九年级期中测试数学参考答案一、1.A2.B3.D4.D5.B6.C二、7.x²+2x+3=08.459.x010.4√511.10三、12.解:x =4+2√5,x2=4-2√513.证明：由旋转可知，△ABC△DEC，·A=ZCDE，AC=DC，A=514.解：（1）对称轴为直线x=2(2) - 134=ZBOM，ZEOM=ZFOM，.ZAOM-ZEOM=ZBOM-ZFOM，ZAOC = ZBOD,:. AC = BD16.解：设全班有x名学生，根据题意，得x（x一1）=1640，解得x=一40（舍去）或x=41.答：全班有41名学生.17.解：（1）如图①.点A的坐标为（一3,1).（2）如图②.点A2的坐标为（一2，一4).图①图②118.解:（1)y=-（x-2)²+2.88211（2）在y=--（x一2)²+2.88中，令y=2.16可得，2.16=-(x-2)²+2.88，22解得x=3.2（舍去）或x=0.8，C处距桥墩的距离CE至少为0.8米-a-

DFrom an airplane, cars moving slowly down the highway look like ants. But actualants—unlike cars—somehow manage to avoid the suffering of stop-and-go traffic.Researchers are now studying these insccts’ cooperative tactics (战术) to learn how toprogram self-driving cars that don't jam up.The free flow of traffic becomes unstable as the number of cars increases on a highway.At 15 vehicles per mile per lane, one driver tapping their brakes (刹车) can cause aliquid to a solid form, says Nishinari, a physicist at the University of Tokyo.numbers. So what's their secret? In a recent study, researchers recorded ants on trails andjam because they travel in groups of three to 20 that move at nearly constant rates whilekeeping good distances between one another-—and they don't speed up to pass others.Human drivers at rush hour are hard to follow such rules. “"We're maximizing theinterests of individuals, which is why, at a given point, you start to have a traffic jam,” saysNicola, who studies sustainable engineering at the University of Trento in Italy. “Butself-driving cars, if they one day.become everywhere, could have more cooperative programming. In one vision of this future, autonomous vehicles would share informationand headways or by not passing others on the road," Nicola suggests.Today's drivers can learn at least one thing from ants to avoid causing a traffic jam,Nishinari says: don't tailgate. By leaving room between their car and the one ahead of them,drivers can absorb a wave of braking in heavy traffic conditions that would otherwise beamplified (放大) into a traffic jam with no obvious cause. “Just keeping away,"” he says,"can help traffic flow smoothly."32. What is paragraph 2 mainly about?A. The principle of causing a jam.B. The bad effects of jams on our life.C. The difficulty of avoiding a jam.D. The suffering of being stuck in a jam33. What is the ants' key to avoiding traffic jams?A. Traveling in large groups.B. Keeping steady speed and spacing.C. Following a central leader.D. Frequently walk over one another. 34. What does Nicola suggest in Paragraph 4?A. Provide more speed choices for drivers. B. Build special roads for self-driving cars.C. Set stricter rules to regulate drivers' behaviors.D. Apply ants’ cooperative strategies to self-driving cars.英语试题第7页共12页夸克扫描王极速扫描，就是高效品

听第7段材料，回答第8至10题。绝密★启用前8.Why does the man worry about Lily?四川省2026届高三第一次教学质量联合测评BHer sleep has been affected英语试卷C.Her dinner time has been changed试卷共8页，67小题，满分150分。考试用时120分钟。A.Limiting the time spent on dinner.注意事项：B.Charging the phone outside Lily's room.1.考查范围：必修第一册~选择性必修第四册Unit3。C.Letting Lily keep the phone during study2.答卷前，考生务必将自己的姓名、准考证号等填写在答题卡指定位置上。3.回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑。如需改A.Favorable.动，用橡皮擦干净后，再选涂其他答案标号。回答非选择题时，将答案写在答题卡上。写在本试卷听第8段材料，回答第11至13题。B.Uncertain.C.Resistant.上无效。11.What does Li Lei say about learning calligraphy?4.考生必须保持答题卡的整洁。考试结束后，请将答题卡交回。A.It needs special writing brush.B.It requires consistent practice.第一部分听力（共两节，满分30分）C.It is mainly for professional artists.做题时，先将答案标在试卷上，录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到12.How did the woman find the taste of zongzi？答题卡上。A.Strange.第一节（共5小题；每小题1.5分，满分7.5分）B.Salty.C.Tasty.13.What are the speakers mainly talking about?听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小AChinese traditional festivals.题。每段对话仅读一遍。B.The beauty of Chinese culture.例：How much is the shirt？C.Suggestions for tasting Chinese food.A.19.15.B.9.18.C.9.15.听第9段材料，回答第14至17题。14. How long has Mark worked as a potter?答案是C。1.Howwill the speakersgo to the library2DA.For 4years.B.For14years.For 40years.A.By taxi.B.By bus.C.By subway.15.Why did Mark decide to do pottery?A2.What is included in the fee?A.He was eager to realize his dream.A.Lunch.B.Swimsuit.C.Sport shoes.B.He was attracted by a pot exhibition.3.What does the man suggest?CHe had to support his company operation.A.Letting noisy students out.B.Extending the lunch period.C.Asking students to be quieter.16.What was Mark's problem when going back to school?A 4.What's the probable relationship between the speakers？A.Lacking enthusiasmB.Handling physical challenges. C.Fitting in with young students.A.Waiter and customerB.Chef and food critic.C.Buyer and salesman.17.Where does the conversation probably take place?@5.What is the result of the match？A.In a studio.B.In a company.C.In a school.NA.2:0.B.4:2.C.4:4.听第10段材料，回答第18至20题。第二节（共15小题；每小题1.5分，满分22.5分）18.When did the speaker run 8.6 km?听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选A.Today.-B.Yesterday.C.Two days ago.出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题19.What did the speaker realize after the recent run？5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。A.She should focus on how she felt.听第6段材料，回答第6、7题。B.She improved her running speed.6.What does the woman want to grow?C.Cabbage.C.She needed to set a new running goalACherry tomatoes.B.Carrots20. What is the meaning of doing exercise?B.To go beyond oneselfC.To build confidence.B.Eat more vegetables.C.Involve in the gardeningA.To record health data.A.Make some tools.四川·高三英语第2页（共8页）四川·高三英语第1页（共8页）

1、河北省2024-2025学年第一学期九年级教学质量检测二政治试题1、河南省2024-2025学年第一学期七年级学情分析二地理试题1、河北省2024-2025学年第一学期七年级教学质量检测二地理试题1、河2、定边四中2024~2025学年第一学期高二期中考试[25-T-260B]地理试题1、2024-2025学年阜阳三中高二年级第一学期第一次调研考试[ZH240941B]地理试题1、安徽省蒙城县2024-2025第一学期九年级第一次学业质量检测语文试3、超级全能生·名校交流2025届高三第二次联考(5079C)地理答案1、超级全能生·名校交流2025届高三第二次联考(5079C)地理答案1、超级全能生·名校交流2025届高三第二次联考(5079C)地理答案

7如图4.所示，物块P、Q由通过定滑轮且不可伸长的轻绳连接，初始时刻，物块P.静止在粗糙水面上的A点，此时滑轮左侧轻绳沿竖直方向，现给物块P一水向左的初速度。已知物块P经过B点时速度大小为，且连接P的轻绳与水方向的夹角为45°，此后物块P继续运动到最远处C点。K45°则物块P从A点到C点的整个过程P!IP7C8A.物块P、Q组成的系统机械能守恒B.绳子拉力始终大于物块Q的重力C.物块Q的机械能增大图4D.物块P经过B点时，物块Q的速率为√2v8.如图5所示，光滑的水地面上有一辆装有竖直挡板的小车，被压缩的弹簧一端与挡板连接，另一端与一质量为8kg的物块A连接，弹簧的弹力为5N时，物块A处于静止状态，若小车以1m/s²的加速度向左加速运动，则A.物块A与小车相对静止B.物块A与小车相对滑动C.物块A所受摩擦力增大图5D.物块A所受摩擦力减小9.如图6所示，质量为M、倾角为0的斜面体置于粗糙水地面上，质量为m的物块静止在斜面上。用行于斜面的拉力F拉物块使其沿斜面运动，斜面体始终静止，最大静摩擦力等于滑动摩擦力，则A.若物块匀速向上运动，则地面对斜面体的摩擦力大小等于FsinθB.若物块匀速向上运动，则地面对斜面体的支持力大小等于M(M+m)g-Fsinθ图6C.若物块匀速向下运动，则地面对斜面体的摩擦力大小等于FcosθD.若物块匀速向下运动，则地面对斜面体的支持力大小等于Mg+Fsin610.如图7所示，倾角为0的光滑斜面固定在水地面上，一轻弹簧下端固定于斜面底端，处于原长状态，斜面顶部有两个质量分别为m和2m的A、B小球，用轻杆连着。现由静止沿弹簧轴线方向释放两个小球，重力加速度大小为g，弹簧始终处于弹性限度内。则在B球与弹簧接触至运动到最低点的过程中，下列说法正确的是A.A球的机械能先增大后减小B.B球到达最低点时杆对A球的作用力大小等于mgsinθC.B球克服弹簧弹力做的功是杆对B球做功的3倍D.弹簧对B球做的功等于A、B两球机械能的变化量图7物理·第3页（共6页）L口

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8．下列实验方案设计、现象和解释都正确的是10. Cl2O 可用于水的杀菌消毒，遇水发生反应：ClO+H20 一2HCIO。下列说法正确的是9.X、Y、Z、W是原子序数依次增大的前 20号元素，常温下只有一种元素的单质为气态，基11．干冰(固态二氧化碳)在一78°℃时可直接升华为气体，其晶胞结构如下图所示，下列说法不正D. 湿润的蓝色石蕊试纸变红后褪色,说明 SO2 水溶液显酸性和 SO2 具有漂白性 B. 烧瓶壁发热, 说明反应 S,O2 (aq)+2H(aq) =S(s)+H2O(1)+SO2(g)放热A.Ba（NO3)2溶液未产生沉淀态X原子s轨道上的电子数是p 轨道上的2倍，Y 的简单氢化物与其最高价含氧酸反应会产选项C.C.氢化物的沸点：Y>Z>X子。下列说法不正确的是生白烟，Z的一种单质为淡黄色固体且易溶于XZ，基态W原子的N层只有1个未成对电BAD.每个晶胞中含有4个CO2分子C. 每个 CO2分子周围有 12 个紧邻 CO2 分子B.干冰升华时需克服分子间作用力A.CO2 晶胞的堆积方式为非密堆积确的是D.极性：H2OZ>X>Y D. 上述 4 种元素形成的某种化合物的溶液可用于检测 Fe3+试纸呈微红色溶液紫色褪去无蓝色沉淀生成 Zn 可以保护 Fe 不被腐蚀大现象NH 发生水解葡萄酒中含 SO2解释

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1、河北省秦皇岛市某校2024-2025学年第一学期期中演练九年级数学试题1、河北省秦皇岛市某校2024-2025学年第一学期期中演练九年级数学试题1、余江一中2025届高三年级第二次模拟考试（25-T-116C）历史试题