八年级期末测试一1
2020-2021学年第一学期八年级物理期末试卷(1)
洛阳市2020—2021学年第一学期期末考试八年级物理试卷一、填空题1．在物理学习中我们认识了很多物理量和它们的国际单位，请仿照示例填写。
在国际单位制中速度的基本单位是m/s；________的基本单位是________。
2．教室内张贴有如图1所示的标志，倡导同学们不要大声喧哗。
“喧哗”是声带_____发出声音的；从声音的特性分析，“大声喧哗”是指声音的______大；从控制噪声的途径分析，这是从______处减弱噪声。
3．如图2所示，在测平均速度的实验中，斜面应保持很小的坡度，这样设计是为了便于测量________。
实验中，小车从斜面顶端自由滑到底部的过程中，上半程的平均速度________（选填“大于”、“小于”或“等于”）全程的平均速度。
4．如图3所示，在洛阳举办的2020央视中秋晚会呈现了一场绚丽的烟花盛宴，小亮在家里的窗台上观看远处的烟花，他会先________________（选填“听到响声”或“看到烟花”），这是因为________________________________。
5．冬天，对着手吹气感到冷；对着手呵气，会感到湿润，觉得暖和。
这是由于吹气加快了皮肤表面水分的_________（填写物态变化名称），需要_________（选填“吸收”或“放出”）热量；呵出的水蒸气遇到冷的手发生_______（填写物态变化名称），会______（选填“吸收”或“放出”）热量。
6．2020年6月21日，洛阳上空出现日偏食天文奇观。
日偏食是由于光的________形成的。
小刚用盆装上稀释后的墨水，从盆中水面观察到了如图4所示的像，该像是由光的________形成的太阳的________（选填“实”或“虚”像）；这个像比太阳暗很多，是由于阳光有一部分发生________进入水中。
7．如图5所示，在玻璃杯后适当位置放一张白纸，向杯子中倒入水后，可观察到左右两侧“黑白颠倒”的现象，这是由于倒入水后杯子相当于________镜。
人教版英语八年级上册期末测试卷1
期末测试卷时间：100分钟满分：120分第一卷听力部分(25分)一、听力测试(每小题1分，计25分)第一节。
听下面5个句子，从题中所给的A、B、C三个选项中选出与所听内容相符的图片。
1.2.3.4.5.第二节。
听下面5个句子，从题中所给的A、B、C三个选项中选择最佳答语。
6. A. Jim will be more outgoing.B. Linda will get advice from an expert.C. I'll talk to my friends.7. A. Let's have it today.B. Half of them won't come.C. They'll be happy.8. A. Thank you. B. That's right.C. Good idea.9. A. Sitcoms, of course.B. I like to watch TV.C. I can't stand talk shows.10. A. Bill is. B. Kate does.C. Eric did.第三节。
听下面5段小对话，每段对话对应一个小题，从题后所给的A、B、C三个选项中选出能回答所提问题的最佳选项。
11. Where did Andy go on vacation?A. To India.B. To Japan.C. To China.12. How is Mike feeling now?A. Sad.B. Excited.C. Happy.13. Who is lazy?A. Ellen.B. Susan.C. Ben.14. What kind of fruit do they need?A. Apples.B. Oranges.C. Bananas.15. What should the girl wear to the party?A. A dress.B. Jeans.C. A T-shirt.第四节。
2023年初中道法八年级上册第一学期期末测试卷(一)打印版含答案
2023年初中道法八年级上册第一学期期末测试卷（一）打印版含答案八年级·道德与法治上册(R版)时间：60分钟满分：100分一、选择题(每小题3分，共45分)1．浙江省杭州市富阳区富春第七小学的孩子们在传统节气芒种这天来到了渔山乡的水稻田里，跟农民伯伯们一起学插秧。
孩子们脱掉鞋袜，走进稻田，弯着腰，点着苗，有模有样。
这是富阳“新式劳动教育”实践中的一堂课。
开设这样的课程有利于鼓励学生()①脱离校园，在社会的大课堂中学习②积极投身社会实践，养成亲社会行为③在社会课堂中积极学习、健康成长④通过社会学习，成为合格的社会成员A．①②③B．①②④C．①③④D．②③④2．网络让“业务上云”成为可能。
生鲜电商、在线教育、远程办公等行业持续进行技术创新，着力保障防控期间人们的工作、生活有序开展，推动实施“居家能办公，停课不停学，停工不停产”。
这表明()①网络让我们的生活更加便利②网络可解决生活中的一切问题③生活的各个领域都需要创新④互联网提高了文化传播的速度A．①③B．②③C．①④D．③④3．一张女子坐在疑似客机驾驶舱内的照片在网上引发热议。
桂林航空经核实，决定对当事机长处以终身停飞的处罚。
这说明()①自由要受到社会规则的约束②违反规则应受到相应的处罚③遵守社会规则需他律和自律④社会规则保障社会秩序的实现A．①②③B．①③④C．②③④D．①②③④4. 下列选项是几位同学的行为表现，其中能够反映践行社会主义核心价值观中诚信价值准则的是()A．小雅同学经常帮助同学学习英语B．小硕同学在公共场所从不大声喧哗C．小林同学能积极参加每周的升旗仪式D．小博同学在考试中不弄虚作假5．在网络时代，“人人都是通讯社，个个都有麦克风”。
然而，要想通过“麦克风”发出“好声音”，还要练就“好嗓子”。
作为公民，要在网络世界练就“好嗓子”，就必须()①加强自我约束，放弃言论自由②合理利用网络，传播社会正能量③依法自由表达，正确行使权利④拒绝不良诱惑，彻底远离网络A．①②B．②③C．①④D．③④6．河南济源市人民法院判处了一起高空抛物案，被告人卫某某从20楼抛下电动车，法院最终以以危险方法危害公共安全罪判处其有期徒刑3年。
八年级期末物理试卷一
八年级（上）期末物理试卷一一、选择题（每小题3分，共30分）1．（3分）如图所示，小华将一只正在发声的音叉触及面颊有震感。
这个实验是用来探究（）A．声音产生的原因B．决定音调的因素C．声音能否在空气中传播D．声音传播是否需要时间2．（3分）如图所示，分别是甲、乙两种声音的波形图。
甲、乙两种声音（）A．响度相同B．音调相同C．音色相同D．音调、响度和音色均相同3．（3分）控制噪声污染可从三个方面着手：在声源处控制噪声；在传播途中控制噪声；在人耳处减弱噪声，下列事例中，属于在传播途中控制噪声的是（）A．发动机上装消声器B．工人戴耳罩C．午休时关闭门窗D．考场周围禁鸣喇叭4．（3分）如图所示，夏天打开冷库门存取食物时，看到冷库内冒出一股白雾，白雾是（）A．冷库内的冰遇热升华形成的B．冷库内的冰遇热熔化形成的C．空气中的水蒸气遇冷液化形成的D．空气中的水蒸气遇冷凝华形成的5．（3分）0℃气温下，把盛有碎冰块的试管插入烧杯里的碎冰块中，如图所示，用酒精灯对烧杯底部慢慢加热，当烧杯中的冰块有大半熔化时，试管中的冰将（）A．一点也不熔化B．熔化一部分C．全部熔化D．无法判断6．（3分）小明对甲、乙两种物质做凝固实验，得到温度﹣时间图象如图所示，下列分析中错误的是（）A．甲在第2min时是液态B．甲在ab段吸热C．甲的凝固点是48℃D．乙是非晶体7．（3分）在光色散实验的基础上，如果我们把温度计放在可见光区域外侧；红外光区域以及紫外光区域中，温度计的变化情况是（）A．把温度计放在红外光区域中，温度计的示数不变B．把温度计放在紫外光区域中，温度计的示数下降C．把温度计放在红外光区域中比放在紫外光区域中示数升高得快D．把温度计放在紫外光区域中比放在红外光区域中示数升高的快8．（3分）下列现象中，能用光的直线传播特点解释的是（）A．树荫下的圆形光斑B．照哈哈镜C．透过露珠看叶脉D．水中倒影9．（3分）如图所示，平面镜前甲、乙、丙处都放置有小灯泡。
人教版初中英语八年级下学期期末测试卷一
人教版初中英语八年级下学期期末测试卷一一. 单项填空。
1. Jane is16-year-old high school student in United States.A. a, theB. the, aC. a, /D. an, the 2. —I think —I agree dragons are the of China. with you.Do you think so? A. situation B. symbol C. promise D. shape3. —Are all the students from in your class? —No, there are only 3 in our class. The others are from other countries.A. Germany, GermenB. Germany, GermansC. German, GermansD. German, Germany4. My time in the middle school was one of periods of my life.A. excitingB. more excitingC. the more excitingD. the most exciting 5. Bob is always polite to everyone, and he islovelyall of us like him very much.A. too, toB. neither, norC. so, thatD. such, that 6. —What would you like, tea or coffee?— , thanks. I just prefer a glass of water. A. Both B. Neither C. Either D. So7. Come on, baby. We have already done of the work. A. two three B. two third C. two thirds D. second three8. —My cousin has a sore throat.—She’d better .A. drink water with honeyB. see a dentistC. take a showerD. get an X-ray9.—Come here, I’ll tell you about your study.—OK, we’re coming.A. anything importantB. something importantC. important anythingD. important something10.The less junk food you eat, you will be.A. the healthierB. healthierC. more healthyD. less healthy11.Mr. Brown his hometown since he the army.A. has left, joinedB. has been away from, has joinedC. has been away from, joinedD. left, joined12.Qomolangma is about 8, 844 meters high. It ismountain in the world.A. highestB. the highestC. higherD. the higher13.—my surprise, Jin Ming was chosen into our school football team.—Congratulations. He did well playing football when he was very young. I hope he’ll be the best player in our school.A. To, ofB. At, atC. To, inD. In, about14.—Mom, can I do much work in a short time?—Dear, I think you can.A. so, soB. such, soC. so, suchD. such, such15.—At what age did you leave home?—I left home at 18, Neil. I your city for fiveyears.A. have been inB. have been toC. have gone toD. have come to二. 完形填空。
人教版初中物理八年级上册期末测试题1(含答案)
人教版初中物理八年级上册期末测试题（含答案）一、单项选择题1．目前，人教版九年级物理课本的厚度最接近（）A．1cm B．10cm C．20cm D．50cm2．下面是某同学记录的中考体育测试的成绩，你认为数据符合实际的是（）A．男子立定跳远成绩为5.2mB．男子1000m长跑成绩为4'20”C．女子800m长跑成绩为40sD．女子仰卧起坐每秒30个3、锣发声的时候用手按住锣面，锣声就消失了，这是因为（）A．手吸收了声音B．锣面停止振动C．手反射了声音D．手不能传播声音4、如图是一款骨传导蓝牙耳机，将耳机贴在颞骨两侧而不是堵塞住耳朵，既可以听到耳机发出的声音，也不影响听到周围环境的声音。
耳机声和周围环境声音对应的传播介质分别是（）A．固体、固体B．气体、气体C．固体、气体D．气体、固体5、通常情况下正常人感觉较舒适的气温大约为（）A．-5℃B．0℃C．18℃D．35℃6、疫情期间，如图所示的体温计起到了重要的作用，关于该体温计，下列说法正确的是（）A．每次使用后必须用沸水消毒B．读数时不能离开人体C．分度值是 1℃D．根据液体热胀冷缩的原理制成7、如图所示，2022年北京冬奥会闭幕式上两个人在冰面上推着巨大的地球仪入场，在地球仪靠近光源的过程中，下列说法正确的是（）A．地球仪影子的形成与倒影的原理相同B．靠近光源过程中地球仪的影子变长C．靠近光源过程中地球仪的影子变短D．冰面发亮，是因为冰面也是光源8、要使小灯泡发出的光经某透镜后变成平行光，应把小灯泡放在（）A．凸透镜前任意位置 B．凹透镜前任意位置C．凹透镜的焦点上D．凸透镜的焦点上9、关于使用托盘天平的说法，正确的是（）A．测量时，物体要放在天平的右盘中B．必须使用镊子加减砝码，但可用手直接移动游码C．若开始测量前游码没有“归零”，测量结果将会偏大D．若在右盘放入质量最小的砝码后，指针偏向刻度盘左侧，应将平衡螺母向右调节10、小明想用天平称出20g水，先用正确的方法测出空烧杯的质量，如图1所示，然后在右盘中增加20g砝码，接着向烧杯中注入一定量的水，指针位置如图2所示。
(外研社版)八年级英语下册 期末测试题(一)附答案
八年级英语下册期末测试题（一）班次：姓名：得分：听力部分一、听句子或对话，选择意思相符的图片。
每个句子或对话读两遍。
1. What does Simon want to be?A. B. C.2. Where is Julie going for her holiday?A. B. C.3. Where did Bob get the news from?A. B. C.4. What does the girl want to be?A. B. C.5. What does the boy’s father do?A. B. C.二、听录音，选择相应的句子。
每个句子读两遍。
6.A. I go to work every day.B. I often go to the cinema with my boyfriend.C. Shops are open at weekends.7.A. What kind of computer is that?B. What language does she speak?C. What do you think of this computer?8.A. I got the highest score.B. I won the first prize.C. I failed the final exam.9.A. You’ll be late unless you leave now.B. Don’t be late for school next time.C. My brother is often late for school.10.A. I’m glad you like it.B. Don’t mention it.C. Here we are.三、听对话，选择正确的答案。
每段对话读两遍。
11. What does Molly like?A. Action movies.B. Talk shows.C. Sports shoves.12. What will Paul do this afternoon?A. Go to the park.B. Prepare for his math exam.C. Go to the concert.13. Where did the dialogue probably happen?A. In a street.B. In a shop.C. In a school.14. Who is the shortest of the three girls?A. Wu Na’s cousin.B. Wu Yu.C. Wu Na.15. What does the boy think the life will be in 100 years?A. There will be more water.B. There will be less pollution.C. There will be less water and more pollution.四、听短文，选择正确的答案。
浙教版2022-2023学年八年级上学期期末数学模拟测试卷(一)(解析版)
浙教版2022-2023学年八年级上学期期末数学模拟测试卷（一）（解析版）一、选择题（本大题有10小题，每小题3分，共30分）下面每小题给出的四个选项中，只有一个是正确的.1．下列四个图形中，不是轴对称图形的是（）A．B．C．D．【答案】C【解析】根据轴对称图形的意义可知：A、B、D都是轴对称图形，而C不是轴对称图形；故答案为：C.2．如果a>b，那么下列不等式中正确的是（）A．a−2>b+2B．a8<b8C．ac<bc D．−a+3<−b+3【答案】D【解析】∵a＞b，又∵不等式两边乘（或除以）同一个负数，不等号的方向改变，∴﹣a＜﹣b.又知不等式两边加（或减）同一个数（或式子），不等号的方向不变，所以正确的是−a+3<−b+3.故答案为：D.3．下列条件中，能判断两个直角三角形全等的是（）A．有两条边分别相等B．有一个锐角和一条边相等C．有一条斜边相等D．有一直角边和斜边上的高分别相等【答案】D【解析】A.两边分别相等，但是不一定是对应边，不能判定两直角三角形全等，故此选项不符合题意；B.一条边和一锐角对应相等，不能判定两直角三角形全等，故此选项不符合题意；C.有一条斜边相等，两直角边不一定对应相等，不能判定两直角三角形全等，故此选项不符合题意；D.有一条直角边和斜边上的高对应相等的两个直角三角形全等，故此选项符合题意；故答案为：D.4A．在这个变化中，自变量是温度，因变量是声速B．温度越高，声速越快C．当空气温度为20℃时，声音5s可以传播1740mD．当温度每升高10℃，声速增加6m/s【答案】C【解析】∵在这个变化中，自变量是温度，因变量是声速，∴选项A符合题意；∵根据数据表，可得温度越高，声速越快，∴选项B符合题意；∵342×5=1710(m)，∴当气温为20∘C时，声音5s可以传播1710m，∴选项C不符合题意；∵324−318=6(m/s)，330−324=6(m/s)，336−330=6(m/s)，342−336=6(m/s)，∴当温度每升高10∘C，声速增加6m/s，∴选项D符合题意.故答案为：C.5．在平面直角坐标系中，已知点A （﹣2，a ）和点B （b ，﹣3）关于y 轴对称，则ab 的值（ ） A ．﹣1 B ．1 C ．6 D ．﹣6 【答案】D【解析】∵点A （-2，a ）和点B （b ，-3）关于y 轴对称，∴a=-3，b=2，∴ab=-3×2=-6. 故答案为：D.6．如图，函数y =2x 和y =ax +4的图象相交于点A(32，3)，则不等式2x <ax +4的解集为（ ）A ．x <32B ．x <3C ．x >32D ．x >3【答案】A【解析】根据函数图象得，当x <32时，2x <ax +4．故答案为：A.7．如图，∠1+∠2+∠3+∠4+∠5+∠6+∠7=（ ）A ．480°B ．500oC ．540oD ．600o【答案】C【解析】如图，由四边形的内角和得，∠2+∠3+∠5+∠8=360°，∠6+∠7+∠9+∠10=360°， ∴∠2+∠3+∠5+∠8+∠6+∠7+∠9+∠10=720°， ∵∠8+∠9=180°，∠10=∠1+∠4，∴∠1+∠2+∠3+∠5+∠8+∠6+∠7=720°−180°=540°. 故答案为：C. 8．如图，在等腰 △OAB 中， ∠OAB =90° ，点 A 在 x 轴正半轴上，点 B 在第一象限，以 AB 为斜边向右侧作等腰 Rt △ABC ，则直线 OC 的函数表达式为（ ）A ．y =12xB ．y =13xC ．y =14xD ．y =15x【答案】B【解析】设 OA =a ，∵△OAB 是等腰三角形，且 ∠OAB =90°∴AB =OA =a在等腰 Rt △ABC 中， AC =BC,∠BAC =45° ，由勾股定理得 AC =√22a作 CD ⊥x 轴交于点D ，则 ∠CAD =180°−∠OAB −∠CAB =45°∴ΔACD 是等腰直角三角形∴AD =CD由勾股定理得 CD 2+AD 2=AC 2 ，即 2CD 2=AC 2=(√22a)2=12a 2 ，∴CD =AD =12a ∴OD =OA +AD =32a∴C(32a,12a)设直线 OC 的函数表达式为 y =kx ，将点C 坐标代入得 12a =k ·32a解得 k =13所以直线 OC 的函数表达式为 y =13x故答案为：B9．如图， Rt △AED 中，∠AED =90∘，AB =AC =AD ，EC =3，BE =11，则ED 的值为（ ）A ．√33B ．√34C ．√35D ．√37−1【答案】A【解析】如图：过A 作AF ⊥BC 垂足为F∵EC =3，BE =11∴BC =BE +EC =11+3=14 ∵AB =AC ，∴BF =CF =12BC =7∴EF =FC −EC =7−3=4在Rt △ADE 中，由勾股定理得，DE 2=AD 2−AE 2， 在Rt △AEF 中，由勾股定理得，AE 2=AF 2+EF 2 又∵AB =AD ，∴DE 2=AB 2−(AF 2+EF 2)在Rt △ABF 中，由勾股定理得：AB 2=AF 2+BF 2∴DE 2=AF 2+BF 2−(AF 2+EF 2)=BF 2−EF 2=72−42=33故答案为：A.10．如图，在△ABC中，AC=BC，AD平分∠BAC交BC于点E，过点D作DM⊥AB于点M，连接CD，下列结论正确的是（）A．若∠ACB=90°，则AC+CE=ABB．若AB+AC=2AM，则∠ACD+∠ABC=180°C．若DE=DB，则∠ACB=90°D．过点C作CH⊥AD于点H，则DA−DB=2DH【答案】A【解析】A、如图1中，作EF⊥AB于F．∵∠ACB=90°，AC=CB，∴∠ABC=45°，∵EF⊥AB，∴∠FEB=∠EBF=45°，∴EF=BF，∵∠EAC=∠EAF，∠ACE=∠AFE，AE=AE，∴ΔAEC≅ΔAEF(AAS)，∴AC=AF，EC=EF，∴AC+CE=AF+EF=AF+BF=AB，故A符合题意；B、如图2中，作DG⊥AC于G．同理可知ΔADG≅ΔADM(AAS)，∴AM=AG，DG=DM，∵AC+AB=AG−CG+AM+BM=2AM，∴CG=BM，∵∠DGC=∠DMB=90°，∴ΔDGC≅ΔDMB(SAS)，∴∠DCG=∠DBM，∵∠DCG+∠ACD=180°，∴∠ACD+∠ABD=180°，故B不符合题意．∴点D 在线段BE 的垂直平分线上，当∠ACB ≠90°时，也能找到这样的点D ． 故C 不符合题意；D 、如图3中，在HA 上取一点N ，使得HN =DH ，欲证明DA −DB =2DH ，只要证明AN =BD ，只要证明ΔACN ≅ΔBCD 即可．由于缺少条件无法证明ΔACN ≅ΔBCD ，故D 不符合题意， 故答案为：A ．二、填空题（本大题有6小题，每小题4分，共24分）要注意认真看清题目的条件和要填写的内容，尽量完整地填写答案.11．在直角坐标系中，点P （﹣2，3）向右平移3个单位长度后的坐标为 ． 【答案】（1，3）【解析】平移后点P 的横坐标为﹣2+3＝1，纵坐标不变为3； ∴点P （﹣2，3）向右平移3个单位长度后的坐标为（1，3）． 故答案为：（1，3）．12．如图，用纸板挡住部分直角三角形后，能画出与此直角三角形全等的三角形，其全等的依据是 ．【答案】ASA【解析】由图得：遮挡住的三角形中露出两个角及其夹边． 则能画出与此直角三角形全等的三角形，其全等的依据是ASA. 故答案为：ASA.13．满足不等式2(2x −4)>−3x +6的最小整数是 ． 【答案】3【解析】不等式去括号得：4x −8>−3x +6， 移项得：4x+3x ＞6+8， 合并得：7x ＞14，把x 系数化为1得：x ＞2， 则不等式的最小整数为3. 故答案为： 3. 14．如果直线y ＝12x ＋n 与直线y ＝mx －1的交点坐标为（1，－2），那么m ＝ ，n ＝ ． 【答案】－1；－52【解析】将点（1，－2）代入y ＝12x ＋n 得-2＝12×1＋n 解得n=－52将点（1，－2）代入y ＝mx －1得 -2＝m×1－1 解得m=-1故答案为：-1；－52．15．如图，△ABC 中，AB ＝AC ，点D 为BC 的中点，∠BAD ＝24°，AD ＝AE ，∠EDC ＝ 度．【答案】12【解析】∵AB =AC ，点D 为BC 的中点，∠BAD =24°， ∴∠CAD =∠BAD =24°，AD ⊥BC ， ∵AD =AE ，∴∠ADE =∠AED =12×(180°−24°)=78°， ∴∠EDC =90°−∠ADE =12°， 故答案为：12． 16．如图，已知点A(2，2)，点B 在y 轴的负半轴上，点C 在x 轴正半轴上，AB ⊥AC ，且AB =AC.则OC −OB 的值为 ．【答案】4【解析】如图，过点A 作AD ⊥y 轴于D ， AE ⊥x 轴于E ， ∴AD =AE =2 ， ∠ADO =∠AEO =90° ， ∵∠DOE =90° ，∴∠ADO =∠AEO =∠DOE =90° ， ∴ 四边形ADOE 为正方形，∴OD =OE =2 ， ∠DAE =90° ， ∵AB ⊥AC ， ∴∠BAC =90° ， ∴∠DAB =∠EAC ， ∵AB =AC ，∴△ADB ≌△AEC （SAS ） ， ∴BD =CE ，∴OC −OB =OE +CE −OB =OE +BD −OB =OE +OB +OD −OB =OE +OD =4 ， 故答案为：4.三、解答题（本题有8小题，第17～19题每题6分，第20、21题每题8分，第22、23题每题10分，第24题12分，共66分）解答应写出文字说明，证明过程或推演步骤.17．解下列不等式(组)，并把解集在数轴上表示出来． （1）2+x 4≥2x−13；（2）{2x −4<012(x +8)−2>0．【答案】（1）解：2+x 4≥2x−13去分母：3(2+x)≥4(2x −1)，去括号得：6+3x ≥8x −4，3x −8x ≥−4−6 −5x ≥−10解得x ≤2在数轴上表示，如图，（2）解：{2x −4<0①12(x +8)−2>0② 解不等式①得：x <2 解不等式②得：x >−4 在数轴上表示，如图，∴不等式组的解集为：−4<x <218．如图，在△ABC 中，已知其周长为26㎝.（1）在△ABC 中，用直尺和圆规作边AB 的垂直平分线分别交AB 、AC 于点D ，E （不写作法，但须保留作图痕迹）.（2）连接EB ，若AD 为4㎝，求△BCE 的周长. 【答案】（1）解：如图所示：D ，E 即为所求；（2）解：∵DE 垂直平分AB ， ∴AD=BD=4cm ，AE=BE ，∴△BCE 的周长为：EC+BE+BC=AC+BC=26-AB=26-8=18（cm ）.19．如图，在ΔABC 中，AD 是BC 边上的高线，CE 是AB 边上的中线，DG ⊥CE 于 G ，CD =AE ．（1）求证：CG =EG ；（2）已知BD =6，CD =5， 求ΔCDG 面积． 【答案】（1）证明：连接DE ，如图所示，∵AD ⊥BC ， ∴∠ADC =90°，∵CE 是AB 边上的中线， ∴点E 是AB 中点， ∴DE =AE =BE ， ∵CD =AE ， ∴DE =CD ， ∵DG ⊥CE ， ∴CG =EG ．（2）解：∵CE 是AB 边上的中线， ∴AE =BE ，∵BD =6，CD =5∴AB =10，∴AD =√102−62=8，∴S ΔABC =12×11×8=44，S ΔABD =12×6×8=24， ∵CE 是AB 边上的中线，∴S ΔBEC =12S ΔABC =22， ∵DE 是AB 边上的中线，∴S ΔBDE =12S ΔABD =12，∴S ΔEDC =S ΔBEC −S ΔEDB =22−12=10， 又∵CG =EG ，∴S ΔCDG =12S ΔEDC =5． 故ΔCDG 面积为5．20．如图，∠ACB =90°，AC =BC ，AD ⊥CE ，BE ⊥CE ，垂足分别为D 、E ，CE 交AB 于点F ．（1）求证：BE =CD ．（2）若∠ECA =75°，求证：DE =12AB ．【答案】（1）证明：∵∠ACB ＝90°，AD ⊥CE ，BE ⊥CE ， ∴∠ACD ＋∠BCE ＝90°，∠ACD ＋∠CAD ＝90°，∠ADC ＝∠CEB ＝90°， ∴∠BCE ＝∠CAD ，在△ADC 和△CEB 中，{∠ADC ＝∠CEB∠CAD ＝∠BCE AC ＝BC，∴△ADC ≌△CEB （AAS ）， ∴BE ＝CD ；（2）证明：∵∠ECA ＝75°，∴∠CAD ＝90°－75°=15°＝∠BCE ，∵∠ACB ＝90°，AC ＝BC ， ∴∠CBA ＝∠CAB ＝45°， ∴∠BFE ＝60°，∠DAF ＝30°，∴∠FBE ＝30°，DF ＝12AF ，∴EF ＝12BF ，∴DE ＝DF ＋EF ＝12（AF ＋BF ）＝12AB ．21．已知点P(3a −15，2−a)．（1）若点P 位于第四象限，它到x 轴的距离是4 ， 试求出a 的值： （2）若点P 位于第三象限且横、纵坐标都是整数， 试求点P 的坐标． 【答案】（1）解：∵点P 位于第四象限，它到x 轴的距离是4 ， ∴2−a =−4， 解得：a =6（2）解：∵点P 位于第三象限且横、纵坐标都是整数， ∴{3a −15<02−a <0，解得：2<a <5，∴a =3时，点P 的坐标为(−6，−1)， 当a =4时，点P 的坐标为(−3，−2)，综上，点P 的坐标为(−6，−1)或(−3，−2)． 22．在一次课外兴趣活动中，有一半学生学数学． 四分之一学生学音乐， 七分之一学生学英语， 还有部分人在操场上踢球， 若参加这次课外兴趣活动共有学生m 人． （1）请用含m 的代数式表示在操场上踢球的人数．（2）若还剩下不到6名学生在操场上踢球，试问参加这次课外兴趣活动共有学生多少人？ 【答案】（1）解：因为有一半学生学数学． 四分之一学生学音乐， 七分之一学生学英语，所以操场上踢球的人数为：m −12m −14m −17m =328m （人）．（2）解：根据（1）得操场上踢球的人数为328m ，因为剩下不到6名学生在操场上踢球， 所以328m ＜6，解得m ＜56因为m 是2、4、7公倍数， 所以m =28，故这次课外兴趣活动共有28名学生．23．随着春节临近，某儿童游乐场推出了甲、乙两种消费卡，其中，甲为按照次数收费，乙为收取办卡费用以后每次打折收费．设消费次数为x 时，所需费用为y 元，且y 与x 的函数关系如图所示．根据图中信息，解答下列问题．（1）分别求出选择这两种卡消费时，y 关于x 的函数表达式； （2）求出入园多少次时，两者花费一样？费用是多少？ （3）洋洋爸准备了240元，请问选择哪种划算？ 【答案】（1）解：设y 甲=k 1x根据题意得4k 1=80，解得k 1=20， ∴y 甲=20x ；设y 乙=k 2x +80，根据题意得：12k 2+80=200， 解得k 2=10，∴y 乙=10x +80； （2）解：解方程组{y =20x y =10x +80， 解得：{x =8y =160，∴E 点坐标(8，160)；即出入园8次时，两者花费一样，费用为160元， （3）解：洋洋爸准备了240元，根据图象和（2）的结论可知：当y >160时，乙消费卡更合适．24．如图，在平面直角坐标系中，函数y =−x +2的图象与x 轴，y 轴分别交于点A ，B ，与函数y =13x +b 的图象交于点C(−2，m)．（1）求m 和b 的值；（2）函数y =13x +b 的图象与x 轴交于点D ，点E 从点D 出发沿DA 方向，以每秒2个单位长度匀速运动到点A （到A 停止运动）．设点E 的运动时间为t 秒． ①当△ACE 的面积为12时，求t 的值；②在点E 运动过程中，是否存在t 的值，使△ACE 为直角三角形？若存在，请求出t 的值；若不存在，请说明理由． 【答案】（1）解：∵点C(−2，m)在直线y =−x +2上， ∴m =−(−2)+2=4， ∴点C(−2，4)，∵函数y =13x +b 的图象过点C(−2，4)，∴4=13×(−2)+b ，解得b =143，即m 的值是4，b 的值是143；（2）解：①∵函数y =−x +2的图象与x 轴，y 轴分别交于点A ，B ， ∴点A(2，0)，点B(0，2)，∵函数y =13x +143的图象与x 轴交于点D ，∴点D 的坐标为(−14，0)， ∴AD =16，∵△ACE 的面积为12， ∴(16−2t)×42=12，解得，t =5．即当△ACE 的面积为12时，t 的值是5；②存在，当t ＝4或t ＝6时，△ACE 是直角三角形，理由如下： 第一种情况：当∠CEA =90°时， ∵AC =4√2，∠CAE =45°， ∴AE =4，∵AE =16−2t ， 即4=16−2t ， 解得，t =6；第二种情况：当∠ACE=90°时，AC⊥CE，∵点A(2，0)，点B(0，2)，点C(−2，4)，点D(−14，0)，∴OA=OB，AC=4√2，∴∠BAO=45°，∴∠CAE=45°，∴∠CEA=45°，∴CA=CE=4√2，∴AE=8，∵AE=16−2t，即8=16−2t，解得：t=4；综上所述，当t=4或t=6时，△ACE是直角三角形。
冀教版英语八年级上册期末测试卷 1
期末测试限时: 100分钟满分: 120分一、听句子, 选出句子中所包含的信息, 每个句子读两遍(每小题1分, 共5分)1. A. scientist B. artist C. tourist2. A. last choice B. first choice C. best choice3. A. turn out B. blow out C. put out4. A. I don't feel tired.B. Let's go out together.C. I can't go out with you.5. A. John has many questions.B. John has one more question.C. John answers a question.二、听句子, 选出所听句的最佳答语, 每个句子读两遍(每小题1分, 共5分)6. A. Yes, I know. B. Thank you. C. I think so.7. A. Yes, you can. B. Let's go. C. You can take Bus No. 5.8. A. Thanks a lot. B. Me, too. C. You're right.9. A. Last year. B. For a year. C. In two days.10. A. Good luck. B. Thank you. C. Well done.三、听对话和问题, 选择正确答案, 对话和问题读两遍(每小题1分, 共8分)11. What's the girl's favourite subject?A. B. C.**********************12. Where is the woman going?A. B. C.**********************13. Where can the transportation travel?A. On the river.B. In the air.C. On the land.**********************14. Where are they talking?A. In the park.B. In the zoo.C. In the garden.15. What is the woman good at?A. Drawing.B. Dancing.C. Growing flowers.**********************16. What is Lily doing?A. She is taking pictures.B. She is reading books.C. She is looking at her stamps.17. What does John think of Lily's stamps?A. They are beautiful.B. They are special.C. They are lucky.18. Who is interested in playing the piano?A. Lily.B. John.C. Both Lily and John.四、听短文和问题, 选择正确答案, 短文和问题读两遍(每小题1分, 共7分)19. How do most students get to school?A. On foot.B. By bike.C. By bus.20. Why do many students walk to school?A. Because they live near the school.B. Because it is good for their health.C. Because they don't have bikes.21. Who bought a bike for the speaker?A. His mother.B. His grandfather.C. His father.**********************22. How old is Liu Yang this year?A. 12.B. 13.C. 14.23. Where did they go first?A. To the park.B. To the restaurant.C. To the beach.24. When did they have the birthday party?A. In the morning.B. At noon.C. In the evening.25. What did they eat at the birthday party?A. A cake.B. Noodles.C. Rice.五、听短文填空, 短文读两遍(每小题1分, 共5分)笔试部分(90分)六、单项选择(每小题1分, 共10分)31. My daughter is interested ________ drawing.A. toB. inC. forD. with32. You did so well in the exam. I feel very ________.A. proudB. tiredC. worriedD. bored33. Nobody teaches Mary English. She teaches________ .A. herB. herselfC. sheD. hers34. Whenever I failed to do something, my mother ________me ________have a tryagain.A. lets; toB. advised; toC. made; toD. makes; to35. It's about ________ walk from my home to the post office.A. ten minuteB. ten minutesC. ten minute'sD. ten minutes'36. Of all the subjects, I think Chinese is ________.A. easyB. easierC. easilyD. the easiest37. Sue felt very sad ________ she lost her best friend.A. thoughB. becauseC. soD. until38. —I'd like to buy a new oven.—The ones over there sell well. You can ________ one by one to have a try.A. turn on itB. turn it onC. turn on themD. turn them on39. Since 1990, Project Hope ________ millions of students from poor familiesrealize their dreams.A. will helpB. has helpedC. helpsD. helped40. Not only my brother but also my good friend John ________ swimming lovers.A. amB. isC. areD. were七、完形填空(每小题1分, 共10分)My parents used to tell me how important school was for me, but I didn’t think so.I paid little attention. But one thing let me________41 realize what my parents meant.One day, when I walked past a mobile phone store, I saw it was hiring(雇用)new workers! I went into the________42 and asked for the job. The manager looked at me for a few seconds ________43. “Do you have a High School diploma(毕业文凭)? ”he said. “Or do you have any________44experience? ” I felt so ashamed (羞愧的) and left.I coul d not fall asleep that night, and I thought a lot about my ________45. “I must go to school to ________46 my study because I can’t do anything without agood education, ” I said to myself.Everything looked ________47 when I went back to the store years later: the same people and the same design. However, I felt more ________48 this time. The manager told me they needed new workers. I showed my diploma. He looked at it and said, “Great! You are ________49. ”Education helps you have a bright future. Now I am not worried about my future because I’m still ________50 in my spare time.41. A. finally B. easily C. luckily D. fast42. A. school B. store C. company D. supermarket43. A. in a hurry B. from head to footC. sooner or laterD. from time to time44. A. learning B. life C. teaching D. work45. A. parents B. friends C. future D. study46. A. continue B. begin C. stop D. change47. A. the same B. different C. friendly D. fresh48. A. excited B. surprised C. confident D. happy49. A. out B. in C. up D. down50. A. working B. driving C. running D. learning八、阅读理解(每小题2分, 共30分)阅读A、B、C、D四篇材料, 然后从各小题所给的四个选项中选出最佳选项。
浙江杭州市2022-2023学年八年级数学上学期期末模拟测试卷(一)含答案与解析
杭州市2022~2023学年上学期期末模拟测试卷（一）八年级数学（时间：100分钟满分：120分）学校:___________姓名：___________班级：___________考号：___________一、选择题（本大题共10小题，每小题3分，共30分。
在每小题所给出的四个选项中，恰有一项是符合题目要求的，请将正确选项前的字母代号填涂在答题卡相应位置上）1．若点A（m，n）在第三象限，那点B（﹣m+2，n﹣1）在（）A．第一象限B．第二象限C．第三象限D．第四象限2．已知三角形的一边长为8，则它的另两边长分别可以是（）A．4，4B．17，29C．3，12D．2，93．若a＞b，则下列不等式不一定成立的是（）A．a+3＞b+3B．＞C．＞D．﹣3a＜﹣3b4．如图，在△ABC中，∠A＝55°，∠B＝45°，那么∠ACD的度数为（）A．110B．100C．55D．455．已知第二象限的点P（﹣4，1），那么点P到x轴的距离为（）A．1B．4C．﹣3D．36．若一次函数y＝2x+1的图象经过点（﹣3，y1），（4，y2），则y1与y2的大小关系是（）A．y1＜y2B．y1＞y2C．y1≤y2D．y1≥y27．已知两个一次函数y＝kx+5和y＝2x+1的图象交于A（m，3），则一次函数y＝kx+5的图象所在的象限为（）A．一、二、三象限B．一、二、四象限C．一、三、四象限D．二、三、四象限8．已知正比例函数y＝kx（k≠0）的图象中，y随x的增大而减小，则一次函数y＝kx﹣k的图象大致是（）A．B．C．D．9．如果关于x的不等式ax＜﹣a的解集为x＞﹣1，那么a的取值范围是（）A．a＜0B．a＞0C．a＜1D．a＞110．如图，四边形ABCD中，AC、BD是对角线，△ABC是等边三角形，∠ADC＝30°，AD＝4，BD＝6，则CD的长为（）A．B．4C．D．二、填空题（本大题共6小题，每小题4分，共24分。
天津市和平区九十中学2022-2023学年八年级上学期期末物理测试(1)
九十中学2022-2023学年第一学期期末考试八年级--物理试卷一、单选题（本大题共10小题，共30.0分）1.联合收割机正将收割的稻谷放入拖拉机中；空中加油机正在给战机加油。
对这两幅图解释错误的是()A.以拖拉机为参照物，联合收割机是静止的B.以空中加油机为参照物，战机是静止的C.选择的参照物不同，同一物体的运动情况一定不同D.以地面为参照物，拖拉机、联合收割机、空中加油机都是运动的2.下列关于声的说法中正确的是()A.“禁止鸣笛”是阻断噪声传播B.声音在气体和液体中的传播速度相同C.“低声细语”中的“低”是指声音的响度小D.超声波粉碎人体内“结石”说明声波能传递信息3.如图所示，水的三态之间转化过程所对应的物态变化名称，标注都正确的是()A. B.C. D.4.毛泽东《沁园春长沙》中的诗句“鹰击长空，鱼翔浅底，万类霜天竞自由”，为我们展示了一副雄鹰在广阔的天空里飞，鱼儿在清澈的水里游荡，万物都在秋光中争着过自由自在的生活的美丽场景。
关于此诗句所描述的场景说法正确的是()A.清澈的水底看上去要比实际位置更深B.在岸上看到水中的鱼儿是光的折射形成的虚像C.雄鹰展翅高飞时，在平静水面形成的像将变小D.在清澈平静的水面看到蓝天白云的倒影是光的折射形成的5.如图，手机扫描二维码，相当于给二维码拍了一张照片，手机摄像头相当于凸透镜，影像传感器相当于光屏，下列说法正确的是()A.物体上的二维码是光源B.扫码时二维码要位于摄像头二倍焦距以外C.要使屏幕上二维码的像变小，只需将二维码靠近凸透镜D.影像传感器上成的是正立的实像6.估测在实际生活中的应用十分广泛，下列所估测的数据中最接近实际的是()A.人体的正常体温约为38.5℃B.普通住宅的层高约为1.5C.人正常心跳一次的时间约为60D.一枚鸡蛋的质量约为507.如图为甲、乙两种物质的−图像，下列说法正确的是()A.甲物质的密度与质量成正比B.体积为10B3的乙物质的质量为10C.甲物质的密度比乙的密度大D.甲、乙质量相同时，甲的体积是乙的2倍8.有四个容量均为200m的瓶子，分别装满酱油、纯水、植物油和酒精，那么装的质量最多的是(酱油>纯水>植物油>酒精)()A.纯水B.酱油C.酒精D.植物油9.关于踢足球涉及的力学知识，下列说法不正确的是()A.脚对足球施力时，足球对脚没有力的作用B.足球受力发生形变，说明力可以改变物体的形状C.足球受力由静止变为运动，说明力可以改变物体的运动状态D.用力越大，足球运动得越远，说明力的作用效果与力的大小有关10.现有铅球、铁球和铝球各一个，质量分别是铅，铁，铝，已知铅>铁>铝.下列说法正确的是：()A.如果三个球都是实心的，则铅<铁<铝B.如果三个球都是实心的，且质量相等，将它们分别浸没于放在同一水平面上的三只相同量筒的水中后(水未溢出)，量筒水面相平，则原来装水最少的量筒中放入的是铅球。
仁爱英语八年级上册期末测试(一)
期末测试（一）(考试时间：100分钟, 满分：120分)第一部分听力（25分）Ⅰ. 听句子，选择正确图片。
每个句子读一遍。
(5分)1. ________2. ________3. ________4. ________5. ________Ⅱ. 听句子，选择正确答语。
每个句子读两遍。
（15分）( )6. A. Yes, you can. B. No, thanks. C. No, you needn’t.( )7. A. I think so. B. I am afraid I can’t. C. See you.( )8. A. Animals. B. Animals or plants. C. Yes, I prefer animals.( )9. A. She was singing. B. He was visiting a museum. C. He played football.( )10. A. I’m sorry to hear that. B. Great.C. Never mind.Ⅲ. 听对话，选择正确答案。
每组对话读两遍。
（5分）( )11. A. Because the air in the countryside is fresher.B. Because he wants to visit his grandparents.C. Because many people go there.( )12. A. Yes, she does. B. No, she doesn’t. C. We don’t know.( )13. A. They’re beautiful. B. Animals live there.C. They are becoming smaller and smaller.( )14. A. Meat. B. Bamboo. C. Tomatoes.( )15. A. We should keep calm first.B. We should jump off a window.C. We should run here and there.Ⅳ. 听短文，选择正确答案。
人教八年级下册英语期末测试卷(一)(含听力+答案)
人教八年级下册英语期末测试卷〔一〕时间：120分钟总分值：120分听力局部〔分〕I.听句子,选择正确的答语.听一遍.(5分)( )1. A. Yes, I would. B. No, I don't. C. OK,I'll do it at once.( )2. A. I was using the Internet. B. Yes, I was. C. I used the Internet.( )3. A. Yes, I've been there twice. B. Yes, I'm going. C. Yes, I did.( )4. A. He's gone to the library. B. He will go to the library.C. He's been to the library.( )5. A. Yes, please. B. You are so kind. C. No I can't. II.听对话及问题,选择正确的答案.听两遍. (5分) ( )6. A. Eric's mother. B. Eric's father. C. Eric. ( )7.A.At 9:30 a.m. B.At 10:30 a.m. C.At 11:00 a.m. ( )8.A. She has a sore back. B. She has a headache.C. She has a sore throat.( )9. A. Does the dishes. B. Sweeps the floor. C. Takes out the rubbish.( )10. A.Sarah B.Ben. C. Tina.田.听两段对话,选择正确的答案.听两遍.(5分) 听第一段对话,答复第11〜12小题.)11. Where have the twins been?A. To Paris.B.To Sydney.C. To New York. ( )12. How long have the twins been there?A. For a week.B. For a month.C. For two months.听第二段对话,答复第13〜15小题.( )13. Thomas is for vacation.A. going to visit the Great WallB. going to do chores at homeC. going bike riding( )14. Rose has to stay at home for a few days because .A. her parents both workB. her parents have no moneyC. she is tired( )15. Rose is going to Beijing with .A. her friendsB. her cousinsC. her parentsIV.听短文,选择正确的答案.听两遍.(10分)( )16. The man wanted to take a little rest because .A. he was hungryB. it was very hotC. it was cool in the forest( )17. The man shouted at the monkeys, but the little monkeys could nA.seeB.hearC. understand( )18. After the man threw his hat onto the ground, all the monkeys _____ .ughed and made facesB. jumped off the treeC. threw their hats down( )19. In the end the man picked up all his hats and .A. went homeB. went to townC. went to the forest( )20. This interesting story tells us about .A. monkeys and a man with hatsB. how to teach monkeys to wear hatsC. a man and his monkey笔试局部(95分) D. 单项选择.(15分)A. Have a good timeB. You are unluckyC. I want to go, tooD. I'm sorry to hear that( )26. -Excuse me. Where is Mr Smiths office?-He isn't here now. He here for almost one year.A. doesn't workB. didn't workC. hasn't workedD. won't work)27.-I will take my computer test tomorrow.______ .A. I'm sorry to hear thatB. That's OKC. Good luckD. Congratulations)28. I can't believe ______ a little girl can read many books.A.such; soB.such; suchC.so; suchD.so; so)29.-Did your father agree with you?-He was ______ my plan. He thought it was not safe for a girl to travel alone.A.aboutB.withC.forD.against)30. He has ______ daughter _______ Mary.A.a eight years old; nameB. a eight-year-old; namingC.an eight-years-old; namedD. an eight-year-old; named)31. She didnt call me ,she wrote an e-mail to me.( )25. I'm going to spend my winter vacation with my parents in Hainan.( )21.(江苏苏州中考)In North America, meat eaters are bears and (mountain lions. They eat smaller animals such as rabbits and mice.A.smallestB. the smallestC. largestD. the largest( )22. -Who often helps you ______ your English?-My grandfather . ( A.with; does B.studying; helpsC. with; doD. to study; helps ( ( )23.-Could you please buy __________ drinks and snacks?- .I have no timeA.some; SureB.any; SorryC. some; SorryD. any; Yes ( ( )24. Please stop talking. Our teacher has _____ to tell us.A.something importantB. important somethingC. anything importantD.much important (( )32.(安徽中考)I will meet Jane at the station. Please ______ what time she willarrive.A.countB. chooseC. checkD. catch( )33. Mary with her parents ________ to the UK. They back in three weeks.but only bird food. The bat would rather die of hunger than 42 bird food. When the boy noticed the bat getting thinner, he used the spoon to feed the bat bird food 43 the bat could be used to eating the bird food.Some days later, the bat managed to escape from the cage and 44 home. He began to hunt insects for food with other bats. Later he became strong and enjoyed his life 45 a bat.C.have been; comeD. have been; have come ( ( )34.(山东泰安中考)One of the best ways for people to keep healthy is to (good eating habit. (A.growB. developC. increaseD. find ( ( )35.-Could I your umbrella, Alice? ( -Of course. Here you are. (E. .完形填空.(10分) (There was once a bat 蝙蝠)that was too lazy to hunt insects. One day, he looked 36 ( a window and saw a bird in its cage. The bird was given all its food and water without ( having to do_2Z at all. So the bat decided to become a child pet. m.阅读理解.〔30分〕The bat flew to parks so that he could be seen by some 38 and taken home. However Nick put two big baskets of grapes on his donkey and went to the market to sell them.the bat was not as beautiful as some birds, and the children paid little attention艮少注意).A. ReallyB. HoweverC. InsteadD. Though the best and certainly the cleverest one. But when he wanted to eat, there was no in A.have gone; will come B.has gone; will come ( )36.A. between B.out C.across D.through)37. A. everything )38. A. animals )39. A.take)40. A. sad)41. A.looked)42.A.eat)43. A.because )44. A.returned )45. A. forB. somethingB.menB. keepB.lonelyB. feltB.eatingB. so thatB.leftB. likeC. anythingC.childrenC.regardC.coldC.soundedC.to eatC.unlessC. arrivedC. asD. nothingD. womenD. orderD.happyD. trainedD. eatenD.sinceD.moveD. toFinally, with good luck, he met a little boy who was willing to 39 him as a pet. other men there, and all of them had baskets of grapes. After lunch they went to sleep. The bat was 40 in his cage, in a warm and comfortable house.There he 41 like he was After some time,Nick began to take grapes out of the other mens baskets and putthem inAt midday it was very hot, so he stopped in the shade of a big tree. There were severalSuddenly, one of the men woke up and saw him. "What are you doing? " he said angrily.“Oh〞said Nick, “don worry about me. I am half mad(疯的),and I do a lot of strange things.Oh, really?〞 said the other man. Then why don't you take grapes out of your baskets and put them in somebody els e baskets? You did not understand me'. said Nick. I said that I was half mad, not quite mad.( )6. Nick went to the market _______ .A. to sell his donkeyB. to buy somethingC. to sell his grapesD. to find a job ( )47. Nick stopped .A. under a big treeB. near a big treeC. around a big treeD. in a big tree ( )48. As Nick was taking away the other men s grapes, one of the men .A.didn't see himB. saw him and got angryC. woke his fellows(同伴)upD. came to him ( )49. Nick said that he did a lot of strange things because .A. he was cleverB. he was quite madC. he was foolishD. he was half mad ( )50. In this story Nick was .C. a friendly manD.a clever manBEvery year hundreds of people try to climb the worlds highest mountain or walk through rainforests. Let's take a look at two of them. A mountain climber Do you know that more than 4, 000 people have climbed Qomolangma? Gerlinde Kaltenbrunner is one of them. She s one of the world s greatest climbers and has climbed all the mountains over 8,000 meters in the world. It s difficult to climb mountains in cold weather, but Gerlinde loves jt. She started to climb the mountains near her home as a teenager.An Amazon adventurerEd Stafford is the first person to walk along the Amazon River(亚马孙河).His journey took two years and four months. There are many dangerous animals,but Ed was only bitten(被咬)by small insects(昆虫).During his trip, Ed had to look for fruit or catch fish. Sometimes food was hard to find. So he asked the people of the rainforest for food and help.( )51. Gerlinde started mountain climbing when she .A. left schoolB. became a nurseC.was a teenagerD. finished the trip to Amazon ( )52. What does thehis. A. a selfish(自私的)man B.a mad manunderlined word "it" refer to?A. To climb all the mountains in the world.B. To climb mountains in cold weather.C. To be the worlds greatest climber.D. To climb Qomolangma( )53. What can we know from Eds journey along the Amazon River?A. It took four years and two months.B. It was cold in the rainforest.C. It was easy to find food.D. It was very dangerous.( )54. Ed might NOT see ______ in the rainforest.A.peopleB.planesC. fruitD. insects( )55. Which of the following is TRUE?A. Ed was once bitten by mice on his trip.B Gerlinde is the first person to climb Qomolangma.C. More than 4,000 people climb Qomolangma every year.D. Gerlinde has climbed all the mountains over 8,000 meters in the world.CKnown as the mother river by all the Chinese people. the Huanghe River(Yellow River) is the second longest river in China after the Changjiang River. It is 5,464 kilometers long. It starts from the Kunlun Mountains, northwestern Qinghai Province. It runs through nine provinces and flows to Bohai Sea in Shandong Province. The first appearance of the name"Yellow River" is in The Book of Han. The word "yellow" describes the color of the muddy water in the lower course 下游)of the river.根据以上短文内容,完成下面表格.VIII.用所给词的适当形式填空.(5分)61. You have made a (different) in the activity62. Jill's father used to (control) the company, but now he has retired.63. This is a specially (train) dog and it can do something for you64. Jack is the most popular student in his class because of his _______ (kind).65. (communicate)between parents and teenagers is important.X.根据对话内容,从下面方框中选出五个适当的句子补全对话, 其中有两项是多余的(10 分)A: Hello, what are you looking at?B: 66. I am planning to travel, so they sent me the these to cheer me up. 阅读短文,从方框中选择适当的词并用其正确形式填空, 使短文意思通顺、完整.A: That's nice. Look, this postcard is from Beijing. 67. B: Yeah, I' m sure it is. But Ii Wei says it's tiring to travel around the city. A:68. _____B: Let's see. That's from Peter. He went to London last summer and went inside Buckingham Palace, where the Queen of England lives.A. Oh, it would be fantastic. C: And this is a postcard of Bali Island. Paul was there last week. He said it s very peaceful.A:69. _____B: Um, this one. It's from Disneyland. It's so exciting. Td really love to go. A: 70. Maybe it could be a graduation present for you next year. B: Yes. You are right. I'll try.A. Just some postcards from friends.B. Why not talk about it with your parents?C. Where s this one from?D. How did he go there?E. That's a very interesting place to visit.F. Of all, which postcard do you like best?G. Who is he?X .词语运用.〔10分〕每词限用一次.方框中有两个词是多余的.think, she, grow, trouble, among, mountain, two peace, careful,between, because, makeThere once was a king who offered a prize to the artist who painted the best picture of peace. Many artists tried. The king looked at all the pictures. But there were only two he really liked, and he had to choose 71. them. One picture was a quiet lake. The lake was a perfect mirror 髓子〕for peaceful high mountains all around it. Overhead was a blue sky with white clouds. All who saw this picture 72. that it was a perfect picture of peace.The other picture had 73. , too. But these were rocky. Above was an angry sky, rain fell from it and lightning played in it.Down the side of the mountains fell a waterfall. This did not look 74. at all.But when the king looked 75. , he saw behind the waterfall a small bush〔灌木〕76. in a crack〔裂缝〕in the rock. In the bush a mother bird had built 77. nest 康〕.There sat the mother bird in her nest-in perfect peace.Which picture do you think won the prize? The king chose the 78. picture. Do you know why?79. _________ peace does not mean to be in a place where there is no noise,80. , or hard work, "explained the king."Peace means to be the middle ofall those noisy things and still be peaceful in your heart.That is the real meaning of peace.XI .书面表达.〔15分〕听力材料你的同桌Mary上课时总是和别人说话.你与她的关系不错,但她的行为已经影I.听句子,选择正确的答语.听一遍.1. Could you please turn off the radio?响了你的学习.请你写一封信给她,说说你的想法,并给出适当的建议. 70词左右提示词：deskmate何桌〕,disturb〔打搅;影响〕,get rid of〔改掉〕 2. What were you doing when I called you last night?____________________________________________________________________ 3.Have you ever been to the amusement park?____________________________________________________________________ 4. Where s Jim? Do you know?____________________________________________________________________ 5. May I ask you some questions?____________________________________________________________________ II.听对话及问题,选择正确的答案.听两遍____________________________________________________________________ 6. W: What were you doing when the earthquake happened, Eric?____________________________________________________________________ M: I was reading. My mother was watching TV and my father was cooking.Q: Who was watching TV when the earthquake happened?7. W: Our fight will be at 9: 30 a m. Is that OK?M: No. It's too late. I can't get to the meeting in an hour.Q: When will the meeting start?8. M: What s the matter, Lucy?W: I have a sore throat.Q: What's wrong with Lucy?9. W: Do you like doing the dishes, John?M: No, I hate it, but I often help my mom sweep the floor.Q: What chore does John often do at home?10. M: Have you ever been to the water park, Sarah?W: No, I haven't. What about you, Ben?M: Me neither. But Tina has.Q: Who has been to the water park?HI.听两段对话,选择正确的答案.听两遍.听第一段对话,答复第11〜12小题.M: I haven't seen you for a long time. Where have you been?W: I went to New York with my twin sister.M: How long did you stay there?W: We lived with my aunt for a month. We came back a week ago. M: Where s your sister now? I didn't see her today.W: Oh, she went to the library to borrow a book.听第二段对话,答复第13〜15小题.W: The vacation is coming. What are you doing for it, Thomas?M: I'm going bike riding with my friends. What about you, Rose?W: I have to do chores at home for a few days. My parents both work. M: What are you going to do after that?W: I'm going to Beijing.M: What are you going to do therdW: To visit the Great Wall.M: Who are you going with?W: With my cousin.M: Have a good time!W: You too.IV.听短文,选择正确的答案.听两遍.One day a man was on his way to town with many hats. He was walking through a forest. It was very hot and the man wanted to have a little rest. He put one hat on his head and put the others on the ground. Then he sat down under a tree and soon he fell asleep.When he woke up half an hour later, the man couldn't find his hats on the ground. Then he looked around and found many monkeys in the tree. Each monkey had a hat on its head. He shouted at the monkeys and wanted his hats, but the monkeys didrt understand him. At last he was very angry and he threw his last hat onto the ground. Then the little monkeys threw their hats onto the ground, too. In the end, the man picked up all his hats and went to town.参考答案56.longest 57.northwestern 58.Sea 59.Han 60. waterVIII. 61.difference 62.control 63.trained 64.kindness municationIX. 66-70 AECFBX 71. between 72.thought 73.mountains 74.peaceful 75.carefullyI 1-5 CAAAA II 6-10 ABCBC III 11-15CBCAB IV 16-20 BCCBA V 21-25 DACAA 26-30 CCADD 31-35 CCBBCVI 36-40 DCCBD 41-45 BABACVII 46-50 CABDA 51-55 CBDBD76.growing 77.her 78.second 79.Because 80.troubleXI One possible version:Dear Mary,It's good to be your deskmate. Thank you for helping me so much in my study. Ydue a good girl. But you have just one bad habit. You often talk with others, either in or out of class. You may think it's not a problem. But I should say it really disturbs me. I cant listen to the teachers clearly or put my heart into my homework. I think you should get rid of this bad habit and work hard at your schoolwork. I think saying all this may make you uncomfortable at the moment, but you'll find it good for you.Yours,Tom。
【阶段检测】苏科版数学八年级上册 期末测试题 (1) 含答案
苏科版数学 八年级上学期 期末测试题1、下列说法中，正确的个数是（ ）（1）轴对称图形只有一条对称轴，（2）轴对称图形的对称轴是一条线段，（3）两个图形成轴对称，这两个图形是全等图形，（4）全等的两个图形一定成轴对称，（5）轴对称图形是指一个图形，而轴对称是指两个图形而言。
A 1个B 2个C 3个D 4个2、轴对称图形的对称轴的条数（ ）A 只有一条B 2条C 3条D 至少一条3、下列图形中，不是轴对称图形的是（ ）A. 两条相交直线B. 线段C.有公共端点的两条相等线段D.有公共端点的两条不相等线段4、到三角形的三个顶点距离相等的点是（ ）A.三条角平分线的交点B.三条中线的交点C.三条高的交点D.三条边的垂直平分线的交点5、 在△ABC 中，AB=AC ，BC=5cm ，作AB 的垂直平分线交另一腰AC 于D ，连结BD ，如果△BCD 的周长是17cm ，则腰长为（ ）A 、12cmB 、6 cmC 、 7 cmD 、5 cm6、如图，⊿ABC 中，BC ＝10，边BC 的垂直平分线分别交AB 、AC 于点E 、F ，BE ＝7，⊿BCE 的周长为_____。
7、如图，A 、B 是公路边两个新建的居民小区，某镇需在公路边增加一个公共汽车站，这个公共汽车站建在什么位置，才能使两个小区到车站的路程一样，找出汽车站的位置并说明理由。
8、点Q 在∠AOB 的平分线上，QA ⊥OA 于A ，QB ⊥OB 于B ，则AQ ＝____ ,理由是_____________________________________。
9、如图，∠C＝900，∠1＝∠2，若BC＝10，BD＝6，则D到边AB的距离为_____。
10、如图，点P在∠AOB内，PM⊥OA于M，PN⊥OB于N，且PM＝PN，连结OP，则OP是________________。
依据是_______________________________。
人教版八年级上册英语期末测试卷(1)
八年级上册英语期末测试卷(时间：80分钟满分90）姓名____________ 学校____________ 成绩____________一．完型填空（15分）In a small town in England，a girl ,like a lot of tennagers，got tired of home。
She couldn’t stand her family's 1 lifestyle and said,"I am leaving！”She left home。
2 a few days, she was sad and unable to find a job，so sha began to do everything she could do to 3 . Many years passed by.Her father died,her mother grew older.For many years the mother didn’t get any 4 about her daughter.Then one day the mother heard of her daughter’s news and went to the poor part of the city to find her daughter。
She stopped at each of the rescue station and asked the workeds to put up a 5 on the wall.It was a picture of the smiling,grey—haired mother 6 some words on the top：”I love you still..。
come home！”One day the daughter came into a rescue station for a hot meal。
期末素养综合测试卷(一)人教版英语八年级上册
人教版八年级英语上册素养综合测试卷（一）考试内容:Unit 1—Unit 10题序一二三四五六七八总分得分一、听力测试（共20小题，计20分）第一节听对话，选择与对话内容相符的图片。
每段对话读两遍。
第二节听短对话，选择正确答案。
每段对话读两遍。
( )6. What did Helen do yesterday evening?A. She visited her grandparents.B. She went to a talk.C. She saw a film.( )7. How will the woman go to work today?A. On foot.B. By car.C. By bus.( )8. What is the probable relationship between the two speakers?A. Driver and passenger.B. Teacher and student.C. Mother and son.( )9. Where are the two speakers talking?A. In the lab.B. In the library.C. In the classroom.( )10. How often does John go to the gym?A. Every day.B. Once a week.C. Twice a week.第三节听短文，选择正确答案。
短文读两遍。
( )11. How many good friends does Linda have?A. One.B. Two.C. Three.( )12. How often does Lily go shopping?A.Never.B. Every day.C. About once a week.( )13. What does Nancy often do in her free time?A. She often uses the Internet.B. She often goes shopping.C. She often reads magazines. ( )14. How does Tom go to school every day?A. By bike.B. On foot.C. By subway.( )15. What does Linda often do in her free time?A. She often reads magazines.B. She often plays basketball.C. She often plays soccer.第四节听短文，根据短文内容填表。
2022年八年级语文下册期末测试卷一贵阳
2022年八年级语文下册期末测试卷一贵阳1、1叶子底下是（）的流水，遮住了，不能见一些颜色。
（朱自清《荷塘月色》）括号内应填“脉脉”。
[判断题] *对错(正确答案)2、“自惭形秽”中“秽”、“扣人心弦”中“弦”的读音分别是“shu씓xuán”。
[判断题] *对错(正确答案)3、下列选项中加着重号字注音正确的一项是（）[单选题] *A、百舸kě绸缪móuB、橘子jú苍茫chāngC、挥斥方遒qiú层林尽染jìn(正确答案)D、寥廓liào 百侣lǚ4、1“是故无贵无贱，无长无少”的下一句是“道之所存，师之所存也”。
[判断题] *对错(正确答案)5、《红楼梦》“宝玉挨打”的情节历来为读者所津津乐道，下面对宝玉挨打的原因分析有误的是( ) [单选题] *A.宝玉会见官僚贾雨村时无精打采，令贾政很不满意。
B.宝玉与金钏儿说悄悄话被王夫人听见，金钏儿被王夫人打后羞愤投井自杀。
(正确答案)C.贾环搬弄是非，向贾政诬告此系宝玉逼奸不遂，逼死了金钏儿惹怒贾政。
D.宝玉又因留恋戏子蒋玉菡被告了状。
激怒了忠顺王爷，给贾政无端招来政治纠纷。
6、棘手、机遇、极乐鸟、集腋成裘此组词语中加着重号的字的读音相同。
[判断题] *对错(正确答案)7、含情脉脉中的脉读作（）[单选题] *māimǎimǒmò(正确答案)8、17. 下列句子中加双引号成语使用恰当的一项是（）[单选题] *A．生态建设让绿色成为乡村发展最动人的色彩，家乡的河流又开始“川流不息”。
B．李大钊掷地有声的话语，道出了五四先驱“一意孤行”的追求。
C．习近平许多重要讲话，往往用喻贴切，通俗易懂，体现了“平易近人”的语言风格。
(正确答案)D．青岛海上救援队一年365天随时待命，经常出没于“风口浪尖”，救人于危难之中。
9、下列中括号内字注音无误的一项是（）[单选题] *A.杏[仁]（rén）火[炽]（chì）[暂]时（zàn）(正确答案)B.机[杼]（zhù）一[钹]（bá）[犬]牙（quǎn）C.[叛]乱（pàn）褴[褛]（lǚ）坚[劲]（jìn）D.[溶]解（róng) [燕]山（yàn）惆[怅]（chàng）10、1《荷花淀》是孙犁的散文。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
D A BC八年级期末测试一一、选择题（每题2分，共24分） 1、下列各式中，分式的个数有（ ）31-x 、12+a b 、πy x +2、21--m 、a +21、22)()(y x y x +-、x 12-、115- A 、2个 B 、3个 C 、4个 D 、5个 2、如果把223yx y-中的x 和y 都扩大5倍，那么分式的值（ ）A 、扩大5倍B 、不变C 、缩小5倍D 、扩大4倍 3、已知正比例函数y =k 1x (k 1≠0)与反比例函数y =2k x(k 2≠0)的图象有一个交点的坐标为(-2，-1)，则它的另一个交点的坐标是A. (2，1)B. (-2，-1)C. (-2，1)D. (2，-1)4、一棵大树在一次强台风中于离地面5米处折断倒下，倒下部分与地面成30°夹角，这棵大树在折断前的高度为A ．10米B ．15米C ．25米D ．30米5、一组对边平行，并且对角线互相垂直且相等的四边形是（ ）A 、菱形或矩形B 、正方形或等腰梯形C 、矩形或等腰梯形D 、菱形或直角梯形 6、把分式方程12121=----xx x 的两边同时乘以(x-2), 约去分母，得( )A ．1-(1-x)=1B ．1+(1-x)=1C ．1-(1-x)=x-2D ．1+(1-x)=x-2 7、如图，正方形网格中的△ABC ，若小方格边长为1，则△ABC 是（ ） A 、直角三角形 B 、锐角三角形 C 、钝角三角形 D 、以上答案都不对（第7题） （第8题） （第9题）8、如图，等腰梯形ABCD 中，AB ∥DC ，AD=BC=8，AB=10，CD=6，则梯形ABCD 的面积是 （ ） A 、1516 B 、516 C 、1532 D 、17169、如图，一次函数与反比例函数的图像相交于A 、B 两点，则图中使反比例函数的值小于一次函数的值的x 的取值范围是（ ）A BCADEGA 、x ＜－1B 、x ＞2C 、－1＜x ＜0，或x ＞2D 、x ＜－1，或0＜x ＜210、在一次科技知识竞赛中，两组学生成绩统计如下表，通过计算可知两组的方差为2S 172甲＝，2S 256乙＝。
下列说法：①两组的平均数相同；②甲组学生成绩比乙组学生成绩稳定；③甲组成绩的众数＞乙组成绩的众数；④两组成绩的中位数均为80，但成绩≥80的人数甲组比乙组多，从中位数来看，甲组成绩总体比乙组好；⑤成绩高于或等于90分的（A 11、小明通常上学时走上坡路，途中平均速度为m 千米/时，放学回家时，沿原路返回，通常的速度为n 千米/时，则小明上学和放学路上的平均速度为（ ）千米/时A 、2n m + B 、 n m mn + C 、 n m mn +2 D 、mnnm + 12、李大伯承包了一个果园，种植了100棵樱桃树，今年已进入收获期。
收获时，从中任果园樱桃的总产量与按批发价格销售樱桃所得的总收入分别约为（ ）A. 2000千克，3000元B. 1900千克，28500元C. 2000千克，30000元D. 1850千克，27750元二、填空题（每题2分，共24分） 13、当x 时，分式15x -无意义；当m = 时,分式2(1)(3)32m m m m ---+的值为零 14、各分式121,1,11222++---x x x x x x 的最简公分母是_________________15、已知双曲线xky =经过点（－1，3），如果A (11,b a )，B (22,b a )两点在该双曲线上，且1a ＜2a ＜0，那么1b 2b ．16、梯形ABCD 中，BC AD //，1===AD CD AB ，︒=∠60B 直线MN 为梯形ABCD 的对称轴，P 为MN 上一点，那么PD PC +的最小值 。
A E DH G(第16题) （第17题） （第19题）17、已知任意直线l 把□ABCD 分成两部分，要使这两部分的面积相等，直线l 所在位置需满足的条件是 _________ 18、如图，把矩形ABCD 沿EF 折叠，使点C 落在点A 处，点D 落在点G 处，若∠CFE=60°，且DE=1，则边BC 的长为 ．19、如图，在□ABCD 中，E 、F 分别是边AD 、BC 的中点，AC 分别交BE 、DF 于G 、H ，试判断下列结论：①ΔABE ≌ΔCDF ；②AG=GH=HC ；③EG=;21BG ④S ΔABE =S ΔAGE ，其中正确的结论是__个 20、点A 是反比例函数图象上一点，它到原点的距离为10，到x 轴的距离为8，则此函数表达式可能为_________________ 21、已知：24111A Bx x x =+--+是一个恒等式，则A ＝______,B=________。
22、如图,11POA 、 212P A A 是等腰直角三角形,点1P 、2P 在函数4(0)y x x=>的图象上,斜边1OA 、12A A 都在x 轴上,则点2A 的坐标是____________.（第24题）23、小林在初三第一学期的数学书面测验成绩分别为：平时考试第一单元得84分，第二单元得76分，第三单元得92分；期中考试得82分；期末考试得90分.如果按照平时、期中、期末的权重分别为10%、30%、60%计算，那么小林该学期数学书面测验的总评成绩应为_____________分。
24、在直线l 上依次摆放着七个正方形(如图所示)。
已知斜放置的三个正方形的面积分别是1、2、3，正放置的四个正方形的面积依次是S 1、S 2、S 3、S 4，则S 1＋S 2＋S 3＋S 4＝_______。
三、解答题（共52分）25、（5分）已知实数a 满足a 2＋2a －8=0，求22213211143a a a a a a a +-+-⨯+-++的值.（第22题）l321S 4S 3S 2S 126、（5分）解分式方程：22416222-+=--+x x x x x － 27、（6分）作图题：如图，Rt ΔABC 中，∠ACB=90°，∠CAB=30°，用圆规和直尺作图，用两种方法把它分成两个三角形，且要求其中一个三角形的等腰三角形。
（保留作图痕迹，不要求写作法和证明）28、（6分）如图，已知四边形ABCD 是平行四边形，∠BCD 的平分线CF 交边AB 于F ，∠ADC 的平分线DG 交边AB 于G 。
（1）求证：AF=GB ；（2）请你在已知条件的基础上再添加一个条件，使得△EFG 为等腰直角三角形,并说明理由．29、(6分)张老师为了从平时在班级里数学比较优秀的王军、张成两位同学中选拔一人参加“全国初中数学联赛”，对两位同学进行了辅导，并在辅导期间进行了10次测验，两位同学测验成绩记录如下表：利用表中提供的数据，解答下列问题： （1）填写完成下表：（2）张老师从测验成绩记录表中，求得王军10次测验成绩的方差2S 王=33.2，请你帮助张老师计算张成10次测验成绩的方差2S 张；（3）请你根据上面的信息，运用所学的统计知识，帮助张老师做出选择，并简要说明理由。
30、（8分）制作一种产品，需先将材料加热达到60℃后，再进行操作．设该材料温度为y （℃），从加热开始计算的时间为x （分钟）．据了解，设该材料加热时，温度y 与时间x 成一次函数关系；停止加热进行操作时，温度y 与时间x 成反比例关系（如图）．已知该材料在操作加工前的温度为15℃，加热5分钟后温度达到60℃．（1）分别求出将材料加热和停止加热进行操作时，y 与x 的函数关系式；（2）根据工艺要求，当材料的温度低于15℃时，须停止操作，那么从开始加热到停止操作，共经历了多少时间？ 31、（6分）甲、乙两个工程队合做一项工程，需要16天完成，现在两队合做9天，甲队因有其他任务调走，乙队再做21天完成任务。
甲、乙两队独做各需几天才能完成任务？32、(10分)E 是正方形ABCD 的对角线BD 上一点，EF ⊥BC ，EG ⊥CD ，垂足分别是F 、G.求证：FG AE .DCEGF参考答案： 一、选择题1、C2、B3、A4、B5、B6、D7、A8、A9、D 10、D 11、C 12、C 二、填空题13、5x =，3 14、2(1)(1)x x x +- 15、< 16 17、经过对角线的交点 18、3 19、320、48y x =或48y x=- 21、A ＝2，B ＝－2 22、（0） 23、88分 24、4 三、解答题25、解：22213211143a a a a a a a +-+-⨯+-++＝213(1)1(1)(1)(1)(3)a a a a a a a +--⨯++-++ ＝21(1)1(1)a a a --++＝2221a a ++ ∵a 2＋2a －8=0，∴a 2＋2a ＝8 ∴原式＝281+＝2926、解：22(2)16(2)x x --=+ 22441644x x x x -+-=++816x -= 2x =-经检验：2x =-不是方程的解∴原方程无解27、1°可以作BC 边的垂直平分线，交AB 于点D ，则线段CD 将△ABC 分成两个等腰三角形2°可以先找到AB 边的中点D ，则线段CD 将△ABC 分成两个等腰三角形3°可以以B 为圆心，BC 长为半径，交BA 于点BA 与点D ，则△BCD 就是等腰三角形。
28、（1）证明：∵四边形ABCD 为平行四边形 ∴AB ∥CD ，AD ∥BC ，AD ＝BC ∴∠AGD ＝∠CDG ，∠DCF ＝∠BFC ∵DG 、CF 分别平分∠ADC 和∠BCD ∴∠CDG ＝∠ADG ，∠DCF ＝∠BCF ∴∠ADG ＝∠AGD ，∠BFC ＝∠BCF ∴AD ＝AG ，BF ＝BC ∴AF ＝BG（2）∵AD ∥BC ∴∠ADC ＋∠BCD ＝180° ∵DG 、CF 分别平分∠ADC 和∠BCD∴∠EDC ＋∠ECD ＝90° ∴∠DFC ＝90°∴∠FEG ＝90° 因此我们只要保证添加的条件使得EF ＝EG 就可以了。
我们可以添加∠GFE ＝∠FGD ，四边形ABCD 为矩形，DG ＝CF 等等。
29、1）78，80（2）13（3）选择张成，因为他的成绩较稳定，中位数和众数都较高30、（1）915(05)300(5)x x y x x+≤<⎧⎪=⎨≥⎪⎩ （2）20分钟31、解：设甲、乙两队独做分别需要x 天和y 天完成任务，根据题意得：111169301x y x y⎧+=⎪⎪⎨⎪+=⎪⎩ 解得：24x =，48y = 经检验：24x =，48y =是方程组的解。