2020届湖北高三八校第一次联考英语试题(部分)

2020届湖北高三八校第一次联考英语试题答案第二节(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。

选项中有两项为多余选项。

Be a good touristTourism can be both good or bad. Yes, it brings in money for the local economy and creates lots of jobs for locals, but it may also bring some problems.36 Tourists have used paint, rocks or even keys to write on the Luxor Temple in Egypt, the Colosseum in Rome, Stonehenge in the UK, memorial stones at the bottom of Qomolangma, and many, many other places. Thousands of tourists sites are being destroyed by tourists who “love them to death”. 37 If you want to leave a mark on the world, do it by changing someone’s life with kindness and love. Pass kindness along to future generations, not destruction.Another big problem in some places has been tourists disturbing the local people and life.38 For example, Chang Mai University in Tailand and Yonsei University in South Korea have great numbers of tourists visiting their campuses and walking through their libraries and other public areas, taking pictures of students and disturbing their studies. I have three words for tourists like this: please be considerate. 39The number of problems from tourists is endless: walking in large groups without considering others who need to walk by, crossing roads with observing local traffic laws, and many more. The only way to solve the issue of the terrible tourist is to make sure that you not only one! 40 Remember, whenever you step outside your country’s borders, you are representing your country to the rest of the world.A.Just think from other aspects.B.When in Rome, do as the Romans do.C.Have fun in a way that does not disturb others.D.Be the best, kindest, most polite tourist possible.E.I have three words for people like this: please stop it.F.One growing problem is tourists who want to prove that they have visited someplace.G.Some tourists wander around and take pictures of local people without asking for their permission.答案:FEGDC第二节完形填空(共20小题,每小题1.5分,共30分)认真阅读下面短文, 从短文后各题所给的A, B, C, D 四个选项中,选出最佳选项,并在答题纸上将该项涂黑。

Last Sunday, there was no dirt in the air, only bright spring sunshine and clear blue sky. After church, Papa headed out to the field to check on the cattle while Mama started dinner. Faye and I played in the yard. The temperature suddenly dropped---it felt good. The 41 had been building since dawn.The Mama shouted from the 42 , “Iris, you and Faye get inside, real quick now!”I looked to the west ans saw a huge black cloud of 43 , like thick smoke from a railway engine’s chimney. All the birds flew away. “Faye, go with Mama!” I 44 . “I’ll warn Papa.”Faye ran toward the house. The storm hit so fast that I 45 saw her climb the porch(门廊) steps. In a short time, the day turned into night. I 46 for Papa, hoping my voice would lead him back.The dirt and sand stung my face like a thousand bees. I needed to get to shelter. 47 my face with one hand, I made my way toward the car and opened the door. Dirt flew in with me as I pulled the door closed. Papa was still out there! I needed to help him 48 the car.I searched the dashboard() and found the switch for the front 49 . They made some rays, but would Papa see them in the thick 50 ? I pushed the horn again and again, hoping Papa would hear it.51 , Papa’s face appeared at the window. My heart jumped with surprise and 52 . He opened the door and climbed onto the seat next to me. He coughed and wiped his eyes with dirty hands, then pulled me into his arms. “Oh, Iris, you’re 53 .”I hugged Papa and 54. I could feel the tears streaming down my dirty cheeks. Papa 55 my face. “Your mother and Faye?” I said, “They are in the house. ” Papa nodded, “Good. We’ll wait out the storm there.” Papa shut off the car’s lights and I worried the dirt would 56 us.Finally, the wind died down and the dust started to 57 . Papa kicked against the door, opening it far enough to let us out. We went home as Mama 58 out. “Mama!” I shouted and ran into her arms. “Oh, my precious Iris,” Mama cried. “ You and Papa are safe!”“I’m safe 59 Iris,” Papa said. “The car’s horn led me to shelter.”“I’m so proud of you,” Mama said to me.I cried even more then, tears of joy because our family had 60 the horrible storm.41.A.sand B. thunder C. heat D. snow42.A.church B. house C. field D. car43.A.fog B. gas C. steam D. dust44.A.said B. complained C. suggested D. shouted45.A.hardly B. constantly C. really D. surprisingly46.A.screamed B. waited C. looked D. searched47.A.Cleaning B. Touching C. Covering D. Rubbing48.A.fix B. find C. recognize D. drive49.A.lights B. handles C. wheels D. windows50.A.smoke B. darkness C. forest D. atmosphere51.A.Curiously B. Disappointedly C. Suddenly D. Unexpectedly52.A.relief B. warmth C. excitement D. bravery53.A.handsome B. cautious C. safe D. impressive54.A.smiled B. whispered C. relaxed D. cried56.A.bury B. leave C. hurt D poison57.A.spread B. multiply C. settle D. double58.A.walked B. slipped C. laughed D. dashed59.A.rather than B. apart from C. thanks to D. other than60.A.survived B. defeated C. experienced D. causedCBDDA ACBAB CACDB ACDCA第二节(共10小题每小题1.5分,满分15分)阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

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统考版2022届高考英语一轮复习课时提能练20必修4Unit5Themeparks含解析新人教版20

统考版2022届高考英语一轮复习课时提能练20必修4Unit5Themeparks含解析新人教版20

课时提能练(二十)必修4 Unit 5 Theme parksA:知识层面Ⅰ.语境语法填空A(考查派生词)Due to local governments' great efforts, 1.tourism (tour) is booming in the 2.central (centre) part of this country. Many scenic spots are receiving more and more visitors by 3.lengthening (long) the opening time and lowering the 4.admission (admit) charges. Many foreigners are ing here for 5.amusement (amuse), so introductions with the English 6.translation (translate) to the scenic spots are seen everywhere. All tourist 7.attractions(attraction), which are closely monitored by the government, provide 8.fantastic (fantasy) services and strict management making sure everyone enjoys himself in a safe and fortable environment.B(考查动词)Last week I went to Wolong Nature Reserve for a visit. As I 9.was advancing (advance) into the depth of the mountain, I started to discover some golden hair monkeys. They looked so cute, 10.swinging (swing) from branches to branches looking for food. Wolong Nature Reserve is home to giant pandas, golden hair monkeys and other rare animals. It was set up 11.to preserve (preserve) the endangered species from extinction. Every year large numbers of tourists 12.are attracted (attract) here to enjoy the beauty of nature and see the rare animals.C(考查句型)For anyone ing here for a visit, Wang Xizhi Park has many excellent exhibitions, most of 13.which are related to traditional Chinese culture. Wang Xizhi Park is more than a place for relaxation and amusement. You can have fun 14.learning (learn)Chinese calligraphy and painting. It offers you a chance to broaden your horizons as well as 15.appreciate (appreciate) unique Chinese culture. When you are hungry, you can taste 16.whatever you like—food of different flavors. Not only does the food smell delicious, but it is cheap. 17.No wonder it has earned itself a reputation nationwide.Ⅱ.语境短文改错(短文中有5处错误)Football, to me, is less than just a game. From it I have learned to think for others, and realized how important working hard is. Found in 1929, the football team I joined has advanced training facilities available. It also includes a bunch of big names, of them most are the ones I have admired since my childhood. Sweating and bleeding with them have made me growing up quickly. This season, we have had a fantastic start, leaving our team within a reach of Euro 2021 finals.【答案】Football, to me, islessmorethan just a game. From it I have learned to think forothers, and realized how important working hard is.FoundFoundedin 1929, the footballteam I joined has advanced training facilities available. It also includes a bunch of bignames, of themwhommost are the ones I have admired since my childhood. Sweatingand bleeding with them have made me growinggrowup quickly. This season, we havehad a fantastic start, leaving our team within reach of Euro 2021 finals.Ⅲ.根据提示补全句子1.无论走哪一条路你都能到达车站。

安徽省皖南八校2020届高三第三次联考英语试题含答案

安徽省皖南八校2020届高三第三次联考英语试题含答案

皖南八校2020届高三第三次联考英语考生注意:1.本试卷由四个部分组成。

满分150分,考试时间120分钟。

2.考生作答时,请将答案答在答题卡上。

选择题每小题选出答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑;非选择题请用直径0.5毫米黑色墨水签字笔在答题卡上各题的答题区城内作答,超出答题区域书写的答案无效,在试题卷、草稿纸上作答无效。

3.本卷命题范围:高考范围。

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)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。

例:How much is the shirt?A.₤19.15.B. ₤9.18.C. ₤9.15.答案是C。

1. Why didn't Mr. Smith come to work?A. He fell ill at home.B. He had a traffic accident.C. He took someone to hospital.2. How is the weather now?A. The rain has stopped.B. It's raining heavily.C. It rains harder than before,3. What color is the T-shirt?A. Blue. .B. Yellow.C. Red.4. What do we learn from the conversation?A. The speakers didn't recognize each other at first.B. Someone introduced the speakers to each other.C. The speakers recognized each other easily.5. What will the speakers do after dinner?A. Go dancing.B. Go swimming.C. Go shopping.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。

湖北省八校2020届高三5月第二次联考(全国I卷)理综化学试题(word版)

湖北省八校2020届高三5月第二次联考(全国I卷)理综化学试题(word版)

华师一附中黄冈中学黄石二中荆州中学孝感高中襄阳四中襄阳五中鄂南高中2020届高三八校第二次联考理科综合试题命题学校:湖北省黄冈中学命题人:审题人:考试时间:2020年5月13日上午9:00-11:30 试卷满分:150分注意事项:1.答题前,考生务必将自己的姓名、班级、准考证号填写在答题卡上,并将准考证号条形码粘贴在答题卡上的指定位置。

2.选择题的作答:每小题选出答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑,如需改动,用橡皮擦干净后,再选涂其它答案标号。

答在试题卷、草稿纸上无效。

3.填空题和解答题作答:用黑色墨水签字笔将答案直接答在答题卡上对应的答题区域内。

答在试题卷、草稿纸上无效。

4.选考题的作答:先把所选题目的题号在答题卡上指定的位置用2B铅笔涂黑。

考生应根据自己选做的题目准确填涂题号,不得多选。

答题答在答题卡上对应的答题区域内,答在试题卷、草稿纸上无效。

可能用到的相对原子质量:H 1 O 16 Ni 59 La 139 Ce 140第Ⅰ卷(选择题)一、单项选择题:本题共7小题,每小题6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。

7.下列说法正确的是A.纤维素水解的最终产物为葡萄糖,因此可作人体的营养物质B.飞机上用到的氮化镓是合金C.NH4Cl和KOH均可作锌锰电池的电解质D.用稀硝酸洗涤试管内壁附着的银符合绿色化学思想8.对比类推法是一种常用的学习和研究方法。

下列离子方程式的书写正确且类推合理的是9.下列实验能达到实验目的的是A.利用A装置,测定镁铝合金中铝的质量分数B.利用B装置,证明蔗糖属于还原性糖C.利用C装置制备无水FeCl3D.利用D装置,证明金属性:Fe>Cu10.2020年,我省爆发了新型冠状病毒肺炎疫情,严重影响了人民的健康。

茚地那韦或对新型肺炎有治疗效果。

茚地那韦的结构简式如右图所示。

下列有关茚地那韦的说法正确的是A.分子中含氧官能团有羟基和羧基B.苯环上的一溴代物只有五种C.可以发生取代反应和加成反应D.该分子属于合成高分子化合物11. 2019年是“国际化学元素周期表年”。

湖北省华师一附中、黄冈中学等八校联考数学(文)试题(解析版)

湖北省华师一附中、黄冈中学等八校联考数学(文)试题(解析版)

2020届湖北省华师一附中、黄冈中学等八校高三第一次联考数学(文)试题一、单选题1.设i 是虚数单位,若复数()512ia a R i+∈+是纯虚数,则a =( ) A .1- B .1C .2-D .2【答案】C【解析】利用复数代数形式的乘除运算化简,再由实部为0求得a 值. 【详解】∵a 512ii +=+a ()()()51221212i i a i i i -+=+++-是纯虚数, ∴a +2=0,即a =﹣2. 故选:C . 【点睛】本题考查复数代数形式的乘除运算,考查复数的基本概念,是基础题.2.已知集合2560,{|}M x x x =--≤1,16xN y y x ⎧⎫⎪⎪⎛⎫==≥-⎨⎬ ⎪⎝⎭⎪⎪⎩⎭,则( )A .M N ⊆B .N M ⊆C .M N =D .()R M C N ⊆【答案】B【解析】求出集合M ,N ,然后判断M ,N 的关系即可. 【详解】∵M ={x |﹣1≤x ≤6},N ={y |0<y ≤6}, ∴N ⊆M . 故选:B . 【点睛】本题考查了描述法的定义,一元二次不等式的解法,指数函数的值域和单调性,考查了计算能力,属于基础题.3.我国古代数学家赵爽的弦图是由四个全等的直角三角形与-一个小正方形拼成的一个大正方形(如图).如果小正方形的边长为2,大正方形的边长为10,直角三角形中较小的锐角为θ,则c 26os sin πθθπ⎛⎫⎛⎫--= ⎪ ⎭⎝+⎪⎝⎭( )A .510+ B .510-C .D 【答案】D【解析】设出直角三角形中较短的直角边,利用勾股定理求出x 的值,从而求出sinθ,cosθ的值,再利用两角和与差的三角函数公式即可算出结果. 【详解】直角三角形中较短的直角边为x ,则:x 2+(x +2)2=102,解得:x =6, ∴sinθ35=,cosθ45=,∴sin (2πθ-)﹣cos (6πθ+)=﹣cosθ﹣(cosθcos66sin sinππθ-)12=sinθ﹣(12+)cosθ=故选:D . 【点睛】本题考查的知识点是两角和与差的余弦公式,诱导公式,难度不大,属于基础题.4.定义在R 上的奇函数()f x 在(0,)+∞上单调递增,1()03f =.则满足180f log x ⎛⎫ ⎪⎭>⎝的x 取值范围是( ) A .(0,)+∞ B .()10,1,22⎛⎫ ⎪⎝⎭C .110,,282⎛⎫⎛⎫ ⎪⎪⎝⎭⎝⎭ D .10,2⎛⎫⎪⎝⎭【答案】B【解析】由已知结合奇函数的对称性可得,log 18x 13>或13-<log 18x <0,解对数不等式即可求解. 【详解】∵在R 上的奇函数f (x )在(0,+∞)上单调递增. 故函数f (x )在(﹣∞,0)上单调递增,∵f (13)=0, ∴f (13-)=0,则由f (log 18x )>0可得f (log 18x )>f (13), ∴log 18x 13>或13-<log 18x <0,解可得,012x <<或1<x <2.故选:B . 【点睛】本题主要考查了利用奇函数的对称性求解不等式,解题的关键是灵活利用对称. 5.设1331411()11lo 34g ,,4a b c ⎛⎫=== ⎪⎝⎭,则,,a b c 的大小关系是( ) A .a b c << B .c b a <<C .b c a <<D .c a b <<【答案】B【解析】利用对数函数和指数函数的性质求解. 【详解】∵a =log 1314=log 34>1, 11040311,1311()(143)4b c ⎛⎫⎛⎫==<= ⎪ ⎪⎝⎭⎝⎭<= ∴a 最大, 又∵b =(14)14=(164)112,c =(13)13=(181)112,且幂函数y =x 112在(0,+∞)上单调递增, ∴c <b , ∴c <b <a 故选:B . 【点睛】本题考查三个数的大小的求法,是基础题,解题时要认真审题,注意对数函数和指数函数的性质的合理运用.6.已知平面向量()()1,3,4,2a b =-=-,若a b λ-与b 垂直,则λ=( )A .1-B .1C .2-D .2【答案】D【解析】利用向量的运算法则和向量垂直与数量积的关系即可得出. 【详解】∵a b λ-=λ(1,﹣3)﹣(4,﹣2)=(λ﹣4,﹣3λ+2),a b λ-与b 垂直,∴()4λ4a b b λ-⋅=-()﹣2(﹣3λ+2)=0,解得λ=2.故选:D . 【点睛】本题考查向量坐标运算,熟练掌握向量的运算法则和向量垂直与数量积的关系是解题关键.7.圆2244100x y x y +---=上的点到直线140x y +-=的最大距离与最小距离的差是( )A .36B .18C .D .【答案】C【解析】判断直线与圆的位置关系,如果相切或相离最大距离与最小距离的差是直径; 相交时,圆心到直线的距离加上半径为所求. 【详解】圆x 2+y 2﹣4x ﹣4y ﹣10=0的圆心为(2,2),半径为,圆心到到直线x +y ﹣14=0=,故圆上的点到直线的最大距离与最小距离的差是2R = 故选:C . 【点睛】本题考查直线与圆相交的性质,点到直线的距离,是基础题.8.如图茎叶图表示的是甲.乙两人在5次综合测评中的成绩,其中乙中的两个数字被污损,且已知甲,乙两人在5次综合测评中的成绩中位数相等,则乙的平均成绩低于甲的概率为( )A .29B .15C .310D .13【答案】A【解析】根据茎叶图分别求出甲、乙的中位数,平均数,得到模糊成绩的值,利用古典概型求解即可 【详解】由题意可得:甲的成绩为:84、86、91、98、98;中位数为91,平均数为4575; 乙的成绩为:86,88,90+x ,90+y ,99 (x ≤y ); ∵甲,乙中位数相同;∴90+x =91⇒x =1; 乙的平均数为4545y+; ∵乙的平均成绩低于甲; ∴1≤y <3;⇒y =1或2. ∴乙的平均成绩低于甲的概率p 29=; 故选:A . 【点睛】本题考查了茎叶图,以及中位数、平均数的性质及古典概型,考查了学生的计算能力,属于基础题.9. ABC 的内角,,A B C 的对边分别为,,a b c ,已知()0sinB sinA sinC cosC -+=,2,a c ==则角C =( )A .56π B .6π C .4π D .3π 【答案】B【解析】利用三角恒等变换求出A ,再利用正弦定理求出C . 【详解】sin B ﹣sin A (sin C +cos C )=0,sin A cos C +cos A sin C ﹣sin A sin C ﹣sin A cos C =0,得cos A sin C =sin A sin C ,因为()0,,sin 0C C π∈≠ 所以sin A =cos A ,则tan A =1,A 4π=,又a sinA =,则sin C 12=,故C 6π=或者56π, 因为c <a ,C <A , 故C 6π=,故选:B . 【点睛】考查三角形的恒等变换,正弦定理、和内角和定理的运用,考查运算能力,注意大边对大角的应用,属于基础题.10.在 ABC 中,,A B 分别是双曲线E 的左、右焦点,点C 在E 上若0BA BC =,()0BA BC AC +=,则双曲线E 的离心率为( )A 1B 1C .12D .12【答案】B【解析】由(BA BC +)AC ⋅=0,得AB =BC ,结合BA BC ⋅=0,得△ABC 是一个等腰直角三角形,求出AC 的长,再利用双曲线的定义建立a 与c 的关系式,即可求出离心率. 【详解】∵(BA BC +)AC ⋅=0,又AC BC BA =-, ∴(BA BC +)•(BC BA -)220BC BA =-=, 则|BC |=|BA |,即BA =BC ,又BA BC ⋅=0,∴△ABC 是一个等腰直角三角形, 由题意得:C 点在双曲线的右支上,∴AB =BC =2c ,AC =,又AC ﹣BC =2a ,即c ﹣2c =2a ,解得离心率e 1=, 故选:B .【点睛】本题考查了平面向量的数量积的性质,考查了双曲线的定义和性质,考查运算能力,属于中档题.11.《九章算术》给出求羡除体积的“术”是:“并三广,以深乘之,又以袤乘之,六而一”,其中的“广”指羡除的三条平行侧棱的长,“深”指一条侧棱到另两条侧棱所在平面的距离,“袤”指这两条侧棱所在平行线之间的距离,用现代语言描述:在羡除111ABC A B C -中,111AA //BB //CC ,1AA a =,1BB b =,1CC c =,两条平行线1AA 与1BB 间的距离为h ,直线1CC 到平面11AA B B 的距离为h',则该羡除的体积为()hh'V a b c .6=++已知某羡除的三视图如图所示,则该羡除的体积为( )A .B .53C .43D .【答案】B【解析】根据三视图求出羡除的体积()hh'V a b c 6=++中所需数据,代入得答案. 【详解】由三视图还原原几何体知,羡除111ABC A B C -中,AB//EF ,底面ABCD 是矩形,AB CD 2==,EF 1=,平面ADE ⊥平面ABCD ,AB ,CD 间的距离h AD 2==, 如图,取AD 中点G ,连接EG ,则EG ⊥平面ABCD , 由侧视图知,直线EF 到平面ABCD 的距离为h'1=,∴该羡除的体积为()()hh'125V a b c 221663⨯=++=++=. 故选:B .【点睛】本题考查了几何体的三视图及体积的计算,在由三视图还原为空间几何体的实际形状时,要根据三视图的规则,空间几何体的可见轮廓线在三视图中为实线,不可见轮廓线在三视图中为虚线。

江西省八所重点高中2020届高三5月联考英语试卷(有答案)

江西省八所重点高中2020届高三5月联考英语试卷(有答案)
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2025届湖北新八校协作体高三10月联考数学试卷答案

2025届湖北新八校协作体高三10月联考数学试卷答案

2024年湖北省新八校协作体高三10月联考高三数学试卷参考答案1-4ADBD9.B 5-8 CBCC D 10.BCD 11.AD 12.513.-414.),[+∞-e 14.【详解】32()f x x px x q =+++,2()321f x x px +'=+,()62f x x p =+'',因为()f x 图象的对称中心点为(1,2)-,所以(1)620f p -=-+'=',所以3p =,由(1)1312f q -=-+-+=,所以1q =,f(x)=1323+++x x x 原不等式为ee x x e x x mx e ]1[)1(ln ++≤+-,因为(1,)x ∈+∞,所以≥m 设()e 1t g t t =--,则()e 1t g t '=-,当0t <时,()0g t '<,当0t >时,()0g t '>,所以当0t <时,()g t 单调递减,当0t >时,()g t 单调递增,所以()(0)0g t g ≥=,即e 1≥+t t ,因为eln e eln 1x x x x -≥-+,当且仅当eln 0x x -=,即e x =时等号成立,所以eln e (1e)eln 1(1e)e ln 1ln 1x x x x x x x x --++-+-++≥=-++,所以其最小值为e -,故m e -≥.15.解:(1)由x x f x f 21)1(2)(+-'=',取1x =得到21)1(2)1(+-'='f f ,解得1)1(-='f . 2分代入可得xx x x f ln 2)(2+--= 5分(2)2,2+='+=x x e y x e y 对于曲线1331)1,0(2+==-+=x y x y x e y x ,即处的切线方程为:在点曲线 8分13)ln ,)(ln )(00+=++=x y a x x x g a x x g 的切线为在点(,设 分,且1113ln 31000+=+=∴x a x x3ln 2+=a 则 13分16.解:(1)分523132sin(2sin 2122cos 3312cos 212sin 2122cos 1)31()cos (sin 212sin 2122cos 1)31(4sin()4sin(cos sin cos 31()(222 -+-=+--=-++-=-+++-=-+++-=πππx x x x x x x x x x x x x x x x f ()f x ∴的最小正周期为22ππ=. 7分分的单调增区间为故解得故分上单调递增在)(15],1211[],125,0[)(],1211[],125,0[]35,23[],2,3[3211]35,23[],2,3[sin ]35,3[,322 ππππππππππππππππππx f x x t t y t x t ∈-∈--∈=-∈-=17.解析(I)由cos sin 0b C C a c +--=及正弦定理得sin cos sin sin sin 0B C B C A C --=.因为()()sin sin sin sin cos cos sin A B C B C B C B C π=--=+=+,sin cos sin sin 0B C B C C --=. 5分由于sin 0C ≠,cos 10B B --=所以1sin 62B π⎛⎫-= ⎪⎝⎭.又0B π<<,故3B π=.7分(II )[方法一]:余弦定理基本不等式因为3B π=,并利用余弦定理整理得222b a c ac =+-,即223()ac a c b =+-.结合22a c ac +⎛⎫≤ ⎪⎝⎭,得2a c b +≤.由临界状态(不妨取2A π=)可知a c b+= 10分而ABC V为锐角三角形,所以a c b+>由余弦定理得2222221cos cos cos 222b c a a b c A B C bc ab+-+-++=++,222b a c ac =+-,代入化简得1cos cos cos 12a c A B C b +⎛⎫++= ⎪⎝⎭故cos cos cos A B C ++的取值范围是13,22⎛⎤ ⎥ ⎝⎦. 15分[方法二]【最优解】:恒等变换三角函数性质结合(1)的结论有:12cos cos cos cos cos 23A B C A A π⎛⎫++=++- ⎪⎝⎭11cos cos 22A A A =-+11cos 22A A =++ 10分1sin 62A π⎛⎫=++ ⎪⎝⎭.由203202A A πππ⎧<-<⎪⎪⎨⎪<<⎪⎩可得:62A ππ<<, 12分2363A πππ<+<,则sin 6A π⎤⎛⎫+∈⎥ ⎪⎝⎭⎝⎦,113sin ,6222A π⎤+⎛⎫++∈⎥ ⎪⎝⎭⎝⎦.即cos cos cos A B C ++的取值范围是13,22⎛⎤ ⎥ ⎝⎦. 15分18.【详解】(1)由题意,x x V 2)23(-=,230<<x2分)230)(63)(23()(<<--='x x x x V 由210)(=⇒='x x V ,当210<<x 时函数递增,当2321<<x 时函数递减,所以当21=x 时,盒的容积V 最大. 6分(2)212249)63)(23()(x x x x x V +-=--=' ∴)ln()(m x e x f x +-= 8分当2(,),m x m -∈≤+∞时,ln()ln(2)x m x ++≤,故只需证明当2m =时,()ln(2)0x f x e x =-+>, 10分当2m =时,函数 x y e =与函数12y x =-+在(2, )-+∞上单调递增,所以函数()12x f x e x '=-+在(2, )-+∞上单调递增,又(1)0,(0)0f f ''-<>,故()0f x '=在(2, )-+∞有唯一实数根,记为0x x =,且0(1,0)x ∈-,分12 当0(2,)x x ∈-时,()0,()f x f x '<单调递减;当0(,)x x ∈+∞时,()0,()f x f x '>单调递增,从而当0x x =时,()f x 取得最小值,由0()0f x '=得0012x ex =+即00ln(2)-x x +=,分14 故的最小值)(x f >0综上,当m ≤2时,()0f x >. 17分19.解:(1)10,sin 2y x x π⎛⎫=∈ ⎪⎝⎭2cos -sin x y x '∴=,分2 24sin (1cos )0,sin 2x x y x x π+⎛⎫''∴=∈ ⎪⎝⎭>0,,函数10,sin 2y x x π⎛⎫=∈ ⎪⎝⎭在为凹函数.分4 (2)由(1)可知函数()10,sin 2f x x x π⎛⎫=∈ ⎪⎝⎭在为凹函数.所以由琴生不等式()()()312123(33f x f x f x x x x f ++++≥分6 2223111sin sin sin 12,222sin()3C A B A B C ++≥=++可得分8 1116sin sin sin 222A B C ∴++≥,得证 .当且仅当C B A ==时等号成立.分9 (3)构造函数()ln g x x x =,()1+ln g x x '=,()1g x x''=>0,()ln g x x x ∴=为凹函数.)()(11∑∑==≥∴n i i ni i nx g n x g 1ln 111ln ,n i i i x x g n n n n =⎛⎫∴≥=⋅ ⎪⎝⎭∑11ln ln ,n i i i x x n =≥∑12121n x x x n x x x n⋅≥ 即得证.分17。

2020届湖北省八校高三第二次联考地理试题(解析版)

华师一附中黄冈中学黄石二中荆州中学孝感高中襄阳四中襄阳五中鄂南高中2020届高三八校第二次联考文科综合试题命题学校:华师一附中试卷满分:300分考试时长:150分钟·注意事项: 1.答卷前,考生务必将自己的姓名、考生号等填写在答题卡和试卷指定位置上。

2.回答选择题时,选出每小题答案后,用铅笔把答题卡上对应题目的答案标号涂黑。

如需改动,用橡皮擦干净后,再选涂其他答案标号。

回答非选择题时,将答案写在答题卡上,写在本试卷上无效。

3.考试结束后,将本试卷和答题卡一并交回。

一、选择题:本题共35小题,每小题4分,共140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。

武汉四环线(如图)位于绕城高述和三环线之间,沿途经6个新城区和沌口、东湖、临空港三大国家级经济开发区,全长约143千米,绝大部分为新建高架道路,采用设计时速100千米、双向八车道高速公路标准建设。

四环线工程对巩固提升武汉综合交通枢纽地位的意义重大。

据此完成1~3题。

1.武汉四环线采用双向八车道高速公路标准建设的主要目的是()A. 降低建设成本B. 增加连接区域C. 节约土地面积D. 提高通行效率2.四环线东南角一段与外环线重合的主要影响因素是()A. 地质条件B. 生态环境C. 工程投资D. 施工难度3.武汉四环的全线通车将会()A. 加快工业向新城区聚集B. 扩大武汉城市范围C. 改善沿线环境质量D. 加大城市运输成本2017年末,北京市常住人口2170.7万人,比上年末减少2.2万人,这是自2000年以来首次出现负增长。

2018年末常住人口比上年末减少16万人,2019年末减少0.6万人。

“关于制定北京市国民经济和社会发展第十三个五年规划的建议”中指出,北京市要加强治理“大城市病”,全面落实疏解非首都功能。

据此完成4~5题。

4.近三年,北京市常住人口持续减少的主要原因是()A. 房价大幅上涨B. 产业结构调整C. 城市人才争夺D. 空气污染加重5.北京市在全面落实疏解非首都功能中,以下需要最先退出的是()A. 金融中心B. 文化中心C. 物流中心D. 科研中心塔希提岛(如图)位于南太平洋,年降雨量2500毫米以上,沿海有肥沃的平原,许多热带花卉生长在岛上,塔希提已成为重要的花卉基地。

安徽省皖南八校2020届高三第三次联考英语试题 Word版(答案在PDF版中)

皖南八校2020届高三第三次联考英语考生注意:1.本试卷由四个部分组成。

满分150分,考试时间120分钟。

2.考生作答时,请将答案答在答题卡上。

选择题每小题选出答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑;非选择题请用直径0.5毫米黑色墨水签字笔在答题卡上各题的答题区城内作答,超出答题区域书写的答案无效,在试题卷、草稿纸上作答无效。

3.本卷命题范围:高考范围。

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)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。

例:How much is the shirt?A.₤19.15.B. ₤9.18.C. ₤9.15.答案是C。

1. Why didn't Mr. Smith come to work?A. He fell ill at home.B. He had a traffic accident.C. He took someone to hospital.2. How is the weather now?A. The rain has stopped.B. It's raining heavily.C. It rains harder than before,3. What color is the T-shirt?A. Blue. .B. Yellow.C. Red.4. What do we learn from the conversation?A. The speakers didn't recognize each other at first.B. Someone introduced the speakers to each other.C. The speakers recognized each other easily.5. What will the speakers do after dinner?A. Go dancing.B. Go swimming.C. Go shopping.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。

八校2020届高三物理上学期第一次联考试题含解析

7.在大型物流货场,广泛的应用传送带搬运货物.如图甲所示,与水平面倾斜的传送带以恒定的速率运动,皮带始终是绷紧的,将m=1kg的货物放在传送带上的A端,经过1。2s到达传送带的B端.用速度传感器测得货物与传送带的速度v随时间t变化的图象如图乙所示.已知重力加速度g=10m/s2,则可知( )
A. 货物与传送带间的动摩擦因数为0。5
(2)[3].改装后电压表量程为U=6V,由
I2g(r2g+R2)=U
解得
R2=8000Ω
即电阻箱接入电路的阻值为8000Ω。
(3)[4].由于待测电阻的阻值远大于滑动变阻器的阻值,所以需要设计成滑动变阻器分压接法,将电阻箱与电流表A2串联后并联在待测电阻两端,由于改装后的电压表内阻已知,所以采用电流表外接法。
CD.当OPQ在同一直线时,P点沿杆方向的速度为零,则活塞运动的速度等于0,选项CD错误;
4。为了探测某星球,载着登陆舱的探测飞船在以该星球中心为圆心,半径为r1的圆轨道上运动,周期为T1,总质量为m1,环绕速度为v1。随后登陆舱脱离飞船,变轨到离该星球更近的半径为r2的圆轨道上运动环绕速度为v2,周期为T2,登陆舱的质量为m2,引力常量为G,则( )
B、D、由光电效应方程 和 可知遏止电压越大时,对应的光的频率越大,故 ;三种光照射同一金属,飞出的光电子的最大初动能关系为 ;故B,D均错误.
C、光在同种介质中传播的速度相同,由 可得, ;故C正确。
故选C。
2。M、N是某电场中一条电场线上的两点,从M点由静止释放一质子,质子仅在电场力的作用下沿电场线由M点运动到N点,其电势能随位移变化的关系如图所示,则下列说法正确的是
样车受到的安培力即电磁驱动力
联立解得
选项A正确;
B.样车速度为零时,线圈的电热功率

2020届湖北八校第二次联考参考答案 (1)

华师一附中黄冈中学黄石二中荆州中学孝感高中襄阳四中襄阳五中鄂南高中2020 届高三八校第二次联考语文试题参考答案1.A【解析】B项主观臆断,C项曲解原意,“放心”并非放下心来,乃放纵己心,D项无中生有。

2.A【解析】 A项“逐层递进地分析”有误,应该是并列结构3.D【解析】 D 幽居汴京的李煜不是中国文化当下精神的代表。

4.D【解析】材料二中并未提及长征五号发射的成败核心在于原始发现上有无实现突破,且材料三中的“攻克关键核心技术,必须要在原创研究、原始发现上实现突破”并不专门针对长征五号的成败。

5.C 【解析】从材料二中可知此次复飞成功成为中国航天2019年最具标志性的任务在于它是以直观的方式将科学试验由失败走向成功的过程呈现到公众面前。

6.①材料一侧重展望2020年,介绍长征五号的复飞成功为中国航天的未来发展打下坚实基础;②材料二侧重回首过去,介绍长征五号发射成功背后一波三折的研发过程;③材料三侧重从国家战略的高度介绍国家发展离不开科技创新的强有力支撑,突出其重要性。

(每点给2分,其他答案言之成理酌情给分)7.D【解析】散文侧重旨在赞美传统手工艺人精湛绝伦的技艺,匠人恭喜农人的话正是文章主旨的生动再现,D项的解读是对原文主旨的曲解。

8、①运用拟人手法,将“棉花”和“风”人格化,(2分)②生动地描写出棉花在阳光下、在微风中舒展开来的情态,(2分)③表现了作者内心的喜悦之情,为下文赞美劳动蓄势铺垫。

(2分)9、①“棉之舞”既是指棉花在匠人劳作时“飞舞”、“翻腾”、“翩跹”的情态,(2分)②又是指弹棉匠人在弹棉花时的动作、节奏、声音等,完全是一场优美的舞蹈。

(2分)③“棉之舞”包含着作者对匠人精湛的弹棉技艺的赞美,更是对劳动的赞美。

(2分)10.D11.C 省试:乡试,是每三年一次在省城举行。

12.B 是胡梅林偶尔忘了嘱托知县。

13.(1)你要让我成为你的宾客,应当备办贵宾的礼节,我要随时能够出入贵府。

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