初二下部分39-40参考答案
初中英语:2023北京大兴初二(下)期中英语试卷(含参考答案)
2023北京大兴初二(下)期中英语2023.04第—部分本部分共33题,共40分。
在每题列出的四个选项中,选出最符合题目要求的—项。
—、单项填空(每题0.5分,共6分)从下面各题所给的A、B、C、D四个选项中,选择可以填入空白处的最佳选项。
1.——Lisa, you play the guitar very well. Who taught you?—No one. I just taught__________.A.myselfB. herselfC. himselfD. yourself2.We have a history class _________Friday afternoon.A.toB. atC. inD. on3.——_________you give me a hand? I can't move the box.— No problem.A.CouldB. ShouldC. MustD. Need4.——_________does the museum open on weekdays?——At 9:00 a. m.A. HowB. WhenC. WhyD. Where5.____________ ifs very difficult, remember not to give up until the last minute.A. UnlessB. UntilC. AlthoughD. Since6.After taking football lessons, Tom is much __________than last year.A.strongB. strongerC. strongestD. the strongest7.Peter invited me ____________with him when his parents were out.A. stayB. stayedC. stayingD. to stay8.——Tina, what do you usually do at weekends?—I usually _________swimming with my parents.A. goB. goesC. goingD. went9.Look! Some children __________kites on the playground.A. flyB. flewC. are flyingD. will fly10.—Tina, how was your weekend?—Great! We ____________a picnic in the park.A. haveB. hadC. will haveD. are having11.If you want to visit the Palace Museum tomorrow, I ________tickets for you.A. bookB. bookedC. will bookD. was booking12.I ___a sweet dream when my friend called me this morning.A. haveB. hadC. am havingD. was having二、完形填空(每题1分,共8分)阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。
2020-2021学年辽宁省丹东市八年级(下)期末物理试卷(附答案详解)
2020-2021学年辽宁省丹东市八年级(下)期末物理试卷一、单选题(本大题共7小题,共14.0分)1.下列数据最接近实际的是()A. 八年级物理书的重力约为8NB. 一名普通中学生双脚站立时对地面的压强约为1×104PaC. 一台起重机的机械效率一般为90%D. 优秀运动员短时间运动的功率约为100W2.对于静止在水平桌面上的矿泉水瓶,下列说法正确的是()A. 桌面对瓶子的支持力与瓶子所受重力是相互作用力B. 瓶子对桌面的压力与桌面对瓶子的支持力是平衡力C. 瓶子正放与倒放时,对桌面的压力是不同的D. 如果瓶子所受的力同时全部消失,它将仍留在原位保持原来的静止状态3.下列四幅图中,目的是为了增大摩擦的是()A. 加润滑剂B. 滚动轴承C. 涂有防滑粉的手D. 气垫船4.关于运动和力,以下说法中正确的是()A. 运动员在弯曲的跑道上奔跑时,他的运动状态在不断改变B. 竖直匀速下落的雨滴受到的力不是平衡力C. 从树上自由下落的苹果,如果突然不受任何力的作用,将立即停止运动D. 人推木箱没有推动,是因为人对木箱的推力小于地面对木箱的摩擦力5.下列说法正确的是()A. 物体做功越多,功率一定越大B. 物体做功时间越短,功率一定越大C. 相同的时间里做功越少,机械的功率就越小D. 功率越大的机械,机械效率越高6.下了四幅图中属于费力杠杆的是()A. 瓶起子B. 踮起脚C. 剪铁剪刀D. 自动卸货车7.关于压强、浮力知识应用,以下说法正确的是()A. 医生用注射器将药液注入肌肉是利用大气压的作用B. 同一支密度计在不同液体的液面漂浮时所受浮力相等C. 因为鸭绿江水的密度小于海水的密度,所以轮船从鸭绿江驶入大海,浮力变大D. 小汽车跑的过快,有车身“打漂”的感觉,是因为流速大的位置压强大而产生了升力二、多选题(本大题共3小题,共9.0分)8.如图所示,一弹簧的左端固定,右端连接一小球,把它们套在光滑的水平杆上,a点是压缩弹簧后小球静止释放的位置,b点是弹簧原长时小球的位置,c点是小球到达最右端的位置,则小球由a点运动到c点过程中,下列说法正确的是()A. 小球在a点,弹簧的弹性势能最小B. 小球在b点,小球的动能最大C. 从a点到b点,弹簧的弹性势能转化为小球的动能D. 从b点到c点,小球的机械能守恒9.如图所示,在250N的拉力F作用下,滑轮组将400N的重物在2s内匀速提升了0.1m,在此过程中()A. 拉力F做的有用功为40JB. 滑轮组的机械效率为80%C. 拉力F的功率为25WD. 动滑轮的重为100N10.如图所示,水平桌面上有一个三格水槽(每格底面积相同)。
四川省内江市第一中学2022-2023学年八年级下学期3月月考英语试题(含答案,无听力原文及音频)
内江一中2023年初二年级3月月考英语试卷(考试时间:120分钟总分:120分)第Ⅰ卷(选择题共75分)第一部分听力测试(共20个小题,每小题1分,满分20分)第一节(共5个小题,每小题1分,满分5分)听下面5段对话,每段对话有一个小题,从小题中所给的A、B、C三个选项中选出最佳选项( )1. What does the man do?A. He is a doctor.B. He is a teacher.C. He is a driver.( )2. When was Han Mei ill in hospital?A. Last week.B. This week.C. Yesterday.( )3. What's wrong with Cindy?A. She hurt her back.B. She hurt her foot.C. She hurt her leg.( )4. What's wrong with Lisa?A. She has a fever.B. She has a cough.C. she has a fever and a cough. ( )5. Why didn't Mandy sleep well last night?A. Because she was tired.B. Because she had a terrible toothache.C. Because she couldn't eat anything and she was hungry.第二节(共15个小题,每小题1分,满分15分)听下面4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 三个选项中选出最佳选项。
听第6段材料,回答第6、7小题。
( )6. Where is the man going?A. To the hospital.B. To the school.C. To the bank.( )7. Who had a heart problem?A.The man.B. The woman.C. The woman’s grandfather.听第7段材料,回答第8至10小题。
广东省深圳市南山区2020-2021学年八年级(下)期末物理试卷及答案解析
2020-2021学年广东省深圳市南山区八年级(下)期末物理试卷一、单选题(本大题共10小题,每小题2分,共20分)1.(2分)俗话说“一个巴掌拍不响”,这是因为()A.一个巴掌的力太小B.人不会只有一个巴掌C.物体间力的作用是相互的D.只有一个物体也可以产生力的作用2.(2分)利用铅垂线和三角尺判断桌面是否水平,如图所示的做法正确的是()A.B.C.D.3.(2分)如图所示,两本书的书页交叉叠放在一起后很难拉开,是因为拉书时书页间会产生较大的()A.重力B.弹力C.压力D.摩擦力4.(2分)动物大多有各自的求生绝活,如图所示“绝活”中,能减小压强的是()A.啄木鸟的尖嘴B.骆驼的巨掌C.鹰的利爪D.野牛的锥角5.(2分)考试时,许多同学有一个不良习惯,将笔放在手指上不停地转圈,笔会经常掉到地面或桌面上发出噪声。
下列说法正确的是()A.笔在下落过程中不受力的作用B.笔停在静止的手指上时受到平衡力作用C.笔在手指拨动时才会连续转圈,说明力是维持物体运动的原因D.手指不拨动笔,笔也会在手指上继续转动一段时间,说明笔与手指间不存在摩擦力6.(2分)水是人类生存不可缺少的物质,图中能正确描述水的各物理量之间关系的图象是()A.水的重力与质量的关系B.水的密度与体积的关系C.浸没在水中铁块所受浮力与深度关系D.水产生的压强与深度的关系7.(2分)将同一长方体分别水平与竖直放置在水中,如图所示,它所受到的()A.向上、向下压力差不等,浮力相等B.向上、向下压力差不等,浮力不等C.向上、向下压力差相等,浮力不等D.向上、向下压力差相等,浮力相等8.(2分)如图所示的工具中,使用时属于费力杠杆的是()A.钢丝钳B.起子C.羊角锤D.镊子9.(2分)非洲旱季常用中间有转轴的塑料桶运水,如图所示,小红分别用背背、手抱、平拉、滚拉的方式运送装满水的水桶,在粗糙程度相同的水平地面上匀速直线拉动将水运送相同的距离,则她对桶和水做功最多的是()A.B.C.D.10.(2分)如图示,同一物体沿相同水平地面被滑轮或滑轮组匀速拉动,拉力分别为F1、F2、F3,不计滑轮与轴及轻绳间的摩擦,比较它们的大小,则()A.F1<F2<F3B.F1>F2=F3C.F2>F1>F3D.F1=F2>F3二、双选题(本大题共5小题,每小题3分,共15分)11.(3分)小明是一位健康的九年级男生,比较符合他的实际情况的是()A.游泳时受到的浮力为5000N B.爬楼时的功率约为150WC.教室内的大气压强约为2×105Pa D.双脚站立时对地面的压强约为100Pa(多选)12.(3分)对于下列实验,说法正确的是()A.如图中托里拆利实验测得的76cm汞柱是a段B.通过如图实验可直接得到牛顿第一定律C.将图中A端钩码向O点移动一个格,B端钩码向O点移动两个格,杠杆仍然平衡D.用大小相同的力沿图中三个斜面将同一物体推上同一高度,斜面C机械效率最高(多选)13.(3分)关于功、功率、机械效率说法正确的是()A.功率越大,做功就越快B.做功时间越短,功率就越大C.机械效率越大,表明它做的功越多D.有用功一定,减小额外功,可以提高机械效率(多选)14.(3分)如图所示的四幅图对应的说法中正确的是()A.如图中某同学沿杆匀速向上爬时,他受到的摩擦力方向竖直向下B.如图中物体A压在墙上静止时,压力F增大时,物体A受到的摩擦力不变C.如图中用吸管对着玻璃管上方吹气时,玻璃管中水柱会升高D.如图中力F水平向左抽出木板B的速度越快,弹簧测力计的示数就越大(多选)15.(3分)在一次提升重物的过程中,工人利用了如图所示的简单机械,忽略绳子和滑轮间的摩擦,忽略绳重,若工人用200N的拉力F将重为300N的重物在4s内匀速提高了2m,则下列判断正确的是()A.工人做的有用功为600J B.滑轮重为50NC.工人做功的功率为100W D.滑轮的机械效率为75%三、实验题(本大题共2小题,每小题7分,共14分)16.(7分)如图所示是小明用矿泉水瓶做了如下一些实验:(1)如图a所示,他用水平力推动矿泉水瓶底部时,瓶子沿桌面平稳的移动:他用相同的水平力推瓶盖时,瓶子翻了,验证的是力的作用效果与力的有关。
高压电工作业理论考试竞赛试题训练题
高压电工作业理论考试竞赛试题训练题姓名:日期:用时:分钟得分:一、单选题(共200题每题0.2分,总计40分)答案1.小母线编号中,符号“~”表示()性质。
1.正确答案:A A:交流 B:负极 C:正极2.大型的()和大型电弧炉,产生的谐波电流最为突出,是造成电网谐波的主要因素。
2.正确答案:A A:晶闸管变流设备 B:荧光灯 C:高压汞灯3.KYN28-10型高压开关柜小车室内的主回路触头盒遮挡帘板具有( C )的作用。
3.答案:CA、保护设备安全B、保护断路器小车出、入安全C、保护小车室内工作人员安全D、保护继电保护装置安全4.、三相变压器绕组为星形联接时,绕组相电压乘以30。
5就等于(C)4.正确答案:CA 相电压B 最大电压C 线电压5.电气安全用具按其基本作用可分为()。
5.正确答案:C A:绝缘安全用具和辅助安全用具 B:基本安全用具和辅助安全用具 C:绝缘安全用具和一般防护安全用具6.10kV低压电阻接地系统中,用户变配电应在(C)处装设零序电流保护装置。
6.参考答案:CA、进线开关B、出线开关C、进线、出线和联络开关D、联络开关7.在闭合的变压器铁芯上,绕有两个互相绝缘的绕组,其中,接入电源的一侧叫一次侧绕组,输出电能的一侧为( )。
7.正确答案:BA:高压侧绕组 B:二次侧绕组 C:低压侧绕组8.( )是指变压器线圈中的电阻损耗,与电流大小的平方成正比,它是一个变量。
8.正确答案:A A:铜损 B:线损 C:磁损9.电力线路按架设方式可分为()。
9.正确答案:C A:输电线路和配电线路 B:高压线路和低压线路 C:架空电力线路和电力电缆线路10.大型电力系统有强大的调频和( D )能力,有较大的抵御谐波的能力,可以提供质量更高的电能。
10.答案:DA、调相B、调功C、调流D、调压11.变、配电所主要由主变压器、( )、控制系统等部分构成,是电网的发电厂重要组成部分和电能传11.正确答案:C 输的重要环节。
八年级地理下册会考试题(带答案)
2019年八年级地理下册会考试题(带答案)以下是查字典地理网为您推荐的2019年八年级地理下册会考试题(带答案),希望本篇文章对您学习有所帮助。
2019年八年级地理下册会考试题(带答案)试卷说明:整卷满分为100分,开卷,考试时间为60分钟。
题型均为单项选择题。
请将所选答案准确填涂在答题卡上。
答在试卷上不得分。
一、基础知识题(本大题共20小题,每小题2分,共40分) 我国是一个疆域辽阔的国家,每一位公民都要有领土意识。
读图1完成1~2题1.我国领土的最南端在 ( )A.南海的南沙群岛中的曾母暗沙B.黑龙江省漠河以北的黑龙江主航道中心线上C.黑龙江与乌苏里江主航道中心线的相交处D.新疆帕米尔高原2.能正确反映中国位置优越,国土辽阔的是 ( )A.南北跨纬度约57,雨热同期。
B.同一时刻,我国最西端的帕米尔高原夜幕深沉,最东端的乌苏里江上烈日当空C.海陆兼备,面积居世界第三位D.资源总量丰富,类型齐全图1人类对地球海陆分布的认识,经历了极其漫长的过程。
早期,人们只能认识人类足迹和视野所及的地方,直到19世纪末和20世纪初,人类对地球表面的海陆分布才有一个基本正确的认识。
图2为世界海陆分布图,读图回答3~5题。
图23、上图中,按①②③的数字顺序,下列说法正确的是A.太平洋、大西洋、印度洋B.太平洋、印度洋、大西洋C.大西洋、太平洋、印度洋D.印度洋、太平洋、大西洋4、下列说法正确的是A.世界上跨经度最广的大洲是亚洲B.大洋①将缩小,大洋②将扩大C.地球表面以海洋为主,陆地主要集中在南半球D.北美洲与南美洲的分界线是苏伊士运河5、全球六大板块中,几乎全部在大洋之中的板块是 ( )A.美洲板块B.亚欧板块C.太平洋板块D.非洲板块世界的气候是复杂多样的,受到了位置、地形等多种因素的共同影响。
回答6~7题。
6.关于纬度位置对气候的影响 ( )A.同一纬度地带,接受太阳光热相同,气温完全一致B.降水不受纬度因素影响,只受海陆位置的影响C.降水受海陆位置因素的影响,在低纬度比较明显D.一般是低纬度气温高,高纬度气温低7..北回归线穿过的地区,大陆西岸一般是A.热带草原气候B.热带季风气候C.热带沙漠气候D.温带沙漠气候读部分国家人均耕地比较图(图3)和我国土地利用构成图(图4),回答8~9题图3 图48.关于我国土地资源特点的叙述,正确的是( )A.山地多,平地少,耕地、林地比重小B.土地资源总量不足,种类少C.土地资源总量少、但人均数量多D.各类土地资源空间分布较均匀9.我国土地资源对农业发展的有利方面表现在( )A.土地资源类型多样B.人均耕地少C.各类土地资源分布不均D.山地多,平地少钢铁工业是一个国家重要的工业基础。
学英语报纸第39-42期答案
C 本文为议论文,题材为新闻广告类。文章运用大 量事实论述了道路交通事故是造成年轻人死亡的头 号杀手。 28. C。指代关系题。第一段讲述了道路交通事故 是造成年轻人死亡的最主要原因,之后WHO称这可 以避免。所以,they在文中指代traffic crashes。 29. B。推理判断题。由第二段可知,非洲仅占有世 界上2%的机动车辆,但因为道路交通事故而造成的 伤亡数却是世界之最。由此可推知,非洲应该采取措 施来应对这个问题。 30. A。推理判断题。最后一段最后一句话告诉我 们还有别的方法也可以减少交通事故造成的死亡,让 道路变得更加安全。因此接下来文章很可能要谈减少 交通事故造成的死亡的其他方法。 31. B。主旨大意题。第一段告诉我们道路交通事 故是造成年轻人死亡的头号杀手,之后提供了大量事 实论证,最后给出了一些减少此类事故的建议。
the
of his part-time job. He worked every day after finish
finishing
his homework. Three months late, he had enough money
later
to buy a bike. He went to the bike shop excited. Then he
50. A。由collecting leftover bread from all his housemates可知,他在房子里到处走动,向合住者收 集吃剩的面包。
51. B。收集到残余面包之后他接下来就花一两个 小时将它们碾碎。
初二下部分39-40参考答案
初二下部分参考答案(5)
练习39(
1. 先△ABE ≌△BCF ≌△CAD ,
2.三次全等,
3.证△PQM ≌△PRN
4.△ABC ≌△DBE ,∠BAC + ∠DAF =∠BDE +∠DEF =60 +180
1. 取CD 的中点M ,连结ME ,MF 6. △EAM ≌△ABH
5. 作△ABD 的高DF ,证△BDF ≌△BAC
6. 作斜边上高,找全等三角形
7. 求出∠DBC =30 ,有两种图形
8. 延长BC 到N ,使CN =AB ,延长CB 到M ,使BM =AC , 证△AMD ≌△AND ,△CAN ≌△MBA
9. 延长BE 到F ,使EF =BC
10. 延长CB 到G 使BG =DF
13. 证明
CD
NF CD ME 14.∠CDF =∠F =∠BDF =∠DHC =22.5 练习40(
1. 以AD 轴作轴对称三角形
2. 取AB 中点N ,再证明DN =DM
3. 利用外角性质,分别用两角差表示∠A 和∠E
4. 有多种证明方法,注意三角形中位线性质
6. ∠B +(∠BAE -∠DAE )=90, ∠C +(∠EAC +∠DAE )=90
7. ∠ABC = ∠ACB =∠D +∠CBD ,两边同加上∠CBD 10 .作高AH
12 延长GE 交AC 于M ,则E 是GM 的中点,作EP ∥BC 交AC 于P ,则EP 被AD 平分
11. 在BC 上取BE =BD ,则△EDC 等腰,作DF ∥BC 交AB 于F ,可证△ECD ≌△ADF
16. 在BF 上截取BG =FC ,△BGE ≌△CFA ,再证GE =GF。
(完整版)新人教版八年级下册第八、九、十章重点知识回顾与测试(含答案)-
( 2)不等式两边乘(或除以)同一个正数,不等号的方向不变;
( 3)不等式两边乘(或除以)同一个负数,不等号的方向改变.
2 .解一元一次不等式与解一元一次方程基本相同,只是在化系数为
1 时注意不等式
性质的运用,另外,不等式的最后结果是一个解集,确定不等式组的解集时应区分以下四
种情况:
( 1)同大取大;( 2)同小取小;( 3)大于小的,小于大的,取公共部分;( 4)大
( 5)任意两个实数都可以比较大小; ( 5)在进行实数运算时, 和有理数运算一样, 要从高级到低级, 即先算乘方、 ?开方, 再算乘除,最后算加减,有括号的要先算括号里面的,同级运算要按照从左到右的顺序进 行. 另外,有理数的运算律在实数范围内仍然适用. 五、方法导引 复习这三章应注意数学思想方法的运用,如在第八章“二元一次方程组”中,借助于 平面直角坐标系,就可以用二元一次方程组的图象求得方程组的近似解,从而用几何的方 法确定代数问题;在第九章“不等式与不等式组”中,用数轴表示不等式(组)的解集, 体现了数形结合的思想;在第十章“实数”中,学习直线上的点与实数的一一对应以及平 面上的点与有序实数对一一对应等,也体现了数形结合的思想.转化是数学中一种基本的 也是非常重要的思想方法之一.如,在复习二元一次方程组的解法时,应注意体会二元化 为一元的消元 (转化) 的思想. 在列一次方程组解应用题和列不等式或不等式组解应用题, 也应体会未知化为已知的转化思想.类比又是学习数学的一种有效方法.如,类比等式的 性质得出不等式的性质,类比方程(组)的解法寻找不等式(组)的解法等. 六、典型题赏析
( B) 3>2
( C) 0>-1
( D) 2>-1
1x
5.不等式
≥ 1 的解集在数轴上表示正确的是(
广州初二八下-英语期末各区题型专练-语法选择与完形填空(含答案)
广州初二八下期末各区题型专练语法选择与完形填空第二节:语法选择(共10小题;每小题1分,满分10分)I’ve been following Gossip Girls for nearly three years now. Its popular content (内容) attracts me, and by _26_ the show I’ve learned a lot of expressions Americans use when talking _27_ university life. I’ve learned how students make friends, how they joke, and how they invite people to parties. Girls who love fashion _28_ learn the proper pronunciation of famous brands (商标) like Yves Saint Laurent and Burberry. The show _29_ gives us _30_ topics to talk about with foreigners! In one setting(场景), characters begin _31_ which university they go. They tour schools _32_ Yale and have interviews with professors. This gives us a loo k of life at universities in the US. Of course, I’ve learned many useful English words and lines. For example, I _33_ by a sentence. “Life is so short, it’s all uncertain.” _34_ whenever I want to encourage someone _35_ a quick decision, I use this line.26.A.watched B.watching C.having watched D.watch27.A.for B.on C.about D.with28.A.can B.have C.must D.shall29.A.again B.either C.also D.as well30.A.plenty B.plenties of C.a plenty of D.plenty of 31.A.consider B.considered C. to considering D.to consider32.A.like B.as C.for example D.as like 33.A.impressed B.was impressed C.have impressed D.was impressing 34.A.However B.So C.But D.Therefore 35.A.make B.makes C.to make D.making三、完形填空(共10小题;每小题1分;满分10分)What should we do to stay healthy? One important rule is to exercise 36 . The Smith family try to exercise every day. Mr Smith 37 exercise in the morning because he must be at his job at exactly seven o'clock. But he runs every evening. Mrs Smith runs a lot, 38 . She 39 different sports with her friends. Sometimed, Mrs Smith goes to a yoga (瑜伽) class 40 . But it wasn't 41 this way. Last year Mr. and Mrs. Smith used to 42 everywhere in their car, even to the drugstore two blocks (街区) away. They thought they had to use the car all the time. They wouldn't walk. The Smith both 43 better now. And they believe they mustn't be lazy. We 44 exercise every day, but we should try 45 as often as possible.36. A.regularly B.sometimes C.late D.later37. A.may not B.can not C.would not D.should not38. A.either B.also C.too D.again39. A.watches B.plays C.loves D.likes40. A.in two weeks B.for two weeks C.after two weeks D.twice a week41. A.always B.even C.sometimes D.no42. A.riding B.drive C.fly D.walk43. A.had B.make C.feel D.want44. A.needn’t B.don’t C.won’t have D.mustn’t45. A.exercise B.to exercise C.exercises D.exercising语法选择26-30 BCACD 31-35 DABBC 完形填空36-40 ABCBD 41-45 ABCAB第二节:语法选择(共10小题;每小题1分,满分10分)Some children wish to be writers when they grow up. That 31 they want to write stories or books. They would be happy if many people read their stories or books some day, but I would like 32 these children that they will need to be good readers and read a lot of before they become good writers.Nearly all great writers often listened 33 others tell stories long before they started school. They also 34 on reading for hours and hours for years. Even when they have become writers, they spend much of their time 35 books instead of waching TV in the evening.If you are a good reader, it won’t take you long 36 the reading homework your teacher asks you to do. Then you will have time to read 37 books for fun. You read so 38 that you always want to look for more books to read.If you want to be a writer, reading is very 39 . When you decide to become a writer, you had better tell 40 , “I must read more and more if I really want to become a good writer.”31. A. means B. meaning C. mean D. meant32. A. tell B. telling C. told D. to tell33. A. for B. to C. at D. of34. A. keep B. keeping C. kept D. will keep35. A. read B. reads C. reading D. to read36. A. do B. doing C. another D. the other37. A. others B. other C. What an D. How38. A. good B. well C. better D. best39. A. important B. importantly C. importance D. more importantly40. A. you B. your C. yourself D. yours三、完形填空(共10小题;每小题1分;满分10分)Everyone needs friends. We all like to 41 close to someone. It is nice to have a friend to talk, laugh and do things with. 42 , sometimes we need to be alone. We don't always want people 43 . But we would feel lonely if we never had a friend. No two people are just the same. Friends 44 don't get on well. That doesn't mean that they no longer 45 each other. Most of the time they will make up (言归于好), and become friends again. Sometimes friends move away. Then we feel very 46 . We miss them very much, but we can 47 them and write to them. And we can also make new friends. It’s surprising to find out 48 we like new people when we get to know them. There's more good 49 for people who have friends. They live longer than people who don't have. Why? It 50 be that they are happier. Being happy helps you stay well. Or it could be good just knowing that someone cares. If someone cares about you, you take better care of yourself.41. A. watch B. feel C. look D. see42. A. Nearly B. Hardly C. Certainly D. Suddenly43. A. around B. alone C. away D. above44. A. always B. often C. sometime D. usually45. A. know B. think C. hate D. like46. A. angry B. sad C. happy D. surprise47. A. ask B. call C. tell D. order48. A. how much B. how long C. how many D. how often49. A. confidence B. thought C. knowledge D. news50. A. must B. should C. would D. need语法选择31-35 ADBCC 36-40 DBBAC 完形填空41-45 BCACD 46-50 BBBDB2015年6月天河区八年级下学期期末考试卷第二节语法选择(共10小题,每小题1分,满分10分)Wang Damin is a fisherman. Although he is over 65, he is very fit and still enjoys____26_____.Damin uses cormorants to catch fish. Cormorants are large black birds. They are good at catching fish because they can swim____27_____. They can dive down and stay under water____28_____up to two minutes.Damin usually starts his work in the late afternoon and ____29_____ the cormorants ready for work. First, he ties a piece of grass around their necks to stop them ____30_____big fish. Then when Damin’s boat____31_____the right place in the river, he pushes them into the river. Damin uses several ways_____32____the fish. During the day, he jumps up and down on his boat. After dark, a light____33_____ on a post at the front of the boat. The cormorants bring the fish back to the boat. The fish are taken and thrown into a big basket. Some of them will be sold by Damin.No nets are required for this type of fishing.Cormorant fishing was once practised in lots of places in South-East China, and there were many fishermen in the area. But today, few young people are interested in____34_____ or learn the skill from the old fishermen. In 50 years, perhaps there ____35_____no more cormorant fishermen in the world.26. A. work B. works C. working D. worked27. A. good B. better C. best D. well28. A. from B. for C. about D. almost29. A. get B. is getting C. gets D. will get30. A. from eating B. to eating C. eat D. to eat31. A. reaches to B. reaches C. arrives D. gets32. A. attract B. attracts C. attracting D. to attract33. A. hang B. hangs C. is hung D. is hanging34. A. theirs B. them C. its D. it35. A. is B. are C. will have D. will be三、完形填空(共10小题,每小题1分,满分10分)Chris is not a traditional explorer(探险家). He usually works in a(n)____36_____for a large organization. Yet his job can sometimes be just as exciting and ____37_____as being an explorer.Chris____38_____MSF, an organization also known as Doctors Without Border(无国界医生). MFS sends trained doctors all over the world to help people after a war or a disaster.There are over 27,000 trained doctors taking part in MSF projects. The organization____39_____ the Nobel Peace Prize in 1999. All kinds of doctors can volunteer for MSF. They need to be ready to go almost anywhere in the world and, of course, they____40_____face difficult conditions. Doctors with experience in tropical(热带的)diseases are very____41_____ because most of MSF’s work is in Africa. When MSF accepts a____42_____for a task, he has to leave home for at least six months. When doctors have completedall tasks, they might be sent on the task following a disaster, such as an earthquake.But why would a doctor____43_____ a comfortable life to join MSF?According to Chris, the experienceis a great help in your career. ____44_____, you need to keep an open mind and learn to communicate well with the people. Most importantly, at the ____45_____of each task,you have made a real difference to people’s lives.36. A. office B. factory C. shop D. school37. A. pleased B. simple C. easy D. dangerous38. A. plays against B. works for C. cares for D. agrees wih39. A. received B. created C. discovered D. chose40. A. shouldn’t B. have to C. can’t D. cant41. A. helpful B. faithful C. careful D. wonderful42. A. nurse B. worker C. doctor D. manager43. A. set up B. give up C. make up D. take up44. A. Finally B. Above all C. Anyway D.What’s more45. A. end B. beginning C. start D. middle第二节语法选择(共10小题,每小题1分,10分)26-30 CDBCA 31-35 BDCDD完形填空(共10小题,每小题1分,10分)36-40 ADBAB 41-45 ACBDA2015年6月海珠区八年级下学期期末区统考英语科第二节语法选择(共10小题;每小题1分,满分10分)These days, Paul Walker might be the name of a man that most people talk about as his last film Fast & Furious 7 was shown in cinema in April,2015. David Walker was born in Glendale, California ___26___ September 12th,1973. His mother was once a model and he became an ___27___ at a very early age. He first ___28___ on the stage when he was 2 years old and began his career at the age of 13. Paul Walker began to act in the film Fast & Furious in 2001 and from then on, he acted in six Fast & Furious series films in total. Just like the plot in his films, Paul Walker enjoyed___29___ his car very fast but ___30___, a serious car accident ___31___ to him when he ___32___ to Los Angles in his new car in November,2013. Some special effects ___33___ in the film Fast & Furious 7___34___ Paul Walker’s death. Many of his fans went to cinemas to watch the film and some were too excited ___35___ their feelings when they saw this handsome man’s pleasa nt smile and heard the song See You Again.26. A. in B. on C. at D. from27. A. act B. acting C. actor D. action28. A. appear B. was appearing C. appeared D. has appeared29. A. race B. to race C. racing D. to racing30. A. luck B. lucky C. luckily D. unluckily31. A. happen B. happened C. is happened D. was happened32. A. drive B. drove C. was driving D. has driven33. A. use B. used C. are used D. were used34. A. because B. because of C. so D. for35. A. control B. to control C. controlling D. to controlling三、完形填空(共10小题;每小题1分,满分10分)Where has the Time gone? It is the hottest song that has ___36___ thousands of Chinese to tears. Parents give their children endless love but ask for ____37____ in return. What about you, children? Do you loveyour parents? You may say,--Of course I do. I cook for my mother on Mother’s Day and on Father’s Day I buy father ___38___,too. But what about ___39___ days of the year?Here is a story about a girl called Fang Meijiao. She is a university ___41___ in Anhui Province. Unluckily, both her father and brother died. What’s worse, her mother became badly ill and couldn’t move any more two years ago. Instead of losing hope, she decided to take her mother to her ___41___ with her. In the day time, she keeps on studying hard and after class, she hurries to the dormitory(宿舍) to ___42___ her sick mother. Every day, she cooks for her, feeds her, bathes her and ___43___ with her. At the same time, she has to do some part-time jobs to pay for her mother’s expensive medicine. With her great effort, her mother is getting much better. Her dream is o get a good job for a better life with her mother.You may also say,--This is not a ___44___ case. But you should ___45___ that your parents are getting older and weaker every day. You need to care more about their feelings and spend more time with them.36. A.pleased B.moved C. relaxed D.surprised37. A.something B.anything C.everything D.nothing38. A. a gift B. a kiss C. a hug D. a meal39. A.another B.the other C. others D.the others40. A.student B.teacher C.worker D.doctor41. A.home pany C.university D.hospital42. A.look around B.look after C.look up D.look over43. A.walks B.dances C.runs D. chats44. mon B.simple C.faithful D.terrible45. A.forget plain C.realize D.refuse第二节语法选择(共10小题,每小题1分,10分)26-30 BCCCD 31-35 BCDBB三、完形填空(共10小题,每小题1分,10分)36-40 BDABA 41-45 CBDAC2015年6月天河区八年级下学期期末考试第二节语法选择(共10小题,每小题1分,满分10分)Wang Damin is a fisherman. Although he is over 65, he is very fit and still enjoys____26_____.Damin uses cormorants to catch fish. Cormorants are large black birds. They are good at catching fish because they can swim____27_____. They can dive down and stay under water____28_____up to two minutes.Damin usually starts his work in the late afternoon and ____29_____ the cormorants ready for work. First, he ties a piece of grass around their necks to stop them ____30_____big fish. Then when Damin’s boat____31_____the right place in the river, he pushes them into the river. Damin uses several ways_____32____the fish. During the day, he jumps up and down on his boat. After dark, a light____33_____ on a post at the front of the boat. The cormorants bring the fish back to the boat. The fish are taken and thrown into a big basket. Some of them will be sold by Damin.No nets are required for this type of fishing.Cormorant fishing was once practised in lots of places in South-East China, and there were many fishermen in the area. But today, few young people are interested in____34_____ or learn the skill from the old fishermen. In 50 years, perhaps there ____35_____no more cormorant fishermen in the world.26. A. work B. works C. working D. worked27. A. good B. better C. best D. well28. A. from B. for C. about D. almost29. A. get B. is getting C. gets D. will get30. A. from eating B. to eating C. eat D. to eat31. A. reaches to B. reaches C. arrives D. gets32. A. attract B. attracts C. attracting D. to attract33. A. hang B. hangs C. is hung D. is hanging34. A. theirs B. them C. its D. it35. A. is B. are C. will have D. will be四、完形填空(共10小题,每小题1分,满分10分)Chris is not a traditional explorer(探险家). He usually works in a(n)____36_____for a large organization. Yet his job can sometimes be just as exciting and ____37_____as being an explorer.Chris____38_____MSF, an organization also known as Doctors Without Border(无国界医生). MFS sends trained doctors all over the world to help people after a war or a disaster.There are over 27,000 trained doctors taking part in MSF projects. The organization____39_____ the Nobel Peace Prize in 1999. All kinds of doctors can volunteer for MSF. They need to be ready to go almost anywhere in the world and, of course, they____40_____face difficult conditions. Doctors with experience in tropical(热带的)diseases are very____41_____ because most of MSF’s work is in Africa. When MSF accepts a____42_____for a task, he has to leave home for at least six months. When doctors have completed all tasks, they might be sent on the task following a disaster, such as an earthquake.But why would a doctor____43_____ a comfortable life to join MSF?According to Chris, the experienceis a great help in your career. ____44_____, you need to keep an open mind and learn to communicate well with the people. Most importantly, at the ____45_____of each task,you have made a real difference to people’s lives.36. A. office B. factory C. shop D. school37. A. pleased B. simple C. easy D. dangerous38. A. plays against B. works for C. cares for D. agrees wih39. A. received B. created C. discovered D. chose40. A. shouldn’t B. have to C. can’t D. cant41. A. helpful B. faithful C. careful D. wonderful42. A. nurse B. worker C. doctor D. manager43. A. set up B. give up C. make up D. take up44. A. Finally B. Above all C. Anyway D.What’s more45. A. end B. beginning C. start D. middle第二节语法选择(共10小题,每小题1分,10分)26-30 CDBCA 31-35 BDCDD三、完形填空(共10小题,每小题1分,10分)36-40 ADBAB 41-45 ACBDA2015年6月越秀区八年级下学期期末区统考第二节语法选择(共10小题;每小题1分,满分10分)Food is very important. Everyone needs to eat ___26___ if he or she wants to have a strong body. Our minds also need ___27___ kind of food. This kind of food is knowledge .We begin to get knowledge even ___28___ we are very young. Small children are ___29___ in everything around them. They learn ___30___ while they are watching and listening. When they are getting older, they begin to read story books, science books, anything they like. When they find something new, they love to ask questions and ___31___ to find out answers. What is the best way to ___32___ knowledge? If we learn by ___33___,we will get littleknowlage. If we are always getting answers from ___34___ and do not ask why, we will never learn well. When we study ___35___ the right way, we will learn more and understand better .26. A. good B. well C. better D. best27. A. a B. an C. the D. /28. A. until B. after C. when D. so29. A. interest B. interested C. interesting D.more interesting30. A. everything B. anything C. nothing D. something31. A. try B. to try C. trying D. tried32. A. get B. got C. to get D. getting33. A. we B. us C. our D. ourselves34. A. other B. others C. the other D. another35. A. by B. from C. in D. with三、完形填空(共10小题;每小题1分,满分10分)Martin Henfield talks about some of his experience(经历) as a twin: when we were small my mother ___36___ us in the same clothes. That was ___37___ enough and we didn’t like it. But we went on our first camping trip, it was even worse. We were only ten years old, and while all the other boys went into their sleeping bags for the ___38___, we were not happy to snuggle(偎依) inside a double sleeping bag my mother made for us.At school our classmates ___39___ us Henfield One and Henfield Two, so people couldn’t even see our ___40___ according to our initials(首字母)because both of us were M.H. It was only when I went to college and began to have my own friends that I started to feel my own freedom of identity(身份).Before I went to college, during my secondary school holiday, I ___41___ a job as a worker on a building site. My twi n brother, Mike Henfield, didn’t work. One day I asked my boss,“ Can I have a week off?” “___42___,” he said,“ but you won’t have the job when you ___43___ back.” I didn’t want to___44___ the job. So on Monday morning, Mike went there in my hat, jacket and ___45____ and he worked for me for one week. None of them knew the difference.36. A.wore B.put C. dressed D.let37. A.good B.bad C.ugly D.strange38. A. day B. holiday C. night D. mid-night39. A.called B.knew C.told D.made40. A.face C.similarity D.difference41. A.received B.got C.paid D.made42. A.Certainly B.Never C.However D.Actually43. A.here B.there C.away D. back44. A.miss B.lose C.get D.do45. A.suit B.clothes C.dress D.trousers第二节语法选择(共10小题,每小题1分,10分)26-30 BACBD 31-35 ACDBC三、完形填空(共10小题,每小题1分,10分)36-40 CBCAD 41-45 BADBD2016-2017学年广东省广州市越秀区八年级(下)期末英语试卷(有答案)语法选择There would be a history exam and Phillip looked more and more worried.He (1)thesubject important since they began to study it this term.In class he always (2)about the football matches (3)Class Three and Class Two and tried to find out a way (4)Class Two.Of course he didn't hear (5)Mr.Beckman said.His friend Sally could help him with his homework and hint how he answered Mr.Beckman.But bad luck!The girl was ill in hospital and (6)would help him next Monday!Phillip thought hard and at last he found a way.He copied all the main points on his wristbands (袖口)of his shirt and then went to play football with his friends.(7)was Sunday yesterday.Even he didn't open his students'book,he was sure he would pass the exam.So he went on (8)football and watching TV.But this morning,when the boy was going to dress(9),he couldn't find his shirt.He jumped(10)the bed and began to look for it everywhere,(11)he failed.His mother brought his breakfast in and found his bedroom was in a fearful mess.She asked in(12),"What's the matter,son?" "I can't find my shirt!""You wore it for a week and I washed it when you fell (13)last night.""Who let you(14)it?"Phillip shouted (15).1.A.doesn't think B.didn't think C.hasn't thought D.hadn't thought2.A.think B.thought C.thinking D.thinks3.A.about B.inside C.among D.between4.A.to beat B.beating C.beat D.beats5.A.when B.how C.what D.who6.A.anybody B.nobody C.everybody D.somebody7.A.It B.This C.That D.There8.A.play B.plays C.to play D.playing9.A.it B.him C.himself D.them10.A.into B.off C.up D.inside11.A.when B.and C.so D.but12.A.surprise B.surprised C.surprising D.more surprised13.A.sleep B.asleep C.sleeping D.sleepless14.A.wash B.to wash C.washed D.washing15.A.angry B.angrier C.angrily D.more angrily.二、完形填空(共1小题;每小题1.5分,满分1.5分)I was cute,active and happy until that day when I was 15months old.I had a bad fall.I fell on a glass rabbit and it cut my eye badly enough to blind it.The doctor said that if the eye was (16),my face would become out of shape,so my scarred (有疤痕的),blind and grey eye lived on with me.People often asked uncomfortable questions about my eye or (17)played jokes on me.When the kids played games,I was always the"(18)guy."I knew that everyone looked down on me.Yet every time Mom noticed I was unhappy,she would say to me:"Hold your head up high and face the world."It helped me move on in life.As a (19),I thought Mom meant:"Be careful or you will fall down or knock into something because you are not looking."As a teenager,I always looked down to hide my shame,but I found that people (20)me when sometimes I held my head up high.In high school I was even made monitor,but outside of school I still felt like a freak (怪物).All I really wanted was to look like everyone else.When things got really bad,I would cry to my mom and shewould look at me with loving eyes and (21),"Hold your head up high and face the world.Let them see the (22)inside you."That is how Mom taught me pride.Mom's love and encouragement gave me the confidence to remove my own doubt.(23),I was able to look people in the eye.I learned not only to appreciate (欣赏)myself but to have deep love for others."Hold your head up high"has been (24)many times in my home.Each of my children has felt its (25).The gift she gave me lives on in my children.16.A.cared for B.taken care C.taken out D.brought back 17.A.still B.even C.almost D.hardly 18.A.bad B.good C.kind D.active 19.A.student B.person C.pioneer D.child 20.A.helped B.liked C.enjoyed D.hated 21.A.cry B.shout C.say D.speak 22.A.face B.fear C.anger D.love 23.A.Luckily B.Really C.Finally D.Suddenly 24.A.shouted B.repeated C.recorded D.discussed 25.A.power B.promise C.energy D.secret.2016-2017学年黄埔区初二(下)期末英语科试卷一、语法选择(共10小题每题1分满分10分)May was born in Heilongjiang Province in 1964. He father’s job was to look after red-crowned cranes. May started her job when she was young. She soon showed a great love __1__ these white birds. She looked after them __2__ in her family.When May was 21, she got __3__ job at a nature reserve in Jiangsu Province. She enjoyed __4__ care of baby cranes. If a bird became sick, she took care of it and stayed with it every day __5__ is was __6__ to fly again.In September 1987, one of __7__ went missing. The workers in the nature reserve looked __8__, but no one could find it. May was very worried. She looked for it day and night for two days. On the second night, while she__9__ for the missing bird, she fell into a river and died. She was only 23.Later, a song __10__ in memory of May. Though she died young, people always remember her when they hear the song or see a red-crowned crane.1. A. at B. in C. with D. for2. A. much carefully B. more careful C. the most carefully D.the most careful3. A. a B. the C. an D. 不填4. A. take B. to take C. taking D. taken5. A. but B. until C. because D. though6. A. strong enough B. so strong C. enough strong D. very strong7. A. a bird B. the birds C. bird D. birds8. A. everything B. anywhere C. somewhere D. nowhere9. A. looks B. looked C. was looking D. is looking10. A. wrote B. is written C. was writing D. was written二、完形填空(共10小题每小题1分共10分)How do you get on with your teachers? Every day, we spend hours with our teachers at school. We __11__ them, and they teach us how to be good people. The relationship between students and teachers is very important.Teachers care about our studies and lives, and it seems that they know everything about the __12__ they teach. They also have the right to decide who should be class leaders.So, many students want to be the teacher's pet. We __13__ teachers great respect. In class, we obey the rules and keep __14__ if the teacher doesn’t ask us to speak. When our teachers make a(n) __15__,we are afraid to point it out. Some of us don't contact teachers after class.At America __16__, the situation is a little different. Teachers and students are more like friends. __17__ a teacher by his or her name is common. In class, students express their opinions __18__ and challenge teachers when they don’t agree. If it turns out that a teacher makes a mistake, the teacher will say “ __19__” in front of the whole class. Students and teachers also communicate through Facebook or Twitter after class. They __20__ about studies and life experiences.Teachers are like our parents and our friends. So we should respect our teachers.11. A. learn about B. learn from C. come from D. hear about12. A. subjects B. sports C. activities D.marks13. A. send B. make C. tell D. show14. A. quiet B. noisy C. active D. sleepy15. A. impression B. difference C. promise D. mistake16. A. families B. offices C. schools D. shops17. A. Calling B. Asking C. Giving D. Speaking18. A. really B. quickly C. freely D. clearly19. A. bye B. thanks C. sorry D. yes20. A. worry B. talk C. say D. tell一、语法选择(共15 小题每题 1 分共共15 分)1-5 DCACB 6-10 ABACD二、完形填空(共10 小题每小题 1.5 分共共15 分)11-15 BADAD 16-20 CACCB2017年初二八下荔湾区英语期末考试卷一、语法选择(共15小题;每小题1分,满分15分)My teenage son Karl became quiet after his father died. As a single parent, I tried to do my hest 1 to him. But the more I tried, 2 he refused to make a change. 3 his report card arrived during his first junior year, it said that he had been absent (缺课) 95 times from classes and 4 six falling grades for the year. In this way he would never finish his studies. I sent him to the 5 of the school. I hoped that he could help my son. But nothing changed!I was at work one day when I got a phone call. A man introduced 6 as the headmaster. “I want to talk to you about Karl’s absences.” Before he could say 7 word, I started to cry and began to feel disappointed and 8 8for Karl. “I love my son, but I just don’t know 9 to do. I’ve tried everything to get Karl to go back to school 10 it didn’t work. It’s out of my hands”. For a moment there was silence on the other end of the line. Finally the headmaster 11 said. “Thank you for your time”, and he hung up.Karl’s next report can showed a great implement in his grades. 12 his last year, I attended a parent-teacher meeting with Karl. I noticed that his teachers were 13 at the progresses he had made. On our way home, he said, “Mum, do you 14 that call from the headmaster least year. That was me.I wanted to play 15 joke. But when I heard what you said, I felt I was hurting you so much. At that moment I knew I had to make you proud.”1. A. talk B. talked C. to talk D. talking2. A. many B. much C. more D. the more3. When B. While C. Before D. If4. A. has B. have C. had D. having5. A. advice B. advising C. advisement D. adviser6. A. him B. himself C. me D. myself7. A. ether B. the other C. another D. others8. A. sad B. sadder C. sadly D. more sadly9. A. where B. how C. why D. what10. A. so B. but C. as D. or11. A. serious B. more serious C. seriously D. more seriously12. A. By B. On C. In D. To13. A. surprise B. surprised C. surprising D. surprises14. A. remember B. remembers C. remembered D. remembering15. A.不填 B. the C. an D. a二、完形填空(共10小题;每小题1.5分,满分15分)Today it is quite natural to find people shake hands. People all over the world shake hands for many different 16 . We shake hands when we meet new people 17 during special festivals. Players often shake hands before or after 18 . Business people shake hands when they make a deal.Why do people shake hands 19 each other? It is because of the fact that a long time ago most people 20 knives or guns. If some of them decided that they did not want to 21 , they would show their empty hands. Perhaps people shook hands so that they could not 22 knives in their sleeves (袖子). Later on, handshaking became a symbol of 23 . Now we don’t have to 24 people with guns or knives. However, we still shake hands all the time! The reason is 25 — it is still a way to show friendship.16. A. ideas B. reasons C. impressions D. excuses17. A. or B. as C. but D. so18. A. programs B. speeches C. exercises D. games19. A. for B. to C. with D. at20. A. lost B. bought C. caught D. carried21. A. cheat B. drop C. fight D. speak22. A. hide B. life C. pull D. push23. A. success B. victory C. pride D. peace24. A. talk about B. worry about C. know about D. learn about25. A. unusual B. singe C. simple D. interesting南沙区2015-2016学年第二学期八年级学生学业水平测试。
【人教版】数学八年级下学期《期末检测题》附答案
2020-2021学年第二学期期末测试人教版数学八年级试题学校________ 班级________ 姓名________ 成绩________本试卷共25题.全卷满分120分.考试用时120分钟.一、选择题:本题共10小题,每小题3分,共30分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.若化成最简二次根式后,能与合并,则a的值不可以是()A.B.8 C.18 D.282.下列各组数中,是勾股数的是()A.0.3,0.4,0.5 B.6,8,10C.D.10,15,183.a=2019×2021﹣2019×2020,b=,c=,则a,b,c的大小关系是()A.a<b<c B.a<c<b C.b<a<c D.b<c<a4.如图,在水池的正中央有一根芦苇,池底长10尺,它高出水面1尺,如果把这根芦苇拉向水池一边,它的顶端恰好到达池边的水面则这根芦苇的长度是()A.10尺B.11尺C.12尺D.13尺5.如图,在正方形ABCD中,以对角线BD为边作菱形BDFE,连接BF,则∠AFB=()A.30°B.25°C.22.5°D.不能确定6.如图,周长为20的菱形ABCD中,点E、F分别在边AB、AD上,AE=2,AF=3,P为BD上一动点,则线段EP+FP长度的最小值为()A.3 B.4 C.5 D.67.如图,直线y=kx+b与x轴,y轴分别相交于点A(﹣3,0),B(0,2),则不等式kx+b>2的解集是()A.x>﹣3 B.x<2 C.x>0 D.x<28.某中学八(1)班8个同学在课间进行一分钟跳绳比赛,成绩(单位:个)如下:115,138,126,143,134,126,157,118.这组数据的众数和中位数分别是()A.126,126 B.126,130 C.130,134 D.118,1349.某班同学从学校出发去秋游,大部分同学乘坐大客车先出发,余下的同学乘坐小轿车20分钟后出发,沿同一路线行驶.客车中途停车等候5分钟,小轿车赶上来之后,大客车以原速度的继续行驶,小轿车保持速度不变.两车距学校的路程S(单位:km)和大客车行驶的时间t(单位:min)之间的函数关系如图所示.下列说法中正确的个数是()①学校到景点的路程为40km;②小轿车的速度是1km/min;③a=15;④当小轿车驶到景点入口时,大客车还需要15分钟才能到达景点入口.A.1个B.2个C.3个D.4个10.如图①,在▱ABCD中,动点P从点B出发,沿折线B→C→D→B运动,设点P经过的路程为x,△ABP的面积为y,把y看作x的函数,函数的图象如图②所示,则图②中的a等于()A.3B.4C.14 D.18二、填空题:本题共7小题,每小题3分,共21分.11.某小组七位学生的中考体育测试成绩(满分40分)依次为37,40,39,37,40,38,40.则这组数据的中位数是.12.若代数式有意义,则x的取值范围是13.如图,AD∥BC,∠ABC的角平分线BP与∠BAD的角平分线AP相交于点P,作PE⊥AB于点E,若PE=3,则两平行线AD与BC间的距离为.14.如图,△ABC中,∠ACB=90°,AC=6,BC=8,P为直线AB上一动点,连PC.(1)线段PC的最小值是.(2)当PC=5时,AP长是.15.已知一次函数y=kx+3﹣2k,当k变化时,原点到一次函数y=kx+(3﹣2k)的图象的最大距离为.16.A,B两地相距240km,甲货车从A地以40km/h的速度匀速前往B地,到达B地后停止.在甲出发的同时,乙货车从B地沿同一公路匀速前往A地,到达A地后停止.两车之间的路程y(km)与甲货车出发时间x(h)之间的函数关系如图中的折线CD﹣DE﹣EF所示.其中点C的坐标是(0,240),点D的坐标是(2.4,0),则点E的坐标是.17.如图,在直角坐标系中,直线y=x+4分别交x轴,y轴于A,B两点,C为OB的中点,点D在第二象限,且四边形AOCD为矩形,P是CD上一个动点,过点P作PH⊥OA于H,Q是点B关于点A的对称点,则BP+PH+HQ的最小值为.三、解答题:共69分.解答应写出文字说明、证明过程或演算步骤.考生根据要求作答.18.计算:×﹣(+1)2.19.已知:a=+2,b=﹣2.(1)求ab.(2)求a2+b2﹣ab.20.已知函数y=kx+,当x=1时,y=7;当x=2时,y=8.(1)求y与x之间的函数关系式;(2)当x=4时,求y的值.21.如图,在四边形ABCD中,AB=CD,E、F分别是BC、AD的中点,连结EF并延长,分别与BA,CD的延长线交于点M、N,证明:∠BME=∠CNE.22.某校开展爱“我容城,创卫同行”的活动,倡议学生利用双休日在浜江公园参加评选活动,为了了解同学们劳动时间,学校随机调查了部分同学劳动的时间,并用得到的数据绘制了不完整的统计图,根据图中信息解答下列问题:(1)将条形统计图补充完整;(2)抽查的学生劳动时间的众数为中位数为.(3)已知全校学生人数为1200人,请估算该校学生参加义务劳动2小时的有多少人?23.在平面直角坐标系xOy中,A(0,4),B(2,0),C(5,1),D(2,5).(1)AD=,AB=;(2)∠BAD是直角吗?请说出理由;(3)求点B到直线CD的距离.24.如图,在Rt△ABC中,∠ACB=90°,点D是AB上的一点,连接CD,CE∥AB,BE∥CD,且CE=AD.(1)求证:四边形BDCE是菱形;(2)过点E作EF⊥BD,垂足为点F,若点F是BD的中点,EB=6,求BC的长.25.如图,矩形ABCO中,点C在y轴上,点A在x轴上,点B的坐标是(﹣8,﹣6),矩形ABCO沿直线BD折叠,使得点A落在对角线OB上的点E处,折痕与OA、y轴分别交于点D、F.(1)求线段BO的长;(2)求直线BF的解析式;(3)若点N是平面内任一点,在x轴上是否在点M,使得M、N、E、O为顶点的四边形是菱形?若存在,请直接写出满足条件的点M的坐标;若不存在,请说明理由.参考答案一、选择题:本题共10小题,每小题3分,共30分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.若化成最简二次根式后,能与合并,则a的值不可以是()A.B.8 C.18 D.28【答案】D【分析】根据二次根式的性质把各个二次根式化简,根据同类二次根式的概念判断即可.【解答】解:A、=,能与合并,a的值可以是,本选项不符合题意;B、==2,能与合并,a的值可以是8,本选项不符合题意;C、==3,能与合并,a的值可以是18,本选项不符合题意;D、==2,不能与合并,a的值不可以是28,本选项符合题意;故选:D.【知识点】最简二次根式、同类二次根式、二次根式有意义的条件2.下列各组数中,是勾股数的是()A.0.3,0.4,0.5 B.6,8,10C.D.10,15,18【答案】B【分析】利用勾股数定义进行分析即可.【解答】解:A、0.3,0.4,0.5不是正整数,不是勾股数,故此选项不合题意;B、62+82=102,都是正整数,是勾股数,故此选项符合题意;C、,,不是正整数,不是勾股数,故此选项不合题意;D、102+152≠182,不是勾股数,故此选项不合题意;故选:B.【知识点】勾股数3.a=2019×2021﹣2019×2020,b=,c=,则a,b,c的大小关系是()A.a<b<c B.a<c<b C.b<a<c D.b<c<a【答案】A【分析】利用平方差公式计算a,利用完全平方公式和二次根式的化简求出b,利用二次根式大小的比较办法,比较b、c得结论.【解答】解:a=2019×2021﹣2019×2020=(2020﹣1)(2020+1)﹣(2020﹣1)×2020=20202﹣1﹣20202+2020=2019;∵20222﹣4×2021=(2021+1)2﹣4×2021=20212+2×2021+1﹣4×2021=20212﹣2×2021+1=(2021﹣1)2=20202,∴b=2020;∵>,∴c>b>a.故选:A.【知识点】实数大小比较、二次根式的乘除法、二次根式的性质与化简4.如图,在水池的正中央有一根芦苇,池底长10尺,它高出水面1尺,如果把这根芦苇拉向水池一边,它的顶端恰好到达池边的水面则这根芦苇的长度是()A.10尺B.11尺C.12尺D.13尺【答案】D【分析】找到题中的直角三角形,设水深为x尺,根据勾股定理解答.【解答】解:设水深为x尺,则芦苇长为(x+1)尺,根据勾股定理得:x2+()2=(x+1)2,解得:x=12,芦苇的长度=x+1=12+1=13(尺),故选:D.【知识点】勾股定理的应用5.如图,在正方形ABCD中,以对角线BD为边作菱形BDFE,连接BF,则∠AFB=()A.30°B.25°C.22.5°D.不能确定【答案】C【分析】根据正方形的对角线平分一组对角可得∠ADB=45°,再根据菱形的四条边都相等可得BD=DF,根据等边对等角可得∠DBF=∠DFB,然后根据三角形的一个外角等于与它不相邻的两个内角的和进行计算即可得解.【解答】解:在正方形ABCD中,∠ADB=∠ADC=×90°=45°,在菱形BDFE中,BD=DF,所以,∠DBF=∠AFB,在△BDF中,∠ADB=∠DBF+∠AFB=2∠AFB=45°,解得∠AFB=22.5°.故选:C.【知识点】正方形的性质、菱形的性质6.如图,周长为20的菱形ABCD中,点E、F分别在边AB、AD上,AE=2,AF=3,P为BD上一动点,则线段EP+FP长度的最小值为()A.3 B.4 C.5 D.6【答案】C【分析】在DC上截取DG=FD=AD﹣AF=4﹣3=1,连接EG,则EG与BD的交点就是P.EG的长就是EP+FP的最小值,据此即可求解.【解答】解:∵四边形ABCD是菱形,周长为20,∴AD=20,在DC上截取DG=FD=AD﹣AF=5﹣3=2,连接EG,EG与BD交于点P′,连接P′F,此时P′E+P′F的值最小,最小值=EG的长,∵AE=DG=2,且AE∥DG,∴四边形ADGE是平行四边形,∴EG=AD=5.故选:C.【知识点】菱形的性质、轴对称-最短路线问题7.如图,直线y=kx+b与x轴,y轴分别相交于点A(﹣3,0),B(0,2),则不等式kx+b>2的解集是()A.x>﹣3 B.x<2 C.x>0 D.x<2【答案】C【分析】根据图象和B的坐标得出即可.【解答】解:∵直线y=kx+b和y轴的交点是B(0,2),∴不等式kx+b>2的解集是x>0,故选:C.【知识点】一次函数的性质、一次函数与一元一次不等式8.某中学八(1)班8个同学在课间进行一分钟跳绳比赛,成绩(单位:个)如下:115,138,126,143,134,126,157,118.这组数据的众数和中位数分别是()A.126,126 B.126,130 C.130,134 D.118,134【答案】B【分析】先将这组数据重新排列,再根据众数和中位数的概念求解即可.【解答】解:将这组数据重新排列为115,118,126,126,134,138,143,157,所以这组数据的众数为126,中位数为=130,故选:B.【知识点】中位数、众数9.某班同学从学校出发去秋游,大部分同学乘坐大客车先出发,余下的同学乘坐小轿车20分钟后出发,沿同一路线行驶.客车中途停车等候5分钟,小轿车赶上来之后,大客车以原速度的继续行驶,小轿车保持速度不变.两车距学校的路程S(单位:km)和大客车行驶的时间t(单位:min)之间的函数关系如图所示.下列说法中正确的个数是()①学校到景点的路程为40km;②小轿车的速度是1km/min;③a=15;④当小轿车驶到景点入口时,大客车还需要15分钟才能到达景点入口.A.1个B.2个C.3个D.4个【答案】C【分析】根据题意和函数图象中的数据可以判断各个小题中的结论是否正确,本题得以解决.【解答】解:由图象可知,学校到景点的路程为40km,故①正确,小轿车的速度是:40÷(60﹣20)=1km/min,故②正确,a=1×(35﹣20)=15,故③正确,大客车原来的速度为:15÷30=0.5km/min,后来的速度为:0.5×=(km/min),当小轿车驶到景点入口时,大客车还需要:(40﹣15)÷﹣(40﹣15)÷1=10分钟才能达到景点入口,故④错误,故选:C.【知识点】一次函数的应用10.如图①,在▱ABCD中,动点P从点B出发,沿折线B→C→D→B运动,设点P经过的路程为x,△ABP的面积为y,把y看作x的函数,函数的图象如图②所示,则图②中的a等于()A.3B.4C.14 D.18【答案】A【分析】由图②知,BC=6,CD=14﹣6=8,BD=18﹣14=4,再通过解直角三角形,求出△CBD高,进而求解.【解答】解:由图②知,BC=6,CD=14﹣6=8,BD=18﹣14=4,过点B作BH⊥DC于点H,设CH=x,则DH=8﹣x,则BH2=BC2﹣CH2=BD2﹣DH2,即:BH2=42﹣(8﹣x)2=62﹣x2,解得:BH=,则a=y=S△ABP=DC×HB=×8×=3,故选:A.【知识点】动点问题的函数图象二、填空题:本题共7小题,每小题3分,共21分.11.某小组七位学生的中考体育测试成绩(满分40分)依次为37,40,39,37,40,38,40.则这组数据的中位数是.【答案】39【分析】把数据按从小到大的顺序排列,位于最中间的一个数或两个数的平均数为中位数,由此即可确定这组数据中位数.【解答】解:把这组数据从小到大排序后为37,37,38,39,40,40,40,其中第四个数据为39,所以这组数据的中位数为39.故答案为39.【知识点】中位数12.若代数式有意义,则x的取值范围是【分析】根据二次根式的性质,被开方数大于等于0;分母中有字母,分母不为0.【解答】解:若代数式有意义,必有解得﹣3≤x<且x≠﹣2.【知识点】二次根式有意义的条件13.如图,AD∥BC,∠ABC的角平分线BP与∠BAD的角平分线AP相交于点P,作PE⊥AB于点E,若PE=3,则两平行线AD与BC间的距离为.【答案】6【分析】作PF⊥AD于F,PG⊥BC于G,根据角平分线的性质得到PF=PE=3,PG=PE=3,根据平行线间的距离的求法计算即可.【解答】解:作PF⊥AD于F,PG⊥BC于G,∵AP是∠BAD的角平分线,PF⊥AD,PE⊥AB,∴PF=PE=3,∵BP是∠ABC的角平分线,PE⊥AB,PG⊥BC,∴PG=PE=3,∵AD∥BC,∴两平行线AD与BC间的距离为PF+PG=6,故答案为:6.【知识点】平行线之间的距离、角平分线的性质14.如图,△ABC中,∠ACB=90°,AC=6,BC=8,P为直线AB上一动点,连PC.(1)线段PC的最小值是.(2)当PC=5时,AP长是.【答案】【第1空】4.8【第2空】5或2.2【分析】(1)当PC⊥AB时,PC的值最小,利用面积法求解即可;(2)过C作CQ⊥BC于Q,同(1)得CQ=4.8,由勾股定理求出AQ=3.6,PQ=1.4,当P在线段BQ上时,AP=AQ+PQ=5;当P在线段AQ上时,AP=AQ﹣PQ=2.2.【解答】解:(1)在Rt△ABC中,∠ACB=90°,AC=6,BC=8,∴AB===10,由垂线段最短得:当PC⊥AB时,PC的值最小,此时,△ABC的面积=•AB•PC=•AC•BC,∴AB•PC=AC•BC,∴PC===4.8,故答案为:4.8;(2)过C作CQ⊥BC于Q,如图所示:同(1)得:CQ=4.8,由勾股定理得:AQ===3.6,PQ===1.4,当P在线段BQ上时,AP=AQ+PQ=3.6+1.4=5;当P在线段AQ上时,AP=AQ﹣PQ=3.6﹣1.4=2.2;综上所述,AP的长为5或2.2,故答案为:5或2.2.【知识点】勾股定理、垂线段最短15.已知一次函数y=kx+3﹣2k,当k变化时,原点到一次函数y=kx+(3﹣2k)的图象的最大距离为.【分析】根据一次函数图象过定点A(2,3),即可得到OA=为最大距离.【解答】解:一次函数y=(x﹣2)k+3中,令x=2,则y=3,∴一次函数图象过定点A(2,3),∴OA=为最大距离.故答案为:.【知识点】一次函数的性质、一次函数的图象16.A,B两地相距240km,甲货车从A地以40km/h的速度匀速前往B地,到达B地后停止.在甲出发的同时,乙货车从B地沿同一公路匀速前往A地,到达A地后停止.两车之间的路程y(km)与甲货车出发时间x(h)之间的函数关系如图中的折线CD﹣DE﹣EF所示.其中点C的坐标是(0,240),点D的坐标是(2.4,0),则点E的坐标是.【答案】(4,160)【分析】根据点C与点D的坐标即可得出乙货车的速度,进而得出乙货车从B地到A地所用时间,据此即可得出点E的坐标.【解答】解:根据题意可得,乙货车的速度为:240÷2.4﹣40=60(km/h),∴乙货车从B地到A地所用时间为:240÷60=4(小时),当乙货车到达A地时,甲货车行驶的路程为:40×4=160(千米),∴点E的坐标是(4,160).故答案为:(4,160).【知识点】一次函数的应用17.如图,在直角坐标系中,直线y=x+4分别交x轴,y轴于A,B两点,C为OB的中点,点D在第二象限,且四边形AOCD为矩形,P是CD上一个动点,过点P作PH⊥OA于H,Q是点B关于点A的对称点,则BP+PH+HQ的最小值为.【分析】根据直线y=x+4先确定OA和OB的长,证明四边形PHOC是矩形,得PH=OC=BC=2,再证明四边形PBCH是平行四边形,则BP=CH,在BP+PH+HQ中,PH=2是定值,所以只要CH+HQ 的值最小就可以,当C、H、Q在同一直线上时,CH+HQ的值最小,利用平行四边形的性质求出即可.【解答】解:如图,连接CH,∵直线y=x+4分别交x轴,y轴于A,B两点,∴OB=4,OA=3,∵C是OB的中点,∴BC=OC=2,∵∠PHO=∠COH=∠DCO=90°,∴四边形PHOC是矩形,∴PH=OC=BC=2,∵PH∥BC,∴四边形PBCH是平行四边形,∴BP=CH,∴BP+PH+HQ=CH+HQ+2,要使CH+HQ的值最小,只须C、H、Q三点共线即可,∵点Q是点B关于点A的对称点,∴Q(﹣6,﹣4),又∵点C(0,2),根据勾股定理可得CQ==6,此时,BP+PH+HQ=CH+HQ+PH=CQ+2=6+2,即BP+PH+HQ的最小值为6+2;故答案为:6+2.【知识点】一次函数综合题三、解答题:共69分.解答应写出文字说明、证明过程或演算步骤.考生根据要求作答.18.计算:×﹣(+1)2.【分析】根据根式的乘法和完全平方公式化成最简二次根式,再合并即可.【解答】解:×﹣(+1)2=﹣[()2+2+1]=﹣3﹣2﹣1=2﹣3﹣2﹣1=﹣4.【知识点】二次根式的混合运算19.已知:a=+2,b=﹣2.(1)求ab.(2)求a2+b2﹣ab.【分析】(1)根据平方差公式、二次根式的乘法法则计算;(2)根据二次根式的加法法则求出a+b,根据完全平方公式把原式变形,把a+b、ab的值代入计算即可.【解答】解:(1)ab=(+2)(﹣2)=()2﹣22=5﹣4=1;(2)∵a=+2,b=﹣2,∴a+b=(+2)+(﹣2)=2,∴a2+b2﹣ab=a2+2ab+b2﹣3ab=(a+b)2﹣3ab=(2)2﹣3×1=17.【知识点】二次根式的化简求值、分母有理化20.已知函数y=kx+,当x=1时,y=7;当x=2时,y=8.(1)求y与x之间的函数关系式;(2)当x=4时,求y的值.【分析】(1)直接把已知x,y的值代入解方程组得出答案;(2)利用(1)中所求把x的值代入求出答案.【解答】解:(1)∵函数y=kx+,当x=1时,y=7;当x=2时,y=8,∴,解得:,故y与x之间的函数关系式为:y=3x+;(2)当x=4时,y=3×4+=13.【知识点】函数值21.如图,在四边形ABCD中,AB=CD,E、F分别是BC、AD的中点,连结EF并延长,分别与BA,CD的延长线交于点M、N,证明:∠BME=∠CNE.【分析】连结BD,取BD的中点H,连结HE,HF,根据三角形的中位线的性质得到FH∥BM,FH=AB,EH∥CN,EH=CD,根据平行线的性质得到∠BME=∠HFE,∠CNE=∠HEF,根据等腰三角形的性质得到∠HFE=∠HEF,等量代换即可得到结论.【解答】证明:连结BD,取BD的中点H,连结HE,HF,∵E、F分别是BC、AD的中点,∴FH∥BM,FH=AB,EH∥CN,EH=CD,∴∠BME=∠HFE,∠CNE=∠HEF,∵AB=CD,∴FH=EH,∴∠HFE=∠HEF,∴∠BME=∠CNE.【知识点】三角形中位线定理22.某校开展爱“我容城,创卫同行”的活动,倡议学生利用双休日在浜江公园参加评选活动,为了了解同学们劳动时间,学校随机调查了部分同学劳动的时间,并用得到的数据绘制了不完整的统计图,根据图中信息解答下列问题:(1)将条形统计图补充完整;(2)抽查的学生劳动时间的众数为中位数为.(3)已知全校学生人数为1200人,请估算该校学生参加义务劳动2小时的有多少人?【答案】【第1空】1.5【第2空】1.5【分析】(1)根据学生劳动“1小时”的人数除以占的百分比,求出总人数,再用总人数减去学生劳动“0.5小时”、“1小时”、“2小时”的人数,得出学生劳动“1.5小时”的人数,从而补全条形图;(2)根据统计图中的数据确定出学生劳动时间的众数与中位数即可;(3)总人数乘以样本中参加义务劳动2小时的百分比即可得.【解答】解:(1)根据题意得:30÷30%=100(人),∴学生劳动时间为“1.5小时”的人数为100﹣(12+30+18)=40(人),补全统计图,如图所示:(2)根据题意得:抽查的学生劳动时间的众数为1.5小时、中位数为1.5小时,故答案为:1.5,1.5;(3)1200×=216,答:估算该校学生参加义务劳动2小时的有216人.【知识点】中位数、全面调查与抽样调查、众数、条形统计图、用样本估计总体23.在平面直角坐标系xOy中,A(0,4),B(2,0),C(5,1),D(2,5).(1)AD=,AB=;(2)∠BAD是直角吗?请说出理由;(3)求点B到直线CD的距离.【分析】(1)直接根据两点间的距离公式可求出AD及AB的长即可;(2)连接BD,根据勾股定理的逆定理进行判断即可;(3)过点B作BE⊥CD于点E,作CG⊥x轴于点G,根据三角形的面积公式求出BE的长即可.【解答】解:(1)∵A(0,4),B(2,0),C(5,1),D(2,5).∴AD==;AB===2.故答案为:,2;(2)∠BAD是直角.理由:连接BD,∵B(2,0),D(2,5),∴BD=5﹣0=5.∵由(1)知AD=,AB=2,∴AD2=5,AB2=20,BD2=25,∴AD2+AB2=BD2,∴∠BAD是直角;(3)过点B作BE⊥CD于点E,作CG⊥x轴于点G,∵C(5,1),D(2,5),∴CD==5,∵B(2,0),D(2,5).∴BD⊥x轴,BG=5﹣2=3,CG=1,∴S△BCD=S梯形DBGC﹣S△BCG,即×5BE=(1+5)×3﹣×1×3,解得BE=3.答:点B到直线CD的距离为3.【知识点】勾股定理、勾股定理的逆定理、坐标与图形性质24.如图,在Rt△ABC中,∠ACB=90°,点D是AB上的一点,连接CD,CE∥AB,BE∥CD,且CE=AD.(1)求证:四边形BDCE是菱形;(2)过点E作EF⊥BD,垂足为点F,若点F是BD的中点,EB=6,求BC的长.【分析】(1)先证明四边形BDCE是平行四边形,得出CE=BD,证出BD=CD,由直角三角形斜边上的中线性质得出CD=AB=BD,即可得出四边形BDCE是菱形;(2)连接DE,由菱形的性质得出BC⊥DE,BD=BE,OB=OC,由线段垂直平分线的性质得出BE=DE,证出BE=DE=BD,由等边三角形和菱形的性质得出∠EBC=∠EBD=30°,求出OE=EB=3,由勾股定理求出OB,即可得出结果.【解答】(1)证明:∵CE∥AB,BE∥CD,∴四边形BDCE是平行四边形,∴CE=BD,∵CE=AD,∴BD=AD,又∵∠ACB=90°,∴CD=AB=BD,∴四边形BDCE是菱形;(2)解:连接DE,如图所示:由(1)得:四边形BDCE是菱形,∴BC⊥DE,BD=BE,OB=OC,∵EF⊥BD,点F是BD的中点,∴BE=DE,∴BE=DE=BD,∴∠DBE=60°,∠EBC=∠EBD=30°,∴OE=EB=3,∴OB===3,∴BC=2OB=6.【知识点】菱形的判定25.如图,矩形ABCO中,点C在y轴上,点A在x轴上,点B的坐标是(﹣8,﹣6),矩形ABCO沿直线BD折叠,使得点A落在对角线OB上的点E处,折痕与OA、y轴分别交于点D、F.(1)求线段BO的长;(2)求直线BF的解析式;(3)若点N是平面内任一点,在x轴上是否在点M,使得M、N、E、O为顶点的四边形是菱形?若存在,请直接写出满足条件的点M的坐标;若不存在,请说明理由.【分析】(1)由勾股定理求出BO即可;(2)由待定系数法求出直线BF的解析式即可;(3)分情况讨论:①当OM、OE都为菱形的边时,OM=OE=4,得出M的坐标为(4,0)或(﹣4,0);②当OM为菱形的对角线,OE为边时,同②得(﹣,0);③当OM为菱形的边,OE为对角线时,MN垂直平分OE,垂足为G,由勾股定理求出OM即可.【解答】解:(1)∵四边形ABCO是矩形,点B的坐标是(﹣8,﹣6),∴∠OAB=∠OCB=90°,OA=BC=8,AB=CO=6,∴BO===10;(2)由折叠的性质得:BE=AB=6,DE=DA,∠DEB=∠DAB=90°,∴∠DEO=90°,OE=BO﹣BE=10﹣6=4.设OD=a,则DA=DE=8﹣a,在Rt△EOD中,DE2+OE2=OD2,即(8﹣a)2+42=a2,解得:a=5,∴D(﹣5,0),设直线BF的解析式为y=kx+b,把B(﹣8,﹣6),D(﹣5,0)代入得:,解得:,∴直线BF的解析式为y=2x+10;(3)存在,理由如下:①当OM、OE都为菱形的边时,OM=OE=4,∴M的坐标为(4,0)或(﹣4,0);②当OE为菱形的边,OM为菱形的对角线时,如图1所示:设直线OB解析式为:y=kx,由点B(﹣8,﹣6)在图象上可知:﹣6=﹣8k,∴k=,则直线OB解析式为y=x,设点E(x,x),在Rt△EOG中,OG2+GE2=OE2,即:x2+(x)2=16,解得:x=±,∵点E在第三象限,∴x=﹣,∴点M(﹣,0);③当OM为菱形的边,OE为对角线时,MN垂直平分OE,垂足为G,作EP⊥OA于P,如图2所示:由②得:E(﹣,﹣),则OP=,EP=,在Rt△PEM中,由勾股定理得:(﹣OM)2+()2=EM2,∵OM=EM,∴(﹣OM)2+()2=OM2,解得:OM=,∴点M的坐标为(﹣,0);综上所述,在x轴上存在点M,使得M、N、E、O为顶点的四边形是菱形,点M的坐标为(4,0)或(﹣4,0)或(﹣,0)或(﹣,0).【知识点】一次函数综合题。
全科医学专业知识考试题(含参考答案)
全科医学专业知识考试题(含参考答案)一、单选题(共100题,每题1分,共100分)1.持续高热39~40℃,24小时内体温波动范围不超过1℃,称为A、间歇热B、驰张热C、回归热D、波状热E、稽留热正确答案:E答案解析:稽留热:体温恒定地维持在39~40℃以上高水平达数天或数周,以小时内体温波动范围不超过1℃。
常见于大叶性肺炎、斑疹伤寒、伤寒向热期。
2.ALI/ARDS(急性肺损伤/急性呼吸窘迫综合征)最早出现的症状是A、代谢性酸中毒B、X线大片状浸润阴影C、低氧血症D、呼吸加快,并呈进行性加重E、粉红色泡沫样痰正确答案:D答案解析:ALI/ARDS最早出现的症状为呼吸加快,并呈进行性加重的呼吸困难,发绀,常伴有烦躁、焦虑、出汗等。
3.患者,男性,68岁。
有高血压病史10年,突发胸部撕裂样疼痛,向后背部放射。
查体:BP190/120mmHg,心电图提示,V1~V3导联ST 段抬高。
下列处理措施错误的是A、阿司匹林300mgB、低分子肝素C、血管紧张素转换酶抑制剂D、静脉内溶栓E、吗啡5mg静脉注射正确答案:D4.寨卡病毒病的临床表现有A、发热、皮疹B、结膜炎C、关节、肌肉痛D、恶心、呕吐E、以上都是正确答案:E5.腹股沟斜疝的疝囊颈位于A、腔隙韧带外侧,腹股沟韧带上方B、腹壁下动脉内侧,腹股沟韧带上方C、腹壁浅动外侧,腹股沟韧带上方D、腹壁下动脉外侧,腹股沟韧带上方E、腹壁浅动脉内侧,腹股沟韧带上方正确答案:D6.关于Auer小体,正确的是A、主要见于急性非淋巴细胞白血病B、主要见于急性淋巴细胞白血病C、主要见于慢性粒细胞白血病D、主要见于慢性淋巴细胞白血病E、主要见于类白血病反应正确答案:A7.患者,女性,22岁。
无意中发现颈部增粗已2个月,无明显怕热、出汗及心情改变,妊娠3个多月。
门诊检查双侧甲状腺轻度弥漫性肿大,质软无明显结节,淋巴结未扪及,BMR25%。
最大的可能是A、结节性甲状腺肿B、生理性甲状腺肿C、继发性甲亢D、甲状腺癌E、甲状腺腺瘤正确答案:B8.患者,男性,62岁,持续性肝区胀痛半年,AFP600ng/ml。
2019-2020学年河北省石家庄四十中八年级(下)期末物理试卷(附答案详解)
2019-2020学年河北省石家庄四十中八年级(下)期末物理试卷一、单选题(本大题共10小题,共40.0分)1.下列估测最接近实际的是()A. 人跳绳的功率一般为300WB. 步行速度约为1.1km/ℎC. 人走路时对地面的压强约为1.5×104PaD. 初中生从一楼上到二楼所做的功约为150J2.在凉山州举行的中小学运动会中,来自各校的运动员们奋力拼搏,取得了优异的成绩。
比赛中涉及一些物理现象,下列说法正确的是()A. 乒乓球比赛时,球在空中飞行,所有力全部消失,球一定落向地面B. 百米比赛时,运动员冲线后不能立即停下,是因为运动员受到惯性力的作用C. 跳远比赛时,运动员需要助跑,是为了增大惯性,跳得更远D. 足球比赛时,抱在守门员手中的足球也具有惯性3.下列说法正确的是()A. 一个物体也能产生力的作用B. 滑动摩擦力的方向总是与运动方向相反C. 重力的方向是垂直向下的D. 在弹性限度内,弹簧伸长的长度与弹簧受到的拉力成正比4.甲起重机将一台机器沿竖直方向向上以10m/s的速度匀速提升,甲起重机对机器的拉力为F1;乙起重机将同一台机器沿竖直方向向下以4m/s的速度匀速下降,乙起重机对机器的拉力为F2,则()A. F1>F2B. F1=F2C. F1<F2D. 无法确定5.如图所示,用F=10N水平向右的拉力匀速拉动物块A时,物块B相对于地面静止不动,此时弹簧测力计的示数为8N,则物块B所受摩擦力的大小及方向为()A. 10N,水平向右B. 10N,水平向左C. 8N,水平向左D. 8N,水平向右6.下列说法不正确的是()A. 剪刀有锋利的刃,可以增大压强B. 大气压随高度的增加而升高C. 船闸工作时,应用了连通器的原理D. 潜水员深潜时要穿潜水服,以防水压过大压坏胸腔7.如图所示,一名运动员投掷铅球的过程示意图,铅球在b点离手,c点是铅球移动的最高点,不计空气阻力,下列说法不正确的是()A. 只有在a到b的过程中,运动员对铅球做了功B. 在a到d的过程中,铅球的运动状态在不断的变化C. 在c到d的过程中,铅球的重力势能减少D. 在b到d的过程中,铅球的机械能先增加后减少8.如图所示,在“探究影响压力作用效果的因素”的实验中,下列说法正确的是()①甲、乙两次实验中,小桌对海绵压力的大小相等②甲图中小桌对海绵压力作用的效果比乙图中的明显③甲、乙两次实验,说明压力作用的效果跟压力的大小有关④为了完成整个实验,可以将乙图中的砝码取下来,并将看到的实验现象和甲图中的对比A. ①②B. ①②④C. ①③④D. ②③④9.如图为盆景的—个自动供水装置。
2024年河北省石家庄市四十中学八年级下册物理期末达标检测试题含解析
2024年河北省石家庄市四十中学八年级下册物理期末达标检测试题注意事项1.考生要认真填写考场号和座位序号。
2.试题所有答案必须填涂或书写在答题卡上,在试卷上作答无效。
第一部分必须用2B 铅笔作答;第二部分必须用黑色字迹的签字笔作答。
3.考试结束后,考生须将试卷和答题卡放在桌面上,待监考员收回。
一、单选题1.下列实例中减少摩擦的方法与其它三个不同的是A.磁悬浮列车B.滚动轴承C.门轴折页加润滑油D.气垫船2.下面是我们生活中常见的几种现象:①用力揉面团,面团形状发生变化;②篮球撞击在篮板上被弹回;③用力握小皮球,球变瘪了;④一阵风把地面上的树叶吹得漫天飞舞。
在这些现象中,物体因为受力而改变运动状态的是A.①②B.②③C.③④D.②④3.下列四个实例中,目的是为了增大压强的是A.高铁的铁轨铺在枕木上B.《流浪地球》里的车有多个车轮C.切瓜神器的切片很薄D.旅行包的提手处做得很宽大4.如图甲所示,将双面吸盘面积小的一面紧贴在竖直玻璃上.挂上锅铲后静止;如图乙所示,将该吸盘面积大的一面紧贴在竖直玻璃上,挂上同一锅铲后静止.在甲、乙两图中,吸盘对玻璃的压力分别为F甲、F乙,玻璃对吸盘的摩擦力分别为f甲、f乙.下列关系式均正确的是()A.F甲< F乙,f甲< f乙B.F甲= F乙,f甲= f乙C.F甲> F乙,f甲> f乙D.F甲< F乙,f甲= f乙5.下列有关托里拆利实验的说法中正确的是()A.该实验首次得出1标准大气压强相当于76mm汞柱产生的压强B.实验中,当倒插在水银槽中的玻璃管从竖直开始慢慢倾斜时,管内的水银柱高度不会发生变化(管足够长)C.实验中不小心让少量空气漏入了管内,则测得的大气压应比真实值大D.灭火器和氧气瓶上的气压计,其制造原理与托里拆利实验原理相同6.在甲、乙两个完全相同的玻璃缸中装满水,缸中水面分别漂浮着一只玩具鸭,如图所示.设甲、乙两缸底受到水的压强分别为p甲、p乙,两只玩具鸭受到的浮力分别为F甲、F乙,下列判断正确的是()A.p甲>p乙B.p甲<p乙C.F甲>F乙D.F甲<F乙7.跳绳是大家喜爱的体育运动之一,小明的质量为50 kg,每次跳起高度约为6 cm(人整体上升,如图所示),一分钟跳100 次,下列说法正确的是()A.向上起跳过程中小明的动能持续增大B.下落过程中小明的重力势能保持不变C.小明跳一次克服重力做功约3J D.小明在这一分钟内跳绳的功率约为50W8.下列物理量最接近实际的是()A.一个普通鸡蛋的质量约为50g B.汕头夏天的最高气温约为50℃C.初中学生课桌的高度约为0.7dm D.光在空气中的传播速度约为340m/s二、多选题9.自行车是我们熟悉的交通工具。
2023北京昌平区初二(下)期末数学试题及答案
2023北京昌平初二(下)期末数 学一、选择题(共16分,每题2分)下列各题均有4个选项,其中只有一个是符合题意的.1.中国传统文化博大精深,下面四个图形中既是轴对称图形又是中心对称图形的是( )A .京剧脸谱B .剪纸对鱼C .中国结D .风筝燕归来2.在平面直角坐标系中,若点P 的坐标为()3,2-,则点P 所在的象限是( )A .第一象限B .第二象限C .第三象限D .第四象限3.下列图象中,y 不是x 的函数的是( )A .B .C .D .4.如下表记录了甲、乙、丙、丁四名跳高运动员最近几次选拔赛成绩的平均数与方差:甲乙丙丁平均数(cm )185180185180方差3.6 3.67.48.1根据表中数据,要从中选择一名成绩好且发挥稳定的运动员参加比赛,你认为最合适的运动员是( )A .甲B .乙C .丙D .丁5.一个多边形的内角和等于它外角和的2倍,这个多边形是( )A .三角形B .四边形C .五边形D .六边形6.下列方程中有两个不相等的实数根的方程是( )A .2440x x -+=B .2510x x --=C .2230x x -+=D .2220x x -+=7.初二某班第一次体育机考模拟测试平均分为95分,经过专业的体育指导和训练后,在之后的第二次和第三次体育模拟测试中,班级平均分稳步提升,第三次体育模拟测试平均分达到99分,设该班每次测试班级平均分较上次的增长率相同,均为x ,则可列方程为( )A .()95199x +=B .()95199x -=C .()295199x +=D .()295199x -=8.如图,ABC △三边的中点分别是D ,E ,F ,则下列说法正确的是( )①四边形ADEF 一定是平行四边形;②若90A ∠=︒,则四边形ADEF 是矩形;③若AE BC ⊥,则四边形ADEF 是菱形:;④若AE 平分∠BAC ,则四边形ADEF 是正方形.A .①②④B .①②③C .②③④D .①③④二、填空题(共16分,每题2分)9.方程240x x -=的解为______.10.某一次函数的图象经过点()0,3-,且函数y 随x 的增大而增大,请你写出一个符合条件的函数表达式______.11.已知()111,P y -、()222,P y 是一次函数21y x =+的图象上的两点,则1y ______2y .(填“>”、“<”或“=”)12.菱形两条对角线长分别为6和8,则这个菱形的面积是______.13.如图,A ,B 两地被建筑物遮挡,为测量A ,B 两地间的距离,在地面上选一点C ,连结CA ,CB ,分别取CA ,CB 的中点D ,E ,若DE 的长为36m ,则A ,B 两地间的距离为______m .14.如图,矩形ABCD 中,对角线AC 、BD 交于点O ,如果80AOB ∠=︒,那么∠ADB 的度数为______.15.某学校有一个矩形小花园,花园长20米,宽18米,现要在花园中修建人行通道,如图所示,阴影部分为通道,其余部分种植花卉,同样宽度的通道有3条,其中两条与矩形的宽平行,另外一条与矩形的宽垂直,计划花卉种植面积共为306平方米,设通道的宽为x 米,根据题意可列方程为______.16.在平面直角坐标系xOy 中,已知()3,0A -,()2,0B ,()1,3C ,若以A ,B ,C ,D 为顶点的四边形是平行四边形,则点D 的坐标是______.三、解答题(本题共68分,17-22题每小题5分,23-26题每小题6分,27、28题每小题7分)17.解方程:2450x x --=.18.如图,在平行四边形ABCD 中,E ,F 分别是BC ,AD 上的点,且AE CF ∥.求证:BE DF =.19.已知一个一次函数的图象平行于直线12y x =,且经过点()2,3A ,与x 轴交于点B .(1)求这个一次函数的表达式,并在平面直角坐标系中画出它的图象;(2)求AOB △的面积.20.已知关于x 的一元二次方程210x mx m ++-=.(1)求证:方程总有两个实数根;(2)如果方程有一个根为正数,求m 的取值范围.21.如图,ABCD 的对角线AC 与BD 相交于点O ,将对角线BD 向两个方向延长,分别至点E 和点F ,且BE DF =.(1)求证:四边形AECF 是平行四边形;(2)若AEF CEF ∠=∠,求证:四边形AECF 是菱形.22.阅读以下材料,并按要求完成相应的任务:三角形中位线定理的证明如图1,ABC △中,点D ,E 分别是AB ,AC 的中点,连接DE ,像DE 这样,连接三角形两边的中点的线段叫做三角形的中位线.求证:DE BC ∥,且12DE BC =.证明:如图2,延长DE 到点F ,使EF DE =,连接FC ,DC ,AF .∵AE EC =,DE EF =,∴四边形ADCF 是平行四边形(依据1),∴CF DA ∥.∵DA DB =,∴CF BD ∥,∴四边形DBCF 是平行四边形(依据2),∴DF BC ∥.∵12DE DF =,∴DE BC ∥,且12DE BC =.任务(1)上述材料证明过程中的“依据1”是________;“依据2”是________;归纳总结上述证明过程中运用了“倍长线段法”,也有人称材料中的方法为“倍长法”(延长了三角形中位线的一倍),该方法是解决初中数学几何问题的一种常用方法.类比探究;某数学学习小组在研究中发现还可以用“倍长线段法”证明定理:直角三角形斜边的中线等于斜边的一半.已知:如图3,在Rt ACB △中,90ACB ∠=︒,E 为AB 边的中点,求证:12CE AB =.证明:延长CE 到点F ,使EF CE =,连接BF ,AF ,如图4.任务(2)请将证明过程补充完整.23.如图,用80m 长的篱笆在墙边(墙长40米)田一个矩形草坪,当矩形面积是750m 2时,它的长和宽应为多少?24.菲尔兹奖是国际上享有崇高声誉的一个数学奖项,每4年评选一次,颁给有卓越贡献并且年龄一般不超过40岁的2~4名年轻数学家,被视为数学界的诺贝尔奖.自1936年以来,每次都在国际数学家大会上颁发菲尔兹奖.华裔数学家丘成桐、陶哲轩分别在1982年、2006年获得菲尔兹奖.下面的数据是从1936年至2022年共64位菲尔兹奖得主获奖时的年龄(岁):29 39 35 33 39 27 33 35 31 31 37 32 38 36 31 39 32 38 3734 29 34 38 32 35 36 33 32 29 35 36 37 39 38 40 38 37 3938 34 33 40 36 36 37 40 31 38 38 40 40 37 35 40 39 37 3040 34 36 36 39 35 37数据经分组整理,列出了如下的频数分布表,并绘制了频数分布直方图:年龄x 岁频数2731x ≤<a 3135x ≤<163539x ≤<293943x ≤<b 合计64(1)截至2022年,最年轻的菲尔兹奖得主的年龄是______岁;(2)a =______,b =______;(3)补全频数分布直方图;(4)结合统计图表,请你描述这64位菲尔兹奖得主获奖时的年龄分布特征.25.在平而直角坐标系xOy 中,一次函数()0y kx b k =+≠的图象经过点()1,0,()2,2,(1)求这个一次函数的表达式;(2)当1x >-时,对于x 的每一个值,函数2y mx =+的值大于一次函数()0y kx b k =+≠的值,直接写出m 的取值范围.26.甲乙两人在一条长400米的直线跑道上同起点、同终点、同方向匀速跑步,先到终点的人原地休息,已知甲先出发3秒;在跑步过程中,甲、乙两人间的距离y (米)与乙出发的时间x (秒)之间的函数关系如图所示.①甲的速度为______米/秒,乙的速度为______米/秒;②离开起点后,甲、乙两人第一次相遇时,距离起点______米;③乙到达终点时,甲距离终点还有______米;④甲、乙两人之间的距离超过32米的时间范围是:______秒<x <______秒.27.正方形ABCD 中,点E 为射线DC 上一点(点E 不与D ,C 重合),射线AE 交BD 于点P ,交直线BC 于点F ,点Q 为EF 的中点,连接PC ,CQ .(1)如图1,当点E 在线段DC 上时,直接写出∠PCQ 的度数,PCQ ∠=______,并证明;(2)如图2,当点E 在线段DC 的延长线上时,过点D 作BD 的垂线,交直线CQ 于点M .①依题意补全图形;②用等式表示线段DP ,DC ,DM 的数量关系,并证明.28.对于点P 和图形W ,若点P 关于图形W 上任意的一点的对称点为点Q ,所有点Q 组成的图形为M ,则称图形M 为点P 关于图形W 的“对称图形”.在平面直角坐标系xOy 中,已知点A ( -1,-2), B (2,-2),C (2,1), D (-1,1).(1)①在点()2,4E --,()0,4F -,()3,3G -中,是点O 关于线段AB 的“对称图形”上的点有______;②画出点O 关于四边形ABCD 的“对称图形”;(2)点(),0T t 是x 轴上的一动点.①若点T 关于四边形ABCD 的“对称图形”与O 关于四边形ABCD 的“对称图形”有公共点,求t 的取值范围;②直线y x t =-与x 轴交于点T ,与y 轴交于点H ,线段TH 上存在点K ,使得点K 是点T 关于四边形ABCD 的“对称图形”上的点,直接写出t 的取值范围.参考答案一、选择题(本题共8道小题,每小题2分,共16分)题号12345678答案CDD A DB CB 二、填空题(本题共8道小题,每小题2分,共16分)题号910111213141516答案10x =,24x =3y x =-答案不唯一<247240°()()20218306x x --=()14,3D -()26,3D ()32,3D --三、解答题(本题共68分,第17-22题,每小题5分,第23-26题,每小题6分,第27、28题,每小题7分)17.解:2450x x --=()()510x x -+=15x =,21x =-.18.证明:∵四边形ABCD 是平行四边形,∴AD BC ∥,AD BC =.∵AE CF ∥,∴四边形AECF 是平行四边形.∴EC AF =.∴BC EC AD AF -=-,即:BE DF =.19.(1)解:∵一个一次函数的图象平行于直线12y x =,∴设这个一次函数的表达式为:12y x b =+.∵且经过点()2,3A ,∴1232b ⨯+=,∴2b =.∴这个一次函数的表达式为:122y x =+.画出一次函数图像(2)()4,0B -1143622AOB A S OB y =⋅⋅=⨯⨯=△.20.(1)证明:1a =,b m =,1c m =-,()()22224411442b ac m m m m m ∆=-=-⨯⨯-=-+=-∵()220m -≥,∴0∆≥.∴方程总有两个实数根.(2)解:()22m m x -±-=11x =-,21x m =-.∵方程有一个根为正数,∴10m ->,∴1m <.21.(1)解:∵四边形ABCD 是平行四边形,∴OA OC =,OB OD =.∵BE DF =,∴OB BE OD DF +=+,即:OE OF =.∴四边形AECF 是平行四边形.(2)证明:∵四边形AECF 是平行四边形,∴FC AE ∥.∴CFE AEF ∠=∠.∵AEF CEF ∠=∠,∴CFE CEF ∠=∠,∴CF CE =.∴平行四边形行AECF 是菱形.22.解:任务(1)上述材料证明过程中的“依据1”是对角线互相平分的四边形是平行四边形;“依据2”是一组对边平行且相等的四边形是平行四边形;任务(2)证明:∵E 为AB 边的中点,∴AE BE =.∵EF CE =,∴四边形ACBF 是平行四边形.∵90ACB ∠=︒,∴四边形ACBF 是矩形.∴12CE AB =.23.解:设矩形的宽AB 为x 米,那么长BC 为()802x -米.据题意,可得方程整理,得:()802750x x -=.整理,得:2403750x x -+=.125x =,215x =.125x =时,80230x -=;115x =时,80250x -=∵墙长40米,∴215x =不符合题意舍去∵25AB =,30BC =答:矩形草坪的宽AB 为25米,长BC 为30米.24.(1)27;(2)5a =,14b =;(3)(4)35至39岁的人获得菲尔兹奖的人数最多.(答案不唯一)25.(1)解:∵一次函数的图象经过点()1,0和点()2,2B ,∴022k b k b=+⎧⎨=+⎩,解得:22k b =⎧⎨=-⎩∴一次函数的表达式为22y x =-.(2)26m ≤≤.26.①甲的速度为4米/秒,乙的速度为5米/秒:②离开起点后,甲、乙两人第一次相遇时,距离起点60米;③乙到达终点时,甲距离终点还有68米;④甲、乙两人之间的距离超过32米的时间范围是44秒<x <89秒.27.(1)90PCQ ∠=︒,(1)证明:∵四边形ABCD 是正方形∴AB BC =① 45ABD DBC ∠=∠=︒②90BCD DCF ∠=∠=︒,AB DC∥∵BP BP =③∴由①②③ABP CBP ≌△△(SAS )∴34∠=∠∵90DCF ∠=︒ 点Q 是EF 中点∴EQ CQ QF==∴12∠=∠∵AB DC ∥ ∴31∠=∠∴2431∠=∠=∠=∠∵490PCD ∠+∠=︒∴290PCD ∠+∠=︒∴90PCQ ∠=︒(2)①依题意补全图形;②证明:同理可证90PCQ ∠=︒∴790PCM PCD ∠=∠+∠=︒∵890PCD ∠+∠=︒∴87∠=∠④∵四边形ABCD 是正方形∴BC DC =⑤,645BDC ∠=∠=︒∵BD DM ⊥,∴6545∠=∠=︒⑥由④⑤⑥可得:BPC DMC ≌△△(ASA )∴DM BP=∵90DCB ∠=︒,645∠=︒∴BD =∴BP DP +=∴DM DP +=28.(1)点E ,点F①点O 关于四边形ABCD 的“对称图形”为四边形NMIJ ,如图动点T 关于四边形ABCD 的“对称图形”为四边形SRVU ,如图当边SR 与IJ 重合时,6t =当边UV 与MN 重合时,6t =-∴66t -≤≤②24t ≤≤或21t -≤≤-。
常见症状
常见症状[单项选择题]1、咳嗽与咳痰中,下列哪项是错误的()A.咳嗽是一种保护性反射动作B.咳嗽亦属一种病理现象C.咳嗽控制中枢在延髓D.咳痰是一种病态现象E.胸膜疾病或心血管疾病不会出现咳嗽。
参考答案:E[单项选择题]2、体温恒定的维持在39~40℃或以上,达数天或数周,24h内体温波动范围不超过1℃的是()A.波状热B.稽留热C.不规则热D.弛张热E.间歇热参考答案:B[单项选择题]3、下列哪项不属于疼痛的性质()A.刺痛B.刀割样痛C.烧灼痛D.绞痛E.牵涉痛参考答案:E[单项选择题]4、呕吐伴眩晕、眼球震颤可见于()A.脑震荡B.脑溢血C.脑梗塞D.前庭器官疾病E.眼病参考答案:D[单项选择题]5、心悸伴晕厥或抽搐最常见于()A.I度窦房传导阻滞B.心室颤动或阵发性室性心动过速、病态窦房结综合征。
C.甲状腺功能亢进D.心脏神经官能症E.急性失血参考答案:B[单项选择题]6、呕血是指()A.屈氏韧带以上的消化器官B.幽门以上的器官C.十二指肠以上的消化器官D.小肠以上的消化器官E.结肠以上的消化器官参考答案:A[单项选择题]7、关于呕血,下列哪项不正确()A.病因最多见于消化性溃疡B.出血方式为呕出C.血中混有食物残渣、胃液D.酸碱反应为碱性E.出血前有上腹部不适、恶心、呕吐参考答案:D[单项选择题]8、下列哪些不是引起便血的小肠疾病?()A.小肠血管畸型B.肠套叠C.空肠溃疡D.回肠溃疡E.阿米巴痢疾参考答案:E[单项选择题]9、呕血的颜色()A.出血量大时咖啡色B.出血速度快时咖啡色C.出血量大出血速度快时鲜红D.出血量小时鲜红E.出血速度慢时鲜红参考答案:C[单项选择题]10、消化性溃疡()A.上腹痛B.剑下痛C.脐周痛D.上腹部节律性,周期性痛E.下腹痛参考答案:D[单项选择题]11、上腹进行性疼痛伴黄疸可见于()A.消化性溃疡B.慢性胃炎C.胆囊炎D.胰腺炎E.胰腺癌参考答案:E[单项选择题]12、有关腹泻的叙述,哪项是不正确的()A.变态反应可引起腹泻B.腹泻的某些发病因素互为因果C.病程超过两个月者属于慢性腹泻D.分泌性腹泻是由于胃肠粘膜分泌过多的液体所致E.渗出性腹泻粘膜组织学基本正常参考答案:E[单项选择题]13、属于典型分泌性腹泻的是下列哪项()A.服用硫酸镁B.甲状腺功能亢进C.霍乱D.溃疡性结肠炎E.吸收不良综合征参考答案:C[单项选择题]14、腹泻伴皮疹或皮下出血可见于()A.Crohn病B.败血症C.霍乱D.溃疡性结肠炎E.细菌性痢疾参考答案:B[单项选择题]15、下列那种疾病可引起肝细胞性疾病黄疸()A.蚕豆病B.原发性胆汁性肝硬化C.毛细胆管型炎病毒性肝炎D.胆总管结石E.中毒性肝炎参考答案:E[单项选择题]16、Charcot三联征常常提示()A.肝脓肿B.急性化脓性胆管炎C.胆道蛔虫病D.原发性肝癌E.钩端螺旋体病参考答案:B[单项选择题]17、下述药物哪种易出现溶血性黄疸()A.氯丙嗪B.卡铂C.伯氨喹啉D.甲基睾丸酮E.甲基硫氧嘧啶参考答案:C[单项选择题]18、男,30岁,近4年来经常间发四肢关节疼痛,近来感乏力、纳差、心悸、气促,肝在肋下2.5cm触及,轻触痛。
- 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)。
初二下部分参考答案(5)
练习39((返回目录)
1. 先△ABE ≌△BCF ≌△CAD ,
2.三次全等,
3.证△PQM ≌△PRN
4.△ABC ≌△DBE ,∠BAC + ∠DAF =∠BDE +∠DEF =60 +180
1. 取CD 的中点M ,连结ME ,MF 6. △EAM ≌△ABH
5. 作△ABD 的高DF ,证△BDF ≌△BAC
6. 作斜边上高,找全等三角形
7. 求出∠DBC =30 ,有两种图形
8. 延长BC 到N ,使CN =AB ,延长CB 到M ,使BM =AC , 证△AMD ≌△AND ,△CAN ≌△MBA
9. 延长BE 到F ,使EF =BC
10. 延长CB 到G 使BG =DF
13. 证明
CD
NF CD ME 14.∠CDF =∠F =∠BDF =∠DHC =22.5 练习40((返回目录)
1. 以AD 轴作轴对称三角形
2. 取AB 中点N ,再证明DN =DM
3. 利用外角性质,分别用两角差表示∠A 和∠E
4. 有多种证明方法,注意三角形中位线性质
6. ∠B +(∠BAE -∠DAE )=90, ∠C +(∠EAC +∠DAE )=90
7. ∠ABC = ∠ACB =∠D +∠CBD ,两边同加上∠CBD 10 .作高AH
12 延长GE 交AC 于M ,则E 是GM 的中点,作EP ∥BC 交AC 于P ,则EP 被AD 平分
11. 在BC 上取BE =BD ,则△EDC 等腰,作DF ∥BC 交AB 于F ,可证△ECD ≌△ADF
16. 在BF 上截取BG =FC ,△BGE ≌△CFA ,再证GE =GF。