washing hair, bringing coffee and tea to customers, and keeping the salon clean and tidy at all times.No previous experience is necessary.Contact us at cathv@Writers wantedWowee Magazine is looking for writers working 5 days a week for its website. Pay is basedon the number of people who read your articles. You may also receive free tickets to events and free products to test. This is a great opportunity to get valuable work experience.We want people who are: interesting, passionate, skilled.Contact us at info@ModelThink you could be a model? If so, we’d like to meet you! Working as a successful fashion model isn’t easy but it is very exciting and could be a great opportunity.Girls should be over 16 with a minimum height of 172cm and boys should have a minimum height of 182cm. If you are under 16 and do not yet have the required height, we would still be interested in meeting you, but you must bring a parent.Contact us at info@Work for Coffee BeansJoin Britain’s number one c afe at Coffee Beans, where every cafe has the same aims: to create family-like teams and to give excellent customer service.Many different kinds of people come and work with us, so start your career at Coffee Beans: --choose the hours you work-- get management experience--share your love of coffeeContact us at jobs@21. If you are good at communicating, you can apply to be a__________.A. modelB. support workerC. trainee hairdresserD. writer22. If you want to be able to decide your working hours, you should contact_____________.A. careers@B. cathv@C. jobs@D. info@23. In which section of a newspaper can you find this article?A. Advertisement.B. Society.C. Campus.D. Travel.BIf you wish to become a better reader, here are four important points to remember about rate, or speed, of reading:1. Knowing why you are reading—what you are reading to find out—will often help you to know whether to read rapidly or slowly.2. Some things should be read slowly throughout. Examples are directions for making or doing something, arithmetic(算术)problems, science and history books, which are full of important information. You must read such things slowly to remember each important step and understand each important idea.3. Some things should be read rapidly throughout. Examples are simple stories meant for enjoyment, news, and letters from friends, items, or bits of news from local, or hometown, paper, telling what is happening to friends and neighbors.4. In some of your readings, you must change your speed from fast to slow to fast, as you go along. You need to read certain pages rapidly and then slow down and do more careful readings when you come to important ideas which must be remembered.24. According to the passage, your reading speed depends on ________.A. whether the reading material is easy or difficultB. what you are readingC. what your purpose in reading something isD. both B and C25. If one wants to be relaxed by reading, one should take up ________.A. a book on science and technologyB. a story bookC. news, letters from friendsD. some material full of information26. Which of the following readings should you read slowly and carefully?A. Fairy tales.B. Aesop’s Fables.(寓言)C. Directions for use of a machineD. An evening paper.27. Which of the following can best express the main idea of the passage?A. How to raise your reading speed.B. How to decide your reading speed.C. How to improve your reading skills.D. How to choose your reading materials.CLittle Tommy was doing very badly in math. His parents had tried everything—tutors , cards, special learning centers—in short, everything they could think of. Finally they took Tommy to a catholic (天主教的) school.After the first day, little Tommy came home with a very serio us look on his face. He didn’t kiss his mother hello. Instead, he went straight to his room and started studying. Books and papers were spread out all over the room and little Tommy was hard at work. His mother was surprised. She called him down to dinner and as soon as he finished eating, he went back to his room, without a word. In no time he was back “hitting the books”as hard as before. This went on for some time, day after day while the mother tried to understand what was happening.Finally, little Tommy brought home his report card(成绩单). He quietly put it on the table and went up to his room and hit the books. His mom looked at it and to her surprise, little Tommy got an A in math. She could no longer hold her curiosity. She went to his room and asked, “Son, what was it? Was it the nuns (修女)?”Little Tommy looked at her and shook his head, “No. ”“Well then,” she asked again. “WHAT was it?”Little Tommy looked at her and said, “Well, on the first day of school, when I saw that man nailed (钉) to the plus sign (加号), I knew they weren’t joking. ”28. What does the meaning of “Hitting the books” means “_______”.A. work hardB. cheer upC.beat the booksD. throw them29.Why did Tommy's parents send him to a catholic school?A. Because he could eat well there.B. Because his parents wanted him to do better in his math.C. Because he could learn more about nuns.D. Because his parents didn't want him to learn math any more.30.Tommy’s mother felt surprised that his son _______.A was still the same as usual B. ate so much at dinnerC. kissed her hello after schoolD. worked hard but said little31.The last sentence in the passage shows that _______.A. Tommy felt sorry for the manB. Tommy didn't like the plus signC. Tommy was afraid of being nailedD. Tommy liked playing jokes on othersDThe world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest problems is pollution. To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in one place, man moved to another place.But this is no longer true. Man is now slowly polluting the whole world.Air pollution is still the most serious. It’s bad fo r all living things in the world, but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.Many countries are making rules to fight pollution. They stop people from burning coal in houses and factories in the city, and from putting dirty smoke into the air. Pollution by SO2 is now the most dangerous kind of air pollution. It is caused by heavy traffic. We are sure that if there are fewer people driving, there will be less air pollution.The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must take care of the rise in pollution at the same time.32._______, our world is becoming much smaller.A. Thanks to science developmentB. Because of the rise in pollutionC. Because the earth is being polluted day and nightD. Because the earth is blown away by the wind every year33.Hundreds of years ago, life was __________ it is today.A. much easier thanB. as easy asC. much harder thanD. as hard as34.Pollution comes in many ways. We can even hear it. Here “it” means _______.A. rubbish(垃圾)B. noise pollutionC. air pollutionD. water pollution 35.Air pollution is the most serious kind of pollution because _______.A. it makes much noiseB. it makes us angry more easilyC. it makes our rivers and lakes dirtyD. it’s bad for all living things in the world第二节(共5小题;每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。
可能用到的相对原子质量H O 16 Ag 1081. 下列属于化石燃料的是( A. 氢气 B.木柴C.煤D.酒2. 下列属于放热反应的是 A. 生石灰和水 B.碳酸钙高温分解C.灼热的碳和二氧化碳D. Ba(OH)2・8H2O 晶体和 NH4C13. 原电池是将( )的装置A.化学能转化为电能B.电能转化为化学能C.热能转化为化学能D.化学能转化为热能4.右图为水果电池的示意图,下列说法正确的是(A.锌片作负极,质量逐渐减少B.电子由铜片沿导线流向锌片C.铜电极逐渐溶解D •该装置能将电能转化为钠铁铜银2018-2019高二化学上学期期末联考试卷含标准答案高二级一、选择题(54分)(每小题只有一个正确答案)化学能5 •工业上常用电解法冶炼的金属是6. —定条件下,在密闭容器中进行反应:N2(g)+3H2(g) 2NH3 (g),当N2、H2、NH3的浓度不再改变时,下列说法正确的是()A.N2、H2完全转化为NH3 B・N2、H2、NH3的浓度一定相等C.正、逆反应速率相等且等于零D.反应己达到化学平衡状态7.下列物质溶于水后溶液显酸性的是()A. Na2O2B. CaC12C. FeC13D. CH3COONa8.下列属于非电解质的是()A・氢气B.蔗糖溶液 C.已烷D.硫化钠9.下列说法正确的是()A.需要加热才能发生的反应一定是吸热反应B.放热反应在常温下一定很容易发生C.放热反应还是吸热反应主要由反应物、生成物所具有的总能量的相对大小决定D.吸热反应发生过程中要不断从外界获得能量,放热反应不需要外界能量10.应对能源危机的有效途径之一是寻找新能源.下列属于新能源的A.煤B.石油C.太阳能D.天然气11・下列事实不能用勒夏特利原理来解释的是()A.增大压强,有利于S02和02反应生成S03B.热的纯碱溶液去油污能力较强C.加催化剂使N2和H2在一定条件下转化为NH3D.常温下pH-3的H2SO4溶液中水的电离程度小于pH-3的NH4C1 溶液中水的电离程度12.电化学装置工作吋,下列电极上发生的反应一定是氧化反应的是()A.阴极B.负极C.铜电极D.石墨电极13・pH=a的某电解质溶液中,插入两支惰性电极,通直流电一段时间后,溶液的pH>a,则该电解质可能是()A. Na2SO4B. H2SO4C. AgNO3 D・ NaCl14.设C+C02 2C0, Hl>0 反应速率为u 1; N2+3H2 2NH3, H2<0反应速率为u 2。
第一学期期末联考高二(理科)物理试卷【完卷时间:90分钟;满分100分】一、选择题(本题共12小题,共48分。
1~8题每小题4分,在给出的四个选项中,只有一个选项正确。
9~12....题每小题....4.分,正确选项可能不只一个............,全部选对得4分,选不全得2分,错选不得分)1.下列关于物理学史错误的是()A.1785年法国物理学家库仑利用扭秤实验发现了电荷之间的相互作用规律—库仑定律。
B.法拉第曾经做了一个法拉第笼实验。
该实验说明静电屏蔽可以使金属壳内部不受外部电场的影响C.1820年,丹麦物理学家安培电流可以使周围的磁针偏转的效应,称为电流的磁效应。
D.荷兰物理学家洛仑兹提出运动电荷产生了磁场和磁场对运动电荷有作用力(洛仑兹力)的观点。
2.两个分别带有电荷量-Q和+3Q的相同金属小球(均可视为点电荷),固定在相距为r的两处,它们间库仑力的大小为F.两小球相互接触后将其固定距离变为r/2,则两球间库仑力的大小为()A.112F B.43F C.34F D.12F3.如图所示,实线为不知方向的三条电场线,从电场中M点以相同速度飞出a、b 两个带电粒子,运动轨迹如图中虚线所示。
则()A.a一定带正电,b一定带负电B.a的速度将减小,b的速度将增加C.a的加速度将减小,b的加速度将增加D.两个粒子的电势能一个增加一个减小4.在研究微型电动机的性能时,应用如图所示的实验电路.当调节滑动变阻器R使电动机停止转动时,电流表和电压表的示数分别为0.50A和2.0V.重新调节R使电动机恢复正常运转,此时电流表和电压表的示数分别为2.0A和24.0V,则这台电动机正常运转时的输出功率为()A .32WB .44WC .47WD .48W5.在如图所示的电路中,电源的负极接地,其电动势为E 、内电阻为r ,R 1、R 2为定值电阻,R 3为滑动变阻器,C 为电容器,A 、V 为理想电流表和电压表.在滑动变阻器滑动头P 自a 端向b 端滑动的过程中,下列说法中正确的是 ( )A .电压表示数变小B .电流表示数变小C .电容器C 所带电荷量增多D .a 点的电势降低6.如图(甲)所示,两平行导轨与水平面成θ角倾斜放置,电源、 电阻、金属细杆及导轨组成闭合回路,细杆与导轨间的摩擦不计。
2018-2019学年高二上学期期末联考语文试题一、阅读下面的文字,完成1—3小题。
(每小题3分,共9分)“恭敬”连用,表示态度温顺和蔼。
古时候,这两个字却又有所侧重,“敬”是内心修养,“恭”则是这种修养的外在反映或者显现。
先说“敬”,在儒学看来,人心(性)至善至妙,但是,作为个体,人在出生之后,就会受到各种后天欲望情绪的干扰,从而使至善至妙之“心”受影响、被遮掩。
如何才能保证不失本性之真呢?也就是说如何才能保住个性且使之与集体意识一致呢?这就必须要持“敬”。
朱熹曾说“主一无适之谓敬”,他所说的“一”,不是特指某一具体事或物,而是具有丰富儒学内涵的哲学概念,是“道”所生之“一”,也就是最为纯真的人之天性。
而“无适”并不是无所适从,而是坚守专注,不起别念。
可以看出,朱熹所理解的“敬”就是将全副心思用到对“道”的体悟和把握上。
宋儒曾拿《礼》中“执虚如执盈,入虚如有人”这两句话解释“敬”:拿一只空杯子,也应该像拿一杯盛满水的杯子,不能掉以轻心,马马虎虎,也不能因为房间里没有人,而生轻慢之心、不好之念。
否则,杯子会因大意而掉落,心性也会因邪念而亏损。
“敬”在日常实用当中,其作用也是如此之大!再说“恭”,所谓“敬”的外在表现。
现代心理学已经揭示出,有什么样的心理状态,就必然会有相应的表情或身体语言表现出来。
“敬”的内养,也无一例外地表现在外表上,那就是:“正其衣冠,尊其瞻视,俨然让人望而畏之。
”一副端庄肃穆的样子。
宋明以来,道家们往往方巾葛袍,严于治家待人,不苟言笑,“坐如尸,立如斎”,透出来一股僵腐之气,所谓“道貌岸然”,指的就是这种形象。
在儒家统一的价值标准下培养出来的道学家,也有着统一的行为规范和言行举止,表面上看,似乎是超凡脱俗的必然产物,事实上,它不仅扼杀了个性,而且,也从根本上与孔子“因材施教”的精神相违悖。
“道貌岸然”,恰好是儒家学走向僵化的标签。
宋儒忽然从先秦经典里找到一个“敬”来解释修身的手段,很可能是受佛教重“定”的影响。
2018——2019学年度第一学期期末联考高二英语试题命题学校:重庆市綦江中学命题人:周其跃审题人:袁鹏飞本试卷分为第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。
满分150分;考试用时120分钟。
★注意事项:1.答题前,务必将自己的姓名、准考证号填写在答题卡规定的位置上。
2.答选择题时,必须使用2B铅笔将答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦擦干净后,再选涂其他答案标号。
3.答非选择题时,必须使用0.5毫米黑色签字笔,将答案书写在答题卡规定的位置上。
4.所有题目必须在答题卡上作答,在试题卷上答题无效。
5.考试结束后,将试题卷和答题卡一并交回。
第Ⅰ卷第一部分:听力(共两小节,满分30分)第二部分:阅读理解(共两小节,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,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该选项涂黑。
AEducational APP StoreBusuuBusuu helps you learn English language on the go and the lesson's quality is guaranteed as it is based on CEFR language framework. Lessons range from beginners to advanced learners. Busuu is actually a great English app if you want to improve your spoken English by talking withnative speakers.DuolingoDuolingo is one of the best English language apps today and highly recommended for English beginners. The system of the app helps you learn English quickly by spending twenty minutes a day. Duolingo structures your lessons that teach you about seven new words based on a topic and skill points being awarded for completing the lessons.MemriseMemrise uses some creative and easy ways to remember English words. The focus of this app is to help the users expand their vocabulary by learning English words in an effective way. Memrise also offers an offline mode to continue learning without Internet connection.Rosetta StoneRosetta Stone is designed differently from average language apps on the marketplace today. It's trying to teach us English the way we'd learn it if we were children starting to learn the language, it has exercises designed to help you learn basic words. A variety of lessons are offered that Rosetta Stone has been using for years.21. Which mentions the time for daily study?A. Busuu.B. Duolingo.C. Memrise.D. Rosetta Stone.22. Why is Memrise different from the others?A. It will give learners quick progress.B. It has many vocabulary lessons.C. It is designed for English beginners.D. It can be applied offline as well.23. The passage is written to .A. inform new research results.B. encourage English beginners.C. advertise its latest products.D. introduce ways of learning.BLast week I was riding my special motorbike and then stopped at a convenience store. As I was getting my wheelchair off the back, a man watched me from his car and I noticed a wheelchair in his back seat. We spoke for a moment and I asked him about the wheelchair. He answered that it was for his daughter. " Well, do you think she would like to go for a ride on my motorbike with me?" I asked. He seemed shocked that a total stranger would ask him this. Hethought about it for a second and said, "OK, as long as I can follow you.”He introduced me to Amy and he sat her on my back seat. Her father followed me for a few miles and she talked non-stop about what she wanted for Christmas.As we came back to the convenience store, she said, "This ride is the best Christmas present I could ever receive. I have been in a wheelchair my whole life and didn´t know I could do this." I told her about some of the other things I do (ski, travel the world by myself, etc. ) As her father was taking her off my bike. she turned to him and said, "Oh Daddy, I'm going to be OK. Mr. Bryant does all kinds of things, and I will too. "Her father turned away as a tear of joy rolled down his cheek. He hugged me and said, "I was sitting here praying for a gift for Amy that would encourage her. She often felt that her life was dull compared to other children. God answered my prayer just now. Now I pray that God will bless you for your gift to Amy today. "I believed what he said. Being kind and thoughtful to others, we can be an answer to prayer.24. When the daughter was invited to ride by the author, her father .A. was touched as the author wanted to give her a helpB. felt curious as the author behaved in a strange wayC was happy as his daughter could be excited by the authorD. felt astonished as he was unfamiliar with the author25. What can we know about the author?A. He lived a colorful life in fact.B. He worked in a convenience store.C. He used to give a hand to people in need.D. He was disabled at an early age.26. According to the passage, the girl .A. was not good at driving a motorbikeB. usually felt down for her sufferingC. didn't believe in God any longerD. used to be a extremely healthy person27. What do you think is the best title of this passage?A. A useful wheelchair.B. A funny ride.C. A warm hugD. A special gift.CAccording to a new US study, couples who expect their children to help care for them in old age should hope they have daughters because they are likely to be twice as attentive overall.The research by Angelina Grigoryeva, a sociologist at Princeton University, found that, while women provide as much care for their elderly parents as they can manage, men do as littleas they can get away with and often leave it to female family members.Using data from the University of Michigan Health and Retirement Study, a study which has been tracking a cross-section of over-50s for the last decade, she calculated that women provide an average of 12.3 hours a month of care for elderly parents while men offer only 5. 6 hours."Whereas the amount of elderly parent care daughters provide is associated with limitations they face, such as employment or childcare sons' caregiving is associated only with the presence or absence of other helpers, such as sisters or a parent's spouse(配偶). "she explained.“Sons reduce thei r relative caregiving efforts when they have a sister while daughters increase theirs when they have a brother.”“This suggests that sons pass on parent caregiving responsibilities to their sisters.”In the UK 2011 census(人口普查)showed that there are now around6.5 million people with caring responsibilities-a figure which has risen by a tenth in a decade.But many are doing so at the risk of their own health. The census showed that those who provide 50 hours or more of care a week while trying to hold down a full- time job are three times more likely to be struggling with ill health than their working counterparts(相对应的人) who are not careers.28. Where can you probably find the text?A. In a popular science journalB. In a heal care guidelineC. In a physics textbookD. In a tour booklet29. According to the study we know that .A. American couples are preferring daughters to sons a lotB. sons are twice likely as daughters to care for parents in old ageC. having a brother makes women less likely to do their fair shareD. men tend to take less care of their parents than women30. Which of the following statements is true?A. The number of people providing care has increased by 6.5 millionB. More people have left behind their work to look after the elderly.C. Many people who both work and care others can be threatened by health problems.D. People shouldn't take much responsibility to care for the old.31. What's the attitude of the author in the article?A. positiveB. subjectiveC. objectiveD. negativeDWhy do people lie? Many psychologists agree that lying can start from childhood. There are various reasons why children make false statements. They usually tell untruthful stories to cover up the mistakes that they have done in the past. Lying is also a way to avoid receiving punishments from parents. If parents fail to reprimand their children for making up false stories, then there is a possibility that they will continue to lie during their teenage years.Teenagers lie because they want to be accepted by their friends. This is the main reason why they create stories that are not true just to become presentable and acceptable to other people. In some instances, teenagers tell untruthful statements to avoid criticisms from their families and friends.As teenagers grow, lying becomes one of their habits. Their knowledge on making up untruthful stories becomes more developed. People lie in workplaces if they fail to meet the deadlines and if they fail to accomplish and do their tasks efficiently. Some of the common liesmade in workplaces are getting sick and having emergencies at home. The danger involved in frequent lying is when it becomes a character. Frequent lying causes the development of the condition known to doctors as pathological(病态的) lying.Pathological lying is a mental health condition, which is associated with individuals who have the urge to tell untruthful statements. Patients suffering from it make up stories about everything and anything. These individuals pretend to meet the standards of other people who they want to please. These patients cheat other people because it gives them an unexplained pleasure. One of the best ways of treating pathological liars is to help them tell true statements and stories at all times. This may be hard for them, but as they are accustomed to it, they will start to realize that they will be more accepted by their families and other people if they stop themselves from making up false stories.32. The underlined word "reprimand” in Paragraph I means“”.A. satisfyB. criticizeC. discourageD. praise33. Teenagers tell lies mainly because they want to ?A. avoid being punished.B. fool other people.C. attract others' attentionD. satisfy others.34 What are patients suffering pathological lying most likely to do?A. They really want to play jokes on othersB. They always like making up pleasing storiesC. They usually want to show off themselves by making some statementsD. They often suffer from some other diseases35. How does the writer explain pathological lying?A. By showing some typical examplesB. By predicting the future consequencesC. By analyzing its causes and developmentD. By listing a group of phenomena第二节(共5小题;每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。
2018-2019学年高二英语上学期期末考试试题2018~2019学年度第一学期高二英语期末联考试卷第一部分听力(共两节,满分30分)第一节(共5小题;每小题 1.5分,满分7.5分)1. Where does the man live?A. In Flat A, 10th Floor.B. In Flat C, 10th Floor.C. In Flat A, 9th Floor.2. What does the man want the woman to do?A. Speak louder.B. Apologizeto her.C. Turn the radio down.3. How is the man probably feeling about the report?A. DisappointedB. Stressed.C. Confused.4. What will the man do?A. Play baseball.B. Meet his friend.C. Go to the doctor’s.5. When does the man suggest the woman go to Italy?A. In April.B. In July.C. In August.第二节(共15小题;每小题 1.5分,满分22.5分)听第6段材料,回答第6、7题。
6. Where does the woman want to go?A. To the square.B. To the hotel.C. To the coffee house.7. How will the woman most probably go?A. By taxi.B. By bus.C. By underground.听第7段材料,回答第8、9题。
8. What are the speakers mainly talking about?A. How to protect the environment.B. How to choose gifts.C. How to save money.9. What does the man advise the woman to do?A. Make a shopping list.B. Use less paper.C. Send Christmas cards.听第8段材料,回答第10至12题。
友善学校第六十六届期末联考高二语文说明:本试卷分为第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分,共12 页。
考试时间120 分钟,分值150 分。
注意事项:1.答题前,考生一定将自己的姓名、考号填写清楚,并将条形码粘贴到指定地区。
2.选择题一定用2B 铅笔填涂;非选择题一定使用0.5 毫米黑色笔迹的署名笔书写,字体工整,笔迹清楚。
3.请依据题号次序在各题目的答题地区内作答,高出答题地区书写的答案无效,在厕纸、试题卷上答题无效。
4.保持卡面洁净,不要折叠,不要弄破、弄皱,禁止使用涂改液、修正带、刮纸刀。
第Ⅰ卷(阅读题共70 分)一、现代文阅读( 36 分)(一)阐述类文本阅读(9 分,每题 3 分)阅读下边文字,达成1~3 题。
文化自信的根脉支撑据2017 年人民论坛课题组展开的“中国文化自信指数检查”, 中国文化自信指数均匀值为82.26, 较 2016 年有所增添,这说明中公民众对自己文化有着愈来愈高的认知、认可度。
文化自信既是深刻的历史命题, 也是重要的时代命题。
文化自信是“更基础”的自信。
中国的文化自信, 究其实质 , 没法与 5000 多年文明传承切割开来。
中华文化是中华民族生生不息、发展壮大的丰厚滋润和深沉底蕴, 显现了中华民族几千年来的知识智慧和理性思辩。
中华文化如同强盛根系般深植于人民、历史和时代的沃土中 , 确立了我们的强盛底气, 成为文化自信的“源动力”。
文化自信是“更宽泛”的自信。
目前, 中华文化的价值意蕴日趋在全世界化的坐标系中得以彰显。
经过博爱、民本、诚信、正义、和合、大同样中国传统思想, 今世中国将和平、发展、合作、双赢、创新、包含等价值理念传达于世界, 以“中国方案”不停向世界贡献着“中国力量” , 使我们在与外来文化的同样对话和建设性互动中成立更强的自信。
文化自信是“更深沉”的自信。
每到重要历史关头, 中国文化都能即刻代之潮头、发时代之先声。
中华文化适应时代发展, 推陈出新、继往开来。
2018-2019高二英语上学期期末联考试题2018—2019 学年度第一学期全县期末联考试题高二级英语一、阅读理解(每道题2分,共40分)第一节(每小题2分共30分)AAre there any freigners in yur ity? Hw d yu address(称呼) the in English when yu want t talk t these freigners? The fllwing ay be se siple rules the beginners shuld fllw.1. hen talking t strangers there is ften n speial fr f address in English. In st ases, if yu want t ath the attentin f a stranger it is neessary t use suh phrases as “Exuse e”.2. In British English “Sir” and “ada” are nsidered t be t fral fr st situatins. They are used stly t usters in shps r restaurants .hile in Aerian English “Sir” and “ada” are nt s fral and are nly used between strangers, espeially with lder peple whse naes yu dn’t knw.3. hen yu talk t se peple yu knw, yu an use theirnaes diretly. If yu are friends, use their first naes; if yur relatinship is re fral, use “r.”, “rs.”, “s.”, et, befre their faily naes.4. There are any ther frs f address whih an be used between friends and strangers. Hwever, any f these are liited in use. Fr exaple, “pal” and “ate” an be used between strangers, but are usually nly used by en talking t ther en.If yu eet freigners, d reeber nt t address the in wrng ways.1.Arding t the passage, “Exuse e” is ainly used t _______.A. address a persn yu dn’t knB. aplgize t thers. ath the attentin f a strangerD. suggest gd anners2.If hn Sith is yur best friend, arding t the passage yu shuld ften all hi______.A. hnB. Sith . r. hn D. r. Sith3.hat is the title f this passage?A. Freigners in yur ityB. Hw t Intrdue thers. Pliteness EduatinD. Hw t Address FreignersBThe United States is full f ars. There are still any failies withut ars, but se failies have tw r re. Hwever, ars are used fr re than pleasure. They are a neessary part f life.ars are used fr business. They are driven t ffies and fatries by wrkers wh have n ther way t get t their bs. hen salesen are sent t different parts f the ity, they have t drive in rder t arry their prduts. Farers have t drive int the ity in rder t get supplies.Seties sall hildren ust be driven t shl. In se ities shl buses are used nly when hildren live re than a ile away fr the shl. hen the hildren are t yung t walk t far, their thers take turns driving the t shl. ne ther drives n ndays taking her wn hildren and the neighbrs as well. Anther ther drives n Tuesdays, anther n ednesday, and s n. This is alled fring a ar pl. en als fr ar pls, with three r fur en taking turns driving t the plae where they all wrk.re ar pls shuld be fred in rder t put fewer ars n the rad and use less gas. T any ars are being driven.Sething will have t be dne abut the use f ars.4.The United States is filled with ars, but .A. nt every faily has a arB. few failies have tw ars r even re. every Aerian has a arD. every faily has a ar5.hih stateent is true arding t the third paragraph?A. Sall hildren are driven t shl.B. All hildren g t shl by bus in se ities.. thers drive their hildren wh ant walk t shl.D. Shl buses pik up all hildren.6.thers fr ar pls in rder that .A. they an drive t shlB. they an take turns driving their hildren t shl. they reah shl quiklyD. they an drive their hildren t shl in tie7.The traffi in and arund ities is a great prble beause .A. t any ars are being drivenB. there are t any ar pls. peple put fewer ars n the rads D. there is less gasNearly everyne is bullied (欺负) at se tie in their lives. If yu are being bullied, yu ay feel sared, but yu we it t yurself t try and srt ut the situatin s that the bullying stps.It is surprising that all srts f peple wh are nw very suessful adults were bullied when they were yung. It is enuraging t knw that it is pssible t sueed, in spite f being bullied at shl. All f these well–knwn peple were bullied at shl: Phil llins, Harrisn Frd, T ruise and any thers.HAT AN I D IF I A BEING BULLIED?If yur shl has an anti–bullying syste, use it t get help. If yu’re nt sure hw it wrks, then talk t a teaher. Se shls ignre bullying, but dn’t bee resigned (听天由命) t being a viti. yu an still help yurself and ask thers t help yu.Tell a friend what is happening. Ask hi r her t help yu. It will be harder fr the bully t pik n yu if yu have a friend with yu fr supprt.Dn’t fight bak if yu an avid it. st bullies are bigger r strnger than yu. If yu fight bak yu uld ake the situatin wrse, get hurt r be blaed fr starting thetruble.Try t avid being alne in the plaes where yu knw the bully is likely t pik n yu. This ight ean hanging yur rute t shl, aviding parts f playgrund, r nly using n rs when ther peple are there.keep a diary f what is happening. rite dwn the details f the inidents and yur feelings. hen yu d deide t tell sene, a written rerd f the bullying akes it easier t prve what has been ging n.8.hat uld be the best title f the passage?A.hat t d if bulliedB.Hw bullying urs.Fight bak when bulliedD.Bullying—whse fault?9.Fr the first tw paragraphs we an infer that_____ .A.bullying seld happens ang pepleB.bullying is very n ang peple.well–knwn peple used t be bullied when yungD.rdinary peple are nt likely t be bullied10. hen wuld a persn be likely t be bullied?A.hen he is with a friend.B.hen he is ging he by hiself..hen in a r full f peple.D.hen he is playing n the playgrund.11. By writing dwn the details f the inidents, yu an______A.hange the bad situatinB.avid being bullied.easily prve what is happeningD.ake the bully saredDyu ay be failiar with the fllwing faus peple, but have yu heard f their graduatin speehes, in whih they either share their unfrgtten experienes r give yu se great inspiratin(启迪).●ihael Dell, University f Texas at AustinAnd nw yuve aplished sething great and iprtant here, and its tie fr yu t ve n t whats next. And yu ust nt let anything prevent yu fr taking thse first steps ... yu ust als it t the adventure. ust have faith in the skills and the knwledge yuve been blessed (赐予)with and g.●.k. Rwling, Harvard UniversityHalf y lifetie ag ,I was striking an uneasy balanebetween y abitin and the expetatin fr y parents wh were nt rih...But what I feared st fr yself at yur age was nt pverty(贫穷), but failure. The fat that yu are graduating fr Harvard suggests that yu knw little abut failure, yu ight be driven by a fear f failure quite as uh as a desire fr suess.●Steve bs, Stanfrd UniversitySeties lifes ging t hit yu in the head with a brik. Dnt lse faith...yur wrk is ging t fill a large part f yur life, and the nly way t be truly satisfied is t d what yu believe is great wrk, and the nly way t d great wrk is t lve what yu d. If yu havent fund it yet, keep lking, and dnt settle.●Bill Gates, Harvard Universitye need as any peple as pssible t have aess t the advaned tehnlgy t lead t a revlutin in what huan beings an d fr ne anther. They are aking it pssible nt ust fr natinal gvernents, but fr universities ,saller rganizatins, and even individuals t see prbles, see apprahes and deal with the wrlds inequities(不公平)like hunger, pverty, and s n.12. hat ihael Dell said is t urge us t .A. listen t ur heartB. pursue ur dreas. fllw thers exaple D. learn fr ur istakes13. hat did .k. Rwling fear st when she was studying in university?A. Pverty.B. Hunger.. Failure. D. Appearane.14. h wants t express "keep lking fr what yu believe in"?A. ihael Dell.B. .k. Rwling.. Bill Gates. D. Steve bs.15. hat des Bill Gates suggest peple d?A. ake ntributins t the envirnent.B. Take respnsibility fr their wn behavir.. ake int effrts t rid se glbal prbles.D. aster as uh advaned tehnlgy as pssible.第二节七选五(每小题2分,共10分)Hw t Lk and Feel BeautifulLife an be uh easier if st peple are nt t hard n theselves abut their wn appearane and persnality.16..1. Spend tie fr yurself.Everyne needs t spil hiself r herself ne in a while. Ging t a spa r trying sething siple an iprve greatlyn hw yu feel.2. Eat healthy and exerise.keeping yur bdy in shape and eating healthy fd an d wnders fr yu nt nly physially, but give yu great energy t be ative and fit.17... 3. Stay less stressed.18.. Try yga, sthing (抚慰人心的) usi t ease and relax yur ind and bdy. D whatever that wrks fr yu t prevent nstant wrries..4. 19..Treat yurself by buying a new utfit, a pair f shes r a beautiful neklae r earrings t give an extra bst in the way yu lk..5. Be ntent with yurself.The best ethd t stay beautiful is being frtable in yur wn skin by having nfidene and thinking highly f yurself (but nt t the extree where yu are arrgant). Aepting that yu are an unique individual with great gifts an definitely hange yur life fr the better..6. Sile, laugh, and stay psitive.20.. And it als gives yu a beautiful glw (容光焕发) that ake thers want t be arund yu.A. G shppingB. ear akeup. Read re n different ways t lk and feel beautifulD. Ignre negative ents and stay away fr negative sulsE. Reebering these three fatrs helps draw the right peple in yur lifeF. Als taking vitains and suppleents is gd fr yur bdy, skin, and hairG. Situatins in ur life at ties an ake us feel physially, entally, and etinally stressed二、完形填空(每空1.5,共30分)“Lend a hand t thers if yu an,” I ften tell yself. ne night I was 21 thrugh a lal neighbrhd when I saw a little by 22 at the radside. He seeed t be 23 ,s I stpped y ar t see if he needed any help. 24 I ae up t hi I fund his eyes were filled with tears. Sething 25 ust have happened t hi. I asked hi why he was here 26 ,but he wuldn’t say anything. hen I 27 hi t have se ie rea sewhere,he agreed t 28 y ar.As we were 29 ,I kept asking where he 30 and ffered t take hi he. Finally he said,“N,please. She has been31 t e.” I asked hi if he lived with his parents,and was tld that he ran away beause he disliked his stepther. He said that he wanted t 32 his ther,but she lived in Texas.e drve arund fr abut an hur,never finding a(n) 33 ie rea stre,and he still 34 t be taken he. Finally he tld e the 35f his best friend,s I tk hi there and gave hi y phne nuber.A week later I gt a(n) 36 fr his friend’s parents,telling e that they had 37 igarette burns n his ars and ther uts arss his bak. He ended up being 38 t his ther in Texas after a big urt (法庭) battle. It gave e uh 39 t have been able t play a part in helping hi esape fr the 40 wrld he had been living in.21.A.walking B.running .driving D.yling22. A.rying B.playing .reading D.daning23. A.in atin B.in danger .in harge D.in truble24. A.If B.hen .Sine D.Althugh25.A.strange B.interesting .unpleasantD.unbelievable[26.A.alne B.again .t D.instead27.A.allwed B.rdered .wished D.invited28.A.hek B.take .repair D.wash29.A.wathing B.preparing .searhing D.wandering30.A.lived B.hid .std D.slept31.A.friendly B.iplite .generus D.unkind32.A.lk after B.stay with .learn fr D.wait fr33.rge B.great .pen D.speial34.A.refused B.hped .agreed D.regretted35.A.nae B.idea .hbby D.address36.A.letter B.all .e­ail D.essage37.A.ade B.fund .leaned D.treated38.A.sent B.shwn .arried D.intrdued39.A.hnr B.wealth .pleasure D.pain40.A.sall B.quiet .perfet D.ld三、语法填空(每空1.5分,总分15分)If yure invited t an Aerian friends he fr dinner, keep 41 ind these general rules fr plite behavir.First f all, arrive apprxiately n tie (but nt early).42 (Aeria) expet prptness (准时).hen yure invited t senes he fr a eal, 43 is plite t bring a sall gift. Flwers r andy are always apprpriate. If yu have a(n) 44 (attrat) ite ade in yur native untry, yur hst r hstess wuld ertainly eny 45 (reeive) that asa gift.earing prper lthes and 46 beautiful sile is siply nt enugh. Table anners are als very iprtant. D nt pen yur uth t talk, unless yu have swallwed yur fd. Als, hew fd with yur uth 47 (lse). hen yu want t get the fd 48 is at a distane, d nt streth yur hands t reah fr it. Instead, ask fr the fd t be passed t yu.Dnt leave 49 (iediate) after dinner, but dnt verstay yur wele, either. hen yur friends see t be getting tired and running ut f nversatin, take their behavir as a ue (暗示) t leave. The next day, all r writea thank­yu nte 50 (say) hw uh yu enyed the evening.四、短改错(每小题1分,共10分)假定英语课上老师要求同桌之间交换修改作,请你修改你同桌写的以下作. 中共有10处语言错误,每句中最多有两处,每处错误仅涉及一个单词的增加,删除或修改.增加: 在缺词处加一个漏字符号( ^ ), 并在下面写出该加的词.删除: 把多余的词用斜线( / ) 划掉.修改:在错的词下面画一横线,并在该词下面写出修改后的词.注意: 1. 每处错误及其修改均仅限一词;2. 只允许修改10处,多者(从第11处起)不计分.This afternn ur lass rganize a sial task in the nearby park. n arriving there, we were divided with three grups. The first grup lleted the rubbish thrwing by visitrs, suh as waste paper, igarette ends, plasti bags and s n. eanwhile, a send grup set up several bulletins(广告牌) t ask visitrs t take are f the flwers and tree in the park. The last grup gave ut leaflets(传单) t visitrs, reinding the f the danger f “white pllutin” but the iprtant f envirnental prtetin.In y eyes, that is very iprtant fr us t prtet ur envirnent. Fr the sake f peple’s healthy and happiness, ative easures shuld be taken t ntrl and t prevent pllutin and everyne shuld ake ntributins t it.五、单词拼写(共15小题;每小题2分,满分30分)51.It seeed that the driver was _______(blae)fr the terrible aident.52.Arding t the law, drivers wh are drunk are _______ (禁止) fr driving.53.herever yu g, yu an find this kind f ____(分布广的) plant.54.T keep things ve sthly, they need a re ______(灵活的) pliy.55.They are thinking f ways t deal with air ___________ (污染).56.This ativity helps ________(加强) ery and build trust.57.yu an’t always ____(预测) a heavy rain r reeber yur ubrella.58.I a very _____(delight)t aept yur lvely present.59.It shws that a knwledge f first aid an ake a _____(different).60.The rganizatin , _____(fund) 25 years ag, ais t help thse in need.61.These rules will have____ (psitively) influene n the develpent f the lal arket.62.The grund is vered by ___(fall) leaves in autun.63.Thse are y ____(persn) letters. yu have n right t read the.64.Hearing the ______(enurage )news,we all felt enuraged.65.There was slight _____(pssible) f anther earthquake.六、书面表达(25分)面对繁重的学业负担,很多学生出现了不同程度的心理和身体方面的不适。
友好学校第六十六届期末联考高二物理说明:本试卷分第I卷(选择题)和第II卷(非选择题)两部分,共6页,共17题。
考试时间为90分钟,共100分。
注意事项:1. 答题前,考生将姓名、准考证号填写清楚,并将条形码粘贴到指定区域。
2.选择题必须用2B铅笔填涂;非选择题用0.5mm黑色中性笔书写,字迹工整,笔迹清楚。
3. 请按照题号顺序在各题目的答题区域内作答,超出答题区域书写的答案无效,在草纸、试题卷上答题无效。
4. 保持卡面清洁,不要折叠,不要弄破、弄皱、不准使用涂改液、修正带、刮纸刀。
第I卷(选择题,共48分)一、选择题(共48分,1~8题为单选题,9~12题为多选题.)单项选择题(每个小题只有一个正确答案,每小题4分,共32分.)1. 下列关于静电场电场线和磁感线的说法中,正确的是()A. 电场线和磁感线都是电场或磁场中实际存在的线B. 磁场中两条磁感线一定不相交,但在复杂电场中的电场线是可以相交的C. 电场线是一条不闭合曲线,而磁感线是一条闭合曲线D. 电场线越密的地方,同一试探电荷所受的电场力越大;磁感线分布较密的地方, 同一电流元所受的磁场力也越大2.下列说法正确的是()A. β射线比α射线更容易使气体电离B.γ射线在电场和磁场中都不会发生偏转C. 太阳辐射的能量主要来源于重核裂变D. 核反应堆产生的能量来自轻核聚变3. 按照玻尔理论,一个氢原子中的电子从一半径为r a的轨道自发地直接跃迁到一半径为r b的轨道上,已知r a>r b,则在此过程中()A.原子要吸收某一频率的光子 B.原子要发出一系列频率的光子C.原子要吸收一系列频率的光子 D.原子要发出某一频率的光子4. 一电流表的满偏电流I g=1mA,内阻为200Ω。
要把它改装成一个量程为0.5A的电流表,则应在电流表上()A.并联一个200Ω的电阻 B.并联一个0.4Ω的电阻C .串联一个0.4Ω的电阻D .串联一个200Ω的电阻5.如图所示的U —I 图像中,直线I 为某电源的路端电压与电流的关系,直线Ⅱ为某一电阻R 的伏安特性曲线,用该电源直接与电阻R 连接成闭合电路,由图像可知 ( )A .电源的输出功率为3.0 wB .电源电动势为3V ,内阻为0.5Ω C. 电源内部消耗功率为1.0 w D. R 的阻值为1.5Ω6. 在下列4个核反应方程中,x 表示质子的是( ) A. 30301514P Si+x →B.x Th U +→2349023892C. 2712713012Al+n Mg+x →D. 2743013215Al+He P+x →7. 一个正电荷从无穷远处(电势为0)移入电场中的M 点,电场力做功7.0×10-9焦耳,若将另一个等量的负电荷从无穷远处移入同一电场中的N 点,必须克服电场力做功8.0×10-9焦耳,则M 、N 两点的电势大小的关系是( ) A .0<φM <φNB .φN <φM <0C .φM <φN <0D .0<φN <φM8. 一带电油滴在匀强电场E 中的运动轨迹如图中虚线所示,电场方向竖直向下, 若不计空气阻力,则此带电油滴从a 运动到b 的过程中,能量变化情况为( ) A .动能减小B .电势能增加C .重力势能和电势能之和增加D .动能和电势能之和减小多项选择题(每小题4分,共16分,全选对的得4分,选不全的得2分,有选错的得0分) 9. 以无穷远处电势为零,下列关于电势与电势能的说法正确的是( ) A. 电荷在电场中电势高的地方电势能大B. 在电场中的某点,电量大的电荷具有的电势能比电量小的电荷具有的电势能大C. 在正点电荷形成的电场中的某点,正电荷具有的电势能比负电荷具有的电势能大D. 在负点电荷形成的电场中的某点,正电荷具有的电势能比负电荷具有的电势能小10.如图,电源电动势为E ,内阻为r ,滑动变阻器电阻为R ,开关闭 合,两平行极板间有匀强磁场。
26.(12分)图甲是世界某区域图,图乙是图甲区域内西雅图、丹佛两地日平均日照时数统计图。
读图,回答下列问题。
(1)比较图甲中A、B两河流水文特征的差异。
(6分)
(2)分析西雅图和丹佛两地日平均日照时数差异及原因。
(6分)
27.(20分)阅读图文材料,完成下列要求。
科罗拉多河发源于落基山脉,上游穿行于山区;中游流经科罗拉多高原,形成著名的科罗拉多大峡谷,从谷底到顶部分布着不同地质年代的岩层,并含有代表性的生物化石;下游地势低洼,年均降水量不足100 mm。
科罗拉多河狂野不羁,每年春末夏初,洪水携裹近亿吨泥沙流入墨西哥境内的加利福尼亚湾,在河口堆积形成巨大三角洲。
20世纪30年代开始,美国在科罗拉多河干支流修建众多水利工程,该河被驯服,但下游径流量锐减,三角洲沦为沙漠。
下图示意科罗拉多河流域。
(1)简析科罗拉多河狂野不羁的原因。
(8分)
(2)推测科罗拉多大峡谷的形成过程。
(4分)
(3)分析科罗拉多河下游水量锐减对三角洲自然环境的负面影响。
(8分)
28.(18分)阅读图文材料,完成下列要求。
材料一马拉开波盆地位于委内瑞拉西北部,四周山地环绕,盆地中心是南美洲最为湿热的马拉开波湖湖区。
湖区大部分高温多雨,年平均降水量1500毫米以上。
材料二马拉开波湖原本仅通过一条狭窄的水道同加勒比海连接,湖水北咸南淡。
为了发展湖内的采油业,50多年前人们开始将连接外海的水道拓宽、挖深。
(1)从地理位置和地形的角度分析马拉开波湖区“热”的原因。
(6分)
(2)从气压带和风带角度分析马拉开波湖区冬夏半年降水都较多的原因。
(6分)
(3)结合材料分析马拉开波湖湖水北咸南淡的原因。
(6分)
26.(1)径流季节变化B河大于A河,B河夏季流量(较)大(出现汛期);含沙量B河大于A河;B河有结冰期,A河没有结冰期。
(2)丹佛各月的日平均日照时数大于西雅图,冬季(冬半年)差值更大。
原因:西雅图为温带海洋性气候,各月阴雨天气多,丹佛受山地阻挡,阴雨天气少,丹佛冬季阴雨天气远少于西雅图;丹佛地势较高,空气较稀薄;冬半年西雅图的昼长小于丹佛。
27.(1)上游降水量较大,地势高,气温低,积雪量大;春末夏初,气温迅速回升,积雪迅速融化,河流流量大增;中上游支流多,流域面积广,汇入干流水量大;河流中上游落差大,河水流速快。
(2)首先是外力搬运的物质在低处沉积,固结成岩;然后由于内力作用,地壳抬升,形成科罗拉多高原;进而导致科罗拉多河及其支流的落差加大,河水流速加快,下切侵蚀能力增强,最终形成科罗拉多大峡谷。
(3)下游径流量减少,地下水位下降,海水倒灌,水质变差;来水来沙减少,三角洲土壤肥力下降;海水入侵,海岸线侵蚀加剧,三角洲面积缩小;湿地减少,影响动植物的生长与栖息,生物多样性减少;蒸发旺盛,气候更加干旱,荒漠化加剧。
28.(1)纬度低,气温高;盆地地形,地形封闭,风力较小,盆地内热量不容易散发(6分)
(2)夏半年,受赤道低气压带上升气流控制,降水充沛;冬半年,受东北信风影响,海洋和湖泊带来丰沛的水汽,受到湖泊四周山地抬升,形成地形雨。
(6分)
(3)(1)南部(降水量大)入湖河流多,有大量淡水注入;(2分)北部与加勒比海有水道连接,湖水受海水混合不断变咸;(2分)人工拓宽入海水道加剧了海水倒灌,增加了北部湖水盐度。
(2分)。