河北省石家庄市第二十三中学(同文中学)2020-2021学年九年级上学期11月份英语月考
河北石家庄市第二十三中学2024-2025学年九年级10月阶段性学业水平检测道德与法治试题(含答案)
2024-2025学年第一学期学业水平检测一九年级道德与法治部编版(试卷页数:4页,考试时间:60分钟,总分:60分)一、选择题(本大题共12个小题,1~10小题每题2分,11、12小题每题3分,共26分。
在每小题给出的四个选项中,只有一项是最符合题目要求的)1.下面图片中的数据发生变化的原因有()①改革开放的实施②中国共产党的正确领导③城乡协调的实现④新时代主要矛盾的解决A.①②B.①④C.②③D.③④2.2024年7月,世界贸易组织在瑞士日内瓦举行第九次对中国贸易政策审议会议,与会世贸组织成员代表对中国表达了普遍赞赏:“中国是全球经济复苏最主要的推动力量”“中国是众多成员的最重要贸易伙伴”,这些赞赏共同说明了()A.中国人民通过改革开放过上了幸福生活B.改革开放激发了广大人民群众的创造性C.改革开放推动中国特色社会主义进入新时代D.中国成为世界经济增长的主要稳定器和动力源3.2024年6月,京津冀能源协同专题工作组正式成立。
三省市联合印发实施京津冀能源协同发展行动计划,全面布局京津冀区域能源发展的重点任务、重大项目和改革举措,整体谋划区域能源发展新格局。
这些举措将有利于()①促进区域的协调发展②消除城乡发展差距③推动经济高质量发展④丰富人民文化生活A.①③B.①④C.②③D.②④4.在2024年6月进行的上海老博会上,外骨骼机器人、老年人智能手机、智能可穿戴设备、防跌倒监测系统、个人健康管理系统等面向个人的科技产品不断涌现,帮助老年人更好地体验智慧生活。
用这段材料最能论证的观点是()①创新仅存在于科技领域②创新让生活更美好③应对国际竞争需要创新④生活因创新更舒适A.①②B.①③C.②④D.③④2024年6月24日,全国科技大会、国家科学技术奖励大会在人民大会堂隆重召开。
习近平向获得2023年度国家最高科学技术奖的李德仁院士和薛其坤院士颁发奖章、证书。
回答5-6题。
5.召开这样的大会有利于()①激发科技人才创新的积极性②为教育的发展奠定物质基础③强化人才的创新主体地位④营造有利于创新的舆论氛围A.①③B.①④C.②③D.②④6.大会的召开证明我国在落实()①科教兴国战略②城乡融合发展③人才强国战略④健康中国战略A.①③B.①④C.②③D.②④7.下表空格处应该填入的内容是()时政信息体现的全过程人民民主的特点今天的中国,构建起覆盖960多万平方公里土地、14亿多人民、56个①民族的民主体系,实现了最广大人民的广泛持续参与。
河北省石家庄市长安区第二十三中学(同文中学)2020-2021学年八年级上学期第二次英语月考试题
河北省石家庄市长安区第二十三中学(同文中学)2020-2021学年八上英语第二次月考(满分100 分)I 单项选择(每题2 分,共30分)1. The Eight Hundred is such ____ educational movie that many people felt ____ after watching it.A. a, excitingB. an, excitedC. the, excitingD. /, excited2. Studies shoe that good habits play a key role ----------- children’s education.A. inB. atC. toD. for3. Although the boy was only five years old, he ____ play golf well.A. be able toB. was able toC. is able toD. will be able to4.--- Mom, ____ will you buy me a new bike? ----Oh, maybe in a few months.A. How oftenB. How longC. How soonD. How far5.--- What are you going to do this Sunday?--- I’m not ____ it because my uncle may come to see me.A. similar toB. famous forC. busy withD. sure about6. ---What thick clouds! --- Yes! The radio says there ____ a heavy rain this afternoon.A. isB. wasC. will beD. is going to have7. Sam made a ____ to his teacher that he could study hard.A. discussionB. decisionC. planD. promise8. We still have ____ to make the birthday cake look ____.A. enough time; good enoughB. time enough; enough goodC. enough time; well enoughD. time enough; enough well9. To have a more ____ place, eating or drinking on the subway in Beijing is not allowed(允许).A. relaxedB. meaningfulC. crowedD. comfortable10. The boy kept ____ silly questions. This made his father ____.A. ask; angrilyB. to ask; angryC. asked; angrilyD. asking; angry11. Wang Lin is so careful that be always checks his answers to ____ there are no mistakes.A. look outB. make sureC. find outD. think of12. There are ____ of books in our school library but only ____ are on art.A. hundred; two hundredB. hundreds; two hundredsC. hundreds; two hundredD. hundred; two hundreds13. ---Did you win the game yesterday? --- Not really. ____ we all tried out best, we lost it.A. IfB. ThoughC. AndD. Because14. ---If there are ____ people driving, there will be ____ pollution.--- Yes, the air will be fresher if we do like this.A. more; moreB. more; lessC. fewer; lessD. fewer; more15. Many students are getting ready ____ part in the school sports meeting.A. takeB. takingC. to takeD. tookⅡ.完型填空(每题2分,共20分)Now more and more people get to know that exercise is important. We__16__ need to exercise. Doctors say it is good for us. It makes us __17__ and healthier. __18__ who often exercise are more alert (机灵的). This means they do __19__ in exams and schoolwork than those who don’t exercise.There are many ways __20__. You can walk, run, swim, or play ball games. You have to like __21__ you’re doing. Try all kinds of things until you find one, two, or __22__ three sports that you feel right for you. It’s best to exercise twice a week. Thirty minutes each time __23__ enough (足够的).You can exercise at fitness centers(健身中心). They have a lot of equipment(器材). The equipment can__24__ exercise your arms, legs and __25__ parts of your body you healthy. Some people buy equipment for their homes, but it is very expensive.16. A. every B. both C. all D. some17. A. happy B. happier C. happily D. more happily18. A. Teachers B. Parents C. Friends D. Children19. A. well B. better C. badly D. worse20. A. exercise B. to exercise C. exercising D. for exercising21. A. where B. why C. who D. what22. A. just B. still C. even D. only23. A. is B. are C. do D. does24. A. use B. boring C. spend D. help25. A. make B. made C.to make D. makingⅢ.阅读理解(每题2分,共20分)(A)Here are some students’ New Year’s resolutions.My name is Lucy. I’m going to do my best at school. I’m going to finish my homework on time. If I need some help with a subject, I am going to ask my teacher for help.My name is Dave. I’m going to eat some fruit and vegetables every day. I’m going to drink more water and milk. I’m also going to brush my teeth after meals every day and wash my hands after going to the bathroom.My name is Tina. I’m going to meet more people and make more friends this year. I’m also going to be nice to other kids in my class. I’m going to be friendly to kids who need friends—like someone who is shy or new.I’m Tony. I’ll never give out personal information such as my name, home address and telephone number on the Internet. Also, I ‘ll never send a picture of myself to someone online without my parents’ permission.26.How many students made their New Year’s resolutions here?A.OneB. TwoC. FourD. Five27.Who made New Year’s resolutions about studying?A.LucyB. DaveC. TinaD. Tony28.What isn’t Dave going to do to keep healthy?A.To eat fruit and vegetables every day.B. To drink less water and milk.C. To brush teeth after meals every day.D. To wash hands after going to work hard.29.What is Tina going to do?A.She is going to finish homework on time.B. She is going to drink more water and milk.C. She is going to be friendly to other kids.D. She is going to work hard.30.What do you think of Tony?A.He loves studying.B. He isn’t healthy.C. He loves using the Internet.D. He is outgoing.(B)Work is helpful to health. Scientists find that the hard-working people live longer than those who have no jobs. Studies show that Career(职业)women are healthier than housewives.Why is work good for health?It is because work keeps people busy,away from loneliness(孤独). Research shows that people feel unhappy and worried when they have nothing to do. Instead,the happiest people are those who are busy. Many successful people usually love their careens. They feel they are the happiest when they are working hard. By working, people get to know each other. By taking part in all kinds of activities, they find friendship and warmth. This is helpful to health. The loss(丧失) of work means the loss of everything. It affects man's spirit and it will cause more illnesses.Besides,work gives one a sense(感觉)of hope and a sense of achievement(成就). When a writer finishes his writing or a doctor successfully saves a patient’s or a teacher sees his students grow,they are very happy..31..How will people feel when they have nothing to do from the passage?___A..Relaxed and excited.B..Happy but bored.C..Worried and unhappy.D..Relaxed but unhappy.32..Who are the happiest people according to the passage?A..Those who are rich.B..Those who are friendly.C..Those who are famous.D..Those who are busy.33..The underlined word "it" in the passage refers to (指代)____.A..the loss of happiness.B..the loss of work.C..the loss of energy.D..the loss of health.34..What's the main idea of this passage?___A..If you are happy,you will have more work to do.B..If you are healthy,you will have more work to do.C..The more you work,the happier and healthier you will be.D..The more work you do,the more money you will have.35. Where is the passage probably from?A. A magazineB. A storyC. A songD. A TV showIV 任务型阅读(每题2分,共10分)Do you have any online classes? It is possible to take classes at home. All you need is a computer and a headset(耳机). However, different people have different ideas on online classes.Most students don't seem to like online classes. According to a recent survey, only 33 percent of students would take such classes. Over 1,500 students from 10 cities took the survey.Many students said it is hard to focus (集中精力)on studying when have online classes. “There are no classmates, no real teachers watching me. I can use the internet or do o ther things if I want to. It's harder to always keep focused," Lian Ruohan, one of the students said.Lian has to prepares(准备)a lot before taking her online classes to make sure she will pay attention(注意). She also makes herself talk with teachers. Students can come up with or answer questions when taking online classes.But Wen Jiayi, 14, a student from Chengdu, thinks online teachers don't really get to know her: “When I don't hand in(上交) homework, all I get is a short message instead of real concern (关心),” she said.However, online classes still have advantages(优点). “It saves time and money compared (比较)to taking offline classes. Also, if I don't understand some parts of a lesson, I can watch it over again," Lian said.36,37题完成句子;38题简略回答问题;39题概括并写下全文的主题句;40题将文中画线句子译成汉语。
石家庄市第二十三中学初三化学上册期末化学试题(含答案)
石家庄市第二十三中学上册期末化学试题(含答案)一、九年级化学上册选择题 1.下列说法正确的是A .12g 碳和80g 的氧气充分反应生成92g 二氧化碳B .用酚酞试液无法区分稀盐酸和食盐水C .加热Ca(OH)2的饱和溶液,溶质的质量分数保持不变D .加热一定量高锰酸钾固体制氧气,剩余固体中钾元素的质量分数保持不变 2.下列实验设计合理的是( )A .测定空气中氧气含量B .探究燃烧的条件C .验证质量守恒定律D .氧气验满3.已知:22Mg OH M O (gO+H ),CaCO 3高温CaO+CO 2↑。
取12.9gMg (OH )2和CaCO 3的混合物,加热,剩余固体质量随时间变化如图所示。
下列说法错误的是A .x 点剩余固体成分为CaCO 3、MgO 和Mg (OH )2B .y 点剩余固体中镁元素质量为1.2gC .z 点发生的反应为CaCO 3高温CaO+CO 2↑D .若剩余固体中钙元素的质量分数为36.0%,则剩余固体的成分为CaCO 3和MgO 4.工业上常用高温煅烧石灰石的方法来制得生石灰,发生的反应为32CaCO CaO+CO 点燃。
现取一定量的石灰石样品进行煅烧(假设杂质不变),某变量y 随时间的变化趋势如图所示,则纵坐标表示的是( )A .生成CO 2的体积B .生成CaO 的质量C .固体中杂质的质量分数D .固体中氧元素的质量分数5.有 C 5H 10、C 3H 6O 、C 6H 12O 6 组成的混合物,经测定含氧元素的质量分数为30%,则碳元素的质量分数为( ) A .60%B .45%C .30%D .22.5%6.在一个密闭容器中放入甲、乙、丙、丁四种物质,在一定条件下发生化学反应,一段时间后,测得有关数据如下表,则下列说法正确的是 物质 甲 乙 丙 丁 反应前质量(g) 4 31 21 10 反应后质量(g)4406XA .甲一定是该反应的催化剂B .该反应的生成物只有一种C .丙物质一定属于化合物D .参加反应的乙、丁质量比为5:27.下列实验不能达到实验目的的是( )A.探究镁与锌的金属活动性强弱B.探究可燃物燃烧的条件C.比较不同物质微粒间的空隙大小D.比较空气与人体呼出的气体中CO2的含量8.下列图象能正确反映其对应关系的是A.某温度时,向一定量的饱和氢氧化钙溶液中加入少量氧化钙,再恢复到原温度B.加热的饱和溶液的KNO3和饱和溶液的Ca(OH)2(不考虑溶剂的蒸发)C.向等质量、等浓度的稀硫酸中分别加入过量的Zn和FeD.将水通电一段时间9.在一个密闭容器中放入甲、乙、丙、丁四种物质,在一定条件下发生反应,一段时间后,测得有关数据如表,则关于此反应认识不正确的是()物质甲乙丙丁反应前质量/g203220反应后质量/g X2820A.该反应的基本类型为化合反应B.反应后甲物质的质量值x=15C.物质丙可能是该反应的催化剂D.参加反应的丁物质与生成的乙物质的质量比为4:710.现将一定质量的铜粉和碳粉的混合物在空气中充分灼烧,最后所得剩余固体的质量与原混合物的质量相同,则原混合物中铜粉与碳粉的质量比为A.4:1 B.1:1 C.16:3 D.32:311.蜡烛(足量)在如图所示密闭的集气瓶内燃烧至熄灭,测得瓶内氧气体积分数的变化如图所示。
河北省石家庄市第二十三中学2020-2021学年高二数学文期末试题含解析
河北省石家庄市第二十三中学2020-2021学年高二数学文期末试题含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 如图,在正方体中,M、N分别是的中点,则下列判断错误的是A.与垂直 B.与垂直C.与平行 D.与平行参考答案:D略2. 若,则()A. B. C. D.参考答案:D略3. 线性回归方程必经过的点是( ).A.(0,)B.C.D.参考答案:D4. 记者要为5名志愿者和他们帮助的2位老人拍照,要求排成一排, 2位老人相邻但不排在两端,不同的排法共有( )A.1440种B.960种C.720种D.480种参考答案:A5. 在数列1,2,2,3,3,3,4,4,4,4,…中,第31项为()A.5 B.6 C.7 D.8参考答案:D【考点】81:数列的概念及简单表示法.【分析】将数列进行重新分组进行计算即可.【解答】解:由数列的规律得数列项为n的时候有n个数,则由1+2+3+…+n≥31得≥31,即n(n+1)≥62,则当n=7时,7×8=56≥62不成立,当n=8时,8×9=72≥62成立,即第31项为8,故选:D.【点评】本题主要考查数列的概念和表示,根据数列寻找规律是解决本题的关键.6. 如果执行下面的算法框图,输入x=-2,h=0.5,那么输出的各个数的和等于().A.3 B.3.5 C.4 D.4.5参考答案:B略7. 若实数x,y满足不等式组,则的最大值为()A. 0B. 4C. 5D. 6参考答案:B【分析】确定不等式组表示的平面区域,明确目标函数的几何意义,即可求得z=2x+y的最大值.【详解】不等式组表示的平面区域如图:z=2x+y表示直线y=﹣2x+z的纵截距,由图象可知,在A(1,2)处z取得最大值为4故选:B.【点睛】本题考查线性规划知识,考查数形结合的数学思想,解题的关键是确定不等式组表示的平面区域,明确目标函数的几何意义,属于基础题.8. 已知空间向量,,,则下列结论正确的是()A.a∥c且a∥b B.a⊥b且a⊥c C.a∥c且a⊥b D.以上都不对参考答案:C9. 双曲线的渐近线方程为()A、 B、 C、 D、参考答案:D10. 已知某8个数的平均数为5,方差为2,现又加入一个新数据5,此时这9个数的平均数为,方差为S2,则()A.B.C.D.参考答案:A【考点】极差、方差与标准差;众数、中位数、平均数.【分析】由题设条件,利用平均数和方差的计算公式进行求解.【解答】解:∵某8个数的平均数为5,方差为2,现又加入一个新数据5,此时这9个数的平均数为,方差为S2,∴==5,=,故选A .【点评】本题考查平均数和方差的计算公式的应用,是基础题.解题时要认真审题,仔细解答.二、 填空题:本大题共7小题,每小题4分,共28分 11. 在棱长为1的正方体中,BD 与所成的角是 ,AC与所成的角是 。
河北省石家庄市第二十三中学2021-2022学年九年级上学期开学考试英语试题
河北省石家庄市第二十三中学2021-2022学年九年级上学期开学考试英语试题学校:___________姓名:___________班级:___________考号:___________一、单项选择1.This story is_________ simple English. My little sister can read it.A.for B.in C.with D.by 2.—What about these two coats, madam?—________ of them fits me. Could you show me another one?A.Either B.Neither C.Both D.None 3.—I’ll be away for a long time.—Don’t worry. She can look after your pet ________.A.careful enough B.enough carefulC.carefully enough D.enough carefullyA.much: happier B.more; happy C.more: happier D.most: happiest 5.The school sports meeting will be ________ because of the heavy rain.A.put up B.put on C.put off D.put down 6.The teachers often tell us _____in the river.It's dangerous.A.not swim B.don't swimC.not swimming D.not to swim7.—Mike, let’s prepare for our basketball game.—OK. We’ll lose the game ________ we try our best.A.unless B.once C.after D.since 8.Students in Grade Nine ________ a math exam when I saw them.A.take B.are taking C.were taking D.have taken 9.(2016 • 江苏省宿迁市中考)My grandparents ____________ for over 60 years and they love each other very much.A.have been married B.got married C.were marriedD.have got married10.–You don’t look well. ______ with you?--I have a fever and can’t stop coughing.A.What’s happening B.What is it C.What’s onD.What’s the matter二、完形填空When I was 13, a girl gave me an important gift. It was a 11 .It was the early autumn of my first year at a new school. 12 knew me, I was very lonely and afraid to make friends with anyone.Every time I heard the other students talking and laughing. I felt even more lonely. I couldn’t 13 anyone about my problem and I did not want my parents to 14 about me.One day my classmates were talking with the friends, but I sat in 15 . At that moment (时刻), a girl 16 the classroom, I did not know who she was. She passed me and then 17 . She looked at me and, without a word, smiled.Suddenly I felt the touch of something bright and friendly. It made me feel happy, lively and 18 .That smile did change my 19 . I started to talk with the other students. Day by day I learned to 20 people and they included me in their circle (圈子) of friends. The girl with the bright senile has become my best friend now, and we stick together like glue.One day I ask her why she smiles at me at that day. She said she could not remember!Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. My advice is smile at the world and it will smile back. 11.A.advice B.laugh C.smile D.friendship 12.A.Anyone B.Someone C.Everyone D.No one 13.A.talk on B.talk with C.talk about D.talk of 14.A.care B.think C.worry D.coasider 15.A.quiet B.silence C.surprise D.excitement 16.A.came B.went C.walked D.entered 17.A.turned back B.turned into C.turned down D.turned to 18.A.cool B.cold C.hot D.warm 19.A.study B.smile C.life D.friend 20.A.like B.love C.trust D.touch三、阅读单选A father and his son went to a kite-flying festival. The son was full of joy when he saw the sky filled with colorful kites. He wanted to fly a kite, too. The father then bought a kite for him.The son started to fly the kite. Soon, his kite was high up in the sky. After a while, he said, “Father, it seems that the string (线) is stopping the kite from flying higher. If we cut it, the kite will be free and fly even higher. Can we cut it?” The father cut the string. The kite started to go higher. This made the little boy happy.But then, slowly, the kite started to come down. And finally it fell to the ground. The son was surprised to see this. He asked his father, “I thought that after cutting the string, the kite would fly higher. Why did it fall down?”The father explained, “The string was not stopping the kite from going higher, but was helping it stay in the sky. You helped the kite go up in the right direction using the string. But when you cut the string, it could no longer support the kite.”Sometimes, we may feel like there are certain things that are holding us back and stopping us growing. But in fact, these might be the things that support us the most. 21.How did the boy feel when he saw the colorful kites?A.Strange.B.Happy.C.Relaxed.D.Surprised. 22.Why did the son want to cut the string?A.Because he preferred to use a longer one.B.Because he found the string was not strong.C.Because he liked the string.D.Because he thought the kite would fly higher.23.What can we learn from the passage?A.We can fly kites in our free time with our parents.B.Flying kites can make people healthy.C.The things that hold us back can also support us.D.Children like flying kites.Let’s Explore the Nature!Spring is coming! Do you want to have a wonderful and meaningful time during breaks?Program cost: $ 200 for members; $ 230 for non-members.How to do: Simply come to our center to get an application form. Send your completed from to us before March 20th, 2021Notes:1. No free lunches are offered. You may either bring box lunch or pay for lunch at our restaurants.2. Both programs will start 1 DAY later if there is a warning of sandstorms.24.Who can join the Three-Day Spring Program?A.Children under 6B.Students over 16C.Children aged 7~9D.Students aged 12~14.25.How much should one member and two non-members pay for the program?A.$ 600.B.$ 630C.$ 660D.$ 700. 26.Which is TURE according to the passage?A.There is more than l5 members in each group.B.You can join the spring program any time.C.You need to hand in an application form.D.Everyone can have free lunch at our restaurants.Whether from news, reports or social media articles, you may know that 5G is coming.5G is the 5th generation network. It is a new network after 1G, 2G, 3G and 4G and it can connect everyone and everything together. 5G means super-fast data (数据) speed. One can download a two-hour movie in fewer than 10 seconds, and it is making our lives more and more convenient.5G will make self-driving cars possible. For safety, self-driving cars need super-fast data transmission (传输) to communicate with their nearby environment. 5G is just what makes self-driving cars achieve this. Even airplanes will become “smart” in the near future.5G will be a big help for students who take online classes. Students all over the world will be able to see places like the Great Wall without leaving their rooms.It will be also easier for doctors to treat patients remotely by 5G. It means caring for patients from far away.The facts listed above are only part of what 5G will make possible and popular. Just as in the early days of the Internet in the 1990s, few could see how it could change the world. The same will surely be true of 5G. With 5G, many things do not seem like dreams to anyone. Now let’s get ready to say goodbye to 4G and welcome the coming of 5G.27.How long may it take to download a two-hour movie with 5G?A.15 seconds.B.8 seconds.C.10 minutes.D.2 hours. 28.From the last paragraph, we can know that ________.A.4G is no more used in our daily life now B.the writer is worried about the coming of 5GC.with 5G, some of our dreams will come true for sure one day D.in the 1990s, all the people believed that the Internet would change our life29.5G will make the following things more and more popular EXCEPT ________.A.self-driving cars B.“smart” airplanes C.online classesD.hospitals with doctorsZhang Guimei show us how to be a good teacher and the importance of a teacher in students’ lives.In 2009, Zhang Guimei founded the Huaping High School for Girls in Lijiang, Yunnan Province. This is a special high school which did not ask for tuition fees (学费) from girls in poor families. In 2003, Zhang began to raise money for the school, but her efforts were often met with suspicion and even misunderstanding. During 2003 and 2007, Zhang spent her sparetime asking people to make donations (捐款) for her school. However, the money she got was not enough. In 2007, after her dream was reported by the media (媒体), the government promised to help her project.Zhang carries on strict school rules. She plans every minute of her students’ timetable. At 5:20 a. m., she wakes up all the girls. They must take a nap in the afternoon. They are only allowed three hours a week outside of the school. And long hair is not allowed in school. She wants to change the lives of many girls from poor families through education.Eleven years later, over 1,600 girl students have graduated from the school and received higher education-including many famous universities in China.When people asked why she made so many efforts to help girls in the mountains to receive better education, she just said, “I believe it is really important for girls to receive education. I hope they can live happier than me. And it will be the greatest comfort to me.”30.When was the Huaping High School for Girls set up?A.In 2003.B.In 2005.C.In 2007.D.In 2009. 31.What does the underlined word “suspicion” in Paragraph 2 mean?A.Support.B.Understand.C.Doubt.D.Trust. 32.What does the third paragraph mainly tell us?A.All the students get up early to study.B.There are strict rules in the school.C.Long hair is not allowed in the school.D.Zhang is a kind mother for the students.33.Why did Zhang make so many efforts to help those girls?A.Because she was asked to do so by their parents.B.Because she thought girls were as clever as boys.C.Because she wanted them to live more happily than her.D.Because those girls’ parents had paid lots of attention to their study.34.What is the best title for the text?A.A Good And Strict Teacher B.A Common High School for GirlsC.A Famous High School in China D.Girl Students from Poor Families四、多任务混合阅读阅读短文,并按要求完成下面小题。
河北省石家庄市第二十三中学2024-2025学年九年级上学期英语期中试卷
河北省石家庄市第二十三中学2024-2025学年九年级上学期英语期中试卷一、完形填空Since 2008, the program called “First class begins” has been put on the TV screen. The year 2023 was no exception (例外). This year’s 1 is “Building a Strong Country with Me”In the program, guests from all fields of life were 2 to share their thoughts with students. The Shenzhou-16 astronauts 3 special gifts to students. They explained these three 4 “upward mobility (上进心)”, “curiosity (好奇心)” and “original aspiration (初心)” with their own experiences. “I have always dreamed of exploring space 5 I was a student. Now I have become a real astronaut, looking at the 6 home—earth from our Chinese space Station,” said Zhu Yangzhu, “Never give up, and our efforts will pay off.” Their experiences have 7 added new life to these three words.With hard work, curiosity and a strong will, we can 8 our dreams and play a part in building a better country. Lots of people have shown 9 the way. Let’s keep the advice in mind, keep 10 and try our best to bring out the best in ourselves.1.A.subject B.speech C.symbol D.object 2.A.expected B.invited C.allowed D.supposed 3.A.bought B.sent C.receive D.accepted 4.A.ideas B.names C.words D.rules 5.A.since B.until C.though D.because 6.A.different B.common C.strange D.close 7.A.carefully B.successfully C.rapidly D.slowly 8.A.imagine B.change C.achieve D.discover 9.A.them B.his C.us D.her10.A.alive B.quiet C.calm D.brave二、短文填空阅读下面短文,在空白处填入一个适当的单词或用括号内单词的正确形式。
2022-2023学年河北省石家庄市第二十三中学九年级上学期期中物理题
2022-2023学年河北省石家庄市第二十三中学九年级上学期期中物理题1.下列现象中,与扩散现象有关的是()A.大雾弥漫B.花香扑鼻C.柳絮飞扬D.尘土飞扬2.下列事例中,利用热传递改变物体内能的是()A.流星坠入大气层与空气摩擦生热B.用锯条锯木头,锯条发热C.人站在阳光下暴晒,感到很热D.古时候,人们利用钻木取火3.关于温度,热量和内能,下列说法正确的是()A.冰比水感觉更冷,因为冰的内能比水的内能少B.一根铁丝温度升高,内能一定增加,但不一定是吸收了热量C.减肥期间不宜吃大量巧克力,是因为巧克力含有的热量较多D.向上缓缓托起课本,对课本做了功,课本的内能增大4.恩格斯曾说过:“摩擦生火第一次使人支配了一种自然力,从而最终把人和动物分开。
”如图所示,“钻木取火”时()A.产生的内能无法自主转化为其他形式的能B.能量的转换与热机的做功冲程相同C.手握的木钻将内能转移给了木柴D.木柴燃烧越充分,其热值越高5.如图所示是内燃机工作循环中的一个冲程,它是A.压缩冲程,将化学能转化成内能B.压缩冲程,将机械能转化成内能C.做功冲程,将内能转化成机械能D.做功冲程,将机械能转化成内能6.下列四组物品中,通常情况下都属于导体的是()A.金属勺、铅笔芯B.塑料瓶、空气C.玻璃杯、钢尺D.电炉丝、橡皮7.在气候干燥的冬天,司机接触汽车时经常会被“电”一下,手拿“静电消除器”接触汽车可以防止被“电”。
下列选项不正确的是()A.汽车带电是因为汽车行驶时与空气摩擦发生了摩擦起电现象B.汽车上的“电”往往会使汽车吸附更多的灰尘C.静电消除器前端应选用可导电材质D.若汽车带的是负电,则瞬间电流方向由汽车流向消除器8.为了加强校园安全,很多学校门口安装了人脸识别测温系统。
人脸识别通过,开关闭合;红外测温正常,开关闭合。
人脸识别通过和体温正常均满足时,闸道门电动机电源接通,打开闸门。
则下列电路的设计符合要求的是()A.B.C.D.9.在如图所示的电路中,闭合开关,、均发光,电压表、、的示数分别为、、,电流表、、的示数分别为、、,可以判断()A.B.C.D.10.在如图(a)所示电路中,V1、V2都是有0~3V和0~15V两个量程的电压表。
河北省石家庄第二十三中学2024-2025学年九年级10月月考语文试题(含答案)
2024-2025学年第一学期学业水平检测一九年级语文部编版(试卷页数:8页,考试时间:120分钟,总分:120分)第一部分(1~2题12分)下面是河北文旅发布的“灯火里的河北,别样的美”宣传稿件。
光影交织的街区,令人甲(眼花缭乱/目不暇接);韵味悠长的古镇,让人流连忘返;自然淳朴的乡村,让心灵得到栖息……“灯火里的河北”活力迸发。
河头老街,千米运河被78个巨型“唐”字灯柱点亮,灯柱的倒影似一幅五彩斑斓的画卷。
龙泉古镇推陈出新,打造充满故事性的现代旅游体验项目,让游客耳目一新。
广袤星空下的乡村(kuàng yě),点亮了山水田园间的灯火。
暮色弥漫,大洼村灯火通明,整个村子梦幻、朦胧。
游客_______可以在民宿露台上煮茶品茗,抬头(n íng wàng),与满天星斗对话,低头倾听,陪夏虫呢喃,_______可以对月小酌,浅唱低吟。
远离尘嚣、沉醉自然,_______(探寻/探索)有本土味道的“诗和远方”。
________________________________________________________,灯火里的河北,别样的美。
1.阅读上面文字,回答后面的问题。
(共8分)(1)根据文段中的拼音写出相应的词语。
(2分)①(kuàng yě)______________ ②(níng wàng)______________(2)为文段中加点字注音。
(2分)①栖息______________ ②露台______________(3)“器”字是会意字,按部首查字法,可查_______部。
它的义项有:①喧哗;②嚣张,强悍;③夸耀;④轻浮,轻薄。
“尘嚣”中该字的解释应为:_______(填序号)。
(2分)(4)在括号内选择符合语境的词语,填在下面横线上。
(2分)甲:______________ 乙:______________2.九年级同学围绕这期宣传稿,策划了语言文字的探究活动,请你参加并完成任务。
河北省石家庄市第二十三中学2024-2025学年数学九上开学教学质量检测试题【含答案】
河北省石家庄市第二十三中学2024-2025学年数学九上开学教学质量检测试题题号一二三四五总分得分批阅人A 卷(100分)一、选择题(本大题共8个小题,每小题4分,共32分,每小题均有四个选项,其中只有一项符合题目要求)1、(4分)已知a >b ,c≠0,则下列关系一定成立的是().A .ac >bc B .a b c c >C .c-a >c-b D .c+a >c+b 2、(4分)如图,在矩形ABCD 中,点E 是AD 中点,且AE 2=,BE 的垂直平分线MN 恰好过点C ,则矩形的一边AB 的长度为()A .2B C D .43、(4分)如图,反比例函数y =k x (k ≠0,x >0)图象经过正方形ABCD 的顶点A ,边BC 在x 轴的正半轴上,连接OA ,若BC =2OB ,AD =4,则k 的值为()A .2B .4C .6D .84、(4分)某地需要开辟一条隧道,隧道AB 的长度无法直接测量.如图所示,在地面上取一点C,使点C 均可直接到达A,B 两点,测量找到AC 和BC 的中点D,E,测得DE 的长为1100m,则隧道AB 的长度为()A .3300m B .2200m C .1100m D .550m 5、(4分)如图,在平面直角坐标系中,等边△OAB 的顶点B 的坐标为(2,0),点A 在第一象限内,将△OAB 沿直线OA 的方向平移至△O′A′B′的位置,此时点A′的横坐标为3,则点B′的坐标为()A .(4,2)B .(3,3)C .(4,3)D .(3,2)6、(4分)六边形的内角和为()A .720°B .360°C .540°D .180°7、(4分)如果一个正多边形的中心角为60°,那么这个正多边形的边数是()A .4B .5C .6D .78、(4分)龙华地铁4号线北延计划如期开工,由清湖站开始,到达观澜的牛湖站,长约10.770公里,其中需修建的高架线长1700m .在修建完400m 后,为了更快更好服务市民,采用新技术,工效比原来提升了25%.结果比原计划提前4天完成高架线的修建任务.设原计划每天修建xm ,依题意列方程得()A .170017004(125)x x -=+%B .170040017004004(125)x x ---=+%C .170017004004(125)x x --=+%D .170040017004004(125)x x ---=+%二、填空题(本大题共5个小题,每小题4分,共20分)9、(4分)如图,在矩形ABCD 内放入四个小正方形和两个小长方形后成中心对称图形,其中顶点E ,F 分别在边AD ,BC 上,小长方形的长与宽的比值为4,则AD AB 的值为_____.10、(4分)计算:π0-(13)-1=______.11、(4分)如图,点O 是平行四边形ABCD 的对角线交点,AD AB >,,E F 是AB 边上的点,且12EF AB =;,G H 是BC 边上的点,且13GH BC =,若12,S S 分别表示EOF ∆和GOH ∆的面积,则12:S S =__________.12、(4分)如图,将一张矩形纸片ABCD 沿EF 折叠后,点C 落在AB 边上的点G 处,点D 落在点H 处.若∠1=62°,则图中∠BEG 的度数为_____.13、(4分)如果a -b =2,ab =3,那么a 2b -ab 2=_________;三、解答题(本大题共5个小题,共48分)14、(12分)解不等式.15、(8分)如图,直线y=2x+3与x 轴相交于点A ,与y 轴相交于点B .(1)求A ,B 两点的坐标;(2)过B 点作直线BP 与x 轴相交于P ,且使OP=2OA ,求直线BP 的解析式.16、(8分)现代互联网技术的广泛应用,催生了快递行业的高速发展,据调查,某家快递公司,今年三月份与五月份完成投递的快件总件数分别是5万件和6.05万件,现假定该公司每月投递的快件总件数的增长率相同.()1求该公司投递快件总件数的月平均增长率;()2如果平均每人每月可投递快递0.4万件,那么该公司现有的16名快递投递员能否完成今年6月份的快递投递任务?17、(10分)如图,AD 是△ABC 边BC 上的高,用尺规在线段AD 上找一点E ,使E 到AB 的距离等于ED (不写作法,保留作图痕迹)18、(10分)重庆不仅是网红城市,更是拥有长安,力帆等大型车企的一座汽车城,为了更好的推广和销售汽车,每年都会在悦来会展中心举办大型车展.去年该车展期间大众旗下两品牌汽车迈腾和途观L 共计销售240辆,迈腾销售均价为每辆20万元,途观L 销售均价为每辆30万元,两种车型去年车展期间销售额共计5600万元.(1)这两种车型在去年车展期间各销售了多少辆?(2)在今年的该车展上,各大汽车经销商纷纷采取降价促销手段,而途观L 坚持不降价,与去年相比,销售均价不变,销量比去年车展期间减少了a%,而迈腾销售均价比去年降低了a%,销量较去年增加了2a%,两种车型今年车展期间销售总额与去年相同,求a 的值.B 卷(50分)一、填空题(本大题共5个小题,每小题4分,共20分)19、(4分)计算:))201820192+的结果是_____.20、(4分)已知Rt △ABC ,∠ABC=90°,小明按如下步骤作图,①以A 为圆心,BC 长为半径作弧,以C 为圆心,AB 长为半径作弧,两弧相交于点D ;②连接DA ,DC ,则四边形ABCD 为___________.21、(4分)已知反比例函数4y x =的图象经过点()1,b -,则b 的值为______.22、(4分)若21x kx ++是完全平方式,则k 的值是__________.23、(4分)已知分式2+24-+x x x a ,当x =1时,分式无意义,则a =___________.二、解答题(本大题共3个小题,共30分)24、(8分)如图,在长方形OABC 中,O 为平面直角坐标系的原点,点()2,2A m m -+在x 轴上,点()1,6C n n -在y 轴上,点B 在第一象限内,点P 从原点出发,以每秒2个单位长度的速度沿着O C B A O ----的路线移动(即沿着长方形的边移动一周).(1)分别求出A ,C 两点的坐标;(2)当点P 移动了4秒时,求出点P 的坐标;(3)在移动过程中,当三角形OBP 的面积是10时,求满足条件的点P 的坐标及相应的点P 移动的时间.25、(10分)解方程:(1)x (2x +3)=4x +6计算:(2)-+(3)20182017(3(3-⨯+26、(12分)如图,在6×6的方格图中,每个小方格的边长都是为1,请在给定的网格中按下列要求画出图形.(1)画出以A的一条线段.(2)画出一个以题(1)中所画线段为腰的等腰三角形.参考答案与详细解析一、选择题(本大题共8个小题,每小题4分,共32分,每小题均有四个选项,其中只有一项符合题目要求)1、D【解析】根据不等式的基本性质一一判断可得答案.【详解】解:A、当c<0时,不等式a>b的两边同时乘以负数c,则不等号的方向发生改变,即ac <bc.故本选项错误;B、当c<0时,不等式a>b的两边同时除以负数c,则不等号的方向发生改变,即a bc c <.故本选项错误;C、在不等式a>b的两边同时乘以负数-1,则不等号的方向发生改变,即-a<-b;然后再在不等式的两边同时加上c,不等号的方向不变,即c-a<c-b.故本选项错误;D、在不等式a>b的两边同时加上c,不等式仍然成立,即a+c>b+c;故本选项正确.故选D.本题主要考查的是不等式的基本性质.不等式的性质1:不等式两边加(或减)同一个数(或式子),不等号的方向不变.即如果a>b,那么a±c>b±c;不等式的性质2:不等式两边乘(或除)以同一个正数,不等号的方向不变.即如果a>b,c>0,那么ac>bc或(ac>bc);不等式的性质3:不等式两边乘(或除)以同一个负数,不等号的方向改变.即如果a>b,c<0,那么ac<bc或(ac<bc).2、C【解析】连接CE,根据线段中点的定义求出DE、AD,根据矩形的对边相等可得BC=AD,根据线段垂直平分线上的点到两端点的距离相等可得CE=BC,再利用勾股定理列式求出CD,然后根据矩形的对边相等可得AB=CD.【详解】如图,连接CE ,∵点E 是AD 中点,∴DE=AE=2,AD=2AE=2×2=4,∴BC=AD=4,∵BE 的垂直平分线MN 恰好过点C ,∴CE=BC=4,在Rt △CDE 中,由勾股定理得,∴故选C .本题考查了矩形的性质,线段垂直平分线上的点到两端点的距离相等的性质,勾股定理,难点在于作辅助线构造出直角三角形.3、D 【解析】根据正方形的性质,和BC =2OB ,AD =4,可求出OB 、AB ,进而确定点A 的坐标,代入求出k 即可.【详解】解:∵正方形ABCD ,AD =4,∴AB =AD =4=BC ,∵BC =2OB ,∴OB =2,∴A (2,4),代入y =k x 得:k =8,故选:D .本题考查了反比例函数与几何问题中k 的求解,解题的关键是根据几何图形的性质得出反比例函数图象上点的坐标.4、B 【解析】∵D ,E 为AC 和BC 的中点,∴AB=2DE=2200m ,故选:B.5、A 【解析】作AM ⊥x 轴,根据等边三角形的性质得出OA=OB=2,∠AOB=60°,利用含30°角的直角三角形的性质求出OM=OA=1,即可求出AM 的长,进而可得A 点坐标,即可得出直线OA 的解析式,把x=3代入可得A ′点的坐标,由一对对应点A 与A ′的移动规律即可求出点B ′的坐标.【详解】如图,作AM ⊥x 轴于点M ,∵等边△OAB 的顶点B 坐标为(2,0),∴OA=OB=2,∠AOB=60°,∴OM=OA=1,AM=OM=,∴A (1,),∴直线OA 的解析式为:y=x ,∴当x=3时,y=3,∴A ′(3,3),∴将A 点向右平移2个单位,再向上平移2个单位后得到A ′点,∴将B (2,0)向右平移2个单位,再向上平移2个单位后可得到B ′点,∴点B ′的坐标为(4,2),故选A 本题考查坐标与图形变化—平移及等边三角形的性质,根据等边三角形的性质得到平移规律是解题关键.6、A 【解析】根据多边形内角和公式2180()n -⨯︒,即可求出.【详解】根据多边形内角和公式2180()n -⨯︒,六边形内角和(62)180720=-⨯︒=︒故选A.本题考查多边形内角和问题,熟练掌握公式是解题关键.7、C 【解析】试题解析:这个多边形的边数为:36060 6.÷=故选C.8、C 【解析】设原计划每天修建xm ,则实际每天修建(1+25%)xm ,根据题意可得,增加工作效率之后比原计划提前4天完成任务,据此列方程.【详解】解:设原计划每天修建xm ,则实际每天修建(1+25%)xm ,由题意得:170017004004(125%)x x --=+故选C.二、填空题(本大题共5个小题,每小题4分,共20分)9、94【解析】连结EF ,作MN HN ⊥于N ,根据中心对称图形的定义和相似三角形的性质可得两直角边的比是2:1,进一步得到长AD 与宽AB 的比即可.【详解】解:连结EF ,作MN HN ⊥于N ,在矩形ABCD 内放入四个小正方形和两个小长方形后成中心对称图形,MNH FME ∴∆∆∽,MNH HKE ESP ∆≅∆≅∆,12MN FM NH EM ∴==,∴长AD 与宽AB 的比为()()4212:2119:4+++++=,即94AD AB =,故答案为:94.此题考查了中心对称图形、相似三角形的性质、全等三角形的性质、矩形的性质、正方形的性质等知识,关键是理解直角三角形两直角边的比是2:1.10、-1【解析】直接利用零指数幂和负整数指数幂的运算法则进行计算即可.【详解】原式=1-3=-1.故答案为:-1.本题主要考查实数的运算,掌握零指数幂和负整数指数幂的运算法则是解题的关键.11、3:1【解析】根据同高的两个三角形面积之比等于底边之比得112AOBS EF SAB ==,213BOC S GH S BC ==,再由点O 是▱ABCD 的对角线交点,根据平行四边形的性质可得S △AOB =S △BOC =14S ▱ABCD ,从而得出S 1与S 1之间的关系.【详解】解:∵112AOBS EF SAB ==,213BOC S GH S BC ==,∴S 1=12S △AOB ,S 1=13S △BOC .∵点O 是▱ABCD 的对角线交点,∴S △AOB =S △BOC =14S ▱ABCD ,∴S 1:S 1=12:13=3:1,故答案为:3:1.本题考查了三角形的面积,平行四边形的性质,根据同高的两个三角形面积之比等于底边之比得出112AOBS EF SAB ==,213BOC S GH S BC ==是解答本题的关键.12、56°【解析】根据矩形的性质可得AD//BC ,继而可得∠FEC=∠1=62°,由折叠的性质可得∠GEF=∠FEC=62°,再根据平角的定义进行求解即可得.【详解】∵四边形ABCD 是矩形,∴AD//BC ,∴∠FEC=∠1=62°,∵将一张矩形纸片ABCD 沿EF 折叠后,点C 落在AB 边上的点G 处,∴∠GEF=∠FEC=62°,∴∠BEG=180°-∠GEF-∠FEC=56°,故答案为56°.本题考查了矩形的性质、折叠的性质,熟练掌握矩形的性质、折叠的性质是解题的关键.13、6【解析】首先将a 2b -ab 2提取公因式,在代入计算即可.【详解】解:22=()ab a b ab a b --代入a -b =2,ab =3则原式=326⨯=故答案为6.本题主要考查因式分解的计算,关键在于提取公因式,这是基本知识点,应当熟练掌握.三、解答题(本大题共5个小题,共48分)14、.【解析】先去分母再移项,系数化为1,即可得到答案.【详解】将不等式两边同乘以2得,,解得.本题考查解一元一次不等式,解题的关键是熟练掌握一元一次不等式的求解方法.15、(1)(-32,0);(0,1);(2)y=x+1或y=-x+1.【解析】试题分析:(1)根据坐标轴上点的坐标特征确定A 点和B 点坐标;(2)由OA=32,OP=2OA 得到OP=1,分类讨论:当点P 在x 轴正半轴上时,则P 点坐标为(1,0);当点P 在x 轴负半轴上时,则P 点坐标为(-1,0),然后根据待定系数法求两种情况下的直线解析式.试题解析:(1)把x=0代入y=2x+1,得y═1,则B 点坐标为(0,1);把y=0代入y=2x+1,得0=2x+1,解得x=-32,则A 点坐标为(-32,0);(2)∵OA=32,∴OP=2OA=1,当点P 在x 轴正半轴上时,则P 点坐标为(1,0),设直线BP 的解析式为:y=kx+b ,把P (1,0),B (0,1)代入得303k b b +==⎧⎨⎩解得:1{3k b =-=∴直线BP 的解析式为:y=-x+1;当点P 在x 轴负半轴上时,则P 点坐标为(-1,0),设直线BP 的解析式为y=kx+b ,把P (-1,0),B (0,1)代入得03{3k b b=-+=解得:k=1,b=1所以直线BP 的解析式为:y=x+1;综上所述,直线BP 的解析式为y=x+1或y=-x+1.考点:1.一次函数图象上点的坐标特征;2.待定系数法求一次函数解析式.16、() 1该公司投递快件总件数的月平均增长率为()10%2该公司现有的16名快递投递员不能完成今年6月份的快递投递任务【解析】()1设该公司投递快件总件数的月平均增长率为x ,根据该公司今年三月份与五月份完成投递的快件总件数,即可得出关于x 的一元二次方程,解之取其正值即可得出结论;()2根据6月份的快件总件数5=月份的快递总件数(1⨯+增长率),可求出6月份的快件总件数,利用6月份可完成投递快件总件数=每人每月可投递快件件数⨯人数可求出6月份可完成投递快件总件数,二者比较后即可得出结论.【详解】解:()1设该公司投递快件总件数的月平均增长率为x ,根据题意得:25(1x) 6.05+=,解得:1x 0.110%==,2x 2.1(=-舍去).答:该公司投递快件总件数的月平均增长率为10%.()26月份快递总件数为:()6.05110% 6.655(⨯+=万件),0.416 6.4(⨯=万件),6.4 6.655<,∴该公司现有的16名快递投递员不能完成今年6月份的快递投递任务.本题考查了一元二次方程的应用,解题的关键是:()1找准等量关系,正确列出一元二次方程;()2根据数量关系,列式计算.17、见解析.【解析】利用基本作图,作∠ABD 的平分线交AD 于E ,则E 到AB 的距离等于ED .【详解】如图,点E 为所作.本题考查了作图-基本作图:熟练掌握基本作图(作一条线段等于已知线段;作一个角等于已知角;作已知线段的垂直平分线;作已知角的角平分线;过一点作已知直线的垂线).18、(1)去年车展期间迈腾销售了160辆,途观L 销售了80辆;(2)a 的值为12.1.【解析】(1)设去年车展期间迈腾销售了x 辆,途观L 销售了y 辆,然后根据题意列出二元一次方程组,解方程组即可;(2)根据题意,分别利用销售额=销售单价×销售量计算出迈腾和途观今年的销售额,然后列出方程,解方程即可.【详解】(1)设去年车展期间迈腾销售了x 辆,途观L 销售了y 辆,依题意得:24020305600x y x y +=⎧⎨+=⎩解得16080x y =⎧⎨=⎩,答:去年车展期间迈腾销售了160辆,途观L 销售了80辆.(2)依题意,得:20(1﹣a%)×160(1+2a%)+30×80(1﹣a%)=1600,整理得:8a ﹣0.64a 2=0,解得:a 1=12.1,a 2=0(舍去).答:a 的值为12.1.本题主要考查二元一次方程组的应用及一元一次方程的应用,读懂题意列出方程及方程组是解题的关键.一、填空题(本大题共5个小题,每小题4分,共20分)2+【解析】逆用积的乘方运算法则以及平方差公式即可求得答案.【详解】))201820192+=)))2018201822⨯⨯=)))201822⎡⎤⎣⎦⨯⨯++=(5-4)2018×)2,本题考查了积的乘方的逆用,平方差公式,熟练掌握相关的运算法则是解题的关键.20、矩形【解析】直接利用小明的作图方法得出四边形ABCD 是平行四边形,进而利用矩形的判定方法得出答案.【详解】解:根据小明的作图方法可知:AD =BC ,AB =DC ,∠B =90°,∵AD =BC ,AB =DC ,∴四边形ABCD 是平行四边形,∵∠B =90°,∴平行四边形ABCD 是矩形.故答案为:矩形.本题主要考查了复杂作图,正确掌握平行四边形的判定方法和矩形的判定方法是解题关键.21、-1【解析】将点的坐标代入反比例函数解析式即可解答.【详解】把点(-1,b )代入y=4x,得b=41-=-1.故答案是:-1.考查了反比例函数图象上点的坐标特征.函数图象上所有点的坐标均满足该函数解析式.22、2±【解析】根据完全平方公式即可求解.【详解】∵21x kx ++是完全平方式,故k=2±此题主要考查完全平方式,解题的关键是熟知完全平方公式的特点.23、1【解析】把x=1代入分式,根据分式无意义得出关于a 的方程,求出即可【详解】解:把x=1代入得:123143a a +=-+-,此时分式无意义,∴a-1=0,解得a=1.故答案为:1.本题考查了分式无意义的条件,能得出关于a 的方程是解此题的关键.二、解答题(本大题共3个小题,共30分)24、(1)点()4,0A ,点()0,6C ;(2)点()2,6P ;(3)①P (0,5),移动时间为52秒;②P (23,6),移动时间为103秒;③P (4,1),移动时间为:152秒;④P (103,0),移动时间为:253秒【解析】(1)根据点A ,点C 的位置即可解答;(2)根据点P 的速度及移动时间即可解答;(3)对点P 的位置分类讨论,根据三角形的面积计算公式即可解答.【详解】解:(1)点()2,2A m m -+在x 轴上,点()1,6C n n -在y 轴上,∴m+2=0,n-1=0,∴m=-2,n=1.∴点()4,0A ,点()0,6C (2)由(1)可知:点()4,0A ,点()0,6C 当点P 移动了4秒时,移动的路程为:4×2=8,∴此时点P 在CB 上,且CP=2,∴点()2,6P .(3)①如图1所示,当点P 在OC 上时,∵△OBP 的面积为10,∴1102OP BC ⋅=,即14102OP ⨯=,解得OP=5,∴点P 的坐标为(0,5),运动时间为:5522÷=(秒)②如图2所示,当点P 在BC 上时,∵△OBP 的面积为10,∴1102PB OC ⋅=,即16102BP ⨯=,解得BP=103,∴CP=23∴点P 的坐标为(23,6),运动时间为:210(6)233+÷=(秒)③如图3所示,当点P 在AB 上时,∵△OBP 的面积为10,∴1102PB OA ⋅=,即14102BP ⨯=,解得BP=5,∴AP=1∴点P 的坐标为(4,1),运动时间为:15(645)22++÷=(秒)④如图4所示,当点P 在OA 上时,∵△OBP 的面积为10,∴1102OP AB ⋅=,即16102OP ⨯=,解得OP=103,∴点P 的坐标为(103,0),运动时间为:1025(6464233+++-÷=(秒)综上所述:①P (0,5),移动时间为52秒;②P (23,6),移动时间为103秒;③P (4,1),移动时间为:152秒;④P (103,0),移动时间为:253秒.本题考查了平面直角坐标系中的坐标及动点运动问题,解题的关键是熟知平面直角坐标系中点的特点及动点的运动情况.25、(1)1232,2x x ==-(2);(3)111(0,1)(2,2)(3,1)A B O ---【解析】(1)方程整理为一般式后,利用因式分解法求解可得;(2)先化简各二次根式,再合并即可得;(3)原式变形为20172017(3(3--+⨯=2017(3--+,再进一步计算可得.【详解】解:(1)x (2x +3)=4x +6,2x 2+3x =4x +6,2x 2﹣x ﹣6=0,(x ﹣2)(2x +3)=0,∴x 1=2,x 2=32-;(2)原式=(3)原式=20172017(3(3--+⨯=2017(3--+=(31-⨯=111(0,1)(2,2)(3,1)A B O ---.本题主要考查解一元二次方程、二次根式的混合运算,解题的关键是掌握解一元二次方程的几种常用方法、二次根式的混合运算顺序和运算法则.26、(1)作图见解析;(2)作图见解析.【解析】(1)直接利用勾股定理结合网格得出答案;(2)利用等腰三角形的定义得出符合题意的一个答案.【详解】(1)如图所示:AB 即为所求;(2)如图所示:△ABC 即为所求.此题主要考查了应用设计与作图,正确应用网格是解题关键.。
河北省石家庄第二十三中学本部2021-2022学年九年级上学期期中考试物理试题
河北省石家庄市第二十三中学本部2021-2022学年九年级(上)期中考试物理试题学校:___________姓名:___________班级:___________考号:___________一、单选题1.某家用电器正常工作时的电流约为5A,它可能是()A.电冰箱B.电视机C.热水器D.电风扇2.下列哪种现象不能用分子动理论来解释()A.走进花园闻到花香B.放入水中的糖块会使水变甜C.天空中飞舞的雪花D.水和酒精混合后总体积变小3.生产生活中,我们常利用水的比热容大这一性质,下列事例中与这一性质无关的是()A.福岛核电站受损后灌注海水降温B.沿海地区的气温变化小C.在发热病人的额头上擦冷水降温D.晚间在春播秧田里灌水保温4.已知R2<R1,将图中的四种不同接法,接到同一电源两极间,则电路中电流最大的是A.B.C.D.5.小聪观察家里的冰箱,发现冰箱的灯在开冰箱门时亮,关冰箱门时灭;冰箱的压缩机则在需要制冷时才工作.关于冰箱里的灯和压缩机的连接方式,下列判断正确的是()A.一定是串联B.一定是并联C.有时是串联,有时是并联D.不能判断是串联还是并联6.下图中能直接测量通过灯L1的电流的电路是()A.B.C.D.7.根据欧姆定律UIR,下列哪种说法是正确的()A.通过导体的电流越大,这段导体的电阻就越小B.导体两端的电压越大,这段导体的电阻就越大C.导体的电阻与电压成正比,与电流成反比D.导体两端的电压越大,这段导体的电流就越大8.如图所示是新型节能应急台灯电路示意图,台灯充好电后,使用时可通过调节滑动变阻器接入电路的阻值R改变灯泡的亮度,假定电源电压、灯泡电阻不变,则灯泡两端电压U 随R变化的图像是图中()A.B.C.D.9.一般汽油机的一个工作循环分为四个冲程,每个冲程都伴随着能量的转移或转化,其中主要将机械能转化为内能的冲程是()A.吸气冲程B.压缩冲程C.做功冲程D.排气冲程10.下列常用学习用品①透明塑料笔袋①金属刀片①塑料三角板①铅笔芯①橡皮擦等物品.上述五种物品中,属于绝缘体的有()A.①①①B.①①①C.①①①D.①①①11.如图所示,电源电压U=2V不变,R=4Ω,虚线框内所有电阻均未知闭合开关,电流表示数为1A。
河北省石家庄市第二十三中学2021-2022学年九年级上学期10月月考数学试题
河北省石家庄市第二十三中学2021-2022学年九年级上学期10月月考数学试题学校:___________姓名:___________班级:___________考号:___________一、单选题1.下列方程中,是一元二次方程的是( ) A .12x x +=B .227x y +=C .231x =D .4xy =2.将方程2610x x +-=配方后,所得到的结果正确的是( ) A .2(3)10x +=B .2(3)9x +=C .2(3)9x -=D .2(3)10x -= 3.下列方程中,有实数根的是( ).A .220x += B .24410x x --=C .23440x x ++=D .24520x x -+=4.下列四组线段中,成比例线段的是( ) A .4cm,1cm,3cm,8cm B .3cm,4cm,5cm,6cm C .4cm,8cm,3cm,5cmD .15cm,5cm,6cm,2cm5.如图,每个小正方形边长均为1,则下列图中的三角形(阴影部分)与图中ABC 相似的是( )A .B .C .D .6.在△ABC 中,△BAC =90°,AD △BC ,垂足为D ,AD =3,BD =2,则CD 的长为( )A .2B .3C .43D .927.在同一时刻,身高1.70米的小强在阳光下的影长为0.85米,一棵大树的高为5.8米,则树的影长为( ) A .10.6米B .2.9米C .11.6米D .5.8米8.若(0)n n ≠是关于x 的方程220x mx n ++=的根,则m n +的值为( ) A .1B .4C .2-D .4-9.学校要组织足球比赛,赛制为单循环形式(每两队之间比赛一场),计划安排15场比赛,应邀请多少个球队参赛?设应邀请x 个球队参赛,根据题意,下面所列方程正确的是( ) A .215x =B .21152x =C .1x(x 1)152-=D .(1)15x x -=10.如图,DE//BC ,下列比例式成立的是( )A .AD ACAB AE= B .DE DABC AB= C .EA DAAB AC= D .DA AEAB AC= 11.为迎接端午促销活动,合肥百大银座从6月份开始对春装进行“折上折”(两次打折数相同)优惠活动.已知一件原价1000元的春装,优惠后实际仅需490元,设该店春装原本打x 折,则有( ).A .()490121000x -=B .()210001490x -=C .2100049010x ⎛⎫= ⎪⎝⎭D .21000149010x ⎛⎫-= ⎪⎝⎭12.已知0a b c ++≠,且a b b c a cp c a b+++===,则直线y px p =+不经过( ) A .第一象限B .第二象限C .第三象限D .第四象限13.如图,△ABC 中,D 是AB 边上一点,△ACD =△B ,AD =2,AC =4,△ADC 的面积为2,则△BCD 的面积为( )A.2B.4C.6D.814.如图,在Rt△ABC中,△C=90°,△A=30°,BC=3,按图中虚线剪下的三角形与△ABC不相似的是()A.B.C.D.15.下列命题正确的是()A.位似图形一定是相似图形B.任意两个菱形一定相似CD.23、24、25能作为直角三角形的三边长16.如图,花丛中有一路灯杆AB.在灯光下,小明在D点处的影长DE=3米,沿BD 方向行走到达G点,DG=5米,这时小明的影长GH=5米.如果小明的身高为1.7米,则路灯杆AB的高度(精确到1米)为()A.5米B.6米C.7米D.8米二、填空题17.一元二次方程2410-+=的一次项系数是______.x x18.在平面直角坐标系中,A(3,﹣3),B(1,0),C(3,0),点P在y轴的正半轴上运动,若以点O、B、P为顶点的三角形与三角形ABC相似,则点P的坐标为____.19.如果2x =3y ,那么x yy+=___. 20.如图,已知△1=△2,添加条件____后,使△ABC △△ADE .三、解答题 21.解下列一元二次方程 (1)2410x x -+=; (2)22330x x +-=; (3)2341x x -=; (4)()()223223y y -=-.22.如图,O 为坐标原点,B ,C 两点坐标分别为()3,1-,()2,1.(1)以O 为位似中心在y 轴左侧将OBC 放大两倍,并画出图形; (2)分别写出B ,C 两点的对应点B ',C '的坐标;(3)已知(),M x y 为OBC 内部一点,写出M 的对应点M '的坐标. 23.如图,在ABC 中,D ,E 分别是边AB ,AC 上的点,连接DE ,且ADE ACB ∠=∠.(1)求证:ADE ACB ∽;(2)如果E 是AC 的中点,8AD =,10AB =,求AE 的长. 24.已知关于x 的方程2220x x m ++-=.(1)当该方程的一个根为0时,求m 的值及方程的另一根;(2)若该方程有两个不相等的实数根,求符合条件的正整数m 的值.25.李师傅要利用家里的一面墙用铁丝网围成一个矩形苗圃,围墙的长为35米,铁丝网总长是70米.如图所示,苗圃的面积能否达到600平方米?如果能,求出矩形苗圃的长和宽;如果不能,请说明理由.26.如图所示,在平行四边形ABCD 中,△A =90°,AB =6cm ,BC =12cm ,点E 由点A 出发沿AB 方向向点B 匀速移动,速度为1cm /s ,点F 由点B 出发沿BC 方向向点C 匀速移动,速度为2cm /s ,如果动点E ,F 同时从A ,B 两点出发,连接EF ,若设运动时间为t s ,解答下列问题:(1)当t 为多少时,△BEF 为等腰直角三角形;(2)是否存在某一时刻t ,使△EFB △△FDC ?若存在,求出t 的值;若不存在,请说明理由.参考答案:1.C【解析】【分析】根据一元二次方程的定义进行判断即可.【详解】解:A、12+=,不是一元二次方程;故A错误;xxB、227+=,不是一元二次方程;故B错误;x yC、231x=,是一次二次方程,故C正确;xy=,不是一元二次方程;故D错误;D、4故选:C.【点睛】本题考查了一元二次方程的概念.只有一个未知数且未知数最高次数为2的整式方程叫做一元二次方程,一般形式是ax2+bx+c=0(且a≠0).2.A【解析】【分析】先移项,再在方程的两边都加上9,进行配方,从而可得答案.【详解】解:2610+-=x x移项得:261+=x x配方得:26910++=x x()2310.∴+=x故选:.A【点睛】本题考查的是利用配方法解一元二次方程,掌握配方法的步骤与方法是解题的关键.3.B【解析】【分析】分别计算出每个方程根的判别式的值,再进一步判断即可. 【详解】解:A .此选项方程根的判别式△=02﹣4×1×2=﹣8<0,此方程没有实数根;B .此选项方程根的判别式△=(﹣4)2﹣4×4×(﹣1)=32>0,此方程有两个不相等的实数根;C .此选项方程根的判别式△=42﹣4×3×4=﹣32<0,此方程没有实数根;D .此选项方程根的判别式△=(﹣5)2﹣4×4×2=﹣7<0,此方程没有实数根; 故选B . 【点睛】本题主要考查根的判别式,一元二次方程ax 2+bx +c =0(a ≠0)的根与△=b 2-4ac 有如下关系:△当△>0时,方程有两个不相等的两个实数根;△当△=0时,方程有两个相等的两个实数根;△当△<0时,方程无实数根. 4.D 【解析】 【分析】根据成比例线段的定义,逐项分析判断即可,成比例线段,如果两个数的比值与另两个数的比值相等,即::a b c d =,则a b c d ,,,为成比例线段. 【详解】A.4:13:8≠,故该选项不符合题意;B.3:44:5≠ ,故该选项不符合题意;C.3:83:5≠ ,故该选项不符合题意;D.15:5=6:2 ,故该选项符合题意; 故选D 【点睛】本题考查了成比例线段的定义,理解成比例线段的定义是解题的关键. 5.B 【解析】 【分析】根据网格的特点求出三角形的三边,再根据相似三角形的判定定理即可求解. 【详解】解:由题意得:AB =AC 2BC =、A,1,与△ABC 的三边对应边不成比例关系,不符合题意;B1△对应边成比例,符合题意;C3△ABC 的三边对应边不成比例关系,不符合题意;D,2,与△ABC 的三边对应边不成比例关系,不符合题意; 故选B . 【点晴】此题主要考查相似三角形的判定和勾股定理,解题的关键是熟知相似三角形的判定定理. 6.D 【解析】 【分析】先证明△BDA △△ADC ,然后再根据相似三角形的性质列出比例式,最后代入已知数据计算即可. 【详解】解:△△BAC =90°, △△BAD +△CAD =90°, △AD △BC , △△C +△CAD =90°, △△C =△BAD , △△BDA =△ADC =90°, △△BDA △△ADC , △BD AD AD DC =,即233DC =,解得:DC =92.故选:D .【点睛】本题主要考查了相似三角形的判定与性质,根据已知条件证得△BDA △△ADC 是解答本题的关键. 7.B 【解析】 【分析】在同一时刻物高和影长成正比,即在同一时刻的两个物体,影子,经过物体顶部的太阳光线三者构成的两个直角三角形相似,利用相似三角形的相似比,列出方程求解即可. 【详解】解:设树的影为x 米,△小强的身高:树的高度=小强的影长:树的影长, △1.700.855.8x= , 解得:x =2.9,即这棵树的高度为2.9米, 故选:B . 【点睛】本题考查了相似三角形在测量高度时的应用,解题的关键是找出相似的三角形,然后根据对应边成比例,列出方程,建立适当的数学模型来解决问题. 8.C 【解析】 【分析】把x n =代入方程得出220n mn n ++=,方程两边都除以n 得出20m n ++=,求出即可. 【详解】解:(0)n n ≠是关于x 的方程220x mx n ++=的根, 代入得:220n mn n ++=,0n ≠,∴方程两边都除以n 得:20n m ++=,2m n ∴+=-.故选:C .本题考查了一元二次方程的解的应用,能运用巧妙的方法求出m n +的值是解此题的关键. 9.C【解析】【分析】赛制为单循环形式(每两队之间都赛一场),x 个球队比赛总场数=()12x x -,即可列方程. 【详解】解:设应邀请x 个球队,每个球队都要赛()1x -场,但两队之间只有一场比赛,由题意得()11152x x -=. 故选:C .【点睛】本题考查了由实际问题抽象出一元二次方程,解决本题的关键是读懂题意,得到总场数的等量关系.10.C【解析】【分析】由DE△BC ,可得△ADE△△ACB ,根据三角形相似的性质得到EA DA AB AC=,因此可判断C 正确.【详解】解:△DE△BC ,△△D =△C ,△E =△B ,△△ADE△△ACB , △DA AE DE AC AB BC ==, 故选C .【点睛】本题考查了相似三角形的判定与性质,解题的关键是根据三角形相似的性质得到比例式再判断选项的正误.11.C【分析】根据原价及经过两次打折后的价格,可得出关于x 的一元二次方程,此题得解.【详解】解: 依题意得:2490100010x ⎛⎫⨯ ⎪⎝=⎭, 故选C .【点睛】本题考查了由实际问题抽象出一元二次方程,找准等量关系,正确列出一元二次方程是解题的关键.12.D【解析】【分析】根据比例的等比性质计算即可得出p 的值,从而确定直线y =px +p 经过象限.本题注意条件的限制.【详解】解:△a +b +c ≠0,根据等比性质,得p =2222c a b c a b ++=++, △直线y =px +p ,即直线y =2x +2,△直线y =px +p 不经过第四象限.故选D .【点睛】 本题主要考查了等比性质:若...a c m k b d n ===,则......a c m k b d n +++=+++ (b +d +…+n ≠0).特别注意条件的限制(分母是否为0),解决本题的关键是要熟练掌握等比的性质.13.C【解析】【分析】根据△ACD =△B ,△A =△A 得出△ACD△△ABC ,再根据相似三角形的面积比是相似比的平方得出面积比,从而进一步求解即可【详解】解:△△ACD=△B,△A=△A,△△ACD△△ABC,△214ACDABCS ADS AC∆∆⎛⎫==⎪⎝⎭,△S△ACD=2,△S△ABC=8,△S△BCD=S△ABC﹣S△ACD=8﹣2=6.故选C.【点睛】本题考查了相似三角形的性质,熟练掌握相关性质是解题关键14.D【解析】【分析】由相似三角形的判定依次判断可求解.【详解】解:A、由两角对应相等,两三角形相似,可证图中虚线剪下的三角形与△ABC相似,故选项A不符合题意;B、由两组对边对应成比例且夹角相等,两三角形相似,可证图中虚线剪下的三角形与△ABC相似,故选项B不符合题意;C、由两角对应相等,两三角形相似,可证图中虚线剪下的三角形与△ABC相似,故选项C 不符合题意;D、无法证明图中虚线剪下的三角形与△ABC相似,故选项D符合题意;故选:D.【点睛】本题考查了相似三角形的判定,直角三角形的性质,掌握相似三角形的判定方法是本题的关键.15.A【解析】【分析】根据位似图形,相似图形的定义可判断A、B,根据平方根的定义和勾股定理的逆定理,可判断C、D.【详解】解:A. 位似图形一定是相似图形,故原命题正确,符合题意;B. 任意两个菱形不一定相似,故原命题错误,不符合题意;C.±D. 23、24、25不能作为直角三角形的三边长,故原命题错误,不符合题意,故选A.【点睛】本题主要考查位似图形,相似图形,平方根和勾股定理的逆定理,熟练掌握上述定义和定理,是解题的关键.16.B【解析】【分析】由CD△AB及FG△AB,分别得△EDC△△EBA及△HGF△△HBA,根据相似三角形的性质得关于AB、BD的方程组,解得BD,AB即可.【详解】△DC△AB,△△EDC△△EBA,△CDAB=EDBE,即1.7AB=33BD+△,△FG△AB,△△HGF△△HBA,△HGHB=FGAB,即1.7AB=555BD++△,△﹣△得33BD+=555BD++,解得BD=7.5,△1.7AB=337.5+,△AB=5.95≈6(米).即路灯杆AB的高度(精确到1米)为6m.故选:B.【点睛】本题考查了相似三角形的判定与性质、方程组的解法,关键是相似三角形的性质得到关于AB 、BD 的方程组.17.-4【解析】【分析】在一元二次方程的一般形式:20(0)ax bx c a ++=≠中,a 是二次项系数,b 是一次项系数,c 是常数项,由此求解即可.【详解】解:一元二次方程x 2-4x +1=0一次项系数是:-4.故答案为:-4.【点睛】此题考查了一元二次方程的一般形式,准确掌握一般式中的相关概念是解题的关键.18.(0,23)或(0,32). 【解析】【分析】利用点A 、B 、C 的坐标特征得到△ACB =90°,CB =2,CA =3,设P 点坐标为(0,t ),由△POB =△ACB ,推出当OP OB BC CA =时,△OPB △△CBA ,即123t =;当OP OB CA CB =时,△OPB △△CAB ,即132t =,分别求出t 的值,从而得到点P 的坐标. 【详解】△B (1,0)、A (3,﹣3)、C (3,0),△△ACB =90°,CB =2,CA =3,设P 点坐标为(0,t ),△当OP OBBC CA=时,△OPB△△CBA,即123t=,解得t=±23,此时P点坐标为(0,23),当OP OBCA CB=时,△OPB△△CAB,即132t=,解得t=±32,此时P点坐标为(0,32),综上所述,若以O、B、P为顶点的三角形与△ABC相似,则点P的坐标为(0,23)或(0,32).故答案为(0,23)或(0,32).【点睛】本题考查了相似三角形的判定,根据比例线段列出方程是解题的关键.19.5 2【解析】【分析】直接利用已知得出x=32y,进而代入得出答案.【详解】解:△2x=3y,△x=32 y,△3522y yx yy y++==.故答案为:52.【点睛】本题主要考查了比例的性质,正确将已知变形是解题关键.20.△B=△D【解析】【分析】先证出△BAC=△DAE,再由△B=△D,即可得出ABC△△ADE.【详解】解:添加条件△B=△D后,△ABC△△ADE.理由如下:△△1=△2,即△BAC =△DAE ,又△△B =△D ,△ABC △△ADE .故答案为:△B =△D .【点睛】本题考查了相似三角形的判定方法;熟练掌握三角形相似的判定方法,并能进行推理论证是解决问题的关键.21.(1)12x =22x =;(2)1x 2x =(3)1x =2x =;(4)11y =-,21y = 【解析】【分析】(1)利用配方法解一元二次方程即可;(2)利用公式法解一元二次方程即可;(3)利用公式法解一元二次方程即可;(4)利用因式分解法解一元二次方程即可.【详解】解:(1)△2410x x -+=,△241x x -=-,△2443x x -+=,△()223x -=,△2x -=△2=x解得12x =22x =(2)△22330x x +-=,△2a =,3b =,3c =-,△()22=43423330b ac ∆-=-⨯⨯-=>,△x ==,解得1x =2x = (3)△2341x x -=,△23410x x --=,△3a =,4b =-,1c =-,△()()22=44431280b ac ∆-=--⨯⨯-=>,△x ===解得1x =2x = (4)△()()223223y y -=-,△()()2232230y y ---=,△()()322332230y y y y -+---+=,即()()5510y y -+=,解得11y =-,21y =.【点睛】本题主要考查了解一元二次方程,解题的关键在于能够熟练掌握解一元二次方程的方法. 22.(1)画图见解析;(2)点B '的坐标为(-6,2),点C '的坐标为(-4,-2);(3)点M '的坐标为(-2x ,-2y )【解析】【分析】(1)利用位似变换的性质分别作出B 、C 的对应点B ',C ',然后顺次连接O ,B ',C '即可;(2)根据(1)中所作图形即可得到B ',C '两点的坐标;(3)根据位似图形上对应点的坐标的横纵坐标对应比相同进行求解即可.【详解】解:(1)如图所示,OB C ''△即为所求;(2)如图所示,点B'的坐标为(-6,2),点C'的坐标为(-4,-2);(3)△OB C''△是△OBC以O为位似中心,位似比为2的对应图形,点M(x,y)为△OBC内部一点,△点M的对应点M'的坐标为(-2x,-2y).【点睛】本题主要考查了画位似图形和求位似图形上的对应点的坐标,解题的关键在于能够熟练掌握位似图形的相关知识.23.(1)见解析;(2)【解析】【分析】(1)根据两角对应相等两个三角形相似即可得证.(2)根据点E 是AC 的中点,设AE =x ,根据相似三角形的性质可知AD AE AC AB=,从而列出方程解出x 的值.【详解】解:(1)ADE ACB ∠=∠,A A ∠=∠ADE ACB ∴∆∆; (2)由(1)知ADE ACB ∆∆,AD AE AC AB∴= △点E 是AC 的中点,设AE x =,22AC AE x ∴==8AD =,10AB =8210x x ∴=解得1x =2x =-不合题意舍去).AE ∴=【点睛】本题考查相似三角形的判定和性质,解题的关键是熟练掌握基本知识,学会利用参数构建方程解决问题.24.(1)m 值为2,另一个根为2-;(2)正整数m 的值为1或2【解析】【分析】(1)先将0x =代入原方程求出2m =,进而解方程即可得出答案;(2)根据方程有两个不相等实数根结合根的判别式即可得出关于m 的一元一次不等式,解不等式即可得出m 的取值范围,则可得出答案.【详解】解:(1)当0x =时,0020m ++-=,2m ∴=,220x x ∴+=,0x ∴=或2x =-,即方程的另一根是2-;(2)关于x 的方程2220x x m ++-=有两个不相等的实数根,∴△224(2)4120m m =--=-+>,3m ∴<, m 为正整数,1m ∴=,2.【点睛】本题主要考查了一元二次方程的解法以及根的判别式,解答本题的关键是熟练掌握根的判别式的意义以及用因式分解法解一元二次方程的知识.25.苗圃的面积能否达到600平方米,此时矩形的长为30米,宽为20米【解析】【分析】设AB =CD =x 米,则BC =(70-2x )米,然后根据矩形面积公式列出方程求解即可.【详解】解:设AB =CD =x 米,则BC =(70-2x )米,△()=702600ABCD S AB BC x x ⋅=-=矩形,△2353000x x -+=,解得15x =或20x ,当15x =时,70240m 35m BC x =-=>,不符合题意,△20x ,△70230x -=△苗圃的面积能否达到600平方米,此时矩形的长为30米,宽为20米.【点睛】本题主要考查了一元二次方程的应用,解题的关键在于能够根据题意列出方程求解.26.(1)当t=2时,△BEF为等腰直角三角形;(2)存在,当t=32时,△EFB△△FDC【解析】【分析】(1)由已知条件易证四边形ABCD是矩形,所以△A=△B=△C=90°,若△BEF为等腰直角三角形,则BE=BF,进而可求出t的值;(2)若△EFB△△FDC,则BE BFCF CD=,结合题目的已知条件可得到关于t的方程,解方程即可得知是否存在t的值.【详解】解:(1)△四边形ABCD是平行四边形,△A=90°,△四边形ABCD为矩形,△△A=△B=△C=90°,当△BEF为等腰直角三角形时,只能是BE=BF,AE=t,则BE=AB-AE=6-t,BF=2t,△2t=6-t,解得:t=2,△当t=2时,△BEF为等腰直角三角形.(2)存在△△EFB△△FDC,△BE BF CF CD=△BE=6-t,BF=2t,CF=12-2t,即62 1226t tt-=-,解得:t=32或t=6,又△t=6时,B与E重合,所以不符合,舍去,综上所述,当t=32时,△EFB△△FDC.【点睛】本题考查了相似三角形的判定及性质、矩形的判定及性质,熟练掌握性质定理是解题的关键.。
河北省石家庄市第二十三中学2024-2025学年九年级上学期10月学业水平检测物理试题
河北省石家庄市第二十三中学2024-2025学年九年级上学期10月学业水平检测物理试题一、单选题1.下列现象中,说明分子在永不停息运动的是( )A .扫地时灰尘到处乱飞B .酒精擦到皮肤上,能闻到酒精味C .秋风起后,树叶纷纷落下D .下雪时,雪花飘飘2.关于温度、内能、热量,下列说法正确的是( )A .温度相等的物体,内能一定相等B .物体内能增加,一定是因为吸收了热量C .物体的温度升高,内能会增加D .物体吸收了热量,温度一定升高 3.用两个相同的电加热器给质量都为1kg 的物质A 和B 加热,它们的温度随时间的变化关系如图所示,已知()3A 4.210J/kg c =⨯⋅℃,据此判断5min 物质B 吸收的热量为( )A .44.210J ⨯B .48.410J ⨯C .51.2610J ⨯D .条件不足,无法计算 4.如图所示是小强在家烧开水时壶盖被顶起的场景,汽油机的四个冲程中,与其能量转化相同的是( )A .吸气冲程B .压缩冲程C .做功冲程D .排气冲程 5.关于热机,下列说法正确的是( )A.柴油机的效率约为40%B.一般情况下汽油机的功率比柴油机大C.效率高的热机做的有用功多D.所用燃料较少的热机效率高6.我国科技人员历时13年自主研制的F级50兆瓦重型燃气轮机正式完工。
燃气轮机的本质是一种通过燃料(主要为天然气)与空气燃烧产生高温高压气体,推动叶片带动发电机来发电的机械。
联合循环一小时获得11⨯的电能,消耗332.5210J⨯的天然气(天然气的6.310m热值取73810J/m⨯)。
下列有关说法正确的是()A.燃料燃烧是化学能转化为机械能B.发电机是由电能转化为机械能C.联合循环的热效率约为20%D.燃气轮机联合循环一小时天然气共释放出11⨯的热量5.0410J7.如图所示,用丝绸摩擦过的玻璃棒去靠近轻质小球时,产生了互相吸引的现象.下列说法正确的是()A.玻璃棒带负电B.小球一定带负电C.小球可能带正电D.小球可能不带电8.很多家庭安装了如图所示的太阳能家用庭院灯。
河北省石家庄市第二十三中学2024-2025学年九年级上学期期中考试数学试卷
河北省石家庄市第二十三中学2024-2025学年九年级上学期期中考试数学试卷一、单选题1.没有哪一门学科能像数学这样,利用如此多的符号展现一系列完备且完美的世界.下面是由4个数学式子绘制成的完美曲线,其中是中心对称图形的是()A .笛卡尔心形线B .三叶玫瑰曲线C .蝴蝶形曲线D .太极曲线2.已知点(),A a b 与点()2,3B -是关于原点O 的对称点,则()A .()2,3A -B .()2,3A -C .()2,3AD .()2,3D --3.半径为5的四个圆按如图所示位置摆放,若其中有一个圆的圆心到直线l 的距离为4,则这个圆可以是()A .⊙O 1B .⊙O 2C .⊙O 3D .⊙O 44.如图所示的正六边形花环绕中必至少旋转α度能与自身重合,则α为()A .30B .60C .120D .1805.如图,在O 中,弦AB 的长为8,圆心O 到AB 的距离4OE =,则O 的半径长为()A .4B .C .5D .6.某畅销书的售价为每本20元,每星期可卖出300本,书城准备开展“读书节活动”,决定降价促销.经调研,如果调整书籍的售价,每降价1元,每星期可多卖出20本.设每本降价x 元后,每星期售出此畅销书的总销售额为y 元,则y 与x 之间的函数表达式为()A .()()2030010y x x =-+B .()()2030020y x x =-+C .()()20230010y x x =-+D .()()20230020y x x =-+7.如图,四边形ABCD 为O 的内接四边形,116BCD ∠=︒,则BOD ∠的大小是()A .108°B .128︒C .148︒D .64︒8.如图,用一段长为30米的篱笆围成一个一边靠墙(墙的长度不限)的矩形菜园ABCD ,设AB 边长为x 米,BC 的长y 米,菜园的面积为S (单位:平方米).当x 在一定范围内变化时,y 和S 都随x 的变化而变化,则y 与x ,S 与x 满足的函数关系分别是()A .二次函数关系,一次函数关系B .正比例函数关系,二次函数关系C .二次函数关系,正比例函数关系D .一次函数关系,二次函数关系9.如图是一个钟表表盘,连接整点2时与整点10时的B ,D 两点并延长,交过整点8时的切线于点P PC 为()A .3B .2C .D .10.某段公路上汽车紧急刹车后前行的距离s (单位:m )关于行驶时间t (单位:s )的函数解析式是2305s t t =-,遇到刹车时,汽车从刹车后到停下来前进了()m .A .45mB .30mC .6mD .3m11.风力发电是一种常见的绿色环保发电形式,它能够使大自然的资源得到更好地利用.如图1,风力发电机有三个底端重合、两两成120︒角的叶片,以三个叶片的重合点为原点水平方向为x 轴建立平面直角坐标系(如图2所示),已知开始时其中一个叶片的外端点的坐标为()5,5A ,在一段时间内,叶片每秒绕原点O 顺时针转动90︒,则第2024秒时,点A 的对应点2024A 的坐标为()A .()5,5B .()5,5-C .()5,5--D .()5,5-12.如图,已知点O 是ABC V 的外心,连接OA OB OC ,,,若140∠=︒,则BAC ∠的度数为()A .20︒B .30︒C .40︒D .50︒13.如图,四边形ABCD 内接于O ,AC 是O 的直径.若ACD DBC ∠=∠,CD =3AB =,则BC 的长为()A .3B .52C .5D .414.小明以二次函数246y x x =-+的图象为模型设计了一款杯子,如图为杯子的设计稿,若4AB =,2DE =,则杯子的高CE 为()A .4B .5C .6D .715.有一题目:“,PA PB 分别切O 于,A B 两点,点C 为O 上不同于,A B 的任意一点,若40P ∠=︒,求ACB ∠.”嘉嘉的解答是:“如图,取O 上一点C ,连接,,,CA CB OA OB ,得360290140AOB P ∠=︒-∠-⨯︒=︒,所以1702ACB AOB ∠=∠=︒.”而淇淇说:“嘉嘉考虑的不周全,ACB ∠还应有另一个不同的值.”下列判断正确的是()A .淇淇说的对,且ACB ∠的另一个值是110︒B .淇淇说的不对,ACB ∠就得70︒C .嘉嘉求的结果不对,ACB ∠应得60︒D .两人都不对,ACB ∠应有3个不同值16.已知ABC V 是边长为3的等边三角形,A 的半径为1,D 是BC 上一动点,DM ,DN 分别切A 于点M ,N ,A 的另一条切线交DM ,DN 于点E ,F ,则DEF 周长l 的取值范围是()A .4l ≤≤B l ≤≤C .6l ≤≤D .l ≤≤二、填空题17.如图,在平面直角坐标系中,()()0,4,2,0A B -,线段BC 是由线段BA 绕点B 逆时针旋转90︒而得到的,则点C 的坐标是.18.某拱桥的主桥拱近似地看作抛物线,桥拱在水面的跨度OA 约为20米,若按如图所示方式建立平面直角坐标系,则主桥拱所在抛物线可以表示为2(10)10y a x =-+,则a =,主桥拱最高点P 与其在水中倒影点P '之间的距离为米.19.如图,半圆O 的直径4AB =,以长为2的弦PQ 为直径,向点O 方向作半圆M ,其中P 点在弧AQ 上且不与A 点重合,但Q 点可与B 点重合.①发现:POQ ∠为定值,POQ ∠=;②思考:点M 与AB 的最大距离为,点M 与AB 的最小距离为.三、解答题20.如图,ABC V 中,42AB AC BAC =∠=︒,,D 为ABC V 内一点,连接AD ,将AD 绕点A 逆时针旋转42︒,得到AE ,连接DE BD CE ,,.(1)求证:BD CE =;(2)若DE AC ⊥,求BAD ∠的度数.21.如图,以40m/s 的速度将小球沿与地面成30o 角的方向击出时,小球的飞行路线是一条抛物线.如果不考虑空气阻力,小球的飞行高度h (单位:m )与飞行时间t (单位:s )之间具有函数关系2205h t t =-.(1)求小球飞行3s 时的高度;(2)小球的飞行高度能否达到20m ?请说明理由.22.每个小方格都是边长为1个单位长度的正方形,在建立平面直角坐标系后,ABC 的顶点均在格点上.(1)以原点O 为对称中心,在图中画出ABC 关于原点O 对称的111A B C ;(2)请画出ABC 绕C 点顺时针旋转90°的22A B C ;(3)22A B C 可以通过旋转得到111A B C ,写出旋转中心坐标_____.23.如图,BD 是O 的直径,A 是BD 延长线上的一点,点E 在O 上,BC AE ⊥,交AE的延长线于点C ,BC 交O 于点F ,且点E 是 DF 的中点.(1)求证:AC 是O 的切线;(2)若5AD =,AE =O 的半径.24.“筒车”是一种以水流作动力,取水灌田的工具,据史料记载,它发明于隋而盛于唐,距今已有1000多年的历史,是我国古代劳动人民的一项伟大创造.如图,“筒车”盛水筒的运行轨迹是以轴心O 为圆心的圆,已知圆心O 在水面上方,且当圆被水面截得的弦AB 为6米时,水面下盛水筒的最大深度为1米(即水面下方圆上部分一点距离水面的最大距离).(1)求该圆的半径;(2)若水面上涨导致圆被水面截得的弦AB 从原来的6米变为8米时,则水面上涨的高度为多少米?25.【情境探究】小明和小强做弹力球游戏.游戏规则如下:小明抛出弹力球,弹力球落地后弹起再落下,小强在某个位置放置一块接球板,若弹力球在第二次落地前碰到接球板则小强胜(球与接球板触碰),否则小明胜.【数学建模】弹力球两次运动轨迹均可近似看成抛物线,如图所示.一次游戏过程中:小明站在起点O 处抛弹力球,以O 为坐标原点,水平方向直线和竖直方向直线分别为x 轴和y 轴建立平面直角坐标系,弹力球从离地面2米的A 处抛出,第一次落地前,球在距离起点O 水平距离为2m 处,达到飞行最大高度为3.6m ,弹力球在B 处落地后再次弹起,第二次飞行的水平距离=4BC 米,且飞行的最大高度为第一次的一半.【问题解决】(1)求弹力球第一次着地前抛物线的函数表达式;(2)小强在距起点8米处放置接球板EF ,EF 垂直地面于点E ,且=1EF m ,请通过计算判断谁会获胜.26.如图1,OAB △中,10OA OB ==,将扇形POP '按图1摆放,使扇形的半径OP 、OP '分别与OA 、OB 重合,6OP =.如图2,若OAB △不动,让扇形POP '绕点O 逆时针旋转一周,连接线段AP 、BP ',设旋转角为α.发现:直接写出AP 、BP '的数量关系____________.探究:若80AOB ∠=︒(1)扇形POP '绕到点O 的左侧,当OP AB ∥时,旋转角α=_____________︒;(2)扇形POP '绕到点O 的右侧,当AP 与弧PP '相切时,求BP ';(3)若点Q 是弧PP '上任意一点,在扇形POP '绕点O 逆时针转过程中,当AOQ △的面积最大时,求出BOQ ∠的度数。
河北省石家庄市第二十三中学2024--2025学年九年级上学期10月月考化学试卷(无答案)
初三化学测试卷温馨提示:亲爱的同学们:当你拿到这份试卷,一场知识的挑战就此开启。
请你认真审题,冷静作答,相信自己的能力,为这段时间的努力交上一份满意的答卷!第一部分 (选择题24分)一、选择题(每题2分,每道题只有一个正确选项,共24分).1. 地壳里的含量最多的金属元素是 ( )A. 铁B. 铝C. 硅D. 氧2. 人类的日常生活离不开水。
下列关于水的说法错误的是A. 农业上采用喷灌和滴灌技术可以达到节约用水的目的B. 煮沸可以降低水的硬度C. 沉淀、过滤、蒸馏中净化程度最高的方法是过滤D. 明矾可用于净水,是因为它可使水中悬浮杂质较快沉降3. 我国近代化学先驱徐寿创造了部分元素的汉语名称。
下列元素名称与符号不一致的是( )A. 铁 ( Fe)B. 铝(AI)C. 钙( Ca)D. 锰 ( Mn)4. “宏观辨识与微观探析”是化学科核心素养之一,下列事实的微观解释不正确的是( )选项事实解释A好酒不怕巷子深分子在不断地运动B·一滴水中约10²个水分子水分子很小C.注射器中的气体通过压缩体积会变小加压时气体分子变小D一氧化碳和二氧化碳化学性质不同分子构成不同5. 关于过滤的操作中,不正确的是A.滤纸应低于漏斗边缘 8.漏斗里的液体应低于滤纸边缘C.漏斗下端长管口紧靠烧杯内壁D.在滤纸上开一个小口可以使过滤速度更快6. 物质由微观粒子构成。
下列物质由分子构成的是(A. 钢B. 金刚石C. 液氧D. 氯化钠7. 下四位同学描述的化学式可能是:甲:表示一种物质;乙:表示一个分子;钙:表示由两种元素组成;丁:表示一个分子中有三个原子;A . O2 B. MgO C. NO₂ D. NH38.下图中不同小球代表不同原子,其中能表示化合物的是 ( )9.某物质经测定只含有一种元素,则关于该物质说法正确的是 ( )A. 一定是纯净物B. 一定是混合物C. 一定不是化合物D. 一定是一种单质10.“归纳推理”是化学学习过程中常用的思维方法,以下类推结果正确的是(A. 所有分子都是由原子构成的,则所有的分子都比原子大B. 化学变化中分子种类发生改变,分子种类发生改变的变化一定是化学变化C. 离子是带电荷的微粒,所以带电荷的微粒一定是离子D. 同种元素原子的质子数相同,所以质子数相同的粒子一定属于同种元素11.小明同学依据描述书写的化学符号:①两个氮分子:2N₂;②由三个氧原子构成的臭氧分子:30;③粒子结构示意图表示的粒子:S;④两个镁离子:2Mg2+;⑤金属汞:Ag: ⑥氦气: He。
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河北省石家庄市同文中学2020-2021学年九年级上学期11月份英语月考(无听力)(满分100分,听力20分)II.单项选择(共25小题,每小题1分,计25分)21.-- How do you study English so well?--I read English ____for about half an hour every morningA. aboutB. loudC. quietD. slow22. She was afraid to ask question____ her poor pronunciation.A.because ofB. becauseC. insteadD. instead of23.Our English teacher____ us all the time.A. goes on withB.is patient withC. keeps with upD. catches up with24.--____ will your father come back home?--In two weeks.A. HowlongB. How oftenC. How soonD. How many25. The notice says the sports meeting has been____ till next week.A. put onB. put downC.put ofD. put up26.-- Where will we ____ the guests to dinner?--Atthe new restaurant near my home.A.treatB.acceptC. refuseD. repeat27. --Do you know____ to our school?--Next term.A when the exchange students cameB. When did the exchange students comeC. when the exchange students will comeD. When will the exchange students28. –Wouldyoulike some green tea?-No, thanks. I____ drink green tea. It hurts my stomachA. almostB.seldomC. onlyD. still29. --We've beentrying hard, but can't solve the problem.-lthink you can____ it in another way.A. share withB. deal withC. keep up withD. point out with30. As China grows stronger and stronger, Chinese____ in more and more schools out of our country.A. achesB. is taughtC. has taughtD. was taught31. Isaw the thick smoke ____the air then.A. rising intoB. rises intoC. to rise toD. to rise into32.--Good news! I got thelast ticket to the concert--How____ you are!A.activeB.strangeC. luckyD. funny33.The dictionary may____ for three weeks.A. keepB.be keptC. borrowD.be borrowed34.____ you can finish your work ahead of timeA. By the wayB. On awayC. By that wayD.In this way35. Huaweiannounced “The world SG technical standards____ China!"A set upB.put offC. belong toD.take up36. The manager sounded ____ on the phone. He offered to show us around the company.A. softlyC. gentlyD.seriously37. You’d better finish the task by yourself. You can' ____others all the time.A. argue withB. depend onC. separate fromD. belong to38. How kind you are! You always do what you can____ others.A.helpB.helpingC.helpsD. to help39. He____ his father's present and he____ it happily.A. received; acceptedB. accepted; refusedC.received; refusedD. accepted; accepted40. My mother likes going shopping in her____ time.A. busyB.correctC. livelyD.spare41. I didn'taccept his help ____ I wanted to try it myself.A. becauseB. thoughC.untilD. unless42.--There was a basketball match between our class and Class 3 yesterday afternoon. --____. I missed it.A. CertainlyB. I’m sor ry to hear thatC. What funD. What a pity43. The shop____ sells flowers is at the end of the street.A. whoB. whereC.whichD. what44. We can’t live in TV plays. ____,we have to face the real life.A. So farB. As a resultC.After all45. Last time everyone was here ____ Li Jia because he was ill in hospital.A. includingB.besideC.exceptD. besidesIII.完型填空(共10小题,每小题1分,计10分)Sitting on the side of the highway waiting to catch speeding drivers,apolice officer sawa car driving along at 22 miles per hour.He thought to himself, his driver is just as dangerous as a __46__!" So he turned on his lights and pulled he driver over.Getting closer to the car, he noticed that there were __47__ oldladies, two in the front seat and three in the back, wide eyes and pale face.The driver who knows __48__ about what happened, said to him, “Office, I don’t understand, I was doing exactly the speed limit! What seems to be the __49__?""“Ma’am," the officer replied, "you weren't speeding, but you should kn ow that driving __50__than thespeed limit can also be a danger to otherdrivers. The same asaspeeder.""No, sir. I was doing the speed limit -- exactly twenty-twomiles an hour:" The oldwoman saidina __51__ voice. The officer, almost unable to control his chuckle.explained to her that"22" was theroute __52__, not the speed limit.A bit embarrassed, the woman smiled widely and thanked the officer for __53__ hermisunderstanding."But __54__. I let you go. ma'am, i have to ask. Is everyone in this car OK? Thesewomen seem to be __55__ badly and they haven't made asingle sound this whole time,"theofficer asked.46.A. smokerB. riderC.speederD. walker47.A.threeB. fourC. fiveD.six48.A. nothingB.somethingC.everythingD. anything49.A. excuseB.questionC. reasonD.problem40.A. closerB.slowerC. fartherD.higher41.A.sadB.sweetC. proudD. weak52.A. numberB. mapC. guideD.order53.A. laughing atB.leading toC. talking aboutD. pointing out54.A.untilB. beforeC. althoughD.if55. A. cryingB.coughingC. sleepingD.shakingA. MondayB.WednesdayC. FridayD. Sunday57. The Victoria Restaurant is famous forits Sunset Island cooking, adelicious ____ mix.A. Asian & Africann & EuropeanC.African & AustralianD.European Australian58. According to the passage if we go to Rosetown, we can ____.A. find out the history of Sunset IslandB.taste some specials in restaurantsC. enjoy the great sights of the islandD. see some buildings in the 18th century59. Sunset Island Tourist Information Center can help us ____.A get a free mapB. make a ravel planC. find a good hotelD.do some training60. In which partof amagazine can we read this passage?A. ScienceB. CultureC. SportsD. TravelBIn Los Angeles, a waiter served a group of teens. The waiter remembered his experience asayoung high school student.So he made sure the teens bad a pleasant experienceat the restaurant. Thewaiter made sure ofit.After seeing all the teens and doing a great job, he was left a tip(小费),only $3.28.That was hardly enough to buy a drink at Starbucks.The waiter went home. And he felt hatred for the students who did not knowthevalue of hard work Theylooked down on people like him. Or so he thought.After several days, the waiter forgot about it.Hislife went onas usual. But ten days later, he receivedaletter from the teens."About a week and a half ago, on October 7, my three friends and Icameto eatat this restaurantasourown homecoming celebration. It was an exciting experience for usto be herealone, and itwas all newtous. And you were the best waiter we could ask for. You were kind, helpful, and didn't treat us like babies! SoI want to say thankyou for making our 'grown-up'experience so amazing and fun."I would also like to say sorry on behalf of(代表)my group. Since we were new to all of this or 13-year-old minds didn't exactly know how to deal with the bill. The bill was reasonable(合乎情理的)but we had completely forgotten(and didn't know, to be honest what a tip even was, let alone howmuchtogive.Sowe emptied our pockets, and all our money added up to $3.28."Having no idea of how small this really was, we left. Later, we realized our mistake and felt terrible. We knew we had to make it right,“So together with this letter, you will find the correct 18% tip +extra for simply being amazing. Thank you for your help and patience and also thank you for making our night fun Thank you!"61.How did the waiter receive the group of teens?A.He tried io make them pay more.B.He served them like other waiters,C.He-treated them as young children.D.He did his best to make them happy.62.Why did the group of teens leave that small tip?A.Because they looked down on the waiter.B.Because they didn't know what a tip meant.C.Because they weren't pleased with the service.D.Because they thought the tip should be that much63.What made the teens write the letter?A.The tip they left for the waiter.B.The bill the restaurant received.C.The way the waiter served them.D.The fun they had at the restaurant.64. What do restaurant waiters mind most in America?A. What kind of guests they receive.B.What dishes people usually order,C.Whether they are given reasonable tips.D.How much customers pay for their meals.65.What did the group of teens try to say in the letter?A.They were quite thankful forthe waiter's serviceB.They had realized the mistake and made itright.C.They had a wonderful experience at the restaurant.D.They wanted more customers to goto the restaurant.卷II(非选择题,共25分)V.任务型阅读(共5小题,每小题2分,计10分)任务型阅读Using too much water and throwing rubbish into our rivers are clear ways that humans can put our water supply in danger. but we also affect(影响)our water supply in less clear ways. You may wonder howpaving(铺设)a road can lead toless usable fresh water. Most part of the water we use every day is groundwater. Groundwater does not come from lakes or rivers. It comes from underground. The more roads and parking lots we pave, the less water can flow into the ground to become groundwater. So you see human activity indeed affects our water supply.Human activity is not the cause of all water shortage. Drier climate(气候)is of course more likely to make water supply short in lots of areas than in those with more rainfall. In any case. however, good management canhelp to make sure there is enough water to meet our basic needs.The ways we use water every day can make a big difference.too. In the United States, a family of four can use 1.5 tons of water a day! This shows how much we depend on water to live. but there's a lot we can do to lower the number.You can take steps to save water in your home. To star with, use the same glass for your drinking water all day. Wash itonly once a day. Run your dishwasher only when it is full Help your parents fix any leaks(泄露)in your home. You can even help to keep our water supply clean by recycling batteries(电池)instead of throwing them away.You can even help to keep our water supply clean by recycling batteries((电池))instead of throwing them away.66题完成句了;67题简略回答问题;68题用英语表达文中画线单词it所指代的内容;69题找出并写下文章的主题句;70题将文中画线的句子译成汉语。