重庆市铜梁县第一中学2018届高三上学期第二次月考英语试题含答案
铜梁一中2018级高三10月月考
英语试题
本试卷分第Ⅰ卷和第Ⅱ卷两部分，共12页。第Ⅰ卷为选择题, 共100分；第Ⅱ卷为非选择题，共50分。全卷共150分，考试时间为120分钟。
第I卷
第一部分听力（共两节，满分30分）
第一节听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
1. What will the man probably do?
A. Visit Bill.
B. Going swimming.
C. Play tennis.
2. What time is Alex supposed to arrive?
A. At 8:00.
B. At 7:30.
C. At 8:15.
3. Where will the speakers probably spend their vacation?
A. In China.
B. In Italy.
C. In Korea.
4. Which color MP4 player does the man want?
A. Blue.
B. Brown.
C. Green.
5. What’s the man doing?
A. Making an invitation.
B. Making an apology.
C. Offering help.
第二节（共15小题；每小题分，满分分）
听下而5段对活或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白你将有时间阅读各个小题,每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。
听第6段材料，回答第6、7题。
6. What’s the probable relationship between the speakers?
A. Mother and son.
B. Husband and wife.
C. Brother and sister.
7. What will the woman most probably do?
A. Buy some flowers.
B. Clean the house.
C. Make a card.
听第7段材料，回答第8、9题。
8. Why is the man tired?
A. He stayed up late for work.
B. He got up too early.
C. He went to a party.
9. Which means of transport did the man take at first?
A. The subway.
B. The car.
C. The bus.
听第8段材料，回答第10至12题。
10. Why is the man a bit short on cash?
A. He bought a new phone.
B. He didn’t get paid.
C. He paid the rent.
11. When will the woman pay the man back?
A. This Friday.
B. This Sunday.
C. Next Wednesday.
12. How much more does the woman have to get?
A. $200.
B. $300.
C.$ 500.
听第9段材枓，回答第13至16题。
13. When was the first manned balloon launched?
A. In the 15th century.
B. In the 17th century.
C. In the 18th century.
14. Who was the first American to fly solo nonstop across the Atlantic Ocean?
A. Charles Lindbergh.
B. Amelia Earhart.
C. John Glenn.
15. When did the first American woman travel into space?
A. In 1963.
B. In 1973.
C. In 1983.
16. What is the man’s attitude toward people living on another planet one day?
A. Doubtful.
B. Hopeful
C. Uninterested.
听第10段材料，回答第17至20题。
17. Where are under-eleven matches held?
A. In the sports field.
B. In the secret garden.
C. In the village football field.
18. Why was the play equipment removed?
A. It blocked the entrance to the garden.
B. It didn’t meet some regulations.
C. It was replaced with a car park.
19. What can be found in the secret garden?
A. Fish.
B. Cats.
C. Dogs.
20. What is in the middle of the garden?
A. The tree house
B. The recycling centre.
C. The story teller’s chair.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，从每题所给的网个选项（A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
A
An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what happens if you add salt？The results are very interesting and can teach you some fun facts about density（密度）．
What you'll need：
*One egg*Water*Salt*A tall drinking glass
Instructions：
Pour water into the glass until it is about half full．
Mix in lots of salt （about 6 tablespoons）．
Carefully pour in plain water until the glass is nearly full （be careful not to mix the salt water with the plain water）．
Gently lower the egg into the water and watch what happens．
What's happening？
Salt water is denser than ordinary tap water．The denser the liquid is，the easier it is for an object to float in it．When you lower the egg into the liquid it drops through the normal tap water until it reaches the salt water，at this point the water is dense enough for the egg to float．If you were careful when you added the tap water to the salt water，they will not have mixed，enabling the egg to amazingly float in the middle of the glass．21．Which of the following is the CORRECT order？
①Mix in lots of salt．
②Gently lower the egg into the water．
③Carefully pour in plain water until the glass is nearly full．
④Pour water into the glass until it is about half full．
A．④②①③B．④①③②C．①④③②D．③④①②
22．What will happen if you drop an egg into a glass of water with about 6 tablespoons of salt？
A．It will float in the water．C．Nothing will happen．
B．It will sink to the bottom．D．The result is not known．
23．Why can the egg float in the water according to the passage？
A．Because ordinary tap water is denser than salt water．
B．Because ordinary tap water is as dense as salt water．
C．Because the denser the liquid is，the easier it is for an object to float in it．
D．Because the more the liquid there is，the easier it is for an object to float in it．
B
Cleaning your plate may not help feed hungry children today, but the timeworn advice of mothers everywhere may help reduce food waste from the farm to the fork, help the environment and make it easier to feed the word’s growing population.
Hard data still being collected, but experts in Chicago said about 30% to 50% of the food produced in the world goes uneaten. The average American throws away 33 pounds of food each month—about $40 worth, which means each person throws away almost 400 pounds of food. The US Department of Agriculture says that 23% of eggs and an even higher percentage of produce ends up in the trash.
“We forget we have all these fresh fruits and vegetables, and at the end of the week we have to throw them away”, said Esther Gove, a mother of three young children in South Berwick, Maine. “Now, I don’t buy as much fresh produce as I used to.”
But the effect of food waste arrives far beyond the kitchen. Agriculture is the world’s largest user of water, a big consumer of energy and chemicals and major emitter of greenhouse gases during production. Experts say reducing waste is a simple way to cut stress on the environment and can ease pressure on farmers, who will be called on to feed an expected 9 billion people around the world in 2050, compared with nearly 7 billion today.
No matter how sustainable(可持续的) farming is, if the food’s not getting eaten, it’s
not sustainable and it’s not a good use of our resources. In richer nations, fruit and vegetables end up in the trash because they are not pretty enough to meet companies’standards, have gone bad in a home refrigerator or aren’t eaten at a restaurant. In developing countries, much food spoils before it gets to market due to poor roads and lack of refrigeration. High food prices are another reason, since some people can’t afford the food that’s produced.
24. From the first paragraph, we know that cleaning your plate ____________.
A. is your mother’s best advice for you
B. can solve certain problems for the world
C. can help feed hungry children all over the world
D. helps meet the growing population’s needs
25. The underlined word “emitter” in Paragraph 4 means ___________.
A. user
B. finder
C. protector
D. producer
26. What is a sustainable and convenient way for a customer in a restaurant?
A. Ordering enough and packing the leftovers.
B. Ordering more than he or she can eat.
C. Ordering less and feeling hungry after leaving.
D. Ordering more and leaving the untouched alone.
27. Which of the following topics will follow the text?
A. More examples of food waste.
B. Experts’ idea on the environment.
C. Ways to reduce food waste.
D. Advice for food with high prices.
C
The term“helicopter parents”refers to“a style of parents who are over focused on their children”
Helicopter parents are always making a big push to provide children with every opportunity to succeed，from baby steps at age 1，homework at age 8，college application at age 18，employment issues at age 25 to family problems at age 30，40 or even older．They constantly shadow the child，always directing his behavior，allowing him zero alone time.
Helicopter parenting can develop for a number of reasons．Worries about the
economy，the job market，and the world in general can push parents toward taking more control over their child’s life in an attempt to protect them．Adults who felt unloved or ignored as children can overcompensate with their own children．When parents see other overinvolved parents，it can cause a similar response．They feel that if they don’t involve themselves in their children’s lives，they are bad parents．
The main problem with helicopter parenting is that it can backfire．To give an example，the house where Mary lived with roommates was broken into and things were stolen．Mary called the landlord(房东)to install an alarm system，but before she could finish the negotiations(协商)，her mother rushed in and demanded action．“I felt like my mother ruined my communication with our landlord．We could have gotten it done ourselves．She was well intended but only made me feel annoyed and defeated，”says Mary．
Obviously，over parenting is motivated with the idea of doing good things but it does the exact opposite．In the long run parents are actually damaging their child’s basic skills to deal with matters independently．It makes the child feel lacking in confidence，less competent in dealing with the stresses of life on their own．They’re winning the battle，but actually losing the war．
28．What’s the purpose of helicopter parents’ over parenting?
A．To do something good for their children．
B．To make their children not ignored．
C．To help their children find a good job．
D．To get rid of the pressure from other parents．
29．What can we learn from the passage?
A．Children who have helicopter parents live a hard life．
B．Helicopter parenting only happens to very young children．
C．Helicopter parents can protect their children against all problems．
D．Helicopter parents do their children great harm in the long run．
30．What will possibly be discussed in the paragraph that follows?
A．The bad effects of helicopter parenting．
B．How we can avoid being helicopter parents．
C．Different opinions about helicopter parenting．
D．The reasons for the development of helicopter parents．
31．What is the author’s attitude towards“helicopter parenting”?
A．Uninterested．B．Objective．C．Positive．D．Disapproving．
D
Are you a social media addict? Are you always checking your smartphone to see how many 'likes' you've received for your latest post? Maybe you feel comforted by the notification sound that someone has sent you a message?
Don't worry, you're not alone. We check our phones an average of 150 times a day, and around 30% of the total time spent online is dedicated to social media. Some experts now fear this habit could be damaging our mental health.
This is something particularly afflicting（使受苦）young adults, according to a study from the University of Pittsburgh. It found the more they used social media, the more likely they are to be depressed. In tests, those people who checked social media frequently were times more likely to be depressed compared to those who spent most of their time generally surfing the internet, who had just times the risk.”
Some of us certainly feel sad when we're ignored on social media sites, or when we see someone else having a better time than us. But depression is a more serious condition and clinical psychologist, Abigael San, recently told the BBC that, "It’s a real is sue, and it’s been getting significantly worse over the last 5-6 years. You can get so hooked（上瘾的）that it takes you away from your real relationships." However, Abigael does admit that social media is more likely to exacerbate（使恶化）pre-existing（既往病史）issues than directly cause them.
Other research by Glasgow University found that teenagers are affected by the 24-hour demands of their social media accounts. It found that those with higher levels of emotional investment in social media, and who use it at night, were more likely to feel depressed and anxious.
Despite these warning signs, why do some of us continue to keep clicking? Well, I suppose we all want to be liked and we don't want to miss out on a conversation that's taking place online. But we need to know when to switch off our virtual（虚拟的）online
world and connect with the real world instead.
32. Who is more likely to be depressed according to the study?
A. People checking social media frequently.
B. People surfing the Internet regularly.
C. People receiving a few “likes” for their posts.
D. People longing for more messages.
33. Why does the author give a quote from Abigael San in ?
A. To introduce the coming topic.
B. To give a more supporting example.
C. To stress the importance of social media.
D. To explain the cause of a social media addict.
34. Why do people get addicted to social media according to the author?
A. Because they have more time and money.
B. Because the virtual world is much more attractive.
C. Because they want to attract more attention.
D. Because emotional investment in social media benefits them.
35. What’s the passage mainly about?
A. It’s common for teenagers to be a social addict.
B. Using smartphones does harm to people’s health.
C. It’s better to stay away from virtual online world.
D. Social media addiction contributes to depression.
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。选项中有构项为多余选项。
There are many ways to fame. Whatever your own recipe (秘诀) is, if you want to make it really big, don’t follow in anyone else’s footprints. 36 .
1. Do something unusual
Celebrity(成名, 名人) is all about standing out from the crowd. 37 Charles Blondin started it all off 150 years ago. He walked a tightrope(钢丝) across the Niagara Falls to the American side, in front of over 10,000 breathless viewers. After his
success, Blondin crossed the Falls many more times in a variety of ways: in chains, on a bicycle, and once, blindfolded.
2. Discover something
The bad news is that there are no countries left to discover. The good news is that in the rainforest of Brazil, there are about three million unnamed types of beetle. One of them could be yours. 38 Though no one will enjoy hearing your name, you will be famous at least until someone comes along and discovers a cure.
3. Appear on reality TV
39 The growth of “reality TV” shows like Big Brother which star ordinary people, means that anyone can possibly become a star. 40 While the show is being broadcast, you’re the biggest star on earth, but once it is over, your glamour disappears, and the life of being a nobody is waiting round the corner.
A. They bring you fame at the speed of light, but it fades just as fast.
B. What will make someone remember you?
C. Or discover a deadly disease and give it your name.
D. What really counts is to explore a unique path.
E. There have never been more chances for “regular” people to become famous.
F. Do something out of the ordinary and you’ll get your piece of fame.
G. Try attending an event that addresses something you don’t know much about.
第三部分英语知识运用
第一节完形填空(共20小题；每小题分,满分30分）
阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑.
A lovely little girl was holding two apples with both hands. Her mum came in and
41 asked her little daughter with a smile, “My sweetie, could you give your mum one of your two apples?”The girl looked 42 at her mum for some seconds, then she suddenly took a quick 43 on one apple, and then quickly on the other. The mum felt the smile on her face 44 . She tried hard not to show her 45 . Then the little girl handed one of her 46 apples to her mum, and said, “Mummy, here you are. This is the 47one.”
No matter who you are, how experienced you are, and how knowledgeable you think you are, always 48 judgment. Give others the privilege to 49themselves. What you see may not be the 50 . Never conclude for others, which is why we should never only 51 the surface and judge others without understanding them 52 .
Those who like to pay the bill, do so not because they are loaded, but because they value 53 above money. Those who 54 first after a fight, do so not because they are wrong but because they value the people around them. Those who often text you, do so not because they have 55 better to do but because you are in their heart.
One day, all of us will get 56 from each other; we will miss our conversations of everything and nothing, the 57 that we had. Days will pass by, months, years, 58 this contact becomes rare... One day our children will see our 59 and ask “Who are these people?” And we will smile with invisible tears because a heart is touched with a strong word and you will say, “ 60 W AS THEM THAT I HAD THE BEST DAYS OF MY LIFE WITH!”
41. A. softly B. quickly C. curiously D. sadly
42. A. down B. up C. out D. around
43. A. look B. bite C. taste D. try
44. A. remain B. rise C. freeze D. speed
45. A. satisfaction B. confusion C. amusement D. disappointment
46. A. rotten B. bitten C. split D. deserted
47. A. juicer B. bigger C. fresher D. sweeter
48. A. offer B. stop C. delay D. pass
49. A. criticize B. introduce C. reflect D. explain
50. A. reality B. purpose C. attempt D. result
51. A. focus on B. hold up C. work out D. give up
52. A. wrong B. last C. first D. little
53. A. material B. friendship C. bill D. surface
54. A. apologize B. suffer C. survive D. sacrifice
55. A. something B. anything C. everything D. nothing
56. A. lost B. retired C. separated D. divorced
57. A. dreams B. argument C. talks D. contradiction
58. A. when B. until C. though D. after
59. A. articles B. stories C. pictures D. telephones
60. A. WHAT B. SUCH C. THAT D. IT
第Ⅱ 卷
第二节（共10小题，每小题分，满分15分）
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
An old proverb says, “Friends are like wine; the older, the better.”So, nowadays many people consider older friends to be 61 (important) than new friends. For example, if two pieces of advice 62 (give) to solve a problem, one from a new friend and the other from 63 old friend, people always tend to adapt the latter one, although the new friend’s advice may be better.
64 (disagree) with the old proverb, I believe that new friends are not 65 (necessary) worse than old friends. Why? Because the 66 (long) of time can not determine whether your friendship is better or not.
Once you call someone friend, he must be a reliable person, 67 interests are in common with 68 (you). As time goes by, a friend’s outside look may change, but the inside characters 69 him and his interests will not change. It is just these unchangeable characters and interests 70 make him a friend to you. Thus, on this point, there is no difference between old and new friends.
第四部分写作(共两节，满分35分)
第一节短文改错（共10小题；每小题1分，满分10分）
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句最多有两处，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（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，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。
Every high school student wants to get into famous universities and they spend most of their time review lessons. Nowadays, many graduates find hard to be admitted to famous universities. To be honest, only the small number of students can get so golden chances. Therefore, I have a strong desire to enter for Beijing University to study. To make my dream come true, I have to know my strength and weaknesses. Besides, I must work hard or put all my time and energy into study. Most important, I must arrange my time properly. I was approaching my dream university with every effort.
第二节书面表达（满分25分）
假定你是李华，你的美国朋友Tom最近在某电视台(TV station)举办的汉语演讲比赛中获得第一名，他的努力和决心给了你重要的人生启迪。请写信向他表示祝贺与感谢。
注意：1.词数100 左右；
2.可以适当增加细节，以使行文连贯；
3.格式已给出，不计入总词数。
Dear Tom,
________________________________________________________________________ ________________________________________________________________________
Yours,
Li Hua
铜梁一中高2018级高三10月月考英语答案
听力：1-5 : BABCA 6-10: CBBAA
11-15: CBCAC 16-20: BCBAC
阅读理解：
21---23 BAC 24---27 BDAC 28---31ADBD 32---35 ABCD 七选五：36-40 :DFCEA
完型填空：41-45: ABBCD 46-50: BDCDA
51-55: ACBAB 56-60: CABCD
短文填空：61. more important 62. are given 63. an
64.Disagreeing 65. necessarily 66. length
67. whose 68. yours 69. of 70. that
短文改错：
71.review → reviewing 72. find后加it 73. the → a 74.so → such 75. Therefore → However 76. 去掉for
77. strength → strengths 78. or → and
79. important → importantly 80. was → am
作文范文：
Dear Tom,
Congratulations to you on your winning first place
in the Chinese Speech Competition held recently. It is no wonder that you have made such great progress in your Chinese study, because you have been working hard and are never willing to give up.
To be honest, what I admire most is your hard work
and determination. It’s from you that I have learned a
valuable lesson, that is, “No pains, no gains.”Therefore,
I would like to express my sincere thanks to you for what
You have taught me.
Wish you more advance in your study! Yours,
Li Hua
2021届重庆市第一中学高三上学期第一次月考数学试题(解析版)
2021届重庆市第一中学高三上学期第一次月考数学试题 一、单选题 1．设集合(){} ln 1A y y x ==-，{ B y y ==，则A B =（ ） A ．[)0,2 B ．()0,2 C ．[]0,2 D ．[)0,1 【答案】A 【解析】先分别利用对数型函数以及指数型函数求值域的方法求出集合,A B ，注意集合中的代表元素，再利用集合的交集运算求解即可. 【详解】 ∵(){} ln 1A y y x R ==-=， { [)0,2B y y ===， ∴[)0,2A B =. 故选：A. 【点睛】 本题主要考查了集合间的运算以及对数函数和指数函数.属于较易题. 2．设a ，()0,b ∈+∞，A =，B =，则A ，B 的大小关系是（ ） A ．A B < B ．A B > C ．A B ≤ D ．A B ≥ 【答案】B 【解析】根据题意计算做差可得22A B >，得到答案. 【详解】 由a ，()0,b ∈+∞，得0A = >，0B => 2 2220A B -= -=>， ∴22A B >，故A B >， 故选：B. 【点睛】 本题考查了做差法比较大小，意在考查学生的计算能力和推断能力. 3．已知直线l 是曲线2y x =的切线，则l 的方程不可能是（ ） A ．5210x y -+= B ．4210x y -+= C ．13690 x y -+=
D ．9440x y -+= 【答案】B 【解析】利用导数求出曲线2y x =的切线的斜率的取值范围，然后利用导数的几 何意义判断各选项中的直线是否为曲线2y x =的切线，由此可得出结论. 【详解】 对于函数2y x = ，定义域为[)0,+∞，则22 y '= +>， 所以，曲线2y x = 的切线l 的斜率的取值范围是()2,+∞. 对于A 选项，直线5210x y -+=的斜率为5 2 ，令522y '=+=，解得1x =，此 时3y =， 点()1,3在直线5210x y -+=上，则直线5210x y -+=与曲线2y x =相切； 对于B 选项，直线4210x y -+=的斜率为2，该直线不是曲线2y x =的切线； 对于C 选项，直线13690x y -+=的斜率为 13 26 >， 令13 2 6 y '= += ，解得9x =，此时21y =， 点()9,21在直线13690x y -+=上，所以，直线13690x y -+=与曲线2y x =相切； 对于D 选项，直线9440x y -+=的斜率为 9 24 >， 令9 2 4 y '= = ，解得4x =，此时10y =， 点()4,10在直线9440x y -+=上，所以，直线9440x y -+=与曲线2y x =相 切. 故选：B. 【点睛】 本题考查利用导数的几何意义验证函数的切线方程，考查计算能力，属于中等题. 4．中国传统扇文化有着极其深厚的底蕴．一般情况下，折扇可看作是从一个圆面中剪
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重庆市铜梁县第一中学万有引力与宇宙章末练习卷(Word版 含解析)
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重庆市第一中学2020届高三上学期期末考试英语(含答案)
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哈师大青冈实验中学2019届高三12月份考试 英语试题 第一部分：阅读理解 第一节：每小题2分，满分30分 A Sydney Cultural Festival – What's on today! European Art Show Location: Art Gallery of New South Wales. Today is the final day of the exhibition featuring 18th and 19th century paintings by some of the greatest European artists, such as Van Gough and Monet. Posters of these great works are available for purchase at the Visitors' Centre. Time: 8:30 am –7 pm Cost: $12 adults; $7 children and students Nature Walks Location: Sydney's Royal Botanic Garden. Come and celebrate our natural environment in one of the world's only nature parks inside a major city. Join our hourly guided tours, starting at the Eastern Gate, and enjoy breathtaking forests, stunning city escapes and the magnificent Sydney Harbour. Time: 9 am – 4 pm Cost: Free Sydney Symphony Orchestra Concert Location: Sydney Opera House. Australia's most famous orchestra is best known for its
重庆市第一中学2021届高三理综上学期期末考试试题
重庆市第一中学2021届高三理综上学期期末考试试题 注意事项： 1．答卷前，考生务必将自己的姓名、准考证号码填写在答题卡上。 2．作答时，务必将答案写在答题卡上。写在本试卷及草稿纸上无效。 3．考试结束后，将答题卡交回。 可能用到的相对原子质量：H-1 C-12 N-14 O-16 S-32 一、选择题：本题共13小题，每小题6分，共78分。在每小题给出的四个选项中，只有一项是符合题目 要求的。 1.下列有关细胞内结构的说法正确的是 A．无丝分裂过程中细胞核与细胞质缢裂是不同步的 B．各种细胞内核糖体的形成都与核仁有关 C．细胞膜上的糖被只与细胞间识别有关 D．生物膜是生物体内所有膜结构的统称 2.下列关于人体细胞生命历程的叙述错误的是 A．胎儿手的发育过程会发生细胞凋亡 B．自由基会攻击蛋白质，使蛋白质活性下降，细胞随之逐渐衰老 C．细胞内单一基因突变会导致细胞恶性增殖且易发生分散和转移 D．细胞分化是基因在不同的时间和空间条件下选择性表达的结果 3. 下列有关生物学实验的叙述，正确的是 A. 低温诱导染色体数目加倍实验中，将大蒜根尖制成装片后再进行低温处理 B. 在“模拟性状分离比”实验中两个桶内的彩球总数一定要相等 C. 杂交实验与测交实验的结果是孟德尔“提出问题”的实验基础 D. 调查红绿色盲发病率，应该在人群中增加被调查人数，以减小误差 4.下列关于神经系统及神经调节的叙述，错误的是 A. 肾上腺素既是激素，又可以在某些突触中传递信息 B. 刺激某一反射弧的感受器或传出神经，可激发相同反射 C. 大脑皮层言语区中，V区受损导致患者不能看懂文字 D.“憋尿”能体现神经系统具有分级调节机制 5.下列关于群落的叙述，正确的是 A．人类活动对群落演替的影响往往是破坏性的 B．土壤中小动物类群丰富研究中，蚯蚓一般采用目测估计法统计 C．福建武夷山常绿阔叶林比西伯利亚泰梅尔半岛冻原物种更丰富 D．重庆中央公园里银杏树高低错落分布，体现了群落的垂直结构 6.某罕见单基因遗传病是由基因突变导致，以全身性发育迟缓、智力障 碍为特征。研究者在调查中发现
重庆市铜梁县第一中学初高中数学衔接教材试题：专题六二次函数的最值问题(附答案)
★ 专题六 二次函数的最值问题 【要点回顾】 1．二次函数2 (0)y ax bx c a =++≠的最值． 二次函数在自变量x 取任意实数时的最值情况(当0a >时，函数在2b x a =-处取得最小值244ac b a -，无最大值；当0a <时，函数在2b x a =-处取得最大值244ac b a -，无最小值． 2．二次函数最大值或最小值的求法． 第一步确定a 的符号，a ＞0有最小值，a ＜0有最大值； 第二步配方求顶点，顶点的纵坐标即为对应的最大值或最小值． 3．求二次函数在某一范围内的最值． 如：2y ax bx c =++在m x n ≤≤（其中m n <）的最值． 第一步：先通过配方，求出函数图象的对称轴：0x x =； 第二步：讨论： [1]若0a >时求最小值或0a <时求最大值，需分三种情况讨论： ①对称轴小于m 即0x m <，即对称轴在m x n ≤≤的左侧； ②对称轴0m x n ≤≤，即对称轴在m x n ≤≤的内部； ③对称轴大于n 即0x n >，即对称轴在m x n ≤≤的右侧。 [2] 若0a >时求最大值或0a <时求最小值，需分两种情况讨论： ①对称轴02 m n x +≤ ，即对称轴在m x n ≤≤的中点的左侧； ②对称轴02m n x +>，即对称轴在m x n ≤≤的中点的右侧； 说明：求二次函数在某一范围内的最值，要注意对称轴与自变量的取值范围相应位置，具体情况，参考例4。 【例题选讲】
例1求下列函数的最大值或最小值． （1）5322--=x x y ； （2）432+--=x x y ． 答案：（1）4 7)2(531 例2当12x ≤≤时，求函数21y x x =--+的最大值和最小值． 答案：5;1min max -=-=y y 例3当0x ≥时，求函数(2)y x x =--的取值范围． 答案1-≥y 例4当1t x t ≤≤+时，求函数21522 y x x =--的最小值(其中t 为常数)． 分析：由于x 所给的范围随着t 的变化而变化，所以需要比较对称轴与其范围的相对位置． 解：函数21522 y x x = --的对称轴为1x =．画出其草图． (1) 当对称轴在所给范围左侧．即1t >时：当x t =时，2min 1522y t t =--； (2) 当对称轴在所给范围之间．即1101t t t ≤≤+?≤≤时： 当1x =时，2m i n 1511322 y =?--=-； (3) 当对称轴在所给范围右侧．即110t t +
高三上学期12月月考英语试题 (2)
高三上期12月月考英语试题 本试卷分第一卷(选择题)和第二卷(非选择题)两部分。共150分。考试用时l20分钟。 第I卷(三部分共115分) 第一部分：听力(共两节，满分30分) 第一节(共5小题；每小题l.5分，满分7.5分) 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有l0秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1. What are they doing? A. Shopping. B. Telephoning. C. Having a meeting. 2. How much time is given to complete the test? 3. Where is the conversation most probably taking place? A. At a car dealer's. B. At a newspaper office. C. At a publishing house. 4. What problem has the man got? A. He doesn't know how to use the machine. B. He can't find a place to get a drink. C. He has no money to buy a drink. 5. What do we learn from this conversation? A. The man goes to a wrong check-in counter. B. The man has just missed his flight. C. The plane's departure time remains unknown. 第二节(共12小题；每小题l.5分，满分l8分) 听下面4段对话。每段对话后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项。听每段对话前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话读两遍。 请听第6段材料，回答第6至7题。 6. How does the woman learn to speak English so well? A. She has many English friends. B. She was once in the Language College. C. She listens to English programs everyday. 7. How long has the woman learned English? A. Three days. B. Three months. C. Three years. 请听第7段材料，回答第8至10题。 8. When was Flight 962 originally due to arrive? A. 9:35. B. 10:05. C. 10:35. 9. Why was the flight delayed? A. It had to make a stop in Chicago. B. The plane had engine trouble. C. The weather in Chicago was bad. 10. Why was the man's wife in Boston? A. There was something wrong with the plane. B. The dialogue does not tell us. C. She went home for a visit.
2021届重庆市第一中学高三上学期期末考试数学(理)试题
2020届重庆市第一中学高三上学期期末考试数学（理）试题 学校:___________姓名：___________班级：___________考号：___________ 一、单选题 1．设集合A ={x |x 2-5x +6>0}，B ={ x |x -1<0}，则A ∩B = A ．(-∞，1) B ．(-2，1) C ．(-3，-1) D ．(3，+∞) 2．复数21i i -在复平面内对应的点为（ ） A ．()1,1-- B ．()1,1- C ．()1,1- D ．()1,1 3．已知向量()()1,3,2a m b ==-，，且()a b b +⊥，则m =( ) A ．?8 B ．?6 C ．6 D ．8 4．圆224690x y x y +--+=的圆心到直线10ax y ++=的距离为2，则a =（ ） A ．43- B ．34- C D ．2 5．现有5人站成一排照相，其中甲、乙相邻，且丙、丁不相邻，则不同的站法有（ ） A ．12种 B ．24种 C ．36种 D ．48种 6．已知ln3x =，4log 2y =，12z e -=，则（ ） A ．x y z << B ．z x y << C ．z y x << D ．y z x << 7．《张丘建算经》是公元5世纪中国古代内容丰富的数学著作，书中卷上第二十三问：“今有女善织，日益功疾，初日织五尺，今一月织九匹三丈.问半月积几何？”其意思为“有个女子织布，每天比前一天多织相同量的布，第一天织五尺，一个月(按30天计)共织布9匹3丈.问：前半个月(按15天计)共织多少布？”已知1匹＝4丈，1丈＝10尺，可估算出前半个月一共织的布约有（ ） A ．195尺 B ．133尺 C ．130尺 D ．135尺 8．设m ，n 是两条不同的直线，α，β两个不同的平面.若m α⊥，n β⊥，则“m n ⊥” 是“αβ⊥”的（ ） A ．充分不必要条件 B ．必要不充分条件 C ．充要条件 D ．既不充分也不必要条件 9．将函数sin(2)3y x π =+的图像向右平移14 个周期后，所得图像对应的函数为()f x ，
重庆市铜梁县第一中学物理第十一章 电路及其应用精选测试卷
重庆市铜梁县第一中学物理第十一章 电路及其应用精选测试卷 一、第十一章 电路及其应用选择题易错题培优（难） 1．用两个相同的小量程电流表，分别改装成了两个量程不同的大量程电流表1A 、2A ，若把1A 、2A 分别采用并联或串联的方式接入电路，如图所示，则闭合电键后，下列有关电表的示数和电表指针偏转角度的说法正确的是 A ．图甲中的1A 、2A 的示数相同 B ．图甲中的1A 、2A 的指针偏角相同 C ．图乙中的1A 、2A 的示数和偏角都不同 D ．图乙中的1A 、2A 的指针偏角相同 【答案】B 【解析】 【详解】 AB.图甲中的A 1、A 2并联，表头的电压相等，电流相等，指针偏转的角度相同，量程不同的电流表读数不同，故A 错误，B 正确； CD.图乙中的A 1、A 2串联，A 1、A 2的示数相同，由于量程不同，内阻不同，电表两端的电压不同，流过表头的电流不同，指针偏转的角度不同，故CD 错误。 2．如图所示，三个定值电阻R 1、R 2、R 3的电阻值均不相等，在A 、B 之间接一个电源，在C 、D 之间接一个电流表，电流表的示数为I ．现将电源、电流表的位置互调，则电流表的示数（ ） A ．可能增大 B ．可能减小 C ．一定不变 D ．由于R 1、R 2、R 3大小关系不知，故无法判定 【答案】C 【解析】 两种情况下的电路连接如图所示：
设电源电压为U =6V ，R 1=3Ω，R 2=2Ω，R 3=6 Ω，在甲图中 23 23 = 1.5R R R R R ?=Ω+甲并， 112==1U R U R 甲并甲并，1=6V 2V 33 U U =?=甲并，电流表的示数为32V 1 =A 63U I R ==Ω甲并甲，在乙图中 12 12= 1.2R R R R R ?=Ω+乙并，335==1U R U R 乙并乙并，1=6V 1V 66 U U =?=乙并，电流表 的示数为11V 1 =A 33 U I R 乙并乙==Ω，故两次示数相同，则选C ． 【点睛】在A 、B 之间接一个电源，假设A 端为正极，在C 、D 之间接一个电流表时，通过电流表的电流通路是：A----R 1----电流表----R 3----B 电路中的电阻是 R 1+R 3；将电源、电流表的地位互调，假设D 端为正极，通过电流表的电流通路是：D----R 1----电流表----R 3----C 电路中的电阻是R 1+R 3．电路的电源不变，电阻不变，故电流一定不变． 3．如图所示的部分电路中，已知I ＝3 A ，I 1＝2 A ，R 1＝10 Ω，R 2＝5 Ω，R 3＝30 Ω，则通过电流表的电流大小和方向是( ) A ．0.5 A ，向右 B ．0.5 A ，向左 C ．1 A ，向右 D ．1 A ，向左 【答案】A 【解析】 【详解】 对于稳恒电路中的某一节点，流入的电流总和一定等于流出的电流总和．对于节点c ，已知流入的电流I ＝3 A ，流出的电流I 1＝2 A ，则还有1 A 的电流要流出节点c ，由此可知经过R 2的电流I 2＝1 A 向右．根据欧姆定律， U 1＝I 1R 1＝20 V U 2＝I 2R 2＝5 V 电压等于电势之差 U 1＝φc －φa U 2＝φc －φb 两式相减可得 φb －φa ＝15 V 即b 点电势比a 点高15 V ，则通过R 3的电流 33 0.5A b a φφI R -= =
高三12月月考英语试题
高三12月月考英语试题 第一卷 第一部分听力（共两节，满分30分） 做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。 第一节（（共5小题：每小题1．5分，满分7．5分） 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回来有关小题和阅读下一小题。每段对话仅读一遍。 1.What did the man win in his dream? A．A holiday ． B．A new car C．Some money．2.Will the woman come to the party? A．Maybe ．B．No．C．Certainly．3.How long has the woman been an author? A．About 30 years．B．About 40 years ． C ．About 70 years 4.What does the woman want？ A．A radio B．Some pens ．C．Some batteries．5.What is the woman doing? A．Asking for information ． B．Asking for an apology ． C．Asking for help 第二节（共15小题，每小题1．5分，满分22．5分） 听下面几段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听第6段材料,回答6至7小题． 6.Why did the woman go to New York? A．To spend some time with the baby． B．To look after her sister． C．To find a new job． 7.How old was the baby when the woman left New York? A．Two months B．Five months C．Seven months 8.What did the woman like doing most with the baby? A．Holding him B．Playing with him C．Feeding him 请听第七段材料，回答9-11题 9.What are the speakers talking about ? A．A way to improve air quality． B．A problem with traffic rules．
重庆市第一中学2020届高三3月月考英语试题含答案
秘密★启用前【考试时间：3月29日15:00—17:00】 2020年重庆一中高2020级高三下期3月月考 英语试题卷2020.3.29 英语试题卷共9页。满分150分。考试时间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。 第Ⅰ卷 Ⅰ.听力部分（共二节，每小题1分，满分20分） 第一节（共5小题；每小题1.5分，满分7.5分） 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1.What will the man do in the job interview? A.Keep smiling. B.Take notes. C.Speak loudly. 2.What is the probable relationship between the speakers? A.Teacher and student. B.Doctor and patient. C.Husband and wife. 3.What does the woman advise the man to do? A.Never complain about failure. B.Never care about exam results. C.Keep on trying hard. 4.Why is the baby crying? A.He wishes to stay with his parents. B.He desires to drink milk. C.He wants to sleep. 5.How much should a couple with two children pay for the tickets? A.15dollars. B.30dollars. C.60dollars. 第二节（共15小题；每小题1.5分，满分22.5分） 听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听第6段材料，回答第6、7题。 6.When will the speakers meet? A.At7:00tonight. B.At7:00pm on Friday. C.At7:30pm tomorrow. 7.What are the speakers talking about? A.Eating together. B.Attending a concert. C.Making a cake.
重庆市铜梁县第一中学2020届高三数学上学期期中试题文【含答案】
重庆市铜梁县第一中学2020届高三数学上学期期中试题 文 本试卷分(Ⅰ)( Ⅱ)卷,共150分,考试用时120分钟 第Ⅰ卷（选择题共60分） 一、选择题：本大题共12小题，每小题5分，共60分．在每小题给出的四个选项中，只有一项是符合题目要求的，在答题卷相应题目的答题区域内作答． 1.已知集合}1|{≥=x x A ，{|230}B x x =->，则A B =( ) A ．[0,)+∞ B ．[1,)+∞ C ．3,2??+∞ ??? D ．30, 2?? ???? 2.命题“2 000,10x x x ?∈++