第二次测试9.15
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2021年下学期九年级第二次综合素养评价 (英语)试卷考试总分:95 分考试时间: 120 分钟学校:__________ 班级:__________ 姓名:__________ 考号:__________一、单选题(本题共计 10 小题,每题 5 分,共计50分)1. ﹣Dad there is________hole in my left shoe. Can you huy me a new pair?﹣OK.let's go to the mall tomorrow.( )A.aB.anC.theD./2. ﹣﹣﹣How about the pollution in the countryside?﹣﹣﹣Luckily,it's not as serious as _______ in the big cities.( )A.itB.thatC.oneD.those3. —Do you like swimming?—Yes, swimming is a good way ________ fit.A.keepB.to keepC.keeping4. He likes collecting stamps. Most of his money ________ on stamps.A.spendsB.is spentC.spent5. It was ______ late when we got home. The children were sleeping, so we walked into the house ______.A.quiet; quitelyB.quite; quitelyC.quite; quietlyD.quiet; quietly6. There are some trees ________ the school ________ my home.A.between; andB.between; withC.both; andD.both; with7. —What is this ______ English?—It's a map.A.onB.inC.forD.at8. The 2sisters didn't go to bed________they finished their homework last night.( )A.untilB.becauseC.whenD.if9. —Excuse me! Do you know ______?—It's two kilometers away from here.A.where is the supermarketB.when does the supermarket openC.where the supermarket isD.when the supermarket opens10.—Could you please tell me where the post office is?—_______. Go along this street and turn left.A.SureB.Sorry, I don't knowC.Yes, I canD.Sorry, I'd love to二、完形填空(本题共计 1 小题,共计5分)11.(5分)For many students, they can get to school easily. But for me, it is very(1)______. My name is Zhao Kai. I live in a small village(2)______ my grandparents, because my parents(3)______ to the city to work. My school is(4)______ from my home and my grandparents are old,(5)______ they can't take me to school. And the road(道路)is not good. I can't(6)______ my bike. I must walk to school. I need to(7)______ at 5:30 every morning, and I have no(8)______ for breakfast at home. I always have breakfast on my way to school. It usually(9)______ me one hour to walk to school, but I am(10)______ late for school. I'm good with my teachers and classmates and I study hard at school.(1)D.interesting(2)A.ofB.withC.atD.in(3)A.runB.leaveC.goD.sell(4)A.longB.shortC.farD.big(5)A.andB.soC.orD.but(6)A.makeB.takeC.driveD.ride(7)A.think ofB.get upC.look atD.go to bed(8)D.day(9)A.playsB.helpsC.takesD.stops(10)uallyB.alwaysC.sometimesD.never三、阅读理解(本题共计 7 小题,每题 5 分,共计35分)12.WonderlandBeach Road, Fun IslandOpening hours: Tuesday-Friday, 10 a.m.-6 p.m.Saturday & Sunday, 9 a.m.-8 p.m.Tickets:One park Two parksAdults$20$32Old people(over 65)$10$16Children(3~10)$12$12●Free for children under 3. Anyone who is 11 years old or over needs to buy an adult ticket.●The two-park tickets are available for only a day. In other words, you can't visit the twoparks on different days.(1)If Mr. White and Mrs. White(both 45 years old)with their twelve-year-old son want to visit the two parks in Wonderland, how much should they pay?A.$52.B.$60.D.$96.(2)Who can visit the Wonderland without paying for a ticket?A.Jane, who is a two-year-old girl.B.Mike, who is a ten-year-old student.C.Frank, who is a twenty-year-old teacher.D.Mary, who is a seventy-year-old businesswoman.(3)When can people visit Wonderland?A.At 9:30 a.m. on Wednesday.B.At 7:30 p.m. on Sunday.C.At 7:00 p.m. on Thursday.D.At 8:30 a.m. on Saturday.(4)Which of the following is NOT true?A.It is open every day except Monday.B.It is open for eight hours on Thursday.C.You can't visit the two parks on the same day.D.Eleven-year-old John should buy an adult ticket.13.IT'S MY BIRTHDAYAnn hopes you can come to her party!Time Five forty in the afternoonDate Monday, July 14thPlace Flat 9B Westing TowerPhone875-4615Note The more friends, the better.(1)Ann is going to have a ________.A.birthday partyB.Christmas partyC.New Year party(2)The party will begin at ________.A.6:20 amB.5:40 amC.5:40 pm(3)What does "the more friends, the better" mean?A.No friends will come to her party.B.More friends will come to her party.C.Ann wants more friends to come to her party.In our life, we may meet persons with different personalities(性格). What is your personality type? Read about the following and find out.★ A Dreamer thinks there is a "right" way to do things. This person wants to live in the "perfect world". Many are good listeners and like to help others. Many Dreamers work as teachers, and often lead others. Famous Dreamers: Mahatma Gandhi(圣雄甘地), Angelina Julie.★ A Partner wants to be in a group. For this person, rules are important. They consider tradition to be of great value. Partners are often serious, careful people. Many do well as teachers, managers and police officers. Famous Partners: Queen Elizabeth Ⅱ, Mother Teresa.★ For Thinkers, understanding things is very important. They like to deal with problems and make new things. Thinkers can also be active. They like to win. They have very strong opinions. Many Thinkers work as scientists, inventors and engineers. Famous Thinkers: Bill Gates, Stephen Hawking.★ Artists want to be free. They don't want to follow the rules all the time. They also like trying new things. Like Thinkers, many Artists have strong opinions. They are creative and do well as musicians and actors. Famous Artists: American famous singer Madonna.(1)How many kinds of personality types are mentioned in the passage?A.Two.B.Four.C.Six.D.Eight.(2)According to the passage, when you need help, ________ may give you a hand.A.ArtistsB.PartnersC.ThinkersD.Dreamers(3)If you are active and like to win, maybe you are similar to ________.A.GandhiB.Mother TeresaC.Bill GatesD.Madonna(4)You may choose a job as ________ if you are careful and serious.A.a playerB.an actorC.a police officerD.a scientist(5)Tu Youyou, a Chinese scientist, just won the Noble Prize. She's probably ________.A.a thinkerB.a partnerC.a dreamerD.an artist15.Tips for teenagersStep 1: Be active in classSpeaking up in class might be difficult, but it helps to make you feel more confident and improve your ability to express yourself. It's okay if you give the wrong answer. All smart students do and your classmates won't really mind.Step 2: ________Nobody can work well when they are tired. Make sure you get enough sleep at night and take breaks from time to time while studying.Step 3: Develop healthy habitsStarting your young life with good habits sets you up for a healthy future. Get regular(定期的)exercise, eat a healthy diet, and keep your hygiene(保持卫生).Step 4: Keep your stress under controlThough you might be busy with your studies every day, you should spend time having fun and enjoying life. Join a sports team, read a book, learn to paint, or watch a good movie; whatever you need to do to help reduce stress, make time for it.(1)According to the tips, what can help you become confident?A.Speaking up in class.B.Talking with your friends.C.Having good sleeping habits.D.Winning competitions.(2)What is Step 2 not about?A.Having a good sleep.B.Working hard.C.Spending more time taking breaks.D.Getting enough rest.(3)To develop good habits, you can ________.a. exercise regularlyb. eat healthy foodc. watch games on TVd. keep your hygieneA.abcB.abdC.acdD.bcd(4)Steps 4 tells us to ________.A.keep enough stressB.study all the time everydayC.study hard with fun and less stressD.develop different kinds of hobbies(5)These tips can help teenagers ________.A.find a job in the futureB.make more friendsC.live healthy livesD.get good grades on tests17. 根据上下文内容,将文中画线部分译成汉语或者英语。
初三数学第二学期第二次质量检测本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分;共8页;满分120分;考试时间为120分钟.第Ⅰ卷(选择题 共48分)一、选择题(共12个小题;每小题4分;共48分) 在每个小题给出的四个备选答案中;只有一个是符合题目要求的;请将你认为符合题目要求的答案选出来.1.-5的绝对值是( )A .5B .-5C .±5D .51 2.据测算;我国每年因沙漠化造成的直接经济损失超过5400000万元;用科学记数法表示这个数;应记为( )A .51054⨯万元B .6104.5⨯万元C .5104.5⨯万元D .71054.0⨯万元 3.下列二次根式中属于最简二次根式的是( ) A .2xB .8C .2xD .12+x 4.甲、乙两人在相同的情况下;各射靶10次;两人命中环数的平均数7==乙甲x x ;方差32=甲S ,22=乙S ;则射击成绩较稳定的是( ) A .甲 B .乙 C .一样 D .不能确定 5.若∠A 是锐角;且sinA =cosA ;则∠A 的度数是( )A .30°B .45°C .60°D .90° 6.如图;到△ABC 的三个顶点距离相等的点是△ABC 的( )A .三条中线的交点B .三条角平分线的交点C .三条高线的交点D .三条边的垂直平分线的交点7.已知AB 、CD 是⊙O 的两条直径;则四边形ABCD 一定是( )A .等腰梯形B .菱形C .矩形D .正方形8.函数211--+=x x y 中;自变量x 的取值范围是( ) A .x ≥-1 B .x >-1且x ≠2 C .x ≠2 D .x ≥-1且x ≠29.如图;在△ABC 中;若∠AED =∠B ;DE =6;AB =10;AE =8;则BC 的长为( ) A .415 B .7 C .215 D .52410.下列说法:①如果两个三角形的周长之比是2:3;那么这两个三角形的面积之比是3∶4; ②平行四边形是中心对称图形; ③经过三点有且只有一个圆; ④化简a 1-的结果是aa -. 其中正确命题的个数是( )A .4B .3C .2D .111.如图;P (x ;y )是以坐标原点为圆心;5为半径的圆周上的点;若x 、y 都是整数;则这样的点共有( )A .4个B .8个C .12个D .16个12.一家三人(父亲、母亲、女儿)准备参加旅行团外出旅游;甲旅行社告知:“父母买全票价;女儿按半价优惠”;乙方旅行社告知:“家庭旅游可按团体票计价;即每人均按全票价的54收费”;若这两家旅行社每人的全票价相同;则优惠条件是( ) A .甲比乙更优惠 B .乙比甲更优惠 C .甲与乙优惠条件相同 D .与原票价有关第Ⅱ卷(非选择题 共72分)二、填空题(共4个小题;每小题4分;共16分) 13.化简:=-+11x x__________________. 14.若点(m ;-m)在反比例函数xky =的图象上;则k_______0(填“>”或“<”) 15.已知两圆的半径分别是一元二次方程01272=+-x x 的两个根;若两圆的圆心距为5;则这两个圆的位置关系是__________.16.己知两个任意正数a 和b ;有下列命题:(1)若a +b =2;则1≤ab ; (2)若21=+b a ;则41≤ab ; (3)若2=+b a ;则22≤ab . 根据以上三个命题所提供的规律;试猜想出a +b 与ab 应满足的最佳关系式:______________________;三、解答题(共7个小题;共56分) 17.(本题满分9分)(1)(5分)计算:()12200432212101----+⎪⎭⎫ ⎝⎛-(2)(4分)分解因式:y x y x x +--23 18.(本题满分8分)解不等式组:()()⎪⎩⎪⎨⎧<+-+--≤+,121331,341082x x x x 并求出其整数解.19.(本题满分7分)已知:如图;四边形ABCD 是等腰梯形;AB =DC ;AD ∥BC ;点E 在AD 上;且EB =EC ;试问点E 是AD 的中点吗?若是;请给出证明;若不是;请说明理由.20.(本题满分8分)已知;如图;折叠矩形ABCD 的一边AD ;使点D 落在BC 边的点F 处;若折痕cm AE 55=;且43tan =∠EFC . (1)证明:△AFB ∽△FEC ; (2)求矩形ABCD 的周长.21.(本题满分8分)对于上抛物体;在不计空气阻力的情况下;有如下关系式:2021gt t v h -=;其中h(米)是上抛物体上升的高度;0v (米/秒)是上抛物体的初速度;g (2/秒米)是重力加速度;t (秒)是物体抛出后所经过的时间;如图是h 与t 的函数关系图.(1)求:0v 和g ;(2)几秒后;物体在离抛出点25米高的地方?22.(本题满分8分)如图;⊙O '经过⊙O 的圆心;E 、F 是两圆的交点;直线OO '交⊙O '于点P ;交EF 于点C ;交⊙O 于点Q ;且152=EF ;41sin =∠P . (1)求证:PE 是⊙O 的切线;(2)求⊙O 和⊙O '的半径的长; (3)若点A 在劣弧上运动(与点Q 、F 不重合);连结PA 交劣弧于点B ;连结BC并延长交⊙O 于点G ;设CG =x ;PA =y ;求y 关于x 的函数关系式;并写出自变量x 的取值范围.23.(本题满分8分)如图;直线l 与x 轴、y 轴的正半轴分别交于A 、B 两点;OA 、OB 的长分别是关于x 的方程0)2(4142=++-AB x x 的两个根(OB >OA );P 是直线l 上A 、B 两点之间的一动点(不与A 、B 重合);PQ ∥OB 交OA 于点Q .(1)求tan ∠BAO 的值;(2)若OQPB PAQ S S 四边形31=∆时;请确定点P 在AB 上的位置;并求出线段PQ 的长;(3)当点P 在线段AB 上运动时;在y 轴上是否存在点M ;使△MPQ 为等腰直角三角形;若存在;请直接写出点M 的坐标;若不存在;请说明理由.参考答案题号 1 2 3 4 5 6 7 8 9 10 11 12 答案ABDBBDCDCDCB二、填空题(共4个小题;每个小题4分;共16分)13.11+-x ; 14.<; 15.相交; 16.ab 2b a ≥+(或ab b a ≥+2)三、解答题(共7个小题;共56分) 17.(本题满分9分) (1)(5分)计算:()12200432212101----+⎪⎭⎫ ⎝⎛-解:原式=()13223210-+-+ …………………………………………… 4分=5.…………………………………………………………………… 5分(2)(4分)分解因式:y x y x x +--23解法1:原式=()()y x y x x ---23 …………………………………………… 1分=()()y x y x x ---2 …………………………………………… 2分 =()()12--x y x ………………………………………………… 3分 =(x -y )(x +y )(x -1) …………………………………… 4分解法2:原式=()()y y x x x ---23 …………………………………………… 1分=()()1122---x y x x …………………………………………… 2分 =()()y x x --12 ………………………………………………… 3分=(x -1)(x +1)(x -y). …………………………………… 4分 18.(本题满分8分)解:解不等式2(x +8)≤10-4(x -3);得x ≤1. ……………………………………………………………………… 2分解不等式121331<+-+x x ;得 x >-1 ……………………………………………………………………… 4分∴ 这个不等式组的解集为-1<x ≤1. …………………………………………… 6分 ∴ 这个不等式组的整数解为0;1. ……………………………………………… 8分 19.(本题满分7分)解:点E 是AD 的中点. …………………………………………………………… 1分 证明:∵ AD ∥BC ;AB =CD ;∴ ∠ABC =∠DCB …………………………………………………………………… 2分 ∵ EB =EC ;∴ ∠EBC =∠ECB …………………………………………………………………… 3分 ∴ ∠ABE =∠DCE …………………………………………………………………… 4分 ∴ △ABE ≌△DCE . ………………………………………………………………… 6分 ∴ AE =DE ;即点E 是AD 的中点. ……………………………………………… 7分20.(本题满分8分)解(1)∵四边形ABCD 是矩形;∴ ∠B =∠C =∠D =90°. ………………………………………………………… 1分 由题意;得Rt △ADE ≌Rt △AFE ;∴ ∠AFE =∠D =90°. ……………………………………………………………… 2分 ∴ ∠AFB +∠EFC =90°; 又∵ ∠EFC +∠FEC =90°;∴ ∠AFB =∠FEC . …………………………………………………………………… 3分 ∴ △AFB ∽△FEC . …………………………………………………………………… 4分 (2)由43tan =∠EFC ;可设EC =3k (k >0〕;则FC =4k .在Rt △ECF 中;EF =5k . ∴ DE =5k .∴ DC =AB =8k . ……………………………………………………………………… 5分 又∵ △ABF ∽△FCE ;∴CE BF FC AB =;即k BFk k 348=; ∴ BF =6k .∴ AF =10k . ………………………………………………………………………… 6分 在Rt △AFE 中;222AE EF AF =+; ∴ ()()()22255510=+k k ;∴ k =1(cm )(取正值). …………………………………………………………… 7分 ∴ 四边形ABCD 的周长=2(AB +BC )=2(8+10)=36(cm ) ………………… 8分 21.(本题满分8分) 解:(1)由图可知;2021gt t v h -=的图像经过(6;0)、(3;45)点; … 1分 ∴ ⎪⎩⎪⎨⎧-=-=.29345,186000g v g v …………………………………………………………………… 3分解这个方程组;得300=v ;g =10.∴ 300=v (米/秒);g =10(2/秒米). ………………………………………… 4分 (2)由(1)得;函数关系式是2530t t h -=. …………………………………… 5分 当h =25时;则255302=-t t . …………………………………………………… 6分 解这个方程;得11=t ;52=t . …………………………………………………… 7分 ∴ 经过1秒或5秒的物体在离抛出点25米高的地方. ………………………… 8分 22.(本题满分8分) 解:(1)连结OE . ∵ OP 是⊙O '的直径;∴ ∠OEP =90°;∴ PE 是⊙O 的切线. ………………………………………………………………… 2分 (2)设⊙O 、⊙O '的半径分别为r ;r '. ∵ ⊙O 与⊙O '交于E 、F ;∴ EF ⊥OO ';1521==EF EC . ∴ 在Rt △EOC 、Rt △POE 中;∠OEC =∠OPE . ∴ sin ∠OEC =sin ∠OPE =41. ∴ 41sin ===∠r OC OE OC OEC . 即r OC 41=; …………………………………………………………………………… 3分 ∴ 1516122=-r r ;解得r =4. Rt △OPE 中;r rOP OE OPE '==∠2sin . ∴ r '=8. …………………………………………………………………………… 4分 (3)连结OA .∵ ∠OEP =90°;CE ⊥OP ; ∴ PO PC PE ·2=. 又∵ PE 是⊙O 的切线; ∴ PA PB PE ·2=; ∴ PC ·PO =PB ·PA .即 POPBPA PC =………………………………………………………………………… 5分 又∵ ∠CPB =∠APO ; ∴ △CPB ∽△APO ; ∴PAPCOA BC =; ∴ PABC 60=. 由相交弦定理;得BC ·CG =CF ·CE ; ∴ CGBC 15=. ……………………………………………………………………… 7分 ∴ PA =4CG ; 即y =4x (515<<x ). …………………………………………………………… 8分 23.(本题满分8分)解:(1)由已知可得⎩⎨⎧+==+),2(4·,14AB OB OA OB OA又∵ 222AB OB OA =+;∴ ()222AB OB OA OB OA =⋅-+;即()222814AB AB =+-. ∴ 018082=-+AB AB .∴ AB =10或AB =-18(不合题意;舍去).∴ AB =10; …………………………………………………………………………… 2分 ∴ 048142=+-x x . 解得 61=x ;82=x .∵ OB >OA ; ∴ OA =6;OB =8. ∴ 34tan ==∠OA OB BAO ……………………………………………………………… 4分 (2)∵ OQPB PAQ S S 四边形31=∆;∴ AOB PAQ S S ∆∆=41. ∵ PQ ∥BO ;∴ △PQA ∽△BOA . ∴41S S BO PQ AB AP BOA PQA 22==⎪⎭⎫⎝⎛=⎪⎭⎫ ⎝⎛∆∆. 5分 ∴21=AB AP . ∵ AB =10; ∴ AP =5. 又∵ 34tan =∠BAO ; ∴ 54sin =∠BAO . ∴ PQ =PA ·sin ∠BAO 4545=⨯=. …………………………………………………………………… 6分 (3)存在M 点的坐标分别为1M (0;0)、⎪⎭⎫ ⎝⎛724,02M 、⎪⎭⎫⎝⎛512,03M . ……………………… 8分。
2024年江西省抚州市九年级第二次质量检测数学模拟试题一、单项选择题(本大题共6小题,每小题3分,共18分)在每小题列出的四个备选项中只有一项是最符合题目要求的,请将其代码填涂在答题卡相应位置.错选、多选或未选均不得分.1. 2024的倒数是( )A .B .2024C .D .120242024-12024-2. 2023年10月26日11时14分,神舟十七号载人飞船成功发射,名航天员顺利进驻中国3空间站,与神舟十六号航天员乘组“太空会师”,入驻天宫.下列航天图标是中心对称图形的是()A .B.C .D .3. 如图,如果数轴上A 、B 两点分别对应实数a 、b ,那么下列结论正确的是()A. a +b >0B. ab >0C. a -b >0D. |a |-|b |>04. 直线经过一、三、四象限,那么点第( )象限.y kx b =+(),k b A. 一B. 二C. 三D. 四5. 照相机成像应用了一个重要原理,用公式表示,其中f 表示照相机镜()111v f f u v =+≠头的焦距,u 表示物体到镜头的距离,v 表示胶片(像)到镜头的距离.已知f ,v ,则u =()A .B. C. D. fv f v -f v fv -fv v f -v ffv -6.如图所示的运算程序中.若开始输入的x 值为15,则第1次输出的结果为18,第2次输出的结果为9,···,第2025次输出的结果为( )A .6B .3C .18D .9二、填空题(本大题共6小题,每小题3分,共18分)7. 因式分解=_______________________.2282x y -8. 2024龙年春节为期8天,号称“史上最长”春节假期,经文化和旅游部数据中心测算,春节全国国内旅游出游474000000人次.数据474000000用科学记数法表示.9. 一元一次不等式组的解集为 .214x x ->⎧⎨<⎩10.我国古代数学名著《张丘建算经》中有这样一题:一只公鸡值5钱,一只母鸡值3钱,3只小鸡值1钱,现花100钱买了100只鸡.若公鸡有8只,设母鸡有只,小鸡有只,可x y 列方程组为___________.动点(点F 不与点A ,D 重合).将△AEF 沿EF 所在直线翻折,点A 的对应点为A ′,连接A ′D ,A ′C .当△A ′DC 是等腰三角形时,AF 的长为.(第11题) (第12题)三、解答题(本大题共5小题,每小题6分,共30分)13.(1-tan60°;11|1|3-⎛⎫- ⎪⎝⎭(2)如图,已知四边形ABCD 为平行四边形,E ,F 为对角线BD 上的两点,且DF =BE ,连接AE ,CF .求证:∠DAE =∠BCF .14.先化简再求值:,其从,2,,3中选一个合适的数代2569222a a a a a ++⎛⎫+-÷ ⎪--⎝⎭a 2-3-入求值.15.如图,已知点A ,B ,C 均在⊙O 上,请用无刻度的直尺作图.(1)如图1,若点D 是AC 的中点,试画出∠B 的平分线;(2)如图2,若BD ∥AC ,试画出∠ABC 的平分线.图1 图216.魔术师刘谦在2024年央视春晚中表演的纸牌魔术让我们感受到魔术的神奇,他创造的“奇迹”给我们带来了很多快乐.很多对此感兴趣的学者很快就解开了扑克牌魔术背后的数学秘密.下面请你尝试用数学知识解答下面的问题:把一副普通扑克牌中的4张:黑桃2,红心3,梅花4,黑桃5,洗匀后正面朝下放在桌面上.(1)从中随机抽取一张牌是黑桃的概率是;(2)从中随机抽取一张,再从剩下的牌中随机抽取另一张.请用树状图表示抽取的两张牌牌面数字所有可能出现的结果,并求抽取的两张牌牌面数字之和大于7的概率.17. 从2024年开始抚州市体育中考新增了“三大球”选考项目,即足球运球、排球垫球、篮球运球.为了使学生得到更好的训练,某学校计划采购100个足球,x 个排球(x >50).现有A 、B 两家体育用品公司参与竞标,两家公司的标价都是足球每个50元,排球每个40元.他们的优惠政策是:A 公司足球和排球一律按标价8折优惠;B 公司规定每购买2个足球,赠送1个排球(单买排球按标价计算).(1)请用含x 的代数式分别表示出购买A 、B 公司体育用品的费用;(2)当购买A 、B 两个公司体育用品的费用相等时,求此时x 的值.4、解答题(本大题共3小题,每小题8分,共24分).19. 火灾是最常见、最多发的威胁公众安全和社会发展的主要灾害之一,消防车是消防救援的主要装备.图1是某种消防车云梯,图2是其侧面示意图,点,B ,在同一直线上,D O 可绕着点旋转,为云梯的液压杆,点,A ,在同一水平线上,其中可伸缩,DO O AB O C BD 套管的长度不变,在某种工作状态下测得液压杆,OB 3m AB =,.53BAC ∠=︒37DOC ∠=︒(1)求的长.BO (2)消防人员在云梯末端点高空作业时,将伸长到最大长度,云梯绕着点顺时D BD 6m DO O 针旋转一定的角度,消防人员发现铅直高度升高了,求云梯旋转了多少度.(参考数3m OD20.如图,在中,,以为直径作⊙O ,交线段于点,过点作ABD △AB AD =AB BD C C 于点.CF AD ⊥E(1)求证:是⊙O 的切线.CF(2)当,AC 的长.30D ∠=︒CE 五、解答题(本大题共2小题,每小题9分,共18分)21.安全无小事,教育部要求各中小学校在春季开学后进行安全教育,并观看“春季开学安全第一课”的视频.某校观看视频后开展了学生安全知识竞赛,现分别在两个年级中各随机抽取10名学生,统计这部分学生的竞赛成绩,并对数据进行收集、整理和分析(其中成绩大于等于80的视为优秀):【收集数据】七年级10名同学测试成绩统计如下:84,78,85,75,72,91,79,72,69,95八年级10名同学测试成绩统计如下:85,80,76,84,80,72,92,74,75,82【整理、分析数据】两组数据的平均数、中位数、众数、优秀率如表:22. 小天在复习时,遇到一个课本上的问题,温故后进行了操作、推理与拓展.请帮助小天解决“温故”、“推理”、“拓展”中的问题.(1)温故:如图1,在△ABC 中,于点,正方形的边在上,顶点、AD BC ⊥D PQMN QM BC P 分别在、上,若,,求正方形的边长;N AB AC 6BC =4=AD PQMN图1图1(2)操作:小天按数学家波利亚在《怎样解题》中的方法进行操作:如图2,任意画△ABC ,在上任取一点,画正方形,使,在边上,在△ABC 内,连接AB P 'P Q M N ''''Q 'M 'BC N '并延长交于点,画于点,交于点,于点,BN 'AC N NM BC ⊥M NP NM ⊥AB P PQ BC ⊥Q 得到四边形.小天把线段称为“波利亚线”;推理:证明图2中的四边形是PQMN BN PQMN 正方形;图3六、解答题(本大题共12分)轴有相同的交点,并且开口方向相同的抛物线所围成的封闭曲线称为【概念理解】(1)抛物线与抛物线y 1=2(x−1)(x−2)y 2【尝试应用】(2)抛物线与抛物线y 1=12(x−1)2−2y 2=ax 与轴有相同的交点,(点在点的左侧)x M N M N ①求的值.a:b:c答案一、单项选择题(本大题共6小题,每小题3分,共18分).A B C D C B2、填空题(本大题共6小题,每小题3分,共18分)7. 8. 9. ()()222x y x y +-81074.4⨯34x <<10. 11. 7.8 12. 或1或158310038100x y x y ⎧⨯++=⎪⎨⎪++=⎩222三、解答题(本大题共5小题,每小题6分,共30分)13. (1)解:(1-tan60°11|13-⎛⎫- ⎪⎝⎭3=-2; (3)(2)证明:∵四边形ABCD 是平行四边形,∴AD=BC ,AD ∥BC ,∴∠ADE=∠CBF ,∵在△ADE 和△CBF 中,∴△ADE ≌△CBF ,BCF..........................................................BCF. (6)14.解:原式()()()22252223a a a a a a +-⎡⎤-=-⋅⎢⎥--+⎣⎦()2245223a a a a ---=⋅-+()()()233223a a a a a +--=⋅-+, (4)3=3a a -+由题意可得,和,2a ≠3-当时,原式,3a =33033-==+当时,原式. (6)2a =-=5-15.解:(1)如图3,射线BE 即为所求;(2)如图4,射线BF 即为所求.图3 图4)17. 解:(1)购买A 公司体育用品的费用为:0.8(50×100+40x )=32x+4000; (1)购买B 公司体育用品的费用为:50×100+40×(x -)=40x +3000; (2100)2答:购买A 公司体育用品的费用为32x+4000;购买B 公司体育用品的费用为40x+3000; (3)(2)根据题意,32x +4000=40x +3000,解得,x =125, (5)答:当购买A 、B 两个公司体育用品的费用相等时,此时x 为125; (6)四、解答题(本大题共3小题,每小题8分,共24分)(2)解:如图,过点D 作DF 于点G ,过点D 作D G OC '⊥在中,Rt FOD △OD OB BD =+∴3sin37106m 5DF OD =⋅︒≈⨯=20.【详解】(1)证明:如图,连接,OC ∵,CF AD ⊥∴,90CED ∠=︒∵,AB AD =∴,B D ∠=∠∵,OB OC =∴,B OCB ∠=∠∴,D OCB ∠=∠∴,OC AD ∥∴,90OCE CED ∠=∠=︒∴,OC CF ⊥又∵为的半径,OC O ∴是的切线; (4)CF O (2)解:如图,连接,AC∵,,CF AD ⊥30D ∠=︒CE∴2CD CE ==∵为直径,AB ∴,AC BD ⊥又∵,AB AD =∴,,BC DC ==30B D ∠=∠=︒∴,260AOC B ∠=∠=︒∵在中,,Rt ABC △30B ∠=︒∴,2AB AC =设,则,AC x =2AB x =由勾股定理,得,即,222AB AC BC =+()(2222x x =+解得或(舍去),2x =2x =-∴,2AC =∴,4AB =∴,2OA =∴. (8)60221803AC l ππ︒⨯⨯==︒五、解答题(本大题共2小题,每小题9分,共18分)(2)可以推断出八年级年级学生知识竞赛成绩更好,理由为两班平均数相同,而八年级的中位数以及众数均高于七年级,说明八年级学生的竞赛成绩更好(答案不唯一); (6)(3)解:由题意得:(人),100040%120060%4007201120⨯+⨯=+=答:估计这两个年级竞赛成绩达到优秀学生的人数有人. (9)112022.【详解】(1)解:正方形的边在上,PQMN QM BC ,,,PN MN ∴=PN BC ∥MN BC ⊥,AD BC ⊥ ,,AD PN ∴⊥MN DE =,PN BC ∥ ,APN B ∴∠=∠又,PAN BAC ∠=∠ ,APN ABC ∴ ∽,PN AE BC AD ∴=,,6BC = 4=AD 4AE AD DE AD PN PN∴=-=-=-,464PN PN -∴=解得:,125PN =即正方形的边长为; (3)PQMN 125(2)证明:由题意可知,,90QMN PQM NPQ BM N ︒''∠=∠=∠=∠=四边形是矩形,,∴PQMN MN M N ''∥,,BN M BNM ''∴ ∽M N BN MN BN '''∴=同理可得:,BP N BPN '' ∽,P N BN PN BN '''∴=,M N P N MN PN ''''∴=,M N P N ''''=,MN PN ∴=矩形是正方形; (6)∴PQMN (3)解:,理由如下:90QEM ∠=︒由(2)可知,四边形是正方形,PQMN ,,90BMN ∴∠=︒NM MQ =,3tan 4NBM ∠= ,34MN BM ∴=设,,则,3MN k =4BM k =3NE NM QM k ===,,5BN k ∴==BQ BM QM k =-=,2BE BN NE k ∴=-=,,122BQ k BE k ∴==2142BE k BM k ==,BQ BE BE BM ∴=,QBE EBM ∠=∠ ,BQE BEM ∴△△∽,BEQ BME ∴∠=∠,NE NM = ,NEM NME ∴∠=∠,90BME EMN ∠+∠=︒ ,90BEQ NEM ∴∠+∠=︒ (9)90QEM ∴∠=︒六、解答题(本大题共12分)23.解:(1)抛物线与抛物线围成“月牙线”;理由如下:y 1=2(x−1)(x−2)y 2=x 2−3x +2在中,令得或,y 1=2(x−1)(x−2)y =0x =1x =2抛物线与轴的交点为和;∴y 1=2(x−1)(x−2)x (1,0)(2,0)在中,令得或,y 2=x 2−3x +2y =0x =1x =2抛物线与轴交点为和,∴y 2=x 2−3x +2x (1,0)(2,0)抛物线与抛物线与轴有相同的交点,∴y 1=2(x−1)(x−2)y 2=x 2−3x +2x 又抛物线与抛物线开口方向相同,y 1=2(x−1)(x−2)y 2=x 2−3x +2抛物线与抛物线围成“月牙线”; (3)∴y 1=2(x−1)(x−2)y 2=x 2−3x +2(2)①在中,令得或,y 1=12(x−1)2−2y =0x =3x =−1抛物线与轴交点为和,∴y 1=12(x−1)2−2x (3,0)(−1,0)把和代入得:(3,0)(−1,0)y 2=ax 2+bx +c ,{9a +3b +c =0a−b +c =0 解得,{b =−2a c =−3a ;∴a:b:c =a:(−2a):(−3a)=1:(−2):(−3)∴的值为; (7)a:b:c 1:(−2):(−3)②由①知,,y 2=ax 2−2ax−3a =a(x−1)2−4a 抛物线的顶点为,∴y 2=ax 2−2ax−3a (1,−4a)抛物线的顶点为,,∵y 1=12(x−1)2−2(1,−2)a >12,∴−4a <−2抛物线在抛物线上方;∴y 1=12(x−1)2−2y 2=ax 2−2ax−3a ,,∴m =12(x 0−1)2−2n =ax 20−2ax 0−3a ,∴m−n =12(x 0−1)2−2−(ax 20−2ax 0−3a)=(12−a)x 20+(2a−1)x 0+3a−32的值始终不大于2,∵m−n ,∴4×(12−a )⋅(3a−32)−(2a−1)24×(12−a )≤2整理得:,2a 2−3a +1≤0解得,12≤a ≤1,∵a >12;∴12<a ≤1在中,令得,y 1=12(x−1)2−2x =0y =−32,∴A (0,−32)在中,令得,y 2=ax 2−2ax−3a x =0y =−3a ;∴B(0,−3a),∴AB =−32−(−3a)=3a−32 ;∵12<a ≤1,∴0<3a−32≤32线段长的取值范围是.....................................................................................12∴AB 0<AB ≤32。
莆田第十五中学2024~2025学年上学期第二次月考检测卷九年级数学试卷一、选择题:本题共10小题,每小题4分,共40分.1. 下列方程中,是一元二次方程的是( )AB. C. D. 2. 下列图形中,是中心对称图形的是( )A.B.C.D.3. 下列各点,在二次函数的图象上的是( )A. B. C. D.4. 如图,将绕点C 顺时针旋转后得到,若,则的度数是( ).A. B. C. D. 5. 已知是半径为4的圆中的一条弦,则的长不可能是( )A. 8B. 5C. 4D. 106. 若反比例函数的图象经过第二、四象限,则的值可能是( )A. 7B. 5C. 3D. 17. 在Rt △ABC 中,∠C =90∘ ,AC =2,BC =1,则sin B 的值为( )A. 55B. 12C.2 55D. 28. 两名同学在一次用频率估计概率的试验中统计了某一结果出现的频率,绘制出统计图如图所示,则符合这一结果的试验可能是( )A. 抛一枚硬币,正面朝上的概率B. 掷一枚正六面体的骰子,出现点数是3的倍数的概率C. 将一副新的扑克牌(54张)洗匀后,随机抽一张,抽出牌上的数字为“3”的概率D. 从装有3个红球和1个蓝球(4个球除颜色外均相同)的不透明口袋中,任取一个球恰好是蓝球的概率9. 如图所示的是某家用晾衣架的侧面示意图,已知,根据图中数据,P ,Q 两点间的距离是( )A. B. C. D. 10. 已知点,,在抛物线(为常数且)上,则下列结论正确的是( )A. B. C. D. 二、填空题:本题共6小题,每小题4分,共24分.11._________。
12. 若关于x 一元二次方程有一个根为,则另一根为_________.13. 如图,小明同学用自制的直角三角形纸板测量树的高度,他调整自己的位置,设法使斜边保持水平,并且边与点B 在同一直线上,已知纸板的两条直角边,,测得边DF 离地面的高度,,则树高为_________14. 在一个不透明的口袋中有且仅有6个白球和14个红球,它们除颜色外其他完全相同,从口袋中随机摸出一个球,摸出红球的概率是_____________.15. 下面是小明同学采用因式分解法求解一元二次方程解题过程,等式左边去括号,得,①移项、合并同类项,得,②等式左边分解因式,得,③解得,.④.的2122x x+=2220x -=3x y +=310x -=222y x x =+-()1,1()2,3()0,2()1,5--ABC 65︒FEC 30ACB ∠=︒BCF ∠65︒30︒35︒25︒MN MN 2k y x-=k AB PQ ∥0.6m0.8m 0.9m 1m()10,A y ()21,B y ()35,C y 225y ax ax =--a 0a <231y y y >>132y y y >>321y y y >>213y y y >>230x x m ++=14x =-2x =DEF AB DF DE 35cm DE =20cm EF =1.3m AC =7m =CD AB m()()313x x --=2433x x -+=240x x -=()()140x x --=11x =24x =以上解题过程中,开始出现错误那一步对应的序号是_____________.16. 如图,以G(0,3)为圆心, 半径为6的圆与x轴交于A, B两点, 与y轴交于C, D两点, 点E为⊙G上一动点,CF⊥AE于F, 点E在⊙G的运动过程中,线段FG的长度的最小值为.三、解答题:本题共9小题,共86分.解答应写出文字说明、证明过程或演算步骤.17. 解方程:.18.19. 如图,在平面直角坐标系中,直线与双曲线相交于,B两点,轴,垂足为C.(1)求双曲线的解析式,并直接写出点B的坐标.(2)求的面积.20. 如图,是的直径,弦平分,,过点D作的切线交的延长线于点E,连接.(1)求证:直线是的切线.(2)求证:.21. 福建某公司经销一种红茶,每千克成本为40元.市场调查发现,在一段时间内,销售量(千克)随销售单价(元/千克)的变化而变化,其关系式为.设这段时间内,销售这种红茶总利润为(元).(1)求与的函数关系式.(2)求这段时间内,销售这种红茶可获得的最大总利润.22. 如图,在中,.(1)求作,使圆心O落边上,且经过A,B两点.(尺规作图,保留作图痕迹,不必写作法).(2)已知,求的半径.23. 为了解全校名同学对学校设置的体操、篮球、足球、跑步、舞蹈等课外活动项目的喜爱情况,在全校范围内随机抽取了若干名同学,对他们喜爱的项目(每人选一项)进行了问卷调查,将数据进行了统计,并绘制成了如图所示的条形统计图和扇形统计图(均不完整),请回答下列问题:(1)参加问卷调查的同学共_________名,补全条形统计图.(2)在篮球社团活动中,由于甲、乙、丙、丁四人平时的表现优秀.现决定从这四人中任选两名参加篮球大赛,用树状图或列表法求恰好选中丙、丁两位同学的概率.24. 如图1,线段上有一点,分别以,为直角边作等腰和等腰,.将绕点D顺时针旋转(如图2),连接,取的中点M,过点E作交射线于点N,与的交点为F.(1)求证:.(2)求证:.(3)求证:.25. 如图,抛物线与y轴交于点A,与轴交于点,,P是线段下方抛物线上的一个动点,过点Р作轴的垂线,交轴于点H,交于点D.设点P的横坐标为.(1)求抛物线的解析式.(2)用含t的式子表示线段的长,并求线段长度的最大值.(3)连接,当与相似时,求点P的坐标.的在2430x x+-=y x=kyx=()2,A m BC x⊥kyx=ABCCD OCB ACD∠AC AB⊥OCBBDAB OACB BDE∽△△p x3300p x=-+yy xABC30B C∠=∠=︒OBC O6BC=O2000BC()D CD BD>BD CD Rt ABDRt DCE90ABD DCE∠=∠=︒DCE△45︒AE AE EN AB∥BM BN ADAB EN=BC CN=2CB CF CA=⋅26y ax bx=+-x()3,0B-()1,0C ABx x AB()30t t-<<PD PDAP DPADHB△。
九年级第二次月考 (数学)试卷考试总分:115 分 考试时间: 120 分钟学校:__________ 班级:__________ 姓名:__________ 考号:__________一、 选择题 (本题共计 10 小题 ,每题 5 分 ,共计50分 )1. 若−(−2)表示一个数的相反数,则这个数是( )A.12B.−12C.2D.−22. 2021年5月15日7时18分,天问一号探测器成功着陆距离地球逾3亿千米的神秘火星,在火星上首次留下中国人的印迹,这是我国航天事业发展的又一具有里程碑意义的进展.将数据3亿用科学记数法表示为( )A.3×105B.3×106C.3×107D.3×1083. 某几何体由一些大小相同的小正方体组成,如图是它的俯视图和主视图,那么组成该几何体的小正方体的个数最少为( )A.4个B.5个C.6个D.7个4. 下列运算正确的是( )A.(a +3)2=a 2+9B.a 8÷a 2=a 4C.a 2+a 2=2a 2D.a 2⋅a 3=a 65. 如图,AB//CD ,∠B =85∘,∠E =27∘,则∠D 的度数为( )−(−2)12−122−22021515718333×1053×1063×1073×1084567(a +3)2+9a 2÷a 8a 24+a 2a 22a 2⋅a 2a 3a 6∘∘A.45∘B.48∘C.50∘D.58∘6. 若某一样本的方差为s 2=15[(5−7)2+(7−7)2+(8−7)2+(x −7)2+(y −7)2],样本容量为5,则下列说法:①当x =9时,y =6;②该样本的平均数为7;③x ,y 的平均数是7;④该样本的方差与x ,y 的值无关.其中不正确的是( )A.①②B.②④C.①③D.③④7. 关于x 的一元二次方程x 2+4x +c =0没有实数根,则c 应满足的条件是( )A.c ≤4B.c ≥4C.c <4D.c >48. 某工程队承接了80万平方米的荒山绿化任务,为了迎接汛期的到来,实际工作时每天的工作效率比原计划提高了20%,结果提前25天完成了这一任务.设实际工作时每天绿化的面积为x 万平方米,则下列方程中正确的是()A.80x −80(1+20%)x =25B.80(1+20%)x −80x =25C.80×(1+20%)x −80x =25D.80x −80×(1+20%)x =25 9. 心理学家发现:课堂上,学生对概念的接受能力s 与提出概念的时间t (单位:min )之间近似满足函数关系s =at 2+bt +c(a ≠0),s 值越大,表示接受能力越强.如图记录了学生学习某概念时t 与s 的45∘48∘50∘58∘=[s 215(5−7)2+(7−7)2+(8−7)2+(x−7)2+](y−7)25x =9y =67x y 7x y x +4x+c =0x 2cc ≤4c ≥4c <4c >48020%25x −=2580x 80(1+20%)x −=2580(1+20%)x 80x −=2580×(1+20%)x 80x −=2580x 80×(1+20%)xs t minA.8minB.13minC.20minD.25min10. 在△ABC 中,AB =AC ,若∠A =60∘,则△ABC 为( )A.钝角三角形B.直角三角形C.等边三角形D.等腰不等边三角形二、 填空题 (本题共计 5 小题 ,每题 5 分 ,共计25分 )11. 已知一次函数y =kx −b ,请你补充一个条件________,使y 随x 的增大而减小.12. 不等式组{2x <5,x −1<0的解集是________.13. 有不同的两把锁和三把钥匙,其中两把钥匙能分别打开这两把锁,第三把钥匙不能打开这两把锁.任意取出一把钥匙去开任意的一把锁,一次打开锁的概率是________.14. 如图,两个全等的直角三角形重叠在一起,将其中的一个三角形沿着点B 到点C 的方向平移到△DEF 的位置,AB =10,DO =4,平移距离为6,则阴影部分的面积为________.15. 如图,在直角坐标系中,直线y =−√3x +3分别与x 轴,y 轴交于M 、N ,点A 、B 分别在y 轴、x 轴上,且∠BAO =30∘, AO=2 .将△ABO 绕O 顺时针转动一周,当AB 与直线MN 垂直时,点A 坐标为________.8min13min20min25min △ABC AB =AC ∠A =60∘△ABC ()y =kx−b y x {2x <5,x−1<0B C △DEF AB =10,DO =46y =−x+33–√x y M N A B y x ∠BAO =30∘AO =2△ABO O AB MN A16. 计算:(1)(3√2)2−|−4|−(−13)−2+(−4−2)0;(2)(1−xx +3)÷x 2−9x 2+6x +9 . 17. 某年级共有300名学生.为了解该年级学生A ,B 两门课程的学习情况,从中随机抽取60名学生进行测试,获得了他们的成绩(百分制),并对数据(成绩)进行整理、描述和分析.下面给出了部分信息.a .A 课程成绩的频数分布直方图如下(数据分成6组:40≤x <50,50≤x <60,60≤x <70,70≤x <80,80≤x <90,90≤x ≤100)b .A 课程成绩在70≤x <80这一组的是:70 71 71 71 76 76 77 7878.5 78.5 79 79 79 79.5c .A ,B 两门课程成绩的平均数、中位数、众数如下:课程平均数中位数众数A 75.8m 84.5B 72.27083根据以上信息,回答下列问题:(1)直接写出表中m 的值________(2)在此次测试中,某学生的A 课程成绩为76分,B 课程成绩为71分,这名学生成绩排名更靠前的课程是________(填“A“或“B“),理由是________;(3)假设该年级学生都参加此次测试,估计A 课程成绩超过75.8分的人数. 18. 某数学兴趣小组想测量商丘电视台电视塔的高度,如图,该小组在商丘电视塔BC 前一座楼房楼顶A 处所观测到电视塔最高点B 的仰角为65∘,电视塔最低点C 的仰角为30∘,楼顶A 与电视塔的水平距离AD 为90米,求商丘电视塔BC 的高度.(结果精确到1米,参考数据√2≈1.41,√3≈1.73,sin65∘≈0.91,cos65∘≈0.42,tan65∘≈2.14)19. 如图,在平面直角坐标系中,已知矩形ABCD ,AB//y 轴,反比例函数y =kx (x >0)的图象过矩形的两个顶点A ,C .(1)若AB =4,A(1,6),①求反比例函数的解析式及点C 的坐标;②求证:点D 在直线OB 上;(1)−|−4|−+(3)2–√2(−)13−2(−4−2)0(2)(1−)÷x x+3−9x 2+6x+9x 2300A B 60a A 640≤x <5050≤x <6060≤x <7070≤x <8080≤x <9090≤x ≤100b A 70≤x <80707171717676777878.578.579797979.5c A B A 75.8m 84.5B 72.27083(1)m(2)A 76B 71A B(3)A 75.8BC A B 65∘C 30∘A AD 90BC 1≈1.412–√≈1.733–√sin ≈0.9165∘cos ≈0.4265∘tan ≈2.1465∘ABCD AB//y y =(x >0)k x A C(1)AB =4A(1,6)C D OB甲服装店租用2件和在乙服装店租用3件共需280元,在甲服装店租用4件和在乙服装店租用一件共需260元.(1)求两个服装店提供的单价分别是多少?(2)若该种服装提前一周订货则甲乙两个租售店都可以给予优惠,具体办法如下:甲服装店按原价的八折进行优惠;在乙服装店如果租用5件以上,且超出5件的部分可按原价的六折进行优惠;设需要租用x 件服装,选择甲店则需要y 1元,选择乙店则需要y 2元,请分别求出y 1,y 关于x 的函数关系式;(3)若租用的服装在5件以上,请问租用多少件时甲乙两店的租金相同? 21. 已知二次函数y =2(x −1)(x −m−3)(m 为常数).(1)求证:不论m 为何值,该函数的图象与x 轴总有公共点;(2)当m 取什么值时,该函数的图象与y 轴的交点在x 轴的上方? 22. 如图,在△ABC 中,AB =AC ,以AB 为直径的半圆分别交AC ,BC 边于点D ,E ,连接BD ,(1)求证:点E 是^BD 的中点;(2)当BC =12,且AD:CD =1:2时,求⊙O 的半径.23.【问题发现】(1)如图(1),在等腰直角三角形ABC 中,∠BAC =90∘,点M 为BC 边上异于B ,C 的一点,以AM 为边在其右侧作等腰直角三角形AMN ,∠MAN =90∘,连接CN.①CNBM =________;②CN 与BM 的位置关系是________.【深入探究】(2)如图(2),在△ABC 中,∠BAC =90∘,∠ABC =30∘,点M 为BC 边上异于B ,C 的一点,以AM 为边在其右侧作Rt △AMN ,使∠AMN =∠ABC ,∠MAN =∠BAC ,连接CN .(1)中的①②结论是否仍然成立?请说明理由.【拓展延伸】(3)如图(3),在正方形ADBC 中,点M 为BC 边上异于B ,C 的一点,以AM 为边在其右侧作正方形AMEF ,点N 为正方形AMEF 的中心,连接CN ,若BC =8,CN =2,请直接写出正方形AMEF 的面积.23280426055x y 1y 2y 1y x5y =2(x−1)(x−m−3)m (1)m x(2)m y x △ABC AB =AC AB AC BC D E BDE BDˆBC =12AD :CD =1:2⊙O(1)(1)ABC ∠BAC =90∘M BC B C AM AMN ∠MAN =90∘CN =CN BM CN BM(2)(2)△ABC ∠BAC =90∘∠ABC =30∘M BC B C AM Rt △AMN ∠AMN =∠ABC ∠MAN =∠BAC CN (1)(3)(3)ADBC M BC B C AM AMEFN AMEF CN BC =8,CN =2AMEF参考答案与试题解析九年级第二次月考 (数学)试卷一、选择题(本题共计 10 小题,每题 5 分,共计50分)1.【答案】D【考点】相反数【解析】此题暂无解析【解答】解:−(−2)=2,2为−2的相反数.故选D.2.【答案】D【考点】科学记数法--表示较大的数【解析】此题暂无解析【解答】此题暂无解答3.【答案】C【考点】由三视图判断几何体简单组合体的三视图【解析】易得这个几何体共有3层,由俯视图可得第一层正方体的个数,由主视图可得第二层和第三层正方体的可能的最少个数,相加即可.【解答】4.【答案】C【考点】同底数幂的乘法同底数幂的除法完全平方公式合并同类项【解析】此题暂无解析【解答】此题暂无解答5.【答案】D【考点】三角形的外角性质平行线的性质【解析】根据平行线的性质以及三角形的外角的性质解答即可.【解答】解:如图,因为AB//CD,所以∠1=∠B=85∘.因为∠E=27∘,所以∠D=85∘−27∘=55∘.故选D.6.【答案】D【考点】算术平均数【解析】先根据方差的定义及其计算公式得出:这组数据为5、7、8、α、y 且这组数据的平均数为7,继而知x +y =15,再逐一判断即可.【解答】解:s 2=15[(5−7)2+(7−7)2+(8−7)2+(x −7)2+(y −7)2]∴这组数据为5、7、8、x 、y ,且这组数据的平均数为7,∴5+7+8+x +y =35,∴x +y =15,①当x =9时,y =6,此说法正确;②这组数据的平均数为7,故此说法正确;③x 、y 的平均数为152=7.5,故此说法错误;④该样本的方差与x ,y 的值有关,故此说法错误;故选D .7.【答案】D【考点】根的判别式【解析】根据根的判别式即可求解.【解答】解:根据题意,可得:Δ=42−4c <0,解得:c >4.故选D.8.【答案】C【考点】由实际问题抽象为分式方程【解析】设实际工作时每天绿化的面积为x 万平方米,则原计划每天绿化的面积为x1+20%万平方米,根据工作时间=工作总量÷工作效率结合实际比原计划提前25天完成了这一任务,即可得出关于x 的分式方程,此题得解.【解答】解:设实际工作时每天绿化的面积为x 万平方米,则原计划每天绿化的面积为x1+20%万平方米,依题意,得:80x1+20%−80x =25,即80(1+20%)x −80x =25.故选C .9.B【考点】二次函数的应用二次函数的最值【解析】此题暂无解析【解答】解:由题意得:函数过点(0,43)、(20,55)、(30,31),把以上三点坐标代入s =at 2+bt +c(a ≠0)得:{43=c,55=202a +20b +c,31=302a +30b +c,,解得{a =−110,b =135,c =43;,则函数的表达式为:s =−110t 2+135t +43,∵a =−110<0,则函数有最大值,当t =−b2a =13时,s 有最大值,即学生接受能力最强.故选B .10.【答案】C 【考点】等边三角形的性质【解析】先根据△ABC 中,AB =AC 得出∠B =∠C ,再根据三角形内角和定理即可得出∠B 的度数,进而得出结论.【解答】解:在△ABC 中,AB =AC ,故△ABC 是等腰三角形,又∠A =60∘,所以△ABC 是等边三角形.故选C .二、 填空题 (本题共计 5 小题 ,每题 5 分 ,共计25分 )11.【答案】k <0【考点】一次函数的性质此题暂无解析【解答】解:根据一次函数的基本性质可知,在一次函数y=kx−b中,当k<0时,y随x的增大而减小.故答案为:k<0.12.【答案】x<1【考点】解一元一次不等式组【解析】分别解出两个不等式,再求不等式组的解集.【解答】解:由{2x<5①,x−1<0②,可得①x<52;②x<1.综合①②可得其解集为x<1.故答案为:x<1 .13.【答案】13【考点】概率公式列表法与树状图法【解析】画树状图(两把钥匙能分别打开这两把锁表示为A、a和B、b,第三把钥匙表示为c)展示所有6种等可能的结果数,找出任意取出一把钥匙去开任意的一把锁,一次打开锁的结果数,然后根据概率公式求解.【解答】解:画树状图为:(两把锁分别表示为A,B,对应的两把钥匙分别表示为a,b,第三把钥匙表示为c),共有6种等可能的结果数,其中任意取出一把钥匙去开任意的一把锁,∴任意取出一把钥匙去开任意的一把锁,一次打开锁的概率=26=13.故答案为:13.14.【答案】48求阴影部分的面积三角形的面积扇形面积的计算【解析】此题暂无解析【解答】解:由平移的性质知,BE=6,DE=AB=10,∴OE=DE−DO=10−4=6,∴S四边形ODFC=S梯形ABEO=12(AB+OE)⋅BE=12(10+6)×6=48,故答案为:48.15.【答案】(1,√3)或(−1,−√3).【考点】一次函数图象上点的坐标特点坐标与图形变化-旋转勾股定理含30度角的直角三角形【解析】计算出OM=√3,ON=3,即可确定∠NMO=60∘,然后利用AB与直线MN垂直画出图形,直线AB交y轴交于点C,作AD⊥x轴于D,则∠OCB=60∘,再解直角三角形求AD、OD,从而确定A点坐标.【解答】解:当x=0时,y=−√3x+3=3,则N(0,3),(√3,0),当y=0时,−√3x+3=0,解得x=√3,则M在Rt△OMN中,√ON2+OM2=2√3,由勾股定理得MN=∴∠NMO=60∘,在Rt△ABO中,∵∠BAO=30∘,AO=2,∴∠OBA=60∘,∴OB=2√33,∵AB与直线MN垂直,∴直线AB与x轴的夹角为30∘,如图1,直线AB交y轴于点C,交MN于G,作AD⊥x轴于D,GH⊥x轴于H,∴∠MGH=30∘,∴∠BGH=60∘∴∠OCB=60∘,∵∠OBA=60∘,∴△OBC是等边三角形,∴∠BOC=60∘,∴∠AOC=30∘,∴∠AOD=60∘,在Rt△OAD中,OD=12OA=1,AD=√3,∴A点坐标为(1,√3);如图2,直线AB交y轴于点C,作AD⊥x轴于D,同理:∠OCB=60∘,∵∠ABO=60∘,∴∠COB=60∘,∴∠AOC=30∘,∴∠AOD=60∘,在Rt△OAD中,OD=12OA=1,AD=√3,∴A点坐标为(−1,−√3).综上所述,A点坐标为(1,√3)或(−1,−√3).故答案为:(1,√3)或(−1,−√3).三、解答题(本题共计 8 小题,每题 5 分,共计40分)16.【答案】解:(1)原式=18−4−9+1=6.2−9x2+6x+9(2)原式=3x+3÷x2+6x+9x2−9=3x+3⋅x【考点】实数的运算分式的化简求值【解析】【解答】解:(1)原式=18−4−9+1=6.2−9x2+6x+9(2)原式=3x+3÷x2+6x+9x2−9=3x+3⋅x2(x+3)(x−3)=3x+3⋅(x+3)=3x−3 .17.【答案】78.75B,该学生的成绩小于A课程的中位数,而大于B课程的中位数(3)300×10+18+860=180(人)答:A课程成绩超过75.8分的人数约为180人.【考点】中位数频数(率)分布直方图用样本估计总体【解析】此题暂无解析【解答】解:(1)共60个数,中位数为从小到大排序后第30个数与第31个数的平均数,第30和31个数分别为78.5和79,所以中位数为78.75,即m=78.75.故答案为:78.75.(2) 76<78.75,71>70 ,该学生的成绩小于A课程的中位数,而大于B课程的中位数,故B课程名次更靠前.故答案为:B;该学生的成绩小于A课程的中位数,而大于B课程的中位数.(3)300×10+18+860=180(人)答:A课程成绩超过75.8分的人数约为180人.18.【答案】在Rt△ADB中,∵∠BAD=65∘,AD=90m,∘∴CD=AD⋅tan30∘=90×√33≈51.96(m).∴BC=BD+CD=192.6+51.96=244.56米.【考点】解直角三角形的应用-仰角俯角问题【解析】在Rt△ADB中,由锐角三角函数的定义可求出BD的长,同理在Rt△ADC中由锐角三角函数的定义可求出CD的长,进而解答即可.【解答】在Rt△ADB中,∵∠BAD=65∘,AD=90m,∴DB=AD⋅tan65∘≈90×2.14=192.6,同理,在Rt△ADC中,∵∠DAC=30∘,AD=90m,∴CD=AD⋅tan30∘=90×√33≈51.96(m).∴BC=BD+CD=192.6+51.96=244.56米.19.【答案】(1)①解:把点A(1,6)代入y=kx,得6=k1,解得k=6,∴反比例函数的解析式为y=6x.②证明:∵AB=4,A(1,6),∴点B的坐标为B(1,2),∴点C的纵坐标为2,将点C的纵坐标代入y=6x,得2=6x,解得x=3,∴点C的坐标为C(3,2),∴点D的坐标为D(3,6),设直线OB 的解析式为y=kx,将点B(1,2)代入y=kx,得2=k×1,解得k=2,∴直线OB的解析式为y=2x,当x=3时,y=2×3=6,∴点D在直线OB上.(2)证明:设点B的坐标为B(a,b),则点A的坐标为A(a,ka),点C的坐标为C(kb,b),∴AC的中点M的坐标为M(ab+k2b,ab+k2a).设直线OB的解析式为y=kx,则b=ak,解得k=ba,∴直线OB的解析式为y=ba x,当x=ab+k2b时,y=ba⋅ab+k2b=ab+k2a,∴直线OB经过AC的中点M.【考点】待定系数法求反比例函数解析式反比例函数与一次函数的综合【解析】左侧图片未提供解析.【解答】(1)①解:把点A(1,6)代入y=kx,得6=k1,解得k=6,∴反比例函数的解析式为y=6x.②证明:∵AB=4,A(1,6),∴点B的坐标为B(1,2),∴点C的纵坐标为2,将点C的纵坐标代入y=6x,得2=6x,解得x=3,∴点C的坐标为C(3,2),∴点D的坐标为D(3,6),设直线OB 的解析式为y=kx,将点B(1,2)代入y=kx,得2=k×1,解得k=2,∴直线OB的解析式为y=2x,当x=3时,y=2×3=6,∴点D在直线OB上.(2)证明:设点B的坐标为B(a,b),则点A的坐标为A(a,ka),点C的坐标为C(kb,b),∴AC的中点M的坐标为M(ab+k2b,ab+k2a).设直线OB的解析式为y=kx,则b=ak,解得k=ba,∴直线OB的解析式为y=ba x,当x=ab+k2b时,y=ba⋅ab+k2b=ab+k2a,∴直线OB经过AC的中点M.20.【答案】设甲店每件租金x元,乙店每件租金y元,由题可得:{2x+3y=2804x+y=260 ,解得{x=50y=60 ,答:两个服装店提供的单价分别是50元.60元;根据题意可得:y1=40x,y2={60x(0≤x≤5)36x+120(x>5)由40x=36x+120得x=30答:当x=30时,两店相同.【考点】一次函数的应用二元一次方程组的应用——行程问题(1)设甲店每件租金x元,乙店每件租金y元,根据甲服装店租用2件和在乙服装店租用3件共需280元,在甲服装店租用4件和在乙服装店租用一件共需260元,列出方程组解答即可;(2)根据题意列出函数解析式即可;(3)根据题意列出方程,进而解答即可.【解答】设甲店每件租金x元,乙店每件租金y元,由题可得:{2x+3y=2804x+y=260 ,解得{x=50y=60 ,答:两个服装店提供的单价分别是50元.60元;根据题意可得:y1=40x,y2={60x(0≤x≤5)36x+120(x>5)由40x=36x+120得x=30答:当x=30时,两店相同.21.【答案】(1)证明:当y=0时,2(x−1)(x−m−3)=0,解得:x1=1,x2=m+3.当m+3=1,即m=−2时,方程有两个相等的实数根;当m+3≠1,即m≠−2时,方程有两个不相等的实数根,∴不论m为何值,该函数的图象与x轴总有公共点.(2)解:当x=0时,y=2m+6,∴该函数的图象与y轴交点的纵坐标是2m+6,∴当2m+6>0,即m>−3时,该函数的图象与y轴的交点在x轴的上方.【考点】抛物线与x轴的交点二次函数图象上点的坐标特征【解析】此题暂无解析【解答】(1)证明:当y=0时,2(x−1)(x−m−3)=0,解得:x1=1,x2=m+3.当m+3=1,即m=−2时,方程有两个相等的实数根;当m+3≠1,即m≠−2时,方程有两个不相等的实数根,∴不论m为何值,该函数的图象与x轴总有公共点.(2)解:当x=0时,y=2m+6,∴该函数的图象与y轴交点的纵坐标是2m+6,∴当2m+6>0,即m>−3时,该函数的图象与y轴的交点在x轴的上方.22.【答案】(1)证明:连接AE ,DE∵AB 是直径,∴AE ⊥BC ,∵AB =AC ,∴BE =EC ,∵∠CDB =90∘,DE 是斜边BC 的中线,∴DE =EB ,∴^ED =^EB ,即点E 是^BD 的中点;(2)设AD =x ,则CD =2x ,∴AB =AC =3x ,∵AB 为直径,∴∠ADB =90∘,∴BD 2=(3x)2−x 2=8x 2,在Rt △CDB 中,(2x)2+8x 2=122,∴x =2√3,∴OA =32x =3√3,即⊙O 的半径是3√3.【考点】圆心角、弧、弦的关系等腰三角形的判定与性质【解析】(1)要证明点E 是^BD 的中点只要证明BE =DE 即可,根据题意可以求得BE =DE ;(2)根据题意可以求得AC 和AB 的长,从而可以求得⊙O 的半径.【解答】(1)证明:连接AE ,DE∵AB 是直径,∴AE ⊥BC ,∵AB =AC ,∴BE =EC ,∵∠CDB =90∘,DE 是斜边BC 的中线,∴DE =EB ,∴^ED =^EB ,即点E 是^BD 的中点;(2)设AD =x ,则CD =2x ,∴AB =AC =3x ,∵AB 为直径,∴∠ADB =90∘,∴BD 2=(3x)2−x 2=8x 2,在Rt △CDB 中,(2x)2+8x 2=122,∴x =2√3,∴OA =32x =3√3,即⊙O 的半径是3√3.23.【答案】1,CN ⊥BM (2)(3)如图,连接AB,AN.∵四边形ADBC,四边形AMEF均为正方形,点N为正方形AMEF的中心,∴∠ABC=∠BAC=45∘,∠MAN=45∘,∴∠BAC−∠MAC=∠MAN−∠MAC,即∠BAM=∠CAN.又∵ABAC=AMAN=√2,∴△ABM∼△ACN,∴CNBM=ACAB=cos45∘=√22,即2BM=√22,∴BM=2√2,∴CM=BC−BM=8−2√2,2=AC2+CM2=BC2+CM2∴S正方形AMEF=AM=82+(8−2√2)2=136−32√2.【考点】相似三角形的性质相似三角形的判定解直角三角形正方形的性质勾股定理等腰直角三角形全等三角形的判定全等三角形的性质【解析】此题暂无解析【解答】解:(1)△ABC,△AMN均为等腰直角三角形,∴AB=AC,AM=AN.又∵∠BAM=90∘−∠CAM,∠CAN=90∘−∠CAM,∴∠BAM=∠CAN,∴△ABM≅△ACN,∴CN=BM,∠ACN=∠ABM=45∘,∴CNBM=1,∠ACN+∠ACB=90∘,∴CN⊥BM.故答案为:1;CN⊥BM.(3)如图,连接AB,AN.∵四边形ADBC,四边形AMEF均为正方形,点N为正方形AMEF的中心,∴∠ABC=∠BAC=45∘,∠MAN=45∘,∴∠BAC−∠MAC=∠MAN−∠MAC,即∠BAM=∠CAN.又∵ABAC=AMAN=√2,∴△ABM∼△ACN,∴CNBM=ACAB=cos45∘=√22,即2BM=√22,∴BM=2√2,∴CM=BC−BM=8−2√2,2=AC2+CM2=BC2+CM2∴S正方形AMEF=AM=82+(8−2√2)2=136−32√2.。
永州市2022年高考第二次适应性考试试卷化学注意事项:1.本试卷共19道小题,满分为100分,考试时量75分钟。
2.考生务必将各题的答案填写在答题卡的相应位置,在本试卷上作答无效。
考试结束后只交答题卡。
3.可能用到的相对原子质量H-1 B-11 C-12 O-16 Na-23一、选择题:本题共10小题,每小题3分,共30分。
每小题只有一个选项符合题目要求。
1.化学创造美好生活。
以下说法错误的是A.用热的碳酸钠溶液去除餐具的油污B.芳香族化合物有香味,都可用作食品香味剂C.由CO2合成淀粉有利于实现碳达峰、碳中和的战略D.2022年北京冬奥会火炬的燃料是丙烷,属于清洁能源2.下列化学用语正确的是A.甲基的电子式:B.四氯化碳的比例模型:C.葡萄糖的实验式:C6H12O6 D.碳酸的电离方程式:H2CO32H++CO2-33.下列实验操作或装置能达到目的是A B C DA.浓硫酸的稀释B.配制一定物质的量浓度溶液的定容操作C.用AlCl3溶液制无水AlCl3固体D.验证乙炔使溴水褪色4.N A是阿伏加德罗常数的值。
下列说法正确的是A.100 g质量分数为46% C2H5OH溶液中所含O-H数目为7N AB.标准状况下,22.4 L CHCl3中含有氯原子的数目为3N AC.0.1 mol熔融的NaHSO4中含有的离子总数为N AD.50 mL 12 mol·L-1盐酸与足量MnO2共热,转移的电子数为N A5.福酚美克是一种能影响机体免疫功能的药物,结构简式如图。
下列说法错误的是A.一定条件下可发生缩聚反应B.1 mol福酚美克最多能与2 mol Na2CO3反应C.核磁共振氢谱的吸收峰数目有7个D.该物质能被酸性KMnO4溶液氧化6.下列实验的颜色变化,与氧化还原反应无关的是A.FeCl3溶液滴入Mg(OH)2浊液中,白色浑浊转化为红褐色沉淀B.AgNO3溶液滴入氯水中,产生白色沉淀,溶液淡黄绿色逐渐褪去C.银白色的钠块放在坩埚里加热,发出黄色火焰,生成淡黄色固体D.H2O2溶液滴入KMnO4酸性溶液中,产生气泡,溶液紫色逐渐褪去7.下列说法正确的是A.ΔH>0、ΔS>0的反应在低温下能自发进行B.0.2 mol·L-1氨水和0.2 mol·L-1 NH4HCO3溶液等体积混合:c(NH+4)+c(NH3·H2O)=c(H2CO3)+c(HCO-3)+c(CO2-3)C .25℃时,某盐溶液中由水电离出的c (H +)=1×10-a mol·L -1,则该溶液的pH 可能为a 或14-a D .0.1 mol AgCl 和0.1 mol AgI 混合后加入1 L 水中,所得溶液中c (Cl -)=c (I -) 8.335 ℃时,在恒容密闭反应器中C 10H 18(l)催化脱氢的反应过程如下:反应1:C 10H 18(l)C 10H 12(l)+3H 2(g) ΔH 1 反应2:C 10H 12(l)C 10H 8(l)+2H 2(g) ΔH 2测得C 10H 12和C 10H 8的产率x 1和x 2随时间的变化 关系如右图所示。
2024-2025学年宁夏石嘴山市第十五中学第二学期初三第二次模拟考试英语试题注意事项1.考试结束后,请将本试卷和答题卡一并交回.2.答题前,请务必将自己的姓名、准考证号用0.5毫米黑色墨水的签字笔填写在试卷及答题卡的规定位置.3.请认真核对监考员在答题卡上所粘贴的条形码上的姓名、准考证号与本人是否相符.4.作答选择题,必须用2B铅笔将答题卡上对应选项的方框涂满、涂黑;如需改动,请用橡皮擦干净后,再选涂其他答案.作答非选择题,必须用05毫米黑色墨水的签字笔在答题卡上的指定位置作答,在其他位置作答一律无效.5.如需作图,须用2B铅笔绘、写清楚,线条、符号等须加黑、加粗.Ⅰ. 单项选择1、––What’s on your desk, Judy?––It’s ________ English-Chinese dictionary. It’s _______useful dictionary.A.an, the B.an, an C.an, a2、I hear a new modern science lab ________ in our school next year.A.is built B.will build C.will be built D.builds3、-Buddy, you haven’t been acting like yourself. What’s up?-___________.A.I’m fine. Thanks B.Well done C.That’s good D.Never mind4、--Do you still play football?--Oh, no. I___ it for the past three years.A.haven't played B.didn't play C.won't play D.hadn't played5、Which pair of the words with the underlined letters has different sounds?A.correct concert B.alive pride C.absent, ancestor6、As the road to the airport is under repair, we will have to _______ early to get there in time.A.turn off B.take off C.put off D.set off7、My father usually plays ______ basketball to relax after a week’s hard work.A.a B.an C.the D./8、— Amy, why are you still in the classroom? School is over for half an hour.— Because I my task yet. I still need one more hour.A.didn’t finish B.won’t finish C.haven’t finished D.hadn’t finished9、Knowing something well is not easy. It may take years ___ you know everything of something.A.since B.after C.before D.until10、–Would you mind if I borrow your digital camera?--___________. Because I stored plenty of important pictures in it.A.Yes, I’d be glad to.B.Sorry, I’m afraid I can’t.C.No problem.D.Yes, of course.Ⅱ. 完形填空11、About ten years ago when I was a student at college, I spent my summer holidays 1 at a museum. Life was hard for me then. Dad had lost his job and Mum was sick in bed. I was 2 if I would be able to go on with my study the next term.One day while I was working, I saw an old man come in with a little girl 3 a wheelchair(轮椅). As I looked at this girl 4 , I found that she had no arms 5 legs. She was wearing a little white dress and she also had a hat on.As the old man pushed the wheelchair up to me, I was busy with my work, I 6 my head toward the girl and gave her a wink(眨眼). When I took the money from her grandfather, I looked back at the girl. She was giving me the prettiest, largest smile I have 7 seen. Suddenly her handicap(生理缺陷)was gone and all I saw was this beautiful girl, whose 8 almost gave me a better understanding of what life is all about. She 9 me into her world of smiles, love and warmth.I’m now a successful businessman and whenever I 10 and think about the trouble of the world, I think about that little girl and the unforgettable lesson about 1ife that she taught me.1.A.visiting B.working C.paining D.cleaning2.A.hoping B.guessing C.wondering D.checking3.A.in B.for C.at D.with4.A.carefully B.hardly C.carelessly D.happily5.A.so B.and C.then D.or6.A.held B.turned C.1ifted D.gave7.A.never B.almost C.ever D.even8.A.face B.smile C.1anguage D.breath9.A.brought B.bought C.taught D.thought10.A.get down B.get up C.get off D.get overⅢ. 语法填空12、When you finish high school or university, is learning done? The answer is “no”. In many countries, people continue learning all their lives.1.is lifelong(终身的) learning important? How can it help you?You go to school and learn. You study. You take tests.2.learning doesn’t only happen in school. Learning doesn’t3.when you graduate from high school or college. You are learning all the time. For example, learning can4.when you go to a museum. It can5.happen when you get a job. You learn when you6.sports or when you take a trip.7.is life! We never stop learning. Every day you can improve yourself by learning something8..Let’s look at o ne example of lifelong learning in Japan. In Japan, lifelong learning is very important. People in Japan like to trynew learning activities. Music, calligraphy(书法) and foreign languages are some of their9.classes.When we graduate from school, we should10.on learning. Make lifelong learning one of your goals!Ⅳ. 阅读理解A13、South Africa’s former president Mandela died of illness on December 5th,2013, and his funeral(葬礼) was held in his hometown on Dec. 15,2013.Born on July 18,1918 in a small village in South Africa, Mandela was one of the 13 children of a chief(酋长). Having finished his education, he joined the African National Congress(ANC) in 1943 and later formed the Youth League of the ANC.In 1948, when the National Party won the national election(选举), Mandela started to fight against the party’s apartheid policy(种族隔离政策). He was put into prison in August,1962 when he was 43 years old. While he was in prison, many people at home and abroad supported him, and the government had to give back his freedom(自由) on Feb. 11, 1990. It was in the next year that Mandela was chosen as the president of the ANC.He was awarded the Nobel Peace Prize in 1993. The next year, he was elected(选举) South Africa’s president. As a president, he worked hard to improve the people’s lives and won the people’s love. In 1999, he left office.As South Africa’s first black president after more than three centuries of the white rule, Mandela was thought as “father” of his country. His birthday, July 18,was made an annual(每年的) international Mandela Day by the UN in 2009 to honor his 67 years’ struggle(奋斗) for social justice and world freedom.1.Mandela had spent_______ years in prison.A.29 B.27 C.43 D.672.When did Mandela become South Africa’s president?A.In 1990. B.In 1993. C.In 1994. D.In 1999.3.The best title for the passage is_______.A.Mandela’s life in prisonB.The great life of MandelaC.Mandela’s life in his hometownD.Mandela and his familyB14、Everyone has got two personalities—the one that is shown to the w orld and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control your behavior, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their position. The important position is the one that you go to sleep in.If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashio n or new ideas. You don’t like to upset people, so you never express your real feelings. You’re quite shy and you aren’t very confident.If you sleep on your stomach, you are a rather secretive(不坦率的)person. You worry a lot and you’re always easily upset. You’re very stubborn(顽固的), but you aren’t very ambitious. You’re usually live for today not for tomorrow. This means that you enjoy having a good time.If you sleep curled up (卷曲),you are probably a very nervous person. You have a low opinion of yourself and so you’re often defensive. You’re shy and you don’t normally like meeting people. You prefer to be on your own. You’re easily hurt.If you sleep on your side, you have usually got a well-balanced personality. You know your strength s and weaknesses. You’re usually careful. You have a confident personali ty. You sometimes feel anxious, but you don’t often get depressed. You always say what you think even if it annoys people.1.According to the writer, you naturally show your secret and real personality .A.only in a normal nightB.only when you go to sleepC.only when you refuse to show yourself to the wordD.only when you change sleeping position2.Which is NOT mentioned in the second paragraph about a person’s personality?A.He or she is always open with others.B.He or she always likes new ideas earlier than others. 21*cnjy*comC.He or she is always easily upset.D.He or she tends to believe in others.3.Point out which sentence is used to show the personality of a person who is used to sleeping on his or her stomach? A.He or she is careful not to offend others.B.He or she doesn’t want to stick to his or her opinion.C.He or she can’t be successful in any business.D.He or she likes to bring others happiness.4.Which of the following may be the reason for you not to make friends with a person whosleeps curled up?A.He or she would rather be alone than communicate with you.B.He or she is rarely ready to help you.C.He or she prefers staying at home to going out.D.He or she wouldn’t like to get help from you.5.It appears that the writer tends to think highly of the person who sleeps on oneside because .A.he or she always shows sympathy for peopleB.he or she is confident, but not stubbornC.he or she has more strengths than weaknessesD.he or she often considers annoying peopleC15、Space vegetables are grown from seeds(种子)that have been taken to space and brought back to the earth. The seeds are affected by the radiation(辐射)and low gravity in space. When they are brought back to the earth, these seeds produce vegetables that are bigger and healthier than normal vegetables. However, some people worry about eating space vegetables. They think that space vegetables might not be good for us and could make us get sick because of the radiation in space. However, people should not be frightened because space vegetables are very healthy.Here are some facts that you should know about space vegetables.Space vegetables are grown from seeds that are carefully chosen. When seeds are brought back from space, they are tested to make sure that they will be safe to eat.Space vegetables are better for you than normal vegetables. For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes.After genetically modified(转基因)food appeared in the market, people worried that they were eating unknown things. For example, if nut genes(坚果基因)are put inside potatoes, peopleallergicto nuts might get sick from eating these potatoes because they do not know they are also eating nuts. Unlike genetically modified food, space vegetables have not been geneticallychanged. This means that no new genes are put into the vegetables. Therefore, there are no dangers of eating something unknown.1.Genetically modified food is different from space vegetables because it .A.is grown in spaceB.has nothing unknownC.has been genetically changedD.has no new genes2.According to the passage, normal tomatoes can stay fresh for about days.A.seven B.thirteenC.twenty D.twenty-seven3.The underlined word "allergic" means“”in Chinese.A.过敏B.种植C.发现D.出售4.The writer wants to tell us that .A.space vegetables are grown in spaceB.everybody worries about eating space vegetablesC.space vegetables are safe and good for people to eatD.space vegetables may bring illness to us because of the radiation in spaceD16、Sarah ran in, shouting, “Look what I found!” Over the top of the paper I was reading; came a terrible thing that caused me to jump. It was a snake skin found in our garden.“Isn’t it beautiful?” said my seven-year-old daughter.I opened my eyes widely and looked at the snake skin in fear(恐惧地). I didn’t think it was beautiful, but I learned never to appear nonchalant(冷漠的)with children. Everything they see for the first time is important to their sense of beauty; they see only excellence in the world.“Why does it do this?” Sarah asked.“Snakes shed(蜕) their skins because they need to renew themselves,” I explained.“Why do they need to renew(使更新)themselves?” Sarah asked.“We often need to shed our skins, those coatings that we cover ourselves with,” I said to my daughter. “We leave some things and find other thing unwanted or unnecessary. This snake no longer needs this skin. It is probably too little for him, and he probably doesn’t think he looks as smart in it as he once did. ”As we talked, I knew that she began to understand. Although she couldn’t understand clearly, she would know that renewal is part of progress; that we need to take a good look at ourselves, our rooms, schoolwork and spirit, and see what we need to keep and what we need to leave. I was careful to tell that this is a natural way, not one to be forced.“Snakes don’t peel off their skins when they like them. “I explained. “It happens as a natural thing of their growth. ”“I see, Dad,” said Sarah as she held t he snake skin, and then ran off.I hoped she would remember this; we need to throw some away because they are worthless or unnecessary. Then we can store them as memories in our deep hearts.1.Father jumped up when her daughter came to him with a snake skin because ______.A.he didn’t want to read any moreB.he was in great fear of itC.he wanted to praised her daughterD.he hated snakes2.Father’s patient explanation shows that ______.A.his daughter didn’t want to listen to him at allB.he knew children saw only excellence in the worldC.his daughter couldn’t follow him at allD.he wanted to teach everything to her3.We learn from the reading that______.A.the girl seemed to understand what her father saidB.the girl wasn’t interested in the explanationC.the father was good at raising snakesD.the father liked the snake skin betterE17、①The Dream It is everyone's dream to work at home or not work at all.You can plan your own hours and work when you want to.There is no more rush hour and no hours that people waste when the yget to and from a job every day.②The Fact The fact is that this dream can be attained.You can stay at home,work when you want to and make money when you need to.There are plenty of opportunities for you make moneyat home,just by using your computer and the Internet.③Start Today! Educate yourself,look closely in toall the opportunities and decide on what works best for you.It will not happen during one night,but you can make the decision to day and start to make it happen today.④How Could You Do It?Do you have a blog(博客)or a personal website like millions of other people?Are you using it to make money Most of these blog and website owners are not.But you can do that!⑤When you have your computer and the Internet working for you,your businesses will be working for you 24 hours a day,seven day a week.You will make money while you sleep,travel or do whatever you want to do all day long.⑥Get Going!There are many ways you can make money with your computer.And you can begin your Stay-at-home businesses with just a little money.What are you waiting for?1.In which part of a newspaper would you most probably read this passage?______A.Sports B.News C.Culture D.Business2.What does the underlined word"attained"inPoint②mean?______A.Broken B.Realized C.Lost D.Destroyed3.What's the best title for Point⑤?______A.Sleep24 Hours a Day B.Make Money Every MomentC.Play All Day Long D.Travel Around the World4.Which of the following is NOT TRUE according to the passage?______A.People need a lot of money to start a stay-at-home business.B.People can even use their blogs to make money.C.People can plan their own time when they work at home.D.People can make the best decision and start to make it happen today.5.How is the passage organized?______A.By using famous people's words.B.By giving reasonsonly.C.By showing a topic and giving solutions.D.By telling old stories.F18、What will you do when you are l 97 Study in high school? So will Britney Spears.But she is also a super star in the world of pop music sweet and lovely,Britney quickly captured(赢得)many people’s hearts! Here is something about her.1.In the past two years her _______ has changed greatly.A.1ife B.boyfriendC.study D.family2._______ made her become an outstanding person.A.The hot danceB.The sweetest faceC.The most attractive bodyD.The appearance of her Jive recor d “Baby One More Time”3.Now she has been __________.A.a queenB.lived everyday wellC.a famous athleteD.a super star and the Queen of Teen4.Her favorite movie is __________.A.Mother B.BridgeC.Titanic D.Brad Pitt5.Which of the following isn’t h er favorite? A.Pepsi.B.Red roses.C.Baby blue.D.Basketball.Ⅴ.书面表达19、暑假即将来临,许多学生喜欢下河游泳。
山西省2022年信息技术学业水平测试真题(九)9.15一、单项选择题。
(每小题2分,15小题,共30分)1.信息系统广泛应用于人们的生产和生活中,下列关于信息系统应用的说法,错误的是()。
A. 由于人们经济条件、教育程度的不同,信息系统的使用率会受到影响B. 信息系统对外部环境的依赖决定了信息系统具有较大的局限性C. 用户误操作、软件故障、病毒感染等都可能给信息系统带来灾难性损失D. 在设计合理、实施恰当的情况下,信息系统不存在局限性【正确答案】:D2.信息社会也称信息化社会,是脱离工业化社会以后,信息将起主要作用的社会。
下列关于信息社会的说法,不正确的是()。
A. 信息社会是一个立足于可持续发展的新型社会B. 信息社会的发展必须以经济建设为中心C. 信息社会是一个具有包容性和全面发展的社会D. 信息社会以信息和知识作为重要资源信息社会以信息和知识作为重要资源【正确答案】:B3.无线射频识别技术(RFID)是一种非接触的自动识别技术。
以下场景中没有应用到该技术的是()。
A. 高速公路电子不停车收费(ETC)B. 手机预约挂号C. 扫描衣服上的电子标签D. 乘坐高铁时刷身份证进站【正确答案】:B4.小王在某餐厅参加同学聚餐,结果发现手机账户信息被盗,最大可能的原因是()。
A. 连接了不安全的WiFi信号B. 在餐厅里用APP播放视频C. 采用了二维码付款D. 添加了朋友的微信D:添加了朋友的微信【正确答案】:A5.计算机的软件系统分为系统软件和应用软件两大类。
下列软件属于应用软件的是()。
A. 数据库管理系统B. Linux操作系统C. WPS Office软件D. Windows操作系统【正确答案】:C6.手机已经成为人们生活的重要组成部分,在购买手机时,首先应考虑的是其性能指标,下列关于手机性能指标的说法,正确的是()。
A. 手机屏幕的大小、分辨率的高低直接关系到显示的效果B. 搭载双核CPU的手机一定比搭载四核CPU的手机性能差C. 手机的运行内存指运行时暂时存储数据的存储器,决定着手机的存储容量D. 手机的机身内存是用来存储数据的存储器,决定着手机的运行快慢【正确答案】:A7.高德地图具有基于交通大数据的躲避拥堵功能,能够实时推荐最快路线,主要体现的大数据特征是()。
福建省建瓯二中 九年级下学期第二次月考数学试题 新人教版(满分:150分;考试时间:120分钟)★友情提示:① 所有答案都必须填在答题卡相应的位置上,答在本试卷上一律无效;② 可以携带使用科学计算器,并注意运用计算器进行估算和探究; ③ 未注明精确度、保留有效数字等的计算问题不得采取近似计算.一、选择题(本大题共10小题,每小题4分,共40分.每小题只有一个正确的选项,请在答题卡...的相应位置填涂) 1.-3的倒数是 A .3B .-3C .31 D .31-2.第六次全国人口普查登记的全国总人口约为十三亿四千万人 (1 339 724 852人),将数据十三亿四千万用科学记数法表示为 A .1010134.0⨯ B .111.3410⨯C .91034.1⨯D .91.3310⨯ 3.如图是一个几何体的三视图,则这个几何体是A .圆柱B .圆锥C .三棱锥D .长方体4.下列事件为必然事件....的是 A .太阳从东边升起 B .任意买一张电影票,座位号是偶数 C .明天不会下雨 D .经过某一有交通信号灯的路口,恰好遇到红灯5.下列计算正确..的是 A. a a a =-23 B. a a a =÷43C. 44a a a =⋅D .6332)(b a ab =6.设一辆汽车从南平到武夷山所需的时间为t ,平均速度为v ,则下面刻画v 与t 的函数关系的大致图象是7.在一次共有15人参加的“我唱红歌”歌咏比赛中,参赛选手要想知道自己能否进入 前8名,只需要了解自己的成绩及全部成绩的(第3题图)左视图俯视图vtOv tO vtO vtOA .B .C .D .A .中位数B .众数C .平均数D .极差8.某品牌不同种类的文具均按相同折数打折销售,如果原价300元的文具,打折后售价为240元,那么原价75元的文具,打折后售价为 A .65元B .60元C .55元D .50元9.已知⊙O 的周长为π6,若圆心O 到直线l 的距离为3,则直线l 与⊙O 的位置关系是A .相交B .相切C .相离D .无法确定10.如图,由4个小正方形组成的田字格,△ABC 的顶点都是小正方形的顶点,在田字格上能画出与△ABC 成轴对称,且顶点都在小正方形顶点上的三角形的个数共有 A .2个 B .3个C .4个D .5个二、填空题(本大题共8小题,每小题3分,共24分.请将答案填入答题卡...的相应位置) 11.计算:327-= . 12.分解因式:822-x = .13.若关于x 的方程m x x +-22=0有两个不相等.....的实数根, 则m 满足 .14.如图,将一副三角尺叠放在一起,则图中∠α的度数为 °.15.老师对甲、乙两位同学的五次数学测验成绩进行统计,得出两人五次测验成绩的平均分均为90分,方差分别是125122==乙甲,s s ,则成绩较稳定...的是 . (填“甲”或“乙”)16.一个布袋中装有3个红球和2个白球,每个球除颜色外均相同,从袋中任意摸出一个球,则摸到的球是红球的概率为 .17.已知等腰梯形ABCD 中,AD BC ∥,47B AD BC ∠===°,,10, AB =5,则梯形ABCD 的高等于 .18.如图,反比例函数xy 4=上有两点B 、E ,若四边形OABC 、ADEF 是正方形,则点E 的坐标是 .45 ︒60︒α(第14题图)(第10题图)Cy O xBCE A D FA三、解答题(本大题共8小题,共86分.请在答题卡...的相应位置作答) 19.(1)(7分)计算:2720122321203⨯+--÷-)(.(2)(7分)化简:)(-)(122122++a a .20.(8分)解分式方程:1132+=x x . 21.(8分)如图,在△ABC 中,AB =8,AC =6,点E 在AB 上,且AE =5.请在边AC 上确定一点F ,使△AEF 与△ABC 相似,并求出此时AF 的长.22.(10分)某校九年级共有400名学生,学校团委随机调查了部分学生对“低碳环保”知识的了解程度,并用收集到的数据绘制出如下两幅不完整的统计图.请根据上述统计图提供的信息,完成下列问题: (1)分别补全上述统计图1、图2;(2)请估计该校九年级约有多少学生比较了解....低碳环保知识? 23.(10分)某文具店计划用不低于1 500元且不高于1 600元的资金订购甲、乙两款书包共30个.已知甲款书包每个进价70元,乙款书包每个进价40元. (1)该文具店订购这两款书包,共有几种进货方案?人数 15 3018.75%% %(第22题图) ECBA(第21题图)(2)若该文具店以甲款书包每个100元,乙款书包每个60元的价格全部卖出,哪种方案获利最大?最大获利是多少元?24.(10分)如图,AB 经过圆心O ,交⊙O 于点B 、C .AD为⊙O 的切线,切点为D .已知∠B =32°,BC =8. (1)求∠A 的度数;(2)求AD 和BD 的长.(结果精确到0.1)25.(12分)如图,抛物线n mx x y +-=231与y A (-2,0)和点B (点B 在点A 的右侧).(1)求抛物线的解析式及点B 的坐标; (2)若点P 、Q 分别从B 、C 两点同时出发,均以每秒1个长度单位的速度沿BA 、CO 方向运动,当P 运动到A 时P 、Q 两点同时停止运动.在运动过程中,设运动的时间为t (秒),△APQ 的面积为S ,求S 与t 之间的函数关系式,并写出自变量t 的取值范围.[提示:抛物线c bx ax y ++=2(a ≠0)的对称轴是,a bx 2-=顶点坐标是⎪⎪⎭⎫ ⎝⎛--a b ac ab 4422,]26.(14分)如图,已知正方形ABCD 中,点E 、F 分别为AB 、BC 的中点,点M 在线段BF 上(不与点B 重合),连接EM ,将线段EM 绕点M 顺时针旋转90°得MN ,连接FN . (1)特别地,当点M 为线段BF 的中点时,通过观察、测量、推理等,猜想:∠NFC = °,=BMNF; (2)一般地,当M 为线段BF 上任一点(不与点B 重合)时,(1)中的猜想是否仍然成立?请说明理由;(第24题图)ACOB yx(第25题图)ADENG(3)进一步探究:延长FN 交CD 于点G ,求FMNG的值. 第二次月考参考答案一、选择题(本大题共10小题,每小题4分,共40分)1.D ; 2.C ; 3.B ; 4.A ; 5.D ; 6.C ; 7.A ; 8.B ; 9.B ; 10.C . 二、填空题(本大题共8小题,每小题3分,共24分) 11.-3; 12.2(x +2)(x -2); 13.1<m ; 14.75; 15.乙;16.53(或0.6); 17.4;18.(1+5,-1+5).三、解答题(本大题共8小题,共86分)21.解:过点E 作EF ∥BC 交AC 于点F ,………2分则△AEF ∽△ABC ………4分∴ACAFAB AE =………6分 ∴865⨯=⋅=AB AC AE AF =415.………8分 22.解:(1)图1补全2分;图2补全(每空2分)…………6分人数15303518.75%43.75%37.5%(2)400×37.5%=150∴该校九年级约有150名学生比较了解....低碳环保知识…………10分24.解:(1)连接OD ,∵AD 为⊙O 的切线, ∴∠ADO =90°…………1分又∵OB = OD ,∠B =32°∴∠ODB =∠B =32°…………2分 ∴∠DOA =64°…………3分∴∠A =90°-64°=26°…………4分 (2)∵BC =8,∴OD =4在Rt △ADO 中,A ODAD tan =…………6分 ︒=26tan 4≈8.2…………7分 连接CD ,∵CB 是圆O 的直径,∴∠CDB =90° 在Rt △CDB 中,B BC BD cos ⋅=…………9分︒=32cos 8≈6.8…………10分25. 解:(1)依题意,得⎪⎩⎪⎨⎧=++-=02344n m n 解得434-==n m ,…………2分∴抛物线的解析式为434312--=x x y …3分 由434312--x x =0,解得62=-=x x 或 ∵点B 在点A 的右侧, ∴B (6,0) ………5分(2)① 当0≤t <4时(如图1),OQ AP S ⋅=21…………6分 ()t t --=4)(821…………7分 166212+-=t t …………8分 ② 当4<t <8时(如图2),OQ AP S ⋅=21…………9分 ()4)(821--=t t …………10分 166212-+-=t t …………11分③ 当t =4时,点A 、P 、Q 三点共线,不构成 三角形;当t =8时,点A 、P 重合,点A 、P 、Q 不构成三角形. ……………12分综上,S 与t 之间的函数关系式为⎪⎪⎩⎪⎪⎨⎧<<-+-<≤+-=.8416621401662122)(),(t t t t t t S26. 解:(1)45°,2;(每空2分)…………4分 (2)答:仍然成立…………5分理由一:过点N 作NP ⊥BC 于P ,∴∠B =∠MPN =90°∵∠BME +∠BEM =90°,∠BME +∠NMP =90° ∴∠BEM =∠NMP又∵EM =MN ,∴△EBM ≌△MP N …………7分 ∴BM =PN ,EB =MP 又∵BF =EB ,∴BF =MP ∴B M =FP∴PN =FP …………8分 ∴∠NFP =45°…………9分NF =2FP =2BM ,即2=BMNF …………10分理由二:在EB 上取一点P ,使得BP =BM ,连接PM ,∵∠BME +∠BEM =90°,∠BME +∠NMF =90°, ∴∠BEM =∠NMF 又∵EM =MN ,EP =MF , ∴△EPM ≌△MFN …………7分 ∴∠MFN =∠EPM∵BP =BM ,∴∠BPM =45°…………8分 ∴∠NFC =∠BPM =45°…………9分NF =PM =2BM ,即2=BMNF …………10分(3)由(2)得∠NFC =45°,∴△FCG 是等腰直角三角形∴FC =GC ,FG 2FC 2BF …………12分 又由(2)得NF 2,∴NG = FG -NF 2BF 2BM 2MF 即2=FMNG …………14分(理由一)ABCDEMF NGP ABCDEMF NGP (理由二)。
大渡口区2023—2034学年度九年级第二次适应性检测英语试题(全卷共九个大题,满分150 分,考试时间120 分钟)注意事项:1.试题的答案书写在答题卡上,不得在试题卷上直接作答。
2.作答前认真阅读答题卡上的注意事项。
3.考试结束,由监考人员将试题卷和答题卡一并收回。
第Ⅰ卷(共95 分)I. 听力测试。
(共30 分)第一节(每小题 1.5 分,共9 分)听一遍。
根据你所听到的句子,从A、B、C 三个选项中选出最恰当的答语,并把答题卡上对应题目的答案标号涂黑。
1. A. I'm fine. B. You're welcome. C. Good afternoon.2. A. Yes,I am. B. Yes, please. C. No, it isn't.3. A. It's sunny. B. It's Monday. C. It's interesting.4. A. Have a good time. B. Well done. C. What a pity!5. A. See you. B. It's delicious. C. Sounds good.6. A. Here you are. B. OK,I will. C. Let's go.第二节(每小题 1.5 分,共9 分)听一遍。
根据你所听到的对话和问题,从A、B、C 三个选项中选出正确答案,并把答题卡上对应题目的答案标号涂黑。
7. A. On foot. B. By bike. C. By bus.8. A. Her friend. B. Her uncle. C. Her cousin.9. A. Mary. B. Mike. C. Sandy.10. A. At8:00. B. At 8:15. C. At 8:30.11. A. At a supermarket. B. At a hotel. C. At a cinema.12. A. Pink. B. Blue. C. Yellow.第三节(每小题 1.5 分,共 6 分)听两遍。
一、写出下列短语(每题4分)
1、完成看一本书
2、做报告
3、首先
4、一个字地一个字
5、超过
6、每天
7、爱上
8、查找它们
9、在字典里
10、明白意思
二、翻译句子(每题4分)
1、我不得不完成看一本书。
2、那听起来太难了。
3、慢慢来。
4、你看得越多,你就越快。
5、我怕问问题。
6、我爱上了英语。
7、小菜一碟。
8、你活该!
9、我想弄明白故事。
10、我能对英语电影有一个更好的理解。
三、圈出正确答案。
(每题4分)
1、I that sometimes!
A. do ;
B. did
2、Just read to get the main ideas .
A . quickly ; B. quick
3、You probably understand than you think.
A. better;
B. well
4、That sounds .
A . difficult ; B. difficulty
5、You can become by something you enjoy .
A . better, reading; B. best, read
6、The you do, the you’ll be .
A. more, better;
B. much, best
7、I in a dictionary .
A. looked it up ;
B. looked up it
8、How do you practice ?
A. speak ing;
B. speak
9、How do you improve your ?
A. writing;
B. writed
10、It’s too hard to understand English .
A. spoken ;
B. speaking。