模拟试卷二
2024年辽宁省沈阳市初中学业水平考试模拟试卷英语试题(二)(含答案)
2024年辽宁省初中学业水平考试(模拟卷二)英语试卷(本试卷共45道题满分90分考试时间90分钟)考生注意:所有试题必须在答题卡指定区域内作答,在本试卷上作答无效第一部分选择题(共50分)一、阅读理解(共20小题,每小题2分,满分40分)第一节阅读下面语言材料,从每题所给的A、B、C、D 四个选项中选出最佳选项。
A1.Chen begins his work at .A.6:3 p.m.B.7:00 p.m.C.7:00 a.m.D.7:30 a.m.2.It's about 11:50 a.m.now.Chen may be .A.resting at homeB.having lunch outsideC.collecting rubbishD.on his way to Changping3.Chen visits the rubbish recycling station a day.A.onceB.twiceC.three timesD.four times 4.The text is about Chen'sA.interestB.jobC.total incomeD.daily timetableBChina showed its power at the ISU Short Track Speed Skating (短道速滑)World Cup in Montreal,Canada,which took place from October 20 to 22.China won its first gold medal of the season in the mixed 2,000 meters relay (接力赛)on October 21,with the great performance of Gong Li, Zang Yize, LiuShaolin and Liu Shaoang. Liu Shaoang also won the men's 500m final (决赛)on October 22.If you watch the competition,you will be amazed by the rocket-like start of the skaters. It needs the skaters to use great explosive power (爆发力).Short track speed skating is all about speed.As they race around the track,top skaters can reach a speed of 50 km an hour.They shift (转移)their weight between their legs and reach out their hands to keep up speed.Skaters are allowed to overtake (超过)others at any point during the race,but corner overtaking is the best way.Short track speed skating came about in Canada in the 1880s,but has grown popular in Asia since the 1990s. According to Xinhua,China,South Korea and Canada are the top performers at the World Short Track Speed Skating Championships.Team China is getting ready for the Milano Cortina 2026 Winter Olympics.“The new season at ISU is a chance to train both new and experienced players for the coming games,” Zhang Jing ,the coach of the national team,told Xinhua.5. What does the underlined word“It” refer to?A.The score.B.Racing around the track.C.The rocket-like start.D.Watching the competition.6. Which picture can best describe the way of keeping up speed when skating?B.7.(新考法·跨学科试题)Short track speed skating has been popular in Asia for aboutA.20 yearsB.30 yearsC.40 yearsD.140 yearsD.C.8.W hat can be the best title for the text?A.Flying on iceB.Fighting for2026C.The history of skatingD.Showing power at the ISUCFrom the moon to Mars,scientists have been looking for water—the key tolife—in the solar system for decades.Recently,they have turned to Jupiter(木星)!On April 14, the European Space Agency's(ESA) JUICE spacecraftsuccessfully lifted off from French Guiana in South America.JUICE,short for“Jupiter Icy Moons Explorer”,will collect data from Jupiter and its three moons,Europa,Ganymede and Callisto.The three moons are believed to have big oceans of liquid water(液态水) under their icy shells (壳) .According to ESA,the water on these moons could be six times as much as the amount in Earth's oceans. The mission( 任务) “will change our understanding of the solar system”,wrote Scientific American.In 1998,NASA's Galileo spacecraft found that Europa might be ejecting(喷射)water as far as 160 kilometers into space.That gave scientists the idea of studying the icy moons of Jupiter.The oceans under these moons are likely to be tens of kilometers deep.But they are also trapped under tens of kilometers of ice,making it very difficult to study them.Although JUICE cannot land on the surface,it has lots of high-tech equipment to study the moon's environment,including spectral imaging(光谱成像)tools and radar(雷达) .“They could give more data on things like the thickness of the oceans,their salt content(含量),and their distance from the icy shells above,”reported Phys. org.“The main goal is to understand whether there are habitable(适合居住的) environments among those icy moons and around a giant planet like Jupiter,”JUICE team member Olivier Witasse said during a press conference(发布会)on April 6.9.JUICE has been sent to look for _on Jupiter.A.airB.sandC.goldD.water10.Paragraph 4mainly wants to tell usA.how far water can be ejectedB.why scientists wanted to study JupiterC.what NASA's Galileo spacecraft foundD.which spacecraft was used to explore the universe11.The underlined word"trapped"in Paragraph 5 has the closest meaning to" ”.A.lockedB.createdC.collectedD.taken12.The purpose of the task is to find out if .A.there are living things out thereB.life can live on some of Jupiter's moonsC.there are lakes in the universeD.we can move water from Earth to the moons of JupiterDThe hot pot has a long history of about 2,000 years.The hot pot used to be preferred in winter, but recently it has been appearing on tables all year round.Apart from(除了……外)its delicious taste,there are two other important reasons for the Chinese to like the hot pot.The first one is that the hot pot is considered a great way to make new friends. People gather around the pot,chatting,eating,drinking and having fun.The other is that the hot pot is a healthy meal.Eating the hot pot can warm the body and improve circulation(血液循环)in winter, and increase perspiration(出汗)to help cool the body in summer.There are several kinds of hot pots in China with different soup.Two of the most popular hot pots are Sichuan hot pot and Beijing mutton hot pot.Sichuan hot pot is famous for its numbing and spicy(又麻又辣的)taste,due to the addition of a special food material—Sichuan pepper—and other spicy things like chilli,which makes it different from other hot pots.Beijing mutton hot pot is regarded as the typical northern China hot pot.Mutton is its main part,and the soup is made from lamb bones.When you eat a hot pot in a restaurant,generally,there are two kinds of soup bases:spicy and clear.A clear soup base has quite a mild(温和的)taste,which is made from seafood or meat bones.A spicy soup base usually has Sichuan pepper,which is spicy and salty.If you have a mixed group with some who don't eat spicy food,there is a special pot with a divider in the middle between the spicy and clear soup,which is called a double-flavor hot pot(鸳鸯锅).13.The hot pot is popular because①it tastes delicious②it is cheap and easy to make③it is a way to make friends④it is a healthy mealA. ①②③B. ②③④C.①③④D.①②④14.Paragraph 4mainly talks aboutA.the typical northern China hot potsB.the introduction of two hot potsC.the taste of Sichuan hot potD.the food material of Sichuan hot pot15.In Paragraph 6, the writer advises the mixed group toA.give up eating any hot potB.choose a clear soup baseC.enjoy Beijing mutton hot potD.try a double-flavor hot pot16.Match the different kinds of the hot pots with the characters(特点)according tothe passage,①Sichuan hot pot ②Beijing mutton hot pot ③double-flavor hot pota.a typical northern China hot potb.the numbing and spicy tastec.the clear soup and the spicy soup are both includedA.①—b;②—a;③—cB.①—a;②—b;③—cC.①—c;②—a;③—bD.①—b;②—c;③—a第二节阅读短文,从方框内所给的选项中选出可以填入空白处的最佳选项,其中有一个多余的选项。
2023届湖南省重点大学附属中学高三下学期模拟试卷(二)物理试题及答案
湖南重点大学附中2023届模拟试卷(二)物理注意事项:1.答卷前,考生务必将自己的姓名、准考证号填写在答题卡上。
2.回答选择题时,选出每小题答案后,用铅笔把答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
回答非选择题时,将答案写在答题卡上。
写在本试卷上无效。
3.考试结束后,将本试题卷和答题卡一并交回。
第Ⅰ卷一、单项选择题(本题共7小题,每小题4分,共28分。
每小题给出的四个选项中,只有一个选项是符合题目要求的)1.下列说法正确的是A.图(a)中,观看3D电影时佩戴特殊的眼镜是运用了双缝干涉的原理B.图(b)叫牛顿环,是光的衍射现象C.图(c)水中的气泡看上去特别明亮,是由于光发生了折射引起的D.图(d)所示光导纤维的内芯折射率比外套大2,如图甲所示是用光照射某种金属时逸出的光电子的最大初动能随入射光频率的变化图像(直线与横轴的交点的横坐标为4.29,与纵轴的交点的纵坐标为0.5),如图乙所示是氢原子的能级图,下列说法正确的是A.根据该图像能求出普朗克常量B.该金属的逸出功为0.5eVC.该金属的极限频率为D.用能级的氢原子跃迁到能级时所辐射的光照射该金属能使该金属发生光电效应3.很多智能手机都有加速度传感器,能通过图像显示加速度情况。
用手掌托着手机,打开加速度传感器,手掌从静止开始迅速上下运动,得到如图所示的竖直方向上加速度随时间变化的图像,该图像以竖直向上为正方向,重力加速度的大小,由此可判断出A.手机可能离开过手掌B. 手机在时刻运动到最高点C.手机在时刻改变运动方向D.手机在~时间内,受到的支持力先减小再增大4.如图,光滑绝缘水平面上,由1、2、3三个带电量均为+q、质量均为m的相同金属小球,均用长为L的三根绝缘细绳连接,A、B、C分别为三根绝缘细绳的中点,O为三角形中心,现选取无穷远处为电势零点(已知单个点电荷q周围空间的电势,r为到点电荷的距离),则下列说法正确的是A.O点的电场强度不为零,且方向向上B.若长度L可调节,则A、O两点的电势可能相等C.系统的总电势能为D.系统的总电势能为5.如图所示,一理想自耦变压器线圈AB绕在一个圆环形闭合铁芯上,左端输入正弦交流电压,L1为相同的灯泡,其电阻均为且恒定不变,定值电阻的阻值为灯泡阻值的。
2024年浙江省杭州市中考英语模拟试卷(二)(含详细答案解析)
2024年浙江省杭州市中考英语模拟试卷(二)一、完形填空:本大题共15小题,共15分。
Nervously,but for courage,I held the rope of my guide dog Coco a bit tighter when we passed by my neighbour's yard.Walking by Mr.Smith's (1)______ was the best part of our morning walk.And also the (2)______ .The sweet smell of the beautiful roses in Mr.Smith's yard was absolutely the best.The worst,came from Mr.Smith,an ice-cold man."Hello,Mr.Smith."I greeted him as usual,and hedidn't (3)______, as usual.But I knew (4)______ was there,at the door.I could hear him take a few steps back.Without eyesight(视力),my (5)______ were like my"eyes" and even better than them sometimes.I heard him (6)______ the door quickly and everything went silent.I wondered (7)______ Mr.Smith always ignored(忽视) me."Why (8)______ two people who both like roses be friends?" The question circled in my mind for long.Maybe because I'm blind(盲的)?Disabled people sometimes do make people (9)______ .They are different from common people and some even look strange.But I heard him playing chess with Jimmy who's in a wheelchair. Maybe local people dislike foreigners But he and my brother Joe get on well.Maybe because I'm a girl?( 10)______ when my friend Helen greets him,he says hello to her warmly.So Mr.Smith likes Jimmy,Joe and Helen,but not me and Coco!Wait!I (11)______ seemed to understand the reason he didn't talk to me.I just needed to prove(证实) it.I tied Coco to a tree,felt my way and moved slowly.Without Coco leading the way,I was not sure about each step.I heard his gate open."Jenny!Be (12)______ !"Mr.Smith shouted worriedly and the next second,he took me by the arm."Mr.Smith,I didn't think you liked me.Now I guess I've (13)______ the secret—you are afraid of Coco?"I asked him in a low voice."Yeah,Jenny.You know,your Coco is such a...big dog." Mr.Smith laughed,feeling embarrassed(尴尬的)( 14)______ a child being caught."Your fear of Coco may be big,but our (15)______ is BIGGER!I'll help e..."1.A. yard B. study C. kitchen D. bedroom2.A. best B. worst C. easiest D. hardest3.A. move B. notice C. reply D. escape4.A. I B. it C. he D. she5.A. eyes B. ears C. hands D. feet6.A. open B. shut C. repair D. answer7.A. how B. why C. when D. where8.A. can't B. mustn't C. needn't D. won't9.A. excited B. lucky C. angry D. afraid10.A. So B. And C. But D. Because11.A. certainly B. suddenly C. recently D. naturally12.A. honest B. polite C. confident D. careful13.A. paid for B. found out C. made up D. suffered from14.A. like B. for C. except D. with15.A. dream B. happiness C. friendship D. surprise二、补全对话-填空:本大题共1小题,共10分。
2023年河北省衡水市中考物理仿真模拟试卷(二)(含解析)
2023年河北省衡水市中考物理仿真模拟试卷(二)一、单选题(本大题共11小题,共22.0分)1. 用分子的观点解释下列现象,正确的是( )A. 水结成冰——温度降低,分子停止运动B. 汽油挥发——分子体积变大C. 热胀冷缩——分子的大小随温度的改变而改变D. 轮胎充气——分子间有间隔2. 人们在生活和生产中为了防止发生事故,常需要采取一些安全措施。
下列对安全措施的解释错误的是( )A. 乘客乘车时需要系好安全带,是为了减小汽车行驶中人的惯性B. 油罐车的下面拖着一条铁链,可以避免静电放电带来的危害C. 冬天用煤炉生火取暖需要通风,是为了防止煤气中毒D. 加油站、面粉厂等地严禁烟火,是为了防止发生爆炸3. 分类是认识和研究问题的重要方法。
下列分类正确的是( )A. 导体:铅笔芯、铜、橡胶B. 非晶体:食盐、松香、沥青C. 单质:金刚石、石墨、煤D. 混合物:医用酒精、空气、碘酒4. 下列探究实例中,运用了控制变量法的是( )A. 探究杠杆平衡的原理B. 研究电流大小时,根据电流产生的热效应大小来判断电流的大小C. 探究铁生锈的条件D. 探究酸碱是否发生反应5. 逻辑推理是学习的常用思维方法,下列推理正确的是( )A. 平衡力大小相等、方向相反,则大小相等、方向相反的两个力一定是平衡力B. 酸溶液pH<7,但pH<7的溶液不一定是酸溶液C. 有机物中都含有碳元素,则含有碳元素的化合物一定是有机物D. 钢铁制成的轮船可以漂浮在海面上,则钢铁的密度一定小于海水的密度6. 下列对如图所示内容的解释错误的是( )A. 甲:微小压强计是连通器B. 乙:紫色小花喷水的部分变红,未喷水的部分不变色,说明CO2能与水反应C. 丙:为了验证“导体电阻跟长度是否有关”,应选用的导体是b、cD. 丁:通入氧气后水中的白磷燃烧,说明燃烧需要氧气7. 下列数据中,符合实际的是( )A. 一支全新2B铅笔的长度约为18dmB. 一个篮球的质量约为500gC. 我国高速公路的最高限速为120m/sD. 按照国家规定,夏天公共建筑内的空调温度应控制在10℃左右8. 下列关于声和电磁波的说法正确的是( )A. 物体振动越快,发出声音的响度越大B. 地震、火山喷发等自然灾害会伴有超声波的产生C. 在主干道旁设置噪声监测设备或隔音板,都是为了减弱噪音D. 倒车雷达与军事雷达传播的媒介是不同的9. 下列有关物态变化的说法正确的是( )A. 昆虫身上露珠的形成是液化现象,会吸热B. 夏天从冰箱中取出的冰块“冒白气”,是汽化现象,会放热C. 冬天窗户玻璃上出现的冰花是凝华现象,会放热D. 植物上雾凇的形成是凝固现象,会吸热10. “注意安全,珍爱生命”是同学们必备的意识,下列有关家庭用电的说法正确的是( )A. 电灯的开关应接在零线与电灯之间B. 在停电期间检修电器,不需要断开总开关C. 只有大功率的用电器才需要使用三孔插座D. 使用试电笔时,手要接触笔尾金属体11. 在“探究凸透镜成像规律”的实验中,光具座上各元件位置如图所示,此时在光屏上恰好成一个清晰的像,下列说法正确的是( )A. 幻灯机应用了这一成像规律B. 若只升高凸透镜,光屏上的像会向上移动C. 若凸透镜不动,光屏与蜡烛对调,光屏上不能承接到清晰的像D. 贴近凸透镜左侧放一老花镜,要想再次得到烛焰清晰的像,需向右移动光屏二、多选题(本大题共3小题,共9.0分)12. 下列说法正确的是( )A. 物体受到力的作用时,运动状态不一定发生变化B. 高速行驶的汽车不容易停下来,说明速度越大惯性越大C. 人用力推放在水平地面上的木箱,没推动,说明推力小于箱子受到的阻力D. 人造卫星绕地球沿椭圆轨道从远地点向近地点运动的过程中,势能转化为动能13. 下列有关电与磁的说法不正确的是( )A. 导体在磁场中做切割磁感线运动,不一定产生感应电流B. 电磁铁的磁性强弱只与电流大小有关C. 小磁针静止时N极所指的方向与该点的磁场方向相同D. 动圈式话筒的工作原理是磁场对电流有力的作用,工作时将电能转化成机械能14.如图所示的电路中,电源电压保持不变,a是电流表或电压表,R1和R2为定值电阻,R3为滑动变阻器,R1的阻值大于滑动变阻器的最大阻值。
2023年初中学业水平考试物理模拟试卷(二)(云南新中考)(解析版)
保密★启用前2023年初中学业水平考试模拟试卷(二)物理(全卷五个大题,共23个小题,满分90分,考试用时75分钟)(本试卷题型与分值设置依据2023年云南学业水平考试物理试卷最新信息预设)注意事项:1.答卷前,考生务必将自己的姓名、准考证号填写在答题卡上。
2.回答第Ⅰ卷时,选出每小题答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
写在本试卷上无效。
3.回答第Ⅰ卷时,将答案写在答题卡上。
写在本试卷上无效。
4.考试结束后,将本试卷和答题卡一并交回。
第Ⅰ卷(选择题)一、选择题(共10小题,满分30分。
1-7题为单选题,8-10题为多选题,全部选对得3分,选对但不全得1分,选错项得0分)1.为了加强管理,某单位利用人工智能技术,实行“刷脸”考勤制度。
如图所示,下列有关说法正确的是()A.“刷脸”时,面部经摄像头成倒立放大的实像B.“刷脸”时,面部应位于摄像头两倍焦距之外C.摄像头成像特点与投影仪相同D.“刷脸”时,面部经摄像头成倒立缩小的虚像【答案】B【详解】刷脸时,面部位于摄像头镜头的两倍焦距以外,成倒立缩小的实像,生活中的照相机就是根据这个原理制成的,故ACD错误,B正确。
故选B。
2.2022年6月17日,中国人民解放军海军福建舰(简称福建舰)下水。
福建舰配置电磁弹射和阻拦装置。
电磁弹射是指以电磁力为加速手段,当电磁弹射的弹射车轨道与航母舰载飞机前轮接触,并处于强磁场中,弹射车内的导体通过强电流时,即可受到强大的推力,将航母舰载飞机弹出。
如图所示,下列装置图能反映电磁弹射原理的是()A.B.C.D.【答案】C【详解】由题意可知,电磁弹射器的弹射车与飞机前轮连接,并处于强磁场中,当弹射车内的导体通以强电流时,即可受到强大的推力,由此可知其原理是通电导体在磁场中受力而运动;A.图中是奥斯特实验,说明了电流周围存在磁场,与电磁弹射器工作原理不一致,故A 不符合题意;B.图中实验探究的是电磁铁的磁性与线圈匝数的关系,匝数越多,磁性越强,与电磁弹射器工作原理不一致,故B不符合题意;C.图中有电源,通电导体棒在磁场中受力而运动,即与电磁弹射器工作原理相同,故C 符合题意;D.图中没有电源,是闭合电路的部分导体在磁场中做切割磁感线运动,产生感应电流,是电磁感应现象,与电磁弹射器工作原理不一致,故D不符合题意。
高中物理精品试题:高中物理学业水平考试模拟试卷(二)(必考题)
高中物理学业水平考试模拟试卷(二)(必考题)(时间:60分钟,分值:70分)选择题部分一、选择题Ⅰ(本题共13小题,每小题3分,共39分。
每小题列出的四个备选项中只有一个是符合题目要求的,不选、多选、错选均不得分)1.下列物理量中属于矢量的是( C )A.功B.动能C.加速度D.重力势能2.自然界的电、热和磁等现象都是相互联系的,很多物理学家为寻找它们之间的联系做出了贡献。
下列说法不正确的是( B )A.奥斯特发现了电流的磁效应,揭示了电现象和磁现象之间的联系B.欧姆发现了欧姆定律,说明了热现象和电现象之间存在联系C.库仑发现了库仑定律,揭示了真空中点电荷之间相互作用的规律D.焦耳发现了电流的热效应,定量给出了电能和热能之间的转换关系3.如图是一种简易电动机模型,固定在水平面上的强磁铁和干电池可以使“心形”线圈旋转,则使线圈运动状态发生改变的力主要是( D )A.弹力B.摩擦力C.库仑力D.安培力4.我国《道路交通安全法》中规定:各种小型车辆前排乘坐的人员(包括司机)都必须系好安全带,如图所示,这是因为( D )A.系好安全带可以减小人的惯性B.系好安全带可以减小车的惯性C.系好安全带可以增大人与座椅间的摩擦力D.系好安全带可以防止因人的惯性而造成的伤害5.如图所示,一只重为G的松鼠站在倾斜角为α的树枝上,则树枝对松鼠的作用力为( C )A.Gcos αB.Gtan αC.GD.Gsin α解析:树枝对松鼠的作用力与松鼠的重力G是一对平衡力。
6.一飞船返回舱进入大气层后,在离地面20 km处打开减速伞,如图所示。
在返回舱减速下降的过程中( B )A.伞绳拉力对返回舱做正功B.返回舱所受合力做负功C.返回舱的机械能增加D.因空气阻力自然界的总能量减少了解析:在减速下降过程中,伞绳的拉力向上,绳的拉力做负功,故A错误;返回舱做减速运动,故所受合力做负功,B正确;因空气阻力,返回舱的机械能减少,而自然界的总能量守恒,C,D错误。
2023年广东省中考模拟试卷(二)
2023年广东省中考模拟试卷(二)学校姓名成绩一、选择题:本大题共7小题,每小题3分,共21分。
在每小题给出的四个选项中,只有一想是符合题目要求的。
1、在国际单位制中,电功的单位是()A焦耳(J)B. 伏特(V)C.瓦特(W)D.安培(A)2、中华美食与物理知识意息相关,以下分析正确的是()A.麻花被炸得金黄是因为油的熔点高B.开大火能使正在沸騰的火锅汤温度升高C蒸汤包是通过做功的方式增加汤包的内能D.烤鸭香气四溢说明分子在永不停息地做无规则运动3、关于能的概念,下列说法中正确的是()A.一个物体能够做功,就说这个物体具有能B.一个物体已做过的功越多,说明这个物体具有的能越多C一个物体做了功,说明这个物体具有能D.用线悬挂着的小球,没有做功,所以没有能4、有关电和磁的知识,下列说法正确的是()A. 电动机工作将机械能转化为电能B. 摩擦起电的实质是创造了电荷C.通电导体的周围真实存在磁感线D.同名磁极相排斥异名磁极相互吸引5、对下列古诗文中涉及的热现象进行解释,其中正确的是()A.“月落乌啼霜满天,江枫渔火对愁眠。
”霜的形成是凝固现象B.“罗凇沆砀,天与云与山与水,上下一白。
”雾凇的形成是凝华现象C.“青青园中葵,朝露待日晞。
”露在日出后逐渐消失是升华现象D.“腾蛇乘雾,终为土灰。
”雾的形成是汽化现象6、用一个动滑轮在8s内将一重为300N 的物体匀速向上提起2m,拉力为 200 N。
这个动滑轮的机械效率和拉力的功率分别是()A. 66.7%50 WB. 66.7%100 WC. 75% 50 WD. 75%100 W7、下列关于太阳能的说法正确的是()A. 太阳能属于二次能源B.太阳能属于不可再生能源C.太阳是一个巨大的“核能火炉”D.太阳能电池直接将太阳能转化为化学能二、填空题:每空1分,共21分。
8、冰块很冷,冰块(填“具有”或“不具有”内能。
用热水袋取暖,是通过的方式改变内能;冬天搓手可以感到温暖,此过程是能转化为内能。
湖南省长沙市2023届高三下学期模拟(二)语文试卷含解析
长沙市2023届模拟试卷(二)语文(答案在最后)注意事项:1.答卷前,考生务必将自己的姓名、准考证号填写在答题卡上。
2.回答选择题时,选出每小题答案后,用铅笔把答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
回答非选择题时,将答案写在答题卡上。
写在本试卷上无效。
3.考试结束后,将本试卷和答题卡一并交回。
一、现代文阅读(35分)(一)现代文阅读Ⅰ(本题共5小题,17分)阅读下面的文字,完成1~5题。
材料一:有一些学者对ChatGPT在教育中的使用表示担忧。
总的来说,虽然ChatGPT在教育中的应用存在很大潜力,但也存在学业诚信遭质疑、师生过度依赖、信息传输不准确等风险与挑战。
ChatGPT能在多门学科中帮助学生完成学习任务,提高教学成果的完成度与创意感,但也引发了学者们对学生学业诚信的担忧。
有研究者提出,ChatGPT可能会帮助学生实施作弊,使教育评估机制失去平衡,导致教育不公平的问题。
有研究者通过测试ChatGPT与真实考生在大学开放性考试中的作答结果后表示,ChatGPT的推出可能导致在线考试和开放性考试学术诚信的终结,因为ChatGPT的考试答案展现出了高度的批判思维和逻辑思维,能在很少的输入下生成高度逼真的文本,使学生在考试中作弊成为可能。
此外,教务人员也表示很难区分学生和ChatGPT生成的写作内容,并且当学生使用ChatGPT回答问题时,教务人员很难充分评估学生的真实理解水平。
诚然,ChatGPT和其他内容生成类模型能为学生提供互动学习,让学生在互动中受益。
2014年的一项研究也证明,与模仿人类情感行为的虚拟导师互动的学生学习效果更好。
但是,学生在多次使用ChatGPT后,很可能会产生一定的依赖心理。
尤其在多次使用其协助完成学习任务并获得较好的成绩后,学生很可能沉迷于其效果。
因智能工具产生依赖进而养成惰性心理是有先例的。
如早前多有报道学生依赖作业搜题工具而导致学习成绩下降的问题。
2023届上海市上海中学高三模拟卷练习二英语试卷(含答案)
高考英语上海卷模拟试卷(二)考生注意:1.考试时间120分钟,试卷满分140分。
2.本考试设试卷和答题纸两部分。
第I卷(共90分)I. Listening Comprehension (25 分)Section A (每题1分,共10分)Directions: In Section A, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions will be spoken only once. After you hear a conversation and the question about it, read the four possible answers on your paper, and decide which one is the best answer to the question you have heard.II. Grammar and Vocabulary (每题1 分,共20 分)Section ADirections: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, used one word that best fits each blank.An implant that can cool nerves to block pain signals has been unveiled by researchers who say the device could offer an alternative to drugssuch as opioids (类鸦片活性肽).The team behind the device say it could bring benefits for management of acute pain such as (21)_______ experienced after amputations (截肢)or nerve grafts."We are optimistic that this represents a very promising starting point for an engineering approach (22)_______ treating pain,” said Prof John Rogers of Northwestern University in the US, a co-author of the research. But he cautioned that it might be some time (23) _______ they were available to patients. "As with any implantable device, the regulatory process can be slow, typically (24) _______ (involve) much more extensive animal model studies over a period of years," he said.Writing in the journal Science, the team report that the device to block pain signals, which (25) _______(test) only on rats so far, involves a pump, external control system and an implant made from a soft, rubbery substance. The latter forms a sealed collection of tiny channels which form a twisting path in the part of the implant that sits around the target nerve like a cuff.When liquid coolant and dry nitrogen flow through the implant, the liquid causes a drop in temperature. An electronic sensor in the device allows the temperature at the nerve (26) _______(keep) constant."All body processes are based on metabolic chemical reactions, motions of ions and flows of fluids--all (27) _______slow down as a result ofcooling,” said Rogers. “ The net effect when cooling is applied to a nerve is in blocking of electrical signals."Among their experiments, the team tracked two rats with an injury, recording over a three- week period the minimum force that (28)_______be applied to the hind paw to cause the animal to retract (缩回)it. This data was then compared against three rats who were similarly injured but also had the implant. The results suggest bouts of cooling of the injured nerve from 37℃ to 10℃led to (29) _______(severe) pain, with a sevenfold increase in the force that could be applied to the paw. The team say the implant’s benefits include (30)_______, in contrast to opioids, it is not addictive. As the implant is made with water-soluble and biocompatible materials, it can break down in the body after use. The implant could be inserted as an extension of the patient’s initial surgery.Section BDirections: Complete the following passage by using the -words in the box. Each word can only be used once. Note that there is one more word than you need.A. attachedB. bottle-fedC. confusionD. invisibleE. originallyF. orphanedG. partneringH. procedureI. reproducedJ. subjectsK. unintentionallySaving Baby BearsReacting to the auditory assault of barking dogs, shouts and rifle blasts, a 168-pound American black bear shot out and hightailed (迅速逃走)it into the woods off a logging road.His sister, weighing in at 135 pounds, took a little more time to overcome her fear and (31) _______ before she, too, ran for the trees and away from the humans who had driven more than 100 miles to witness the bears’ return to the wild.The cubs were the 106th and 107th (32) _______ or injured bears to be raised or treated at the Progressive Animal Welfare Society (PAWS) Wildlife Center in Washington state, then released months later in the same general area where they were (33) _______found. Fitted with GPS collars and tattooed with identification numbers on their gums, the bears are also among the latest (34) _______of a long-term research study being conducted by Rich Beausoleil and Lindsay Welfelt, both biologists and bear and cougar specialists.The siblings were only two weeks old when a forest worker and his dog (35) _______ disturbed their den in February 2020, scaring away their mother. She never returned.The worker contacted the WDFW, an agency (36) _______with PAWS to rehabilitate sick, injured wild animals before releasing them back into their natural habitats."Their eyes and ears weren't open, and their teeth hadn't evenerupted,Jennifer Convy, PAWS senior director of wildlife, said of the cubs, which each weighed less than 2 pounds when they arrived and were the youngest ever to be raised at the center.Though (37) _______at first, the cubs weren't cuddled. Instead, their caregivers wore bear- scented bear suits during feedings once the cubs' eyes had opened. At PAWS, the staff and volunteers take pains to be (38)_______to all the animals in their care."They don't see us, ever. We don't talk to them. We don't name the animals because we don't want our staff or volunteers to get (39)_______,“ Convy said. After more than a year, the bear siblings were released.The wildlife biologists are studying how the bears raised at PAWS fare after their release, compared to their wild-reared brethren. One cub released in 2017 had her first litter of cubs in January."We've been to her den several times." Beausoleil said. "She (40)_______ and had cubs of her own ... This was kind of a turning point for us."After all, the whole point of PAWS' rehabilitation "is to protect and perpetuate (使持续) the species," he said.III. Reading Comprehension (45 分)Section A (每题1分,共15分)Directions: For each blank in the following passage there are four wordsor phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.The Other da Vinci CodeFor centuries, two of the most intriguing questions about Leonardo da Vinci's "Mon a Lisa" were "Who " and "When ”A(n) (41) _______made at Heidelberg University in 2005 pretty much answered both. A note written in a manuscript in the library (42) _______the account of da Vinci's first biographer, Giorgio Vasari: that the sitter was a merchanfs wife, Lisa Gherardini. The note also helped date the masterpiece to between 1503 and 1506.A(n) (43)_______ mystery-"Where "- is still in dispute. But on June 3rd a French engineer, Pascal Cotte, declared that he and a collaborator had (44) _______the landscape in the background of the painting. Arguments had (45)_______ been made for stretches of countryside in the Marche region and between Milan and Genoa. During a presentation in Vinci, near Florence, Mr Cotte maintained that the artist was more plausibly depicting a part of his native Tuscany 一one that keenly interested him at the time. According to this theory, da Vinci represented the area not as it was, but as, in an unrealised scheme, he (46) _______ it to be.Mr Cotte, who was asked by the Louvre (where the "Mona Lisa" hangs) to create a digital image of the painting, is the inventor of themultispectral camera: a device that can detect not only the drawing below the (47) _______of an oil painting, but also, where they exist, intermediate layers of work. It was among these, under what appears to be a pointed rock, that he found a(n) (48) _______sketch showing that da Vinci meant it to represent a castellated tower.The landscape of the "Mona Lisa" also includes a huge overhanging cliff. That is (49)_______ to one that da Vinci included in a sketch of a fortress (堡垒)contested by Pisa and Florence in the war that flared between them in 1503 (around the time he was painting Gherardini). The (50)_______ with the nearby cliff ——and a tower, known as the Caprona tower 一all overlook the river Amo as it snakes from Florence to Pisa. All three also feature in drawings made by da Vinci to illustrate a plan about which, says Mr Cotte, he became “(51) _______”.This involved diverting the Amo to (52) _______Pisa's water supply and give Florence an outlet to the Mediterranean. In the early 1500s, with the two citystates at war, the idea was under active consideration. Mr Cotte argues that a(n) (53) _______ winding through desolate countryside at the right of the "Mona Lisa" is too wide to be a road, as some have speculated, and is(54) _______the driedup bed of the Amo as da Vinci envisaged (设想)it once his plan had been adopted.It never was. But if Mr Cotte's theory is right, it might just explain why Gherardini, a Florentine, exhibits such a contented, if mysterious, (55)_______。
2023届普通高等学校招生全国统一考试仿真模拟历史试卷(二)
2023年普通高等学校招生全国统一考试仿真模拟试卷(二)历史本试卷共8页,20小题。
满分100分,考试用时75分钟。
一、选择题:本大题共16小题,每小题3分,共48分。
在每小题给出的四个选项中,只有一项符合题目要求。
1.我国有着重视历史记载的传统,尤其是涉及上古时期、带有传说色彩的史料记载,如都邑之地必有城垣,而考古学的发现却带来了关于上古时期“大都无城”的思考。
这表明( ) A.考古发现更新对中华文明的认知 B.古代修史方法不当不能反映历史真实C.考古资料可与文献资料相互补正D.考古学主要关注社会上层的文化遗存2.汉朝注意开发水利,“朔方、西河、河西、酒泉皆引河及川谷以溉田”。
在河西走廊设置酒泉、张掖、敦煌、武威四郡后,逐渐有计划地向这里进行移民,至西汉末年河西四郡的人口已达二十八万多人。
同时,政府又给徙民和田卒提供必需的农具。
上述做法( )A.说明解决边患问题时机成熟B.表明汉与匈奴间无意继续战争C.着眼于增进民族间经济交流D.是发展生产巩固边防的重要举措3.唐朝有不少僧尼参与家庭佛事活动,与世俗家庭保持密切联系;当俗家亲人去世时,出家僧尼会返回俗家为亲人送葬:有些僧尼出家后仍住在俗家,甚至参与家庭事务的处理。
由此可知,当时( )A.政府的宗教政策非常开明B.佛教得到民众支持C.佛教受到儒家文化的影响D.寺院经济遭遇困难4.《全宋文》收录了大量的宋代《桥记》文献,有学者统计研究发现,桥梁众多的南方水乡地区,地方官员不遗余力地向富民、僧侣劝捐,甚至不惜捐出俸禄作为表率,民间财富逐渐成为最重要的修桥经费来源。
这可以用来说明( )A.经济重心南移已经完成B.地方治理凸显经世情怀C.重农抑商政策亟待调整D.中央集权制度受到挑战5.如图所示为康熙年间王翠所画的《康熙南巡图》(局部)。
该作品( )A.反映了康熙统治时期的国力强盛B.意在歌颂康熙皇帝勤政和爱民的行为C.具有珍贵的史料价值和艺术价值D.体现了统一多民族国家的巩固和发展6.1898年3月,总理衙门先后两次上奏朝廷,建议将湖南岳州、福建三都澳和直隶秦皇岛三地“开设通商口岸”,当即获旨允准。
七年级下册语文期末模拟试卷(二)
七年级下册期末语文模拟试卷(二)考试时间:120分钟满分:120分一、积累运用(33分)。
1.名句默写。
(10分)(1)无丝竹之乱耳,。
(刘禹锡《陋室铭》)(2)念天地之悠悠,。
(《登幽州台歌》)(3)可怜夜半虚前席,。
(李商隐《贾生》)(4) ,阴阳割昏晓。
(杜甫《》)(5)落红不是无情物,。
(龚自珍《己亥杂诗(其五)》)(6)政入万山围子里,。
(杨万里《过松源晨炊漆公店》)(7) ,隔江犹唱后庭花。
(杜牧《泊秦淮》)(8) ,何人不起故园情?(李白《春夜洛城闻笛》)2.阅读下面文字,按要求答题。
(6分)他从唐诗下手,目不窥.园,足不下楼,兀.兀穷年,历尽心血。
杜甫晚年,疏懒得“一月不梳头”。
闻先生也总是头发零乱,他是无xiá及此。
饭,几乎忘记了吃,他贪的是精神食粮;夜间睡得很少,为了研究,他惜寸阴、分阴。
深xiāo灯火是他的伴侣,因它大开光明之路,“漂白了四璧”。
(1)给短文中加点词语注音或根据拼音写出汉字。
(4分)目不窥.园()兀兀..穷年()深xiāo灯火()无xiá及此()(2)句子中有两个错别字,请找出来并订正。
(2分)改为改为3.下列句子中加点词语使用不正确...的一项是()(2分)A.榜样的力量是无穷的,一年一度的“感动中国人物”评选活动对社会的引导作用是不言而喻....的。
B.习近平总书记多次引经据典....谈反腐,向古人借智慧,对今人敲警钟。
C.一拿到语文试卷,小明忍不住笑了,拿起笔开始答题,信心满满,手不释卷....。
D.邓稼先是中华民族核武器事业的奠基人和开拓者。
张爱萍将军称他为“两弹元勋”,他是当之无愧....的。
4.下列句子没有..语病的一项是()(2分)A.广受好评的电视节目《经典咏流传》不但提高了大众对经典诗词的鉴赏水平,而且唤起了人们对经典诗词的记忆。
B.我们不能否认做一个真正幸福的人应该关注自身的精神生活,培养高雅的兴趣爱好。
C.我省要全面加强海洋生态文明建设,提高海洋资源开发利用的效率和范围。
山东省中考语文模拟试卷(二)及答案
山东省中考语文模拟试卷(二)一、基础知识积累与运用(每小题3分,21分)1.下列词语加点字注音有误的一项是()A.参差.(cī)逶迤.(yí)嘟囔.(náng)B.黄晕.(yùn)坍.(tān)塌蜷.(quán)伏C.国殇.(shāng)差.(chāi)使喧嚣.(xiāo)D.亵.(xiè)渎恣.(zì)睢存恤.(xù)2.下列加点词语书写有误的一项是()A.娴熟不屑囫囵潸潸B.殷红震悚修葺告罄C.斡旋打旋翌日草甸D.翡翠伏辨官讳稽手3.下列加点词语使用有误的一项是()A.他听见脚步声,抬起头来,饱经风霜....的脸上现出难以忍受的痛苦。
B.不过,最后等它克服了这种心理障碍后,它马上变得活泼而神采奕奕....起来,并且对我恋恋不舍。
C.还没等观众从一目了然....中反应过来,她已经展开身体,像轻盈的、笔直的箭,“哧”地插进碧波之中,几串白色的气泡拥抱了这位自天而降的仙女,四面水花则悄然不惊。
D.再就写景说,无论遇到何种境遇,要描写得惟妙惟肖,都要费许多笔墨。
但是大手笔只选择两三件事轻描..淡写..一下,完全境遇便呈露眼前,栩栩如生。
4.下列句子修辞手法判定有误的一项是()A.忽然,像被一阵风吹过来似的,远处的小丘上出现了一群马,马上的男女老少穿着各色的衣裳,群马疾驰,襟飘带舞,像一条彩虹向我们飞过来。
(比喻)B.耳朵里有不可捉摸的声响,极远的又是极近的,极洪大的又是极细切的,像春蚕在咀嚼桑叶,像野马在平原上奔驰,像山泉在呜咽,像波涛在澎湃。
(排比)C.布谷鸟开始唱歌,劳动人民懂得它在唱什么:“阿公阿婆,割麦插禾。
”这样看来,花香鸟语,草长莺飞,这是大自然的语言。
(引用)D.“这是斜对门的杨二嫂,……开豆腐店的。
”……但这大约因为年龄的关系,我却并未蒙着一毫感化,所以竟完全忘却了。
然而圆规很不平,显出鄙夷的神色。
(比喻)5.下列各句子加点词语解释有误的一项是()A.牛斗力在角,尾搐入两股.间(《书戴嵩画牛》)股,大腿;B.徐以杓.酌油沥之(《卖油翁》)杓,同“勺”,子;C.乃不知有汉,无论..魏晋(《桃花源记》)无论,更不必说;D.得鱼腹中书,固以怪.之矣(《陈涉世家》)怪,责怪;6.下列与各语段相关的文学文化常识表述有误的一项是()A.“记”是古代一种文体,可以记人、记事记物、记游,目的在抒发作者情操和抱负,或阐发作者读某些问题的看法。
2024年全国高考体育单招考试英语模拟试卷试题二(含答案详解)
2024全国普通高等学校运动训练、武术与民族传统体育专业单独统一招生考试模拟卷(二)注意事项:本试卷分为第一、第二两卷。
第一卷三大题,满分120分;第二卷两大题,满分30分,共150分。
第一卷(三大题,共120分)I.单项选择(共20小题;每小题2分,满分40分)从A、B、C、D四个选项中选出可以填入空白处的最佳答案。
1.—It's everyone's duty to join the Clean Your Plate Campaign.—Sure.We should try to all the food that we've ordered.A.give upB.eat upC.turn upD.show up2.Yongzhou is becoming more and more developed—I agree.But sometimes people have great difficulty a place to park their cars.A.foundB.to findC.findingD.find3.Nowadays we can learn a great deal of about the world through the Internet.rmationB.booksC.peopleD.countries4.Hangzhou is to hundreds of foreign friends who are working and studying here.A.roomB.houseC.familyD.home5.—What do you think of your teachers?—Sometimes they are too strict us our study.A.at,withB.at,inC.with,atD.with,in6.—Let's go fishing if it this weekend.—But nobody knows if it.A.is fine;will rainB.will be fine;rainsC.is fine;rainsD.will be fine;will rain7.Mr.Smith a book about China last year but I don't know if he has finished it.A.has writtenB.wroteC.had writtenD.was writing8.Many children in Britain to have their own bank cards these days.A.allowB.allowedC.are allowedD.were allowed9.It's difficult for me the bed.It's too heavy.A.moveB.movedC.movingD.to move10.—Which is month of the year?—July,I thinkA.hotB.hotterC.hotterD.the hottest11.How dangerous!The car hit the bus just now.A.normallyB.seldomC.nearlyD.hardly12.He found impossible to finish so much homework in an hour.A.itB.thisC.thatD.it's13.Anna is middle school student in Chongqing.A.a11years oldB.a11-year-oldC.an11-years-oldD.an11-year-old14.—The red dress be Linda's,but I'm not sure.—No,it be.It is too small for her.A.may;mustn'tB.may;can'tC.can't;may notD.must;can't15.When he was university student,he dreamed of becoming NBA player.A.an;aB.a;anC.an;anD.the;an16.—Do you know when he tomorrow?—Don't worry.I think as soon as he he will give you a call.A.will come;will comeB.will come;comeses;will comees;comes17.The restaurant wants a waiter can speak French.A.whereB.whichC.whatD.who18.—What are you looking for?—I'm looking for the music CD you lent me yesterday.A.whoB.whomC.whenD.that19.It is in1960Chinese first put our flag on Mount Qomolangma.A.whenB.thatC.whichD.in which20.Michael Jordan has failed over and over again in his life.And that's he succeeds.A.whatB.whenC.whyD.whereII.完形填空(共10小题;每小题2分,满分20分)阅读下面的短文,掌握其大意,然后从21至30各题所给的A、B、C、D四个选项中,选出一个最佳答案。
2024年考研数学二模拟试卷
2024年考研数学二模拟试卷一、选择题(每题1分,共5分)1.设函数f(x)在区间[0,1]上连续,则下列积分中正确的是()A.∫(0to1)f(x)dx=0B.∫(0to1)f(x)dx=f(0)+f(1)C.∫(0to1)f(x)dx=f(1)f(0)D.无法确定2.设矩阵A为对称矩阵,则下列结论正确的是()A.A的逆矩阵也是对称矩阵B.A的特征值都是实数C.A的行列式值为0D.A的对角线元素相等3.设函数f(x)在区间[0,1]上可导,且f(0)=0,f(1)=1,则下列结论正确的是()A.∃c∈(0,1),使得f(c)=0B.∃c∈(0,1),使得f'(c)=0C.∃c∈(0,1),使得f(c)=cD.无法确定4.设数列{an}的前n项和为Sn,则下列结论正确的是()A.若{an}为等差数列,则Sn为等差数列B.若{an}为等比数列,则Sn为等比数列C.若Sn为等差数列,则{an}为等差数列D.无法确定5.设函数f(x)在区间[0,1]上可导,且f'(x)>0,则下列结论正确的是()A.f(x)在[0,1]上单调递增B.f(x)在[0,1]上单调递减C.f(x)在[0,1]上存在极值点D.无法确定二、判断题(每题1分,共5分)1.若函数f(x)在区间[0,1]上可导,则f(x)在[0,1]上连续。
()2.若矩阵A为对称矩阵,则A的特征值都是实数。
()3.若函数f(x)在区间[0,1]上单调递增,则f'(x)>0。
()4.若数列{an}为等差数列,则其前n项和Sn为等差数列。
()5.若函数f(x)在区间[0,1]上可导,且f'(x)>0,则f(x)在[0,1]上单调递增。
()三、填空题(每题1分,共5分)1.设函数f(x)在区间[0,1]上连续,则∫(0to1)f(x)dx表示的是________。
2.设矩阵A为对称矩阵,则A的特征值________。
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图5 A
E
B
C
E 八年级数学期末模拟试卷二
姓名: 班级:
一、填空题(每小题3分,计30分)
1、已知一纳米等于310-毫米,某种细菌的直径约为210-纳米,则三个这样的细菌排列在一起后的总长度约为 (用科学记数法表示)
2.(2011四川内江)如图2,把一块直角三角板的直角顶点放在直尺的一边上, 则∠1+∠2的度数是
3.如图3,E 点为ΔABC 的边AC 中点,CN ∥AB ,过E 点作直线交AB 与M 点,交CN 于N 点,若MB=6cm ,CN=4cm ,则AB=____________
4. 如图4:已知AE ∥BF, ∠E=∠F,要使△ADE ≌△BCF,可添加的条件是__________
(写一个即可).
5. 如图,在△ABC 中,∠C =90°,AD 是∠BAC 的角平分线,若BC= 4cm ,BD:CD= 5:3,则点D 到AB 的距离为 . ,如果要使ABD ∆与
D 是AC 的中点,
设△ABC 、△
ADF 、△BEF 的面积分别为S △ABC ,S △ADF ,S △BEF ,且S △ABC =12, 则S △ADF -S
△
8.如图8所示,AB=2,
AC=4,则AD 的取值范围是__________
图8
9.若等式y=
3
2
-+x x 中,自变量x 的取值范围是 . 10. 已知关于x 的分式方程
2122
a x x -=++的解为负数,那么字母a 的取值范围是 . 二、选择题(每小题3分,计30分)
11.(2012江西)下列运算正确的是 ( ) A. 3362a a a += B. 633a a a -÷= C. 3332a a a ⋅= D. 23(2)a -=68a -
12、如右图,在△ABC 与△DEF 中,已有条件AB =DE ,还需添加两个条件才能使△ABC ≌△
DEF ,不能添加的一组条件是 ( ) A .∠B =∠E ,BC =EF B .BC =EF ,AC =DF C .∠A =∠D ,∠B =∠E
D .∠A =∠D ,BC =EF
13. (2011安徽芜湖)如右图,已知ABC △是等腰直角三角形, F 是高AD 和BE 的交点,4CD =,则线段DF 的长度为 ( )
A .
B . 4
C .
D .14.(2010 重庆)如右图,点B 是△ADC 的边AD 的延长线上一点, ( )
DE ∥AC . 若︒=∠50C ,AD=CD ,则CDB ∠的度数等于
A .︒70
B .100︒
C .︒110
D .120︒
15.(2010 福建三明)已知三角形的两边长分别为3cm 和8cm ,则该三角形的第三边的长可能是 ( )
A .4cm
B .5cm
C .6cm
D .11cm
16. (2011广东省)正八边形的每个内角为 ( )
A .120°
B .135°
C .140°
D .144°
17、如图,某同学把一块三角形的玻璃打碎成了三块,现在要到玻璃店去配一块完全一样的玻璃,那么最省事的办法是 ( )
A. 带①和②去
B. 带③去
C. 带②去
D. 带①去 18.分式方程
=--11x x )
2)(1(+-x x m 有增根,则m 的值为( ) A 0和3 B 1 C 1和-2
D 3
19.(2012江苏苏州)若3×9m
×27m
=311
,则m 的值为( )
20. (2012山东东营)若43=x ,79=y
,则y x 23-的值为( )
A .74
B .47
C .3-
D .72
三、解答与证明
21、(2012呼和浩特)先化简,再求值:21(1)(2)x x x ++÷+,其中3
2
x =-
23、(2009年齐齐哈尔市)某电脑公司经销甲种型号电脑,受经济危机影响,电脑价格不断下降.今
年三月份的电脑售价比去年同期每台降价1000元,如果卖出相同数量的电脑,去年销售额为10万元,今年销售额只有8万元.
(1)今年三月份甲种电脑每台售价多少元?
(2)为了增加收入,电脑公司决定再经销乙种型号电脑,已知甲种电脑每台进价为3500元,乙种电脑每台进价为3000元,公司预计用不多于5万元且不少于4.8万元的资金购进这两种电脑共15台,有几种进货方案?
(3)如果乙种电脑每台售价为3800元,为打开乙种电脑的销路,公司决定每售出一台乙种电脑,返还顾客现金a元,要使(2)中所有方案获利相同,a值应是多少?此时,哪种方案对公司更有利?
19、(2009桂林百色)在我市某一城市美化工程招标时,有甲、乙两个工程队投标.经测算:甲队单独完成这项工程需要60天;若由甲队先做20天,剩下的工程由甲、乙合做24天可完成.(1)乙队单独完成这项工程需要多少天?
(2)甲队施工一天,需付工程款3.5万元,乙队施工一天需付工程款2万元.若该工程计划在70天内完成,在不超过计划天数的前提下,是由甲队或乙队单独完成该工程省钱?还是由甲乙两队全程合作完成该工程省钱?
22.(2012•佳木斯)如图,方格纸中每个小正方形的边长都是单位1,△ABC的三个顶点都在格点上,结合所给的平面直角坐标系解答下列问题:
(1)将△ABC向右平移3个单位长度再2个单位长度,画出平移后的△A1B1C1;
(2)在(1)的条件下,列算式求出线段BC在平移过程中扫过的面积。
(3)将△A1B1C1沿x轴向下翻转180度,画出翻后的△A2B2C2
5. (2011四川重庆,19,6分)如图,点A 、F 、C 、D 在同一直线上,点B 和点E 分别
在直线AD 的两侧,且AB =DE ,∠A =∠D ,AF =DC .求证:BC ∥EF .
(2012南京市,19,8)如图,在Rt △ABC 中,∠ABC=900,点D 在BC 的延长线上,且BD=AB ,过点B 作BE ⊥AC ,与BD 的垂线DE 交于点E. (1)求证:△ABC ≌△BDE ;
(2)△BDE 可由△ABC 旋转得到,利用尺规作出旋转中心O (保留作图痕迹,不写作法)
E
D
C
B
A
29.(2010四川 泸州)如图,已知AC ∥DF ,且BE =CF . (1)请你只添加一个..条件,使△ABC ≌△DEF , 你添加的条件是 ; (2)添加条件后,证明△ABC ≌△DEF.
22如图,,AB AC AD BC D AD AE AB DAE DE F =⊥=∠于点,,平分交于点,请你写出图中三对..
全等三角形,并选取其中一对加以证明.
13.(2010 甘肃)(8分)如图,BAC ABD ∠=∠.
(1)要使OC OD =,可以添加的条件为: 或 ;(写出2个符
合题意的条件即可)
(2)请选择(1)中你所添加的一个条件,证明OC OD =.
22(1)如图23(1),以ABC △的边AB 、AC 为边分别向外作正方形ABDE 和正方形
ACFG ,连结EG ,试判断ABC △与AEG △面积之间的关系,并说明理由。
(2)园林小路,曲径通幽,如图23(2)所示,小路由白色的正方形理石和黑色的三角形理石铺成.已知中间的所有正方形的面积之和是a 平方米,内圈的所有三角形的面积之和
是b 平方米,这条小路一共占地多少平方米?
23.(9分)如图:在△AB C 中,BE 、CF 分别是AC 、AB 两边上的高,在BE 上截取BD=AC ,在CF 的延长线上截取CG=AB ,连接AD 、AG . (1)求证:△ABD≌△GCA;
(2)请你确定△ADG 的形状,并证明你的结论.
D
O B A
B
D
C F A
郜
E F
B
(图1)
图
22。