专项练习题
专项训练小学语法练习题及详解
专项训练小学语法练习题及详解一、单项选择题1. — Can you tell me ___________ the library?— Sure. It's next to the bank.A. when isB. where isC. what isD. how is答案:B解析:这是一个问句,询问图书馆的位置,因此答案应该选择表示地点的疑问词,故选B。
2. — ________ does your brother go to work?— By bike.A. HowB. WhenC. WhereD. What答案:A解析:这是一个问句,询问兄弟是用什么方式去上班,答案应选择表示方式的疑问词,故选A。
3. — I don't like ice cream. ________, it's too sweet for me.— I see. You can try yogurt instead.A. AndB. ButC. SoD. Or答案:B解析:根据句意,第一空后应填入表示转折关系的词,故选B。
4. — _________ do you go swimming in summer?— Twice a week.A. How longB. How oftenC. How farD. How much答案:B解析:根据句意,问句询问的是每周游泳的频率,故选B。
5. — ________ does your father usually watch TV?— In the evening.A. WhenB. HowC. WhyD. Where答案:A解析:问句询问的是父亲通常什么时候看电视,故选A。
二、完形填空题Dear students,I'm writing to remind you of an important event happening this Friday—our school's annual talent show! This is a great opportunity for __1__ to showcase your amazing __2__. It doesn't matter if you can sing, dance, play instruments, or do magic tricks. Everyone has a unique talent, __3__ this is the perfect chance to share it with our school community.If you would like to participate, __4__ fill out the registration form attached to this letter and hand it to your class __5__ by Wednesday. Each act should not exceed five minutes. Remember to __6__ your own props and costumes.The talent show will be held in the school auditorium, starting at 7:00 p.m. sharp. __7__ parents, teachers, and students are invited to attend. It's going to be a wonderful evening full of performances and __8__. We can't wait to see what you all have __9__ for us.Please note that the talent show is not a competition, __10__ an opportunity for us to appreciate and celebrate the diverse talents within our school.Thank you for your attention. We look forward to your participation!Best regards,Principal Taylor1. A. usB. themC. youD. me答案:C解析:根据上下文,提到了学生的才艺,因此first blank应填代词“you”。
高三数学专项训练:排列与组合练习题
高三数学专项训练:排列与组合练习题一、选择题1.将3个不同的小球放入4个盒子中,则不同放法种数有()A.81 B.64 C.14 D.122.用0到9这10个数字,可以组成没有重复数字的三位偶数的个数为( )A.324B.328C. 360D.6483.A,B,C,D,E五人并排站成一排,如果A,B必须相邻且B在A的左边,那么不同的排法共有()A.60种 B.48种 C.36种 D.24种4.3位男生和3位女生共6位同学站成一排,若男生甲不站两端,3位女生中有且只有两位女生相邻,则不同的排法的种数是()A.360 B.288 C.216 D.965.将2名教师,4名学生分成2个小组,分别安排到甲、乙两地参加社会实践活动,每个小组由1名教师和2名学生组成,不同的安排方案共有( )A.12种 B.10种 C.9种 D.8种6.现有高一年级的学生3名,高二年级的学生5名,高三年级的学生4名,从中任选1人参加某项活动,则不同选法种数为()(A)60 (B)12 (C)5 (D)57.从10名大学生中选3个人担任乡村干部,则甲、丙至少有1人入选,而乙没有入选的不同选法的种数为()A. 85 B. 56 C. 49 D. 288.某公司新招聘8名员工,平均分配给下属的甲、乙两个部门,其中两名英语翻译人员不能分在同一部门,另外三名电脑编程人员也不能全分在同一部门,则不同的分配方案共有()A. 24种B. 36种C. 38种D. 108种9.某台小型晚会由6个节目组成,演出顺序有如下要求:节目甲必须排在第四位、节目乙不能排在第一位,节目丙不能排在最后一位,该台晚会节目演出顺序的编排方案共有(A)36种(B)42种(C)48种(D)54种10.有6人被邀请参加一项活动,必然有人去,去几人自行决定,共有()种不同去法A. 36种B. 35种C. 63种D. 64种11.甲、乙两人从4门课程中各选修2门,则甲、乙所选的课程中至少有1门不相同的选法共有()A. 6种B. 12种C. 30种D. 36种12.从6名同学中选派4人分别参加数学、物理、化学、生物四科知识竞赛,若其中甲、乙两名同学不能参加生物竞赛,则选派方案共有()A.240种 B.280种 C. 96种 D.180种13.2位教师与5位学生排成一排,要求2位教师相邻但不排在两端,不同的排法共有()A. 480种B.720种C. 960种D.1440种14.4名运动员报名参加3个项目的比赛,每人限报一项,不同的报名方法有(A)43种(B)34种(C)34A种(D)34C种15.从9名学生中选出4人参加辩论赛,其中甲、乙、丙三人至少有两人入选的不同选法的种数为()A.36 B.51 C.63 D.9616.今有甲乙丙三项任务,甲需2人承担,乙丙各需1人承担,现从10人中选派4人承担这三项任务,不同的选派方法有A.1260种B.2025种C.2520种D.5054种17.某外商计划在4个候选城市中投资3个不同的项目,且在同一个城市投资的项目不超过2个,则该外商不同的投资方案有 ( )A.16种 B.36种 C.42种 D.60种18.从4名男生和3名女生中选出4人参加某个座谈会,若这4人中必须既有男生又有女生,则不同的选法共有 ( )A.140种 B. 120种 C. 35种 D. 34种19.有5个不同的小球,装入4个不同的盒内,每盒至少装一个球,共有()不同的装法.A.240 B.120 C.600 D.36020.有11名学生,其中女生3名,男生8名,从中选出5名学生组成代表队,要求至少有1名女生参加,则不同的选派方法种数是 ( )A.406B.560C.462D.15421.有编号分别为1,2,3,4,5的5个红球和5个黑球,从中取出4个,则取出的编号互不相同的种数为()A.5 B.80 C.105 D.21022.从10名大学毕业生中选3人担任村长助理,则甲、乙至少有1人入选,而丙没有入选的不同选法的种数为A.85B.56 C.49 D.2823.某班乒乓球队9名队员中有2名是校队选手,现在挑5名队员参赛,校队必须选,那么不同的选法共有()种.A)126;B)84;C)35;D)21;24.三名教师教六个班的课,每人教两个班,分配方案共有()A.18种B.24种C.45种D.90种25.某班级有一个8人小组,现任选其中3人相互调整座位,其余5人座位不变,则不同的调整方案的种数有()A.56B.112C.336D.16826.甲、乙、丙3位同学选修课程,从4门课程中,甲选修2门,乙、丙各选修3门,则不同的选修方案共有()A.36种B.48种C.96种D.192种27.平面上有5个点,其中任何3个点都不共线,那么可以连成的三角形的个数是( ) A.3 B.5 C.10 D.2028.6本不同的书分给甲、乙、丙三人,每人两本,不同的分法种数是()A.2264C C B C.336A D.36C29.某班级要从4名男士、2名女生中选派4人参加某次社区服务,如果要求至少有1名女生,那么不同的选派方案种数为( )A.14B.24C.28D.4830.有5盆互不相同的玫瑰花,其中黄玫瑰2盆、白玫瑰2盆、红玫瑰1盆,现把它们摆放成一排,要求2盆白玫瑰不能相邻,则这5盆玫瑰花的不同摆放种数是()A、120 B、72 C、12 D、3631.从6人中选4人分别到北京、哈尔滨、广州、成都四个城市游览,要求每个城市有一人游览,每人只游览一个城市,且在这6人中甲、乙不去哈尔滨游览,则不同的选择方案共有A.300种B.240种C.144种D.96种32.将4个不同的球放入3个不同的盒中,每个盒内至少有1个球,则不同的放法种数为()(A)24 (B)36 (C)48 (D)9633.现安排5名同学去参加3个运动项目,要求甲、乙两同学不能参加同一个项目,每个项目都有人参加,每人只参加一个项目,则满足上述要求的不同安排方案个数为()(A)72 (B)114 (C)144(D)150 34.某人有3个不同的电子邮箱,他要发5个电子邮件,发送的方法的种数()A . 8 B. 15 C. 243 D. 12535.7名志愿者安排6人在周六,周日两天参加社区公益活动若每天安排3人,则不同的安排方案共有()A.280种B.140种C.360种D.300种36.某班级要从4名男生、2名女生中选4人接受心理调查,如果要求至少有1名女生,那么不同的选法种数为()A.14 B.24 C.28 D.4837.某节目表有6个节目,若保持其相对顺序不变,在它们之间再插入2个小品节目,且这2个小品在表中既不排头也不排尾,那么不同插入方法有()A. 20种B. 30种C. 42种D. 56种38.现从甲、乙、丙等6名学生中安排4人参加4×100m接力赛跑。
汉语词汇运用专项练习题
汉语词汇运用专项练习题本练题共包括四部分:听力、阅读、写作和口语。
以下是每个部分的说明和练题目:听力说明此部分包括两段对话,每段对话听两遍。
请听完对话后,根据听到的内容选择正确答案。
练题1. 你听到了什么?A. 冬天很冷。
B. 今天天气很好。
C. 我们去打篮球吧。
2. 你听到了什么?A. 爸爸明天出差。
B. 妈妈今天去买菜了。
C. 我们下个月去旅游。
阅读说明此部分包括一篇短文和五个问题。
请仔细阅读短文后,根据内容选择正确答案。
练题中秋节是一个很重要的中国传统节日。
人们通常在这一天吃月饼、赏月和欣赏中秋灯笼。
一些地方还会举行拜月祭祖等传统活动。
1. 中秋节是哪个国家的传统节日?A. 日本。
B. 中国。
C. 美国。
2. 在中秋节人们通常会做什么?A. 穿新衣服。
B. 看电影。
C. 吃月饼和赏月。
3. 中秋节有哪些传统活动?A. 捞月。
B. 拜月祭祖。
C. 都有。
写作说明此部分要求根据题目中给出的要点写一篇作文,词数80-100。
练题请根据以下要点写一篇短文:你最喜欢的一本书。
1. 书的名字。
2. 你为什么喜欢它。
3. 你从这本书中得到了什么。
口语说明此部分包括两个问题和一篇短文。
请回答问题并完成短文朗读。
练题1. 你最喜欢的饮料是什么?2. 请朗读以下短文,要求流利、准确。
山东省是中国东部的一个省份,有着悠久的历史和灿烂的文化。
这里的旅游资源非常丰富,著名的景点有泰山、威海等等。
一年级数学解决问题专项练习30题(含答案)
一年级数学解决问题练习题1、小明折了9只纸飞机,比小军少折3只,小军折了几只纸飞机?2、池塘的荷叶上有6只青蛙,跳来了3只,又跳走了4只。
池塘里还有几只青蛙?3、小丁丁做口算题对了21道,错了14道。
他一共做了几道口算题?4、篮子里有10个苹果,被小丁丁吃掉1个,又被爸爸吃掉2个。
现在还有多少个?5、妈妈买来10个苹果,小丁丁和爸爸各吃了2个。
现在还有多少个?6、小红有16本故事书,比小芳多3本,比小明少两本。
小芳和小明各有多少本故事书?7、湖中有8只天鹅,飞走了2只,又飞来了6只,湖中还有几只天鹅?8、盒子里有一些月饼,爸爸、妈妈各吃了1个,小明吃了2个,还剩5个。
盒子里原来有几个月饼?9、商店里有20瓶汽水,上午卖掉了9瓶,下午卖掉的和上午一样多,一共卖掉几瓶?还剩几瓶?10、小丽有10支铅笔,小云有16支铅笔。
小云送给小丽几支后,两人的铅笔同样多?11.教室里有男生8人,女生10人,一共有几人?教室里有18人,走了5人,还剩几人?12.一根绳子对折后长7米,这根绳子原来长多少米?这根绳子用掉6米后,还剩几米?13.小明看一本故事书,第一天看了6页,第二天看了10页,第三天从第几页看起?14.小丽排队做操,从前面数起他是第5个,从后面数起他也是第5个,这一排一共有多少个学生?15.军军从一楼走到二楼需要1分钟,用这样的速度他从一楼走到五楼,再从五楼回到一楼共需要多少分钟?16.明明从家走到学校要走6千米,这一天他走到一半,返回家拿作业本,又立即赶回学校,这一天他从家到学校一共走了多少米?17. 车上原有20人,到站下车8人,上车5人,这时车上有多少人?18.原来有18个苹果,红红吃了一些,还剩下9个,小红吃了几个苹果?19.猫妈妈钓来一些鱼,小花猫吃了一条,把剩下的一半分给了小白猫,小花猫又吃了1条,再把剩下的一半分给了小黑猫,这时,小花猫还有4条鱼,你能算出猫妈妈一共掉了多少条鱼吗?20.小军吃了5个苹果,还剩下3个,小军原来有多少个苹果?21.小熊已经走了35米,离学校还有55米,小熊家到学校有多少米?22.8个同学回家了,班里还剩12个同学,请问原来有几个同学?23.小红做了46面小红旗,送给幼儿园小朋友一些后,还剩20面,送走了多少面小红旗?24.爸爸今年36岁,我比爸爸小28岁,我今年几岁?25.一本书,小明看了38页,还剩25页,这本书一共多少页?26.同学们要做40个灯笼,已经做好了26个,还得做多少个?27.图书室里有有10个女同学,有8个男同学,女同学比男同学多多少个?28.小明上午算了8道数学题,下午算了12道数学题,上午比下午少算几道数学题?29.妈妈买了红色扣子8个,白色扣子6个,绿色扣子3个,问:(1)红色扣子比白色扣子多多少个?(2)绿色扣子比白色扣子少多少外个?30.小华做了14个信封,比小亮做多了6个信封,小亮做了多少个信封?参考答案1. 122. 53. 354. 75. 66. 13 187. 128. 99. 18 210. 311. 18 1312. 14 813. 1714. 915. 816. 917. 1718. 919. 1920. 821.9022.2023.2624.825.6326.1427.228.429.2、3 30.8数学练习题汇总1. 58个珠子,10个穿一串,能穿几串?2. 80块饼干,10块装一袋,可以装满几袋?3. 5个红苹果装一袋,装了8袋。
《整式的加减》专项练习100题(有答案)
《整式的加减》专项练习100题(有答案)哎,说起《整式的加减》,这可是我们数学学习中的基本功啊!今天,我就来给大家分享一组我精心准备的专项练习题,一共100题,每题都有答案哦!准备好了吗?咱们开始吧!首先,咱们来点简单的,比如这样一道题:1. 3a + 2b 4a + b = ?哎呀,这个题很简单,先把同类项放一起,3a和4a,2b和b,然后相加减,不就出来了嘛!答案是a + 3b。
再来一道稍微有点挑战性的:2. 5x^2 3x + 2 2x^2 + 4x 1 = ?这个题,咱们先把同类项合并,5x^2和2x^2是同类项,3x和4x也是同类项,常数项2和1也是同类项。
合并后,5x^2 2x^2等于3x^2,3x + 4x等于7x,2 1等于1。
所以答案是3x^2 + 7x + 1。
好啦,接下来咱们来点更有趣的:3. 如果a = 2,b = 3,那么2a^2 + 3b^2 a b等于多少?这个题,咱们先把a和b的值代入进去,2 * 2^2 + 3 * 3^2 2 3。
计算一下,4 * 2 + 9 * 3 2 3等于8 + 27 5,答案是30。
哎呀,做数学题真是件开心的事情,尤其是当你看到那些复杂的式子在你手里变得简单时,心里那个美啊!现在,让我们来点更有挑战性的:4. (x + y)(x y) + 2xy = ?这个题,我们要用到平方差公式,x^2 y^2 + 2xy。
然后,我们可以把它写成(x + y)^2的形式。
所以答案是(x + y)^2。
好啦,做到这里,我已经有点累了,但是我知道你们肯定还意犹未尽。
那么,接下来的题目,就交给大家自己挑战吧!5. 4m^2n 3mn^2 + 2mn n^3 = ?6. (2x 3y)^2 (x + 2y)^2 = ?7. 5a^2b 3ab^2 + 2ab b^3 = ?8. (x + 2)(x 3)(x + 1) = ?这些题目,都是我精心挑选的,既有基础的加减法,也有乘法、平方差的应用,还有代数式的化简。
专项练习练习题
一、选择题1. 下列哪个选项是计算机硬件?A. 操作系统B. 硬盘C. 软件程序D. 计算机病毒A. HTMLB. CSSC. JavaScript3. 下列哪个是计算机软件?A. 硬件B. 系统软件C. 应用软件A. TCP/IPB. HTTPC. FTPA. 传染性B. 隐蔽性C. 破坏性二、填空题1. 计算机硬件包括:________、________、________、________等。
2. 编程语言包括:________、________、________、________等。
3. 计算机软件包括:________、________、________、________等。
4. 网络协议包括:________、________、________、________等。
5. 计算机病毒的特点有:________、________、________、________等。
三、判断题1. 计算机硬件包括:CPU、内存、硬盘、显示器等。
()2. 编程语言包括:HTML、CSS、JavaScript、Python等。
()3. 计算机软件包括:操作系统、办公软件、游戏软件、杀毒软件等。
()4. 网络协议包括:TCP/IP、HTTP、FTP、SMTP等。
()5. 计算机病毒的特点有:传染性、隐蔽性、破坏性、可复制性等。
()四、简答题1. 简述计算机硬件的组成。
2. 简述编程语言的作用。
3. 简述计算机软件的分类。
4. 简述网络协议的作用。
5. 简述计算机病毒的特点及其危害。
五、操作题1. 使用Python编写一个程序,计算1到100之间所有偶数的和。
2. 编写一个HTML页面,包含一个、一段文本和一个。
4. 创建一个简单的JavaScript函数,用于计算两个数的乘积。
5. 使用SQL查询数据库,检索特定条件下的所有记录。
六、编程题1. 编写一个C++程序,实现冒泡排序算法。
2. 使用Java编写一个类,包含一个方法用于计算圆的面积。
非谓语动词专项练习100题(含答案)
非谓语动词专项练习100题(含答案)1.The great hall was crowded with many people, __many children __on their parents’ laps.A.including; seated B.including; seating C.included; sat D.included; sitting 2.It’s said that the Olympic Games __ in Beijing in 2008 will cover more events than any other Olympics did. A.holding B.to be held C.held D.to be holding 3.____for a long time, most of the crops in this area died from lacking water. A.Being no rain B.There was no rain C.To be no rain D.There being no rain 4.A street-beggar bought a lottery ticket purposelessly,__him a millionaire overnight. A.making B.makes C.to make D.made 5.In the face of the big fire in October in California, many people in the fire-stricken areas moved out _____. A.to escape burning B.to escape being burned C.escaping burned D.escaping from burning 6.Taking this medicine, if _____, will of course do good to his health. A.continued B.to continue C.continues D.continuing 7.The little boy still needs the _____20 dollars to do with some things _____. A.remaining; remained to be settled B.remaining; remaining to be settled C.remained; remained to settle D.remained; remaining to settle 8._____ his age, the little boy read quite well. A.Considering B.Considered C.Consider D.Having considered 9.___from the appearance,it is very peaceful;but in fact,a war will break out soon. A.Judged B.Judging C.Having judged D .To judge D.To judge 10. —Tom enjoys ___ basketball on Sunday afternoons, doesn’t he?— Yes, he does. But what his sister enjoys _____. A.to play; dancing B.playing; to dance C.to play; to dance D.playing; is to dance 11.His letter, _____ to the wrong number, reached me late. A.having been addressed B.to have addressed C.to have been addressed D.being addressed 12. The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1, 2003, _____ all sev astronauts aboard. A.having killed B.killing C.being killed D.killed 13. There are lots of places of interest _____ in our city. A.needs repairing B.needing repaired C.needed repairing D.needing to be repaired 14. — What caused the party to be put off? What caused the party to be put off? —— _____ the invitations. A.Tom delayed sending B.Tom’s delaying sendingC.Tom delaying to send D.Tom delayed to send 15. I was afraid _____ to my customers because I was afraid _____ them. A.of talking back; to lose B.of talking back; of losing C.to talk back; to lose D.to talk back; of losing 16.Standing on the top of the hill, I would not do anything but _____ the flowing of the smog around me. A.enjoy B.enjoying C.enjoyed D.to enjoy 17.17.—— Is Tom a good talker? — No, he never speaks to me other than _____ something? A.ask for B.to ask for C.asked for D.asking for 18.I can’t get my car __ on cold mornings, so I have to try __ the radiator with some hot water.A.run; to fill B.running; filling C.running; to fill D.ran; filling 19.The drunken husband knocked against the table and sent the bowls _____ in all directions before he was sent _____ by h wife. A. flying; to sleep B. flying; sleeping C. to fly; to sleeping D. to fly; to sleep 20. When we got back from the cinema,we found the lamp ___but the door ___. A. being on; shut A. being on; shut B. burning; shutting B. burning; shutting B. burning; shutting C. burning; shut C. burning; shut D. on; shutting 21.We found the students seated at tables and had their eyes ____on the scene of the launch of Shenzhou V spaceship. A. fixed B. fix C. fixing D. to fix 22.A doctor can expect _____ at any hour of the day or night. A. calling B. to call C. being called D. to be called 23.The boy often gives a satisfactory answer to the teacher’s question, ____ just a minute. So he’s usually the teacher’s pet. A. thought B. having thought C. and to think D. thinking 24.The policeman came up to the lonely house with the door ____, ___there for a while and then entered it. A. open; to stand B. opening; stood C. open; stood D. opened; standing 25._____ along the quiet road at forty miles an hour, and then an old man suddenly started to cross the road in front of me. A. Driving B. I was driving C. Having driven D. When I was driving 26.Mr. Smith was much surprised to find the watch he had had ___was nowhere to be seen. A. repairing B. it repaired C. repaired D. to be repaired 27.What did the librarian _____ out of the library? A. permit to take B. forbid to be taken C. allow to take D. insist being taken 28. — Mum, why do you give me so much popcorn? — _____ the boring time. A. Kill B. Killing C. To kill D. Having killed 29.What Yang wanted to do when he got out of the spaceship was __the joy with all the Chinese. A. share B. shared C. having shared D. about to share 30.When she was alone at home, Mary needed a friend _____. A.playing with B.having played with C.with whom to play with D.with whom to play 31._____ the big snake, the little girl stood under the tree _____ out of life. A.Seeing; frightened B.Seeing; frightening C.Seen; frightened D.To see; frightening D.To see; frightening 32.The competitor never dreamed of __ for him to win the first prize in the 100-meter race. A.there was a chance B.there being a chance C.it being a chance D.it was a chance 33._____ everything to go wrong in advance, and you won’t feel quite so bad when it doe s. A. Having expected B. Expect C. To expect D. Expecting 34.34.—— You _____ part in the party on time. — Sorry, I was delayed by the accident. A.are to take B.have supposed to take C.were to have taken D.supposed to take 35._____ with the size of the whole earth, the highest mountain doesn’t seem high at all.A. When compared B.To compare C. While comparing D. It compared 36._____ in her best suit, the girl tried to make herself _____ at the party. A.Dressed; noticed B.Dressing; noticing C.Dressed; noticing D .Dressing; noticed D.Dressing; noticed 37.The matter _____ your study surely requires _____ carefully. A. relating to; dealing with B. related to; dealt with C. related to; being dealt with D. relating to; having dealt with 38._____ made her parents worried a lot. A. Her not to come back B. Not her to come back C. Her not coming back D. Not her coming back 39.Everything ___into consideration, they believed themselves more and returned to their positions. A.to take B.taken C.to be taken D.taking 40.He moved away from his parents and missed them ____enjoy the exciting life in New York. A. much so as to B. very much to C. too much to D. enough to 41.41.—— What do you think of the plan? — It’s easier said than _____. than _____. A. carried out B. carrying out C. carry out D. to carry out 42.Many businessmen attended the Boao Forum because they knew what __ from the forum. A. to get B. to be got C. got D. getting 43.There was a famous person at the party whom everyone would like _____to themselves. A. to introduce B. to be introduced C. introducing D. being introduced 44.44.—— Were you at home last Sunday? — Yeah! I devoted the whole day to _____ the English grammar. A. review B. reviewing C. be reviewed D. being reviewed 45.Once _____ at the shop, you will be dismissed immediately. A. caught stealing B. caught to steal C. catching stealing D. to catch to steal 46. Prices of daily goods____through a computer can be lower than store prices. A. are bought B. bought C. been bought D. buying 47._____, John returned to school from his hometown. A. The summer vacation being over B. The summer vacation is over C. Because the summer vacation over D. After the summer vacation being over 48._____ she can’t come, who will do the work?A. Supposed B. Supposing C. Having supposed D. Being supposed 49.49.—— Is there anything you want from town? — No, thank you. But I would like to get ___. A.those letters mailed B.mailed letters B.mailed letters C.to mail those letters D.those letters mail 50.After the guests left, she spent as much time as she could _____ the rooms. A. tidy up B. to clear away C. clear away D. tidying up 51._____ it or not, his discovery has shocked everyone in scientific circles. A. Believe B. To believe C. Believing D. Believed 52.To tell you the truth, I’d rather read than watch television; the programs seem __all the time.A.to get worse B.to be getting worse C.to have got worse D.getting worse 53.After the Arab states won independence, great em phasis was laid on education, with girls as well as boys _____ to go to school. A. to be encouraged B. encouraging C. encouraged D. be encouraged 54.Everyone had an application form in his hand, but no one knew which office _____. A. to send it to B. to send it C. to be sent to D. to have it sent 55.___that it was going to snow, the climbers decided to put off their attempt on the highest mountain. A. Having told B. Having been told C. Tell D. Telling 56.As is known to us all, traveling is __, but we often feel __ when we are back from travels. A.interesting; tired B.interested; tiring C.interesting; tiring D.interested; tired 57.The foreign tourists have visited many scenic spots in Shanghai,____as interpreter. A. the guide acts B. the guide acting C. acting D. acted 58.Linda is thought to___ in Africa, but I really don’t know what country she’s working in.A. have worked B. work C. be working D. be worked 59._____ 59._____ time time time and and and labor, labor, labor, cartoonists cartoonists cartoonists generally generally generally draw draw draw the the the hands hands hands of of of their characters their characters with with only only only 3 3 3 fingers fingers fingers and and and a a a thumb. thumb. A.To save B.Saved C.Saving D.Having saved 60.I am busy ____ for the entrance examination, so I can’t help ____housework at home.A.preparing; doing B.preparing; to do C.to prepare; doing D.to prepare; to do 61.In order to protect our planet, _____. A.all kinds of pollution should be reduced B.we should reduce all kinds of pollution C.the environment should be protected first D.it’s important to protect our environment62.Hoping he would not be seen, Bob stole in, ___his schoolbag and rushed out. A. picking up B. picked up C. to pick up D. having picked up 63.____money 63.____money if if if you you you can can can and and and many many many poor poor poor children children children in in in the the the poor poor poor mountainous mountainous mountainous areas areas areas will will will be be be able able able to to to go go go back back back to to to school. school. A.Having given B.Given C.To give D.Give 64.Whatever trouble Mr. White had ___with the case, he would stick to his own opinion. A.deal B.to deal C.dealt D.dealing 65.While listening to pop music, _____. A.she felt asleep B.the light went out C.someone knocked at the door D.and she couldn’t help laughing66.___ the distance was too long and the time was short, we decided not to drive to Florida. A. Discovering B. To discover C. To have discovered D. Discovered 67._____, J.K. Rowling is considered to be the best fiction writer A.Having sold millions of copies of her books B.Because millions of copies of her books are sold C.Sold millions of copies of her books D.Selling millions of copies of her books 68.What surprised me most was that there appeared a ____ look on her face on hearing the unexpected news. A.worrying B.worried C.worry D.worries 69._____ one of the most important inventions of the time, the computer helps people living in different countries to do a lot 69._____ one of the most important inventions of the time, the computer helps people living in different countries to do a lot things. A.Knowing to be B.It was known C.Known as D.Which was known to be 70.70.—— Did you enjoy yourself last night? — It’s very nice of you. I appreciated _____ to the party.A. to be invited B.to have invited C.being invited D.having been invited 71.If you go to the West Lake in Hangzhou, you will find it more attractive than commonly__. A. supposing B. to suppose C. supposed D. being supposed 72.72.—— Haven’t you seen the sign,_____ “NO PHOTOS”? — I’m really sorry I didn’tA. reads B. to read C. read D. reading 73.73.—— Do you feel like _____ out? — No. I’d rather we _____ a taxi.A. to drive; take B. to drive; took C. driving; take D. driving; took 74.74.—— Kate shouldn’t have done that sort of thing.— Whatever she did was reasonable, ____to what you had done. Besides, it’s none of your business. Get down to _____ you work. A. comparing; doing B. comparing; do C. compared; doing D. compared; do 75._____ nice and delicious, the fried chicken was soon sold out. A. Tasted B. Being tasted C. Tasting D. To taste 76.76.—The plan is heard ____ so well that we don’t have to make any changes. —The plan is heard ____ so well that we don’t have to make any changes. — It is indeed. A. to design B. designing C. designed D. design 77.W 77.While we’re developing agriculture and industry, we must prevent the earth___.hile we’re developing agriculture and industry, we must prevent the earth___. A. from polluting B. polluted C. polluting D. being polluted 78.The woman found it no good _____ her daughter too much money. A. giving B. being given C. given D. gave 79.He felt it a great honor _____ to visit me when I was in his city. A. to have been taken B. to have taken C. having taken D. being taken 80.Will you please tell me why you had no pen _____ in class, Kate? A.to have written B.to be written with C.to have been written D.to write with 81.Her dress has become loose. She appears _____ weight. A. to lose B. being lost C. losing D. to have lost 82.The building ____ will be completed in a month. It will be our lab building. A. to paint B. being painted C. to have painted D. painting 83.I find these problems are easy _____. A.to be worked out B.to work them out C.to work out D. to be worked them out 84.84.——What do you think of last night’s lecture? — _____ speaking, I thought it was rather boring. A. Real B. General C. Fair D. Honestly 85.Nancy let me repeat her instruction _____ sure that I understood what was _____ after she was away on business. A.to make; to be done B.making; doing C.to make; to do D.making; to do 86.The purpose of new drugs used on patients is to make them less painful, __ them more terrible. A.not make B.not to make C.not making D.do not make 87.As the stone was too heavy to move, I left it _____on the ground. A. laying B. lay C. lying D. lain 88.88.—— I would like to buy an expensive camera. — Well. We have several models __. A. to choose from B. of choice C. to be chosen D. for choosing st night I saw Yang Weiwei lying in bed, _____in deep thought. A. lost B. losing C. to lose D. being lost 90.Tigers _____ meat-eating animals _____ meat. A. belonged to; fed on B. belonging to; feed on C. were belonged to; feed on D. belonging to; feeding on 91.91.—— Is it _____ the bad smell that is difficult ? — Of course. A. how getting rid of B. got rid of C. to get rid of D. being got rid of 92.92.—— Have you made up your mind _____ the chance to go to France? — No. I’m practicing _____ the French language.A.to give up; to learn B.to give up; learning C.giving up; to learn D.giving up; learning 93.Never _____ off your coat; it’s rather cold outside.A. take B. taking C. to take D. taken 94.A big factory has been set up in this area ___ such goods for people all over the country. A. to produce B. producing C. produced D. being produced 95.The _____ look in her face suggested that she _____ it before. A. surprising; wouldn’t know B. surprised; hadn’t knownC. surprising; hadn’t known D. surprised; shouldn’t know96.You have no business _____ to me the way you did yesterday. A. about talking B. talking C. talked D. on talking 97.___ what he can do. He might get a job tomorrow. He might stay out of work for weeks. A.We didn’t know B .He doesn’t knowB.He doesn’t know C.There is no knowing D.It was known that 98.John’s bad habit is _____ without thorough understandingA.read B.being read C.to be read D.reading 99.She reached the top of the hill and stopped _____on a big rock by the side of the path A.to have rested B.resting C.to rest D.rest 100.We must treasure every minute because _____ time is _____ forever. A.lost; losing B.lost; lost C.losing; losing D.losing; lost 非谓语动词专项练习答案及部分解析:非谓语动词专项练习答案及部分解析:1.A 。
《小数的意义和性质》专项 练习题
6、小数点左边的第一位是( )位,它的计算单位是( ),第二
位是( )位。它的计数单位是( )。小数点右边的第一位是(
)位,它的计算单位是( ),第二位是( )位。它的计数单位
是( ),千分位在小数点( )边第( )位,它的计数单位
是( )。
7、由7个1,5个0.1和9个0.01组成的小数是( )。
456729000000
1000000000
780608000
98756000
25、一个两位小数,保留一位小数后近似值是10.0,这个小数可能是(
)。其中最大的数是( ),最小的数是( )。
小数的意义和性质(2)
1、千分位的计算单位是( );0.143里共有( )个这样的计数
单位。
2、6个一,3个十分之一和5个百分之一组成的小数是( )。
6、小数点的未尾添上“0”或去掉“0”,小数的大小不变。
()
7、10个十分之一是1个百分之一。 ( )
8、所有的小数都比整数小。 ( )
9、小数和整数一样,每相邻的两个计数单位让的进率都是10.
()
10、大于0.4且小于0.6的小数只有0.5.( )
11、小数点右边第三位是百分位。 ( )
12、小数的数位越多,这个小数就越大。 ( )
0.1里面有( )个0.01,有( )个0.001.小数的意义和性质(3)
一、我会填。
1、一个小数由( )、( )和( )三部分组成。
2、小数点左边第二位是( )位,它的计数单位是( ),第四位是
( )位,它的计数单位是( )。小数点右边第一位是( )位,它
的计数单位是( ),第三位的计数单位是( )。
),最小是( )。
16\、一个三位小数,精确到百分位后是4.80,这个三位小数最大是(
光的反射专项练习30题(有答案)OK
光的反射专项练习30题(有答案)一.选择题(共10小题)1.甲乙两人在照同一个镜子.甲在镜中看到了乙的眼睛,下列说法正确的是()A.乙也一定能看到甲的眼睛B.乙可能看到甲的眼睛C.乙不可能看到甲的眼睛D.乙不可能看到甲的全身2.现代社会的发展,引起了许多新的污染,如光污染越来越严重,城市建筑物上用的玻璃幕墙、釉面砖墙、磨光大理石和各种涂料都能造成光的污染,影响到人们的正常生活,那形成这种污染的主要原因是由于()A.光的反射B.光的折射C.光具有能量D.光沿直线传播3.下列现象中属于光的折射的是()A.在路灯下行走的人会在地面形成自己的影子B.在潜水艇中,用潜望镜观察水面上的景物C.黑板发生“反光”现象D.近视眼的人带近视镜看清物体4.一只鸟在平静的湖面上飞翔,有时我们看到好像鸟在水中游,有时能看到鸟的阴影在水面上移动,下列说法中正确的是()A.前者是由于光的反射形成的,后者是由于光沿直线传播形成的B.前者光线较强,后者光线较弱,两者形成的原理相同C.前者是鸟的虚像,后者是鸟的实像D.前者是鸟的影,后者是鸟的像5.宋代文学家范仲淹在名篇《岳阳楼记》中写道:“皓月千里,浮光跃金,静影沉璧”,下列说法中正确的是()A.“静影沉璧”是反射形成的虚像B.“静影沉璧”是折射形成的实像C.“皓月”是人造光源D.“皓月”是自然光源6.如图,寓言故事“猴子捞月”中的小猴子看到井中有个月亮,以为月亮掉进井水中了.以下说法中正确的是()A.水中出现月亮属于光的反射现象B.水中出现月亮属于光的折射现象C.水中的月亮到水面的距离与天上的月亮到水面的距离相同D.水中的月亮与天上的月亮一样大7.光线从空气斜射入水中,与水面夹角为40°,则入射光线与反射光线的夹角为()A.40°B.50°C.80°D.100°8.下列关于反射的说法中正确的是()A.镜面反射遵从反射规律,漫反射不遵从反射规律B.从各个方向都能看到黑板上的字,原因是黑板很平,能发生镜面反射C.从各个方向都能看到桌子的原因是桌子表面凸凹不平,发生漫反射D.入射光线与镜面夹角变大时,反射角也变大9.俗话说“冬不穿白,夏不穿黑”.对于这句话的解释,下列说法正确的是()A.是为了迎合时尚B.仅仅是人们穿衣的一种习俗C.白色衣服和黑色衣服反射光、吸收光的本领一样D.白色的衣服更易反射光,不利于保暖;黑色的衣服吸光更强,产生更多的热能10.经验丰富的汽车驾驶员在夜间驾驶汽车时,利用汽车灯照亮路面,并能根据路面灰色或黑色的变化判断道路的状况,这里路面颜色变化是发生了()A.光的反射现象B.光的折射现象C.海市蜃楼现象D.平面镜成像11.有一条南北走向的河,两岸风景如画,上午七八点钟的时候,某同学想用照相机拍一张带有水中倒影的风景照片,那么该同学应站在河的_________岸(选填“东”或“西”)拍摄,这一选择是根据光的_________规律而作出的.12.一条光线垂直射向平面镜,反射光线与入射光线的夹角是_________度,若保持光的传播方向不变,而将平面镜沿逆时针方向转动20°角,则反射光线又与入射光线的夹角是_________度.13.雨后天晴的夜晚,人在月下行走,为了不踩到地上的积水,若迎着月光走,走_________处,若背着月光走,应走_________处.(选填“亮”或“暗”)14.当入射光线与水平面的夹角为30°时,则反射角是_________,入射光线与反射光线之间的夹角为_________,若入射角增大10°,则反射光线与入射光线之间的夹角增大了_________.若太阳光垂直射向水面,则入反射角是_________.15.“不识庐山辜负目,不食螃蟹辜负腹”,又到了吃螃蟹的好时节,在蒸螃蟹时:(1)锅内发出“嗞嗞”声,是由于声音是由物体的_________而产生的,听到的“嗞嗞”声是通过_________传播到我们的耳朵;(2)锅内冒出“白汽”,是水经历了先_________后_________的物态变化过程,“白汽”的实质是水的_________态;(3)蒸熟的螃蟹看起来是红色的,这是因为蟹壳_________(填“反射”或“折射”)红光.16.成语“一叶障目不见森林”中蕴涵的物理知识是_________.在暗室里我们什么也看不到,是因为_________;打开电灯我们就能看到室内的物体了,这是因为室内物体_________.17.一束激光射到平面镜上,当入射角是30°时,反射角是_________.物体在距平面镜3m处保持不动,若要使物体与镜中的像相距10m,则平面镜应向后移_________m.18.一束平行光照到平面镜上,反射光线应是_________光(填:“会聚”、“平行”或“发散”),这种反射称为_________反射.看电影时,人们能从不同方向看到电影银幕上的图象,这是由于光在银幕上发生了_________的原因.19. 物体对光的反射分_________反射和_________反射两类.现象共同点不同点结果反射都遵守光的反射定律镜面反射平行光反射后仍然反射反射面有许多微小凸凹不平平行光反射后向着方向20.位于我市市中心的五里湖因水清可鉴,湖水“水清可鉴”是由于光可以在水面发生_________(选题“镜面”或“漫”)反射,能形成物体的_________(选题“实像”或“虚像”).平面镜成像是物体反射的光或物体发出的光射到平面镜时发生了_________的结果.春日的镜湖公园分外妖娆,鸟语花香、绿柳成荫.从物理学的角度分析,“柳荫”是由于光的_________形成的.21.小文的房间东面有一个窗口,北面墙上挂了一面穿衣镜,早晨的阳光从窗口射入经穿衣镜反后会射到房间西南角的书桌上.请你在图中画出光线的传播路径.22.物体对光的反射分镜面反射和漫反射两种,小强想:如果只有镜面反射而没有漫反射的话世界会变成什么样子呢?23.把毛玻璃放在书上的话,书上的文字就看不见了;如果在毛玻璃的粗糙面上涂上一层水,就会把毛玻璃变成透明的了,这是为什么?如果毛玻璃用来做浴室的门,又应该如何安装才科学呢?24.如图所示,水平地面上有一障碍物ABDC,较大平面镜MN在某一高度水平放置,试用作图法求出眼睛位于O 点从平面镜中所能看到障碍物后方地面的范围.如果想在原处看到更大范围的地面,水平放置的镜子的高度该怎样改变?答:_________.25.(1)完成下列光路并标出反射角的度数(图a).(2)作出物体AB在平面镜中所成的像(图b).(3)作出点N在平面镜中像的位置,并完成OM的光路(图c).26.甲、乙两位同学对下列问题有不同的看法:晚上,为了能看清自己的面部,甲认为应当用光源照亮镜子;乙认为应当用光源照亮面部.谁的意见正确?说明理由.27.通常在十字路口安装的监控摄像头可以拍下违章行驶的汽车照片,观察照片我们可以发现,车的外部很清楚,但几乎看不见车内的人.这是为什么?28.阅读探究园艺家为什么会失败一个爱研究的园艺家想,植物叶子多数呈绿色,可能是植物喜爱绿色的缘故.于是他将温室的房顶和四周都安装绿色的玻璃,只让阳光中和叶子的颜色相同的绿光照射植物,他认为这样必将使植物生长的更快,产量更高.可是园艺家失败了,这是由于他不懂得物体的颜色构成所致.因为不透明体的颜色是由它反射的色光决定的,叶子呈绿色,说明植物反射的是绿光,也就是说明绿光正是植物不喜爱(或是对植物生长无用)的.只给植物照绿光,植物就会因缺少所需的其他色光而生长缓慢,甚至枯萎.请回答:(1)绿色植物喜欢什么颜色的光?答:绿色植物喜欢_________.(2)请你分析,红花会反射什么颜色的光?答:红花会反射_________.(3)文中提到:“不透明体的颜色是由它反射的色光决定的”.文章中有没有提到或暗示到,透明物体的颜色是由什么决定的?如果有,请在文章中标出来,并概括出有关结论.结论:透明物体的颜色是由_________决定的.29.北京时间12月19日,05﹣06赛季世界职业斯诺克排名赛UK英国锦标赛落幕,年仅18岁的中国神童丁俊晖在决赛中以10比6战胜史蒂夫﹣戴维斯获得冠军(如右图).图中是比赛中某时三个球的状态,请你运用光学知识画出丁俊晖打击A球击中C球进袋的示意图.(注:若碰击B球要罚分)30.利用如图装置进行“探究光的反射规律”实验:(1)将一束光贴着纸板A沿EO射到O点,若将纸板B向前或向后折,此时在纸板B上看不到反射光,这样做的目的是探究_________.(2)纸板A、B置于同一平面后,将入射光线EO向法线ON靠近时,看到反射光线OF_________(填:“靠近”或“远离”法线.)(3)改变入射光的方向,多测几组入射角和反射角.这样做的目的是_________.得到的结论是_________.(4)若将一束光贴着纸板B沿FO射到O点,反射光将沿图中的OE方向射出,说明光在反射时,_________.(5)平面镜的应用之一是改变光路.请写出一个应用实例:_________.参考答案:1.解:根据反射现象中光路的可逆性,既然乙的眼睛反射出的光线能再经过平面镜的反射后进入甲的眼睛,那么逆着这束光线,光路仍然是成立的,也就是从甲的眼睛反射出的光线经平面镜的反射后会进入乙的眼睛,所以乙一定能看到甲的眼睛.故选A2.解:建筑物的玻璃幕墙、釉面砖墙、磨光大理石等表面光滑,这些作为反射面的时候,都属于镜面反射,太阳光射到上面,入射光线被反射,从同一方向射出,光线很强,照到物体上会给人们的生活工作等造成很大的不便,称为白亮污染.故选A3.解:A、人的影子是由于光在同种均匀介质中沿直线传播形成的,此选项不符合题意;B、在潜水艇中,用潜望镜观察水面上的景物是利用平面镜成像原理,属于光的反射,此选项不符合题意;C、黑板发生“反光”现象是镜面反射现象,是光的反射原理,不符合题意;D、近视镜是凹透镜,对光线起发散作用,属于光的折射现象,符合题意.故选D4.解:平静的水面相当于平面镜,人看到看到鸟在水中游动是平面镜成的虚像,光的反射形成的;而鸟的阴影是由于光沿直线传播被小鸟挡住后,在后面形成小鸟的影子,所以鸟影是因光沿直线传播而形成的.故选A5.解:AB、“静影沉璧”是说景物在光滑的石壁中形成了倒影,这是平面镜成像现象,其实质是光的反射形成的虚像,故A正确,B错误;CD、月亮本身不能发光,是反射了太阳的光,因此,“皓月”既不是人造光源也不是自然光源,故CD错误.故选A6.解;A、水中出现月亮属于光的反射现象,故本选项正确;B、水中出现月亮属于光的反射现象,不是光的折射现象,故本选项错误;C、水中出现月亮是月亮的虚像,物距等于像距,即水中的月亮到水面的距离等于月亮到水面的距离,故本选项正确;D、水中出现的月亮是月亮的虚像,因为物体与虚像是等大的,所以水中的月亮与天上的月亮一样大,故本选项正确;故选ACD7.解:光与水面的夹角是40°,所以入射角为90°﹣40°=50°.根据光的反射定律,反射角也为50°.所以入射光线与反射光线的夹角是100°.故选D8.解:A、镜面反射和漫反射都遵守光的反射定律,故本选项错误;B、从各个方向都能看到黑板上的字,是因为黑板发生了漫反射,故本选项错误;C、从各个方向都能看到桌子的原因是桌子表面凸凹不平,发生漫反射,故本选项正确;D、入射光线与镜面夹角变大时,入射角变小,反射角也变小,故本选项错误.故选C9.解:白色衣服能反射所有的色光,冬天穿白色的衣服,不能吸收更多的热量,不利于身体吸收太阳的热.黑色衣服能吸收所有的色光,夏天穿黑色的衣服,会吸收更多的热量,使身体的温度升高,容易中暑.所以,“冬不穿白,夏不穿黑”.故选D10.解:当汽车灯光照射到不同路面上时,不同路面反射的光的颜色不同,有的是灰色,有的不反射光(黑色),经验丰富的汽车驾驶员据此判断道路的状况.故选A11.解:早晨太阳在河岸的东边,若站在西岸拍摄,阳光在水面发生镜面反射,使较强的光进入镜头,看不清倒影.若站在东岸拍摄,西岸的树木同样会把太阳光反射到水面上,且不会太强,符合摄影的要求,所以需要在东岸拍摄;这是根据光的反射定律原理得出的选择;故答案为:东,反射12.解:∵一条光线垂直射向平面镜时i1=0°∴r1=i1=0°,∴反射光线与入射光线的夹角是0°;将平面镜沿逆时针方向转动20°角时,i2=20°∴r2=i2=20°,∴反射光线又与入射光线的夹角是r2+i2=20°+20°=40°.故答案为:0;4013.解:(1)当迎着月光走时,地面发亮处有水,因为迎着月光走,月光射到水面上时,水面发生的是镜面反射,反射光几乎全部射入人的眼睛,而地面发生的漫反射,只有很少的光进入人的眼睛,所以此时水面亮,人应走暗处.(2)背着月光走时,地面发暗处有水.因为背着月光虽然水面仍然是镜面反射,但是此时的反射光全部射到人的后背,几乎没光射入人的眼睛;而地面是漫反射,反射光线射向不同的方向,故有光线射入人的眼睛,故此时地面较亮,所以地上暗处部分是水,人应走亮处.故答案为:暗、亮14.解:根据光反射定律,反射光线、入射光线分居法线两侧,反射角等于入射角.此时入射光线与镜面的夹角为30°,则入射角为90°﹣30°=60°,由于反射角等于入射角,所以反射角也为60°.则入射光线与反射光线之间的夹角为:60°+60°=120°;当入射角增大10°时,则反射角也增大10°,则反射光线与入射光线之间的夹角增大了10°+10°=20°当入射光线垂直射向镜面时,入射角为0°,则反射角也为0°,故答案为:60°;120°;20°;0°15.解:(1)蒸螃蟹时听到的“嗞嗞”声是由物体的振动产生的,此声音会通过空气传播到我们耳朵里的;(2)锅内水在加热过程中变成水蒸气,水蒸气遇冷又会变成小液滴,从表面看就是“白汽”,它是液态的;(3)蟹盖是红色的,所以红色物体吸收其它所有颜色的光只反射红光,红光反射到我们眼睛,所以我们看到它是红色的;故答案为:(1)振动,空气;(2)汽化,液化,液;(3)反射16.解:“一叶障目不见森林”中蕴涵的物理知识是光沿直线传播.在暗室里我们什么也看不到,是因为室内没有光的反射;打开电灯我们就能看到室内的物体了,这是因为室内物体反射的光进入人的眼里.故答案为:光沿直线传播;室内没有光的反射;反射的光进入人的眼里17.解:(1)入射角为30°,根据光的反射定律的内容,反射角也为30°.(2)物体在平面镜中成虚像,物像到平面镜的距离相等.物体距平面镜3m,物像之间的距离是6m,要使物像之间的距离是10m,物体到平面镜之间的距离是5m,物体的位置不变,所以平面镜向后移动2m.故答案为:30°;218.解:平行光线入射到平而光滑反射面上,反射光线还是平行射出,这种反射是镜面反射;银幕是凹凸不平的,平行光线入射到粗糙的银幕上,反射光线射向四面八方,进入不同方向的人的眼睛,不同方向的人们都能看到.因此光在银幕上发生漫反射.故答案为:平行;镜面;漫反射19.物体对光的反射分镜面反射和漫反射两类.镜面反射与漫反射比较如下:现象共同点不同点结果反射都遵守光的反射定律镜面反射平行光反射后仍然平行反射反射面有许多微小凸凹不平平行光反射后向着不同方向20.解:平静的湖水相当于平面镜,湖水“水清可鉴”说明湖水中出现了物体的像,该像是由于光可以在水面发生镜面反射,形成物体的像,像是反射光线反向延长线相交得到的,所以该像是虚像;平面镜成像是物体反射的光或物体发出的光射到平面镜时发生了反射的结果.“柳荫”就是柳树的影子,它是由于光的直线传播,在遇到不透明的柳树时,光就无法传播过去,于是就在柳树的后面形成一个黑暗的区域,便是影子.故答案为:镜面;虚像;反射;直线传播21.解:作书桌关于镜面的对称点,连接窗口与对称点,与镜面的交点即反射点,连接书桌和反射点即可.如图;22.解:如果只有镜面反射,没有漫反射:情景①我们将无法行走,因为路面及周围的其他物体反射的太阳光会使人睁不开眼;情景②我们将无法阅读和上网,我们上课闭着眼听老师闭着眼讲课,因为师生间都有强光反射23.解:因为毛玻璃上粗糙,发生的漫反射,光线都被反射回去了不能透过玻璃,涂上水以后光线就可以透过了,就会把毛玻璃变成透明的了;如果毛玻璃用来做浴室的门,粗糙的一面朝外.假如粗糙的一面朝里,洗澡时的水汽凝结在表面会将原本粗糙的表面“填平”,使外面的人能看到里面,导致春光外泄24.解:①将O点看成是一个发光点.作O点在平面镜中的像O′,连接OA交MN于F,连接O′F交地面于H;连接O′B交MN于E,交地面于G,连接OE,标上箭头,光线传播方向如图所示.入射光线为HF、GE;反射光线为FO、EO.图中GH所围区域就是眼睛位于O点从平面镜MN中所能看到障碍物后方地面的范围.②假定水平放置的镜子的高度降低至与障碍AB面接触,眼睛就看不到障碍物后面的地面,因此,如果想在原处看到更大范围的地面,水平放置的镜子在高度该增高(即向上移动).故答案为:向上移动25.解:(1)过入射点作法线,由反射光线与镜面的夹角为45°可知,则反射角为90°﹣45°=45°,再根据反射角等于入射角作出反射光线,这条反射光线正好垂直射向另一平面镜,则其反射光线将按原路返回.(2)解:根据像物关于平面镜对称,作出A点的对称点A′,同理作出B点的对称点B′,用虚线连接A′B′,即为AB的像.如图:(3)据平面镜成像规律作出点N的像点N’,连接N’N,交于镜面于一点O,该点为入射点,然后连接OM、ON,画上箭头即可.如下图所示:H26.解:用光源照亮面部,发生漫反射,再通过镜子反射进入人眼,人就能够看到自己的脸;反之用光源照亮镜子,发生镜面反射,会更加看不清楚而且刺眼;故乙的意见正确27.答:观察照片可以发现,几乎看不见车内的人,是因为车内的人反射的光很弱,摄像头几乎无法成像28.解:(1)不透明体的颜色是由它反射的色光决定的,叶子呈绿色,说明植物反射的是绿光,吸收的是其它各种色光.(2)红花是不透明的物体,反射与它相同颜色的红光;(3)根据题中提到的“他将温室的房顶和四周都安装绿色的玻璃,只让阳光中和叶子的颜色相同的绿光照射植物”,这句话就说明了透明物体的颜色是由其透过的色光所决定的.故答案为:(1)除了绿色光以外的光(2)红光(3)其透过的色光29.解:打桌球实际上利用台边的反射,也遵守光的反射定律,本题有两种画法,如图1、图2所示:30.解:(1)将一束光贴着纸板A沿EO射到O点,若将纸板B向前或向后折,此时在纸板B上看不到反射光,这样做的目的是探究反射光线、法线、入射光线是否在同一平面内.(2)根据反射定律的内容可得,反射角等于入射角.若入射光线靠近法线,则入射角减小,反射角也随之减小,故反射光线将靠近法线.(3)为避免实验的偶然性,可以改变入射光线的方向,再观测几组入射角和反射角,这样做的目的是为了多次实验,找出普遍存在的规律,避免偶然性,可以归纳出一般性结论(反射角等于入射角).(4)当光逆着原来的反射光线入射时,反射光线也逆着原来的入射光线反射出去,这说明在反射现象中光路是可逆的.(5)自行车上的角反射器,百货商店安装镜子是起到成像的作用,让顾客买衣服后,观看穿着效果;潜望镜应用了平面镜的两个作用,改变光的传播路线和成像.故答案为:(1)反射光线、入射光线和法线是否在同一平面内;(2)靠近;(3)多次实验,找出普遍存在的规律,避免偶然性;反射角等于入射角;(4)光路是可逆的;(5)角反射器(潜望镜、用平面镜将井底照亮)。
句子专项训练(练习题+答案版)
语文总复习——句子专项训练一.改变句型:1.把下列句子改写成反问句。
(1)像桑娜那样品德高尚的人值得赞扬。
像桑娜那样品德高尚的人难道不值得赞扬吗?(2)为了把祖国建设得更强盛,我们应该努力学习。
为了把祖国建设得更强盛,我们难道不应该努力学习吗?(3)少先队员应该讲文明,有礼貌。
少先队员难道不应该讲文明,有礼貌吗?2. 把下列句子改成陈述句。
(1)人的聪明与愚笨,难道是天生的吗?人的聪明与愚笨,不是天生的。
(2)毒刑拷打算得了什么?死亡也无法叫我开口。
毒刑拷打算不了什么。
死亡也无法叫我开口。
(3)实现四个现代化,难道不是全国人民的伟大历史任务吗?实现四个现代化,是全国人民的伟大历史任务吗。
3. 把下面句子改变人称换个说法。
(1)美丽的姑娘说:“我是智慧的女儿。
”美丽的姑娘说,她是智慧的女儿。
(2)一位台湾同胞说,他是中国人,他爱中国。
一位台湾同胞说:“我是中国人,我爱中国。
”(3)小明高兴地告诉妈妈,他在新华书店买了一本《雷锋日记》。
小明高兴地告诉妈妈:“我在新华书店买了一本《雷锋日记》。
”4. 将下列句子改为第三人称转述(1)贝多芬说:“我是来弹一首曲子给这位姑娘听的。
”贝多芬说,他是来弹一首曲子给这位姑娘听的。
(2)小红说:“今天下午学校组织到野外活动,我必须参加。
”小红说,今天下午学校组织到野外活动,她必须参加。
(3)蔺相如说:“这块璧有点儿小问题,让我指给您看。
”蔺相如说,这块璧有点儿小问题,让他指给您看。
(向秦王转述)蔺相如说,这块璧有点儿小问题,让他指给秦王看。
(向他人转述)5. 按要求改写句子。
(1)我们很快就学会了新的技术。
(把字句)(被动句)我们很快就把新的技术学会了。
新的技术很快就被我们学会了。
(2)浓墨似的乌云一下子遮黑了半边天。
(把字句)(被动句)浓墨似的乌云一下子把半边天遮黑了。
半边天一下子被浓墨似的乌云遮黑了。
(3)生活在八十年代的青年人是多么幸福啊!(陈述句)生活在八十年代的青年人很幸福。
语文选择题专项练习及答案
一、选择题(题型注释)1.下列词语书写正确....的一项是(3分) ( )A.真谛遒劲妇孺皆知识破天惊 B.羸弱羁绊变换多姿叱咤风云C.疲倦蜷伏踌躇满志略胜一筹 D.怪诞嗔视躹躬尽瘁义愤填鹰2.下列加点字注音有误....的一项是(3分)( )A.归省.(xǐng)行.辈(háng)棹.着(zhào)晦.暗(huì)戛.然而止(jiá)B.颦蹙.(cù) 嗔.视(chēn) 阴霾.(mái) 疮.痍(chuāng) 尽态极妍.(yán)C.颛顼.(xū) 呓.语(yì) 吞噬.(shì) 虫豸.(zhì) 叱咤.风云(zhà)D.羸.弱(léi) 荫.庇(yīn) 砭.骨(biān) 荷.笠(hé) 毛骨悚.然(sǒng)3.下列加点成语使用最恰当的一项是()(3分)A.正赶上汛期,江水很大,络绎不绝....,让人很是担心。
B.那位老人脸上已有不少皱纹,一身纳西族的装束却穿戴得一尘不染....。
C.写事件,不写其来龙去脉,只取其涉笔成趣的地方加以渲染,一丝不苟....,含蓄浓缩。
D.老同学难得一聚,畅饮赋诗,高谈阔论....,尽显才情,好不自在。
4.下列句子没有语病的一项是()(3分)A.通过社会实践活动,让我们接触了社会,开阔了视野。
B.阅读优秀的文学作品,既能增长知识,又能丰富情感。
C.具有认真负责的工作态度,是一个人事业成败的关键。
D.为防止不再发生类似的伤害事故,政教处采取了很多安全措施。
5.下列注音完全正确的一项是()(3分)A.憩.息(qì)蹇.劣(jiǎn)剽.悍(biāo)岑.寂(cén)B.跳踉.(liáng)聆.听(líng)奢.侈(shē)隽.妙(jùn)C.德馨.(xīn)惊觉.(jué)案牍.(dú)蛰.伏(zhé)D.分娩.(miǎn)怒不可遏.(è)怡.然自得(yí) 远遁.(dùn)6.下面一段文字的划线句子中,有语病的一项是()(3分)A.在德国,喜欢吃鱼的家庭中,长年备着一种药丸。
部编版四年级语文下册句子专项练习题及答案
部编版四年级语文下册句子专项练习题及答案一、选择题1. 下列句子中,没有标点符号的是()。
A. 小狗在跑B. 天空中飘着白云C. 妈妈正在做饭D. 我们去爬山吧答案:A2. 下列句子中,没有语病的是()。
A. 他们喜欢玩得很开心B. 小明买了一个漂亮的玩具C. 妹妹每天都要听音乐D. 他对这个问题很感兴趣答案:B3. 下列句子中,没有错别字的是()。
A. 我们明天就出发了B. 妈妈在给我炖鸡汤C. 奶奶给我织了一件毛衣D. 爸爸带我去钓鱼答案:A二、填空题1. 他___去过动物园。
答案:曾经2. 这本书___很有趣。
答案:看上去3. 爷爷长得___。
答案:高高的4. 她唱歌___,很动听。
答案:高亢三、改错题将下列句子中的错误部分划线,并在句子后面写出正确的句子。
1. 我昨天去看了一台表演。
答案:我昨天去看了一场表演。
2. 弟弟喜欢看有趣的卡通片。
答案:弟弟喜欢看有趣的卡通。
3. 妈妈在外面买了一些好吃的水果。
答案:妈妈在外面买了一些好吃的。
四、连词成句将单词重新排列组成一个完整的句子。
1. 爸爸、游泳、喜欢。
答案:爸爸喜欢游泳。
2. 昨天、我们、公园、去、了。
答案:我们昨天去了公园。
3. 小花、跑得、快、很。
答案:小花跑得很快。
五、阅读理解阅读短文,回答问题。
小明是一个爱动物的小朋友。
他家养了一只小狗,叫做旺财。
旺财很聪明,它会摇头、摇尾巴、握手等等。
小明每天都会和旺财玩耍,他们是最好的朋友。
1. 小明家养了什么动物?答案:小狗2. 旺财会做些什么动作?答案:摇头、摇尾巴、握手等等。
3. 小明和旺财是什么关系?答案:最好的朋友以上是部编版四年级语文下册句子专项练习题及答案。
希望对你有帮助!。
- 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)。
Lesson1 小升初真题:
(2017郑州小升初K6联赛)
Look at the man over there. He is ____ uncle .
A Jim’s and Tim’s
B Jim’s and Tim
C Jim and Tim
D Jim and Tim’s
(2017石家庄43中入学)
How many ______ do you have ?
A aunts
B aunt
C aunty
(2013西安电科大附中入学)
It’s a _______.
A my family’s photo
B my family photo
C photo of my photo
D photos of my family
家庭成员专项练习题
一根据提示写出英语单词。
1 __________ my mother’s mother
2___________ my uncle’s son
3 __________ my father’s sister
4 __________ my father ’father
5 __________ my mother’s brother
6___________ my father’s mother
二补全单词
1 f _ th_ _
2 _ _ ther
3 b _ _ th _ _
4 gr_ _dpar_ _ _
5 cou_ _ _
6 ta_ _
7 _ _ ort
8 f_ t
9 th_ n 10 _ _ cle 11 _ un _ 12 sis_ _ _
三选择填空。
1 She _____ tall ,she is my mother .
A are
B is
C has
2 My father can move the big stone , he is ______
A tall
B weak
C strong
3 I’m 5 years old , He is 10 years old ,He is my _____
A father
B grandfather
C brother
4 He is tall , She is beautiful ,They _____ my parents .
A is
B have
C are
5 Who is she ? She is my mother’s _______
A brother
B son
C sister
四阅读理解。
My name is Sarah .I have a big family ,there are six people in my family . my grandparents are very kind .My mother is tall and thin and she is a teacher ,My father is strong and tall and he is a driver ,I have a big brother ,he is 14 years old ,he is in the middle school .
1Sarah’s father is short and strong. T / F
2There are five people in Sarah’s family .T / F
3Sarah has a big brother .T / F
4 Sarah is 14 years old . T / F
5 Sarah’s grandparents are very beautiful .T / F
Lesson 2 小升初真题
(2017长沙青竹湖湘一小升初)
She has a round face. Her hair _____ black and long .
A has
B is
C are
(2013 某电科大附中入学)
How many ______ do you have ?
A foot
B tooth
C teeth
D child
(2016 北京小升初)
These are ______ .You can buy a pair for your mother .
A woman sock
B women sock
C women socks
D woman socks
颜色身体部位练习题
一汉译英.
1 聪明的________
2 严格的________
3 棕色_______
4 橘色_______ 4颜色________ 6 身体_______ 7 可爱的________8 牙齿______
二根据汉语提示补全句子。
1 My mother is very thin ,she has long _____ (腿).
2How many _____(牙齿)do you have ?
3 She _______(有)a long brown hair .
4 She wears a blue ______(外套)。
5 Do you like a _____(绿色)apple or a ____(红色)apple?
三选择填空。
1 The monster ______three eyes , four legs .
A are
B has
C have
2 What are you _______?
A wear
B wears
C wearing
3My father is tall and ______ has big eyes .
A She
B he
C they
4In summer ,my sister usually wears a ______
A shoes
B dress
C hats
5Do you have a ______? No, I don’t.
A head
B tail
C body
四将下列句子按照正确的语序排列。
1 What color it is ?__________________________
2 is wearing She shoes green black pants and ._____________________
3 and father kind My is smart.______________________
4 beautiful mother Amy’s big has eyes she and is .___________________
五阅读理解。
My name is Andy, I’m a monster ,I have three eyes ,two mouths ,four arms ,one leg . I like beautiful clothes, I often wear a blue T-shirt , orange pants ,blue shoes .I don’t like to go to school ,I like to play games .
1 Andy is a monster . T / F
2 He has two eyes . T / F
3 He often wears orange shoes . T / F
4 Andy likes to go to school . T / F
Lesson 3 小升初真题。