七年级上基础训练题(2012秋新人教)
(2012秋)七年级练习册答案
A beautiful girl opened a book and it began to talk. Finally, I visited the Cooking Club. A girl put some food in a magic cooker, said some words, and opened the door. There was now a delicious cake in it. I like the Cooking Club best because I like to eat chocolate cakes very much. Integration
A 1 F In the Flying Club, Janet learnt to fly in the air like a bird. 2T 3T 4 F The people below looked very small to her. 5 F Flying was wonderful, but sometimes it was a bit dangerous. 6T
B
1 in 1978 2 last winter 3 in April 4 on Saturday afternoon 5 at 12:30 6 three days ago 7 yesterday 8 at midnight
C1
1 did, start 2 didn't start 3 started 4 didn't shout 5 Did, run 6 did, see
A3 1 Did you leave home early this morning? 2 When did you have lunch? 3 Did you return the book to the library yesterday? 4 What time did you come home? 5 When did you finish your homework? 6 Did you go to bed late last night?
七年级上册语文基础训练题
⽆忧考为⼤家整理的七年级上册语⽂基础训练题的⽂章,供⼤家学习参考!更多最新信息请点击⼀、根据提⽰默写原⽂。
1.⾬,是⼤⾃然的精灵,是古诗词中⾮常活跃的⾳符,请写出古诗词中描写⾬的句⼦:,。
(写出连续的两句)2.常建《题破⼭寺后禅院》:“ 。
”两句诗,写出了禅院幽静的环境,以及这幽景给⼈的启⽰。
3.《⽊兰诗》中描写战事频繁持久,战⽃激烈悲壮的诗句是:“ ,。
”4.2007年4⽉18⽇8时05分,江西省历⾸趟“和谐号”动车组发车,时速达到200千⽶,真是“ ,。
” (⽤郦道元《三峡》中的句⼦回答)5.2007年3⽉16⽇,⼗届⼈⼤五次会议举⾏记者招待会,温家宝总理在回答东森电视台记者关于台湾问题的提问时,引⽤刘禹锡《酬乐天扬州初逢席上见赠》中的诗句“ ,。
” 说明“海峡两岸和平发展是⼤势所趋,是任何⼈⽆法改变的”。
6.温总理在谈及中美贸易摩擦时,他引⽤了杜甫《望岳》中的名句“ ,。
” 喻⽰我们同样需要这种⾼瞻远瞩的战略眼光。
7.《六则》中论述“学”与“思”辩证关系的句⼦是,。
8. 《六则》中表明随时随地向他⼈学习的句⼦是,。
,其不善者⽽改之。
9. 《六则》中表明君⼦良好的做⼈品⾏的句⼦是,,刚起头⼉,有的是⼯夫,有的是希望。
11.《夜⾬寄北》中表现作者渴望与亲⼈相见⼼情的诗句是,。
12. 《酬乐天扬州初逢席上见赠》中通过⽤典表现诗⼈⽆限惆怅⼼怀的诗句是,。
13.《送杜少府之任蜀州》⼀诗中道出惜别之意和宽慰之情的诗句是,。
14.《淮上与友⼈别》中最能体现离情别绪的⼀句是,点明诗⼈与友⼈握别后各⾃去向的句⼦是。
15.《三峡》描写群⼭连绵不断的句⼦是,。
16.《观沧海》中通过丰富奇特的想象表现曹操⽓吞⼭河,囊括宇宙的⽓概的句⼦是,;,。
17.《闻王昌龄左迁龙标遥有此寄》中把明⽉⼈格化表达对友⼈被贬遭遇的深切同情和关怀的句⼦是,。
18.《登飞来峰》中借景抒情表达作者踌躇满志的情怀的句⼦是,。
19.《望岳》中表现诗⼈不怕困难,敢于攀登,俯视⼀切的雄⼼和⽓概的诗句是,。
七年级英语上册单元基础测试题全套(最新人教版,带答案)
七年级英语上册单元基础测试题全套(最新人教版,带答案)七年级英语上册单元基础测试题全套本文档按单元共9套测试题,每套重单元基础,重实用性,带答案Unit1 My name's Gina.基础练习一、单项选择1. --- What your name, please?--- My name Li Lei.A. are; isB. is; isC. am; isD. is; am2. What your sister's name?A. areB. doesC. isD. were3. He is my friend. name is Frank.A. MyB. HerC. HisD. Your4. Hi! This is teacher. name is Linda.A. your; MyB. his; YourC. your; HerD. her; His5. --- Are you a student? --- .A. Yes, we areB. Yes, I amC. No, we areD. No, I am6. --- your name? --- I'm Li Ling.A. What'sB. How isC. IsD. What7. her name?A. WhatB. HowC. How isD. What's8. --- Hello! What's name?--- Hi, Mary! She is Jane.A. myB. hisC. herD. your9. This is my friend. name is Tony.A. HisB. YourC. HerD. My10. --- Is red your favourite, Danny? --- .A. Yes, I doB. Yes, I amC. No, it isn'tD. No, I don't11. --- ? --- It's "Bb".A. Where is itC. What's your nameD. Who is this12. What your English name?A. areB. isC. /D. am13. --- Is this your sister? --- Yes, it is. name is Linda.A. YourB. MyC. HisD. Her14. ---What is the girl's name? --- name is Michael.A. MyB. YourC. HisD. Her15. --- Are you Betty? ---A. Yes, I'm.B. No, it isn't.C. Yes, it is.D. No, I'm not.16. --- What the girl's name? --- Lin Fang.A. amB. isC. areD. be17. --- your name, please? --- name is Gina Smith.A. What; IC. What's; MyD. What; My18. --- What's name? --- Her name is Wang Mei.A. myB. hisC. herD. your19. Is your aunt? What's name?A. he; hisB. she; herC. he; herD. she; his20. --- Excuse me, are you Tina? --- .A. No, I amB. Yes, I amC. Yes, I'mD. No, I amn't二、单词拼写(单句首字母填空)21. I'm a m school student(学生).22. Six and two is e .23. This is our f lesson. So I don't know all your names.24. What's your t number? It's 555-0192.25. There are s days in a week.26. I have a good f . Her name is Jane.27. My name is Guo Hui. Guo is my l name.28. Nice to m you.29. We studied in No.1 M School in 2007.30. Two and six is e .三、单词拼写(根据中文提示拼写单词)31. Seven and two is (九).32. Frank has three good f (朋友) at school.33. --- How is your teacher, Nancy?--- (她) is fine.34. I go to (学校) at 7 in the morning and go (家) at 4 in the afternoon.35. Last year he left the (中等) school and came to the city.36. Four and five is (九).37. Jane and Jim are my good (朋友). They are from the UK.38. This is my friend. (她) is English.39. Jane is a teacher in that (学校).40. His home is in the (中心) of the city.答案一、单项选择1. B2. C3. C4. C5. B6. A7. D8. C9. A 10. C11. B 12. B 13. D 14. D 15. D 16. B 17. C 18. C 19. B 20. B二、单词拼写(单句首字母填空)21. middle22. eight23. first24. telephone25. seven26. friend27. last28. meet29. Middle30. eight三、单词拼写(根据中文提示拼写单词)31. nine32. friends33. She34. school; home35. middle36. nine37. friends38. She39. school40. middleUnit2 This is my sister.基础练习一、单项选择1. Mum, is my friend, Li Lei. Li Lei, is my mother.A. he; sheB. she; heC. this; thisD. this; that2. --- Are your keys? --- Yes, they are. They're .A. this; myB. that; mineC. these; myD. those; mine3. --- ? --- He is my favourite basketball player in our school.A. Where is JimB. Who is JimC. How is JimD. What is Jim4. --- is the woman over there? --- She is my mother.A. WhatB. WhoC. HowD. Where5. --- What are these? --- classrooms.A. These areB. This isC. They areD. That is6. is my friend, and is my brother.A. This; thatB. This; heC. This; thoseD. It; these7. boys over there(那儿) are my cousins. They are in front ofa tree.A. ThatB. ThisC. ThoseD. These8. --- is that tall boy? --- He's my classmate.A. WhatB. WhereC. WhoseD. Who9. --- is she? --- She is my sister.A. HowB. WhereC. WhoD. What10. I have two pairs of shorts. are nice.A. ShortsB. ItC. TheseD. They11. Look! is a pen. And are pencils.A. This; thatB. These; thoseC. This; thoseD. Those; this12. My English teacher said I was lazy, but was wrong.A. theseC. thoseD. that13. --- is he? --- He is Tom's father.A. WhatB. WhoC. HowD. What color14. --- is the girl in the photo? --- She is my cousin, Lily.A. WhoB. WhatC. WhereD. When15. --- What are those? --- are cakes.A. ThatB. TheseC. ItD. They16. --- Hello, Tina. is my friend, Helen.--- Nice to meet you, Helen.A. ThisB. ThatC. ItD. They17. girls over there (在那边) are my friends Jane and Linda.A. ThisB. ThatC. ThoseD. These18. --- is the boy? --- He is my brother.B. WhoC. WhatD. How's19. --- is the girl in the photo? --- She is my cousin, Lucy.A. WhatB. WhoC. WhereD. When20. --- Are these your English books?--- No, aren't. They're English books.A. it; theyB. these; heC. they; herD. their; she二、单词拼写(单句首字母填空)21. This is my u . He is my mother's brother.22. --- Are they your father and mother?--- Yes, they're my p .23. Does she have any brothers or s ?24. My a is my father's sister.25. My name is Jenny Brown. Mr. Brown is my father. I'm hisd .26. Hello, I'm Bob. My f name is White.27. Good morning, boys and g . Let's begin our class.28. This is a p of your classroom. Can I have a look at(看一看) it?29. Alice is my sister. I am her b .30. My uncle's children are my c .三、单词拼写(根据中文提示拼写单词)31. Gina has four family (照片) in her bag.32. My parents' son is my (弟弟).33. This (女孩) is a teacher. She works in a school.34. I'm Lucy and my (姐妹) is Lily.35. Who is the (下一个)?36. Andy is my (表妹).37. I'm not a girl. I'm my parents' (儿子).38. Her (父母) aren't in this photo.39. She is my (舅母), my uncle's wife.40. Mrs. Smith has two (女儿)—Mary and Cindy.答案一、单项选择1. C2. D3. B4. B5. C6. A7. C8. D9. C 10. D11. C 12. D 13. B 14. A 15. D 16. A 17. C 18. B 19. B 20. C二、单词拼写(单句首字母填空)21. uncle22. parents23. sisters24. aunt25. daughter26. family27. girls28. picture/photo29. brother30. cousins三、单词拼写(根据中文提示拼写单词)31. photos32. brother33. girl34. sister35. next36. cousin37. son38. parents39. aunt40. daughtersUnit3 Is this your pencil?基础练习一、单项选择1. --- Is this your ID card? --- Yes, .A. this isB. it'sC. they areD. it is2. --- Is that your marker? --- .A. Yes, that isB. Yes, it'sC. No, it isn'tD. No, that isn't3. --- Are these his cousins? --- . They are his brothers.A. Yes, they areB. No, these aren'tC. Yes, these areD. No, they aren't4. --- Are those your brothers? --- Yes, .A. these areB. those areC. they areD. they're5. These books are . books are over there.A. my; YoursB. your; MineC. mine; YoursD. yours; My6. Some of the books belong to me, while the others are .A. him and herB. his and hersC. his and herD. him and hers7. This isn't book. Is it ?A. my; yoursB. my; yourC. mine; yoursD. mine; your8. --- This is not watch. I think it's .--- Oh, I see. Thank you.A. your; myB. she; hisC. his; hersD. my; her9. --- ? --- No, it isn't.A. Is this your eraserB. What's thisC. Who's thisD. Are they your pencils10. --- Is that his dictionary? --- .A. Yes, it isn'tB. No, that isn'tC. Yes, he isD. No, it isn't11. --- Are they his cousins? --- . They are his brothers.A. No, they aren'tB. No, these aren'tC. Yes, these areD. Yes, they are12. --- Are those books on the desk yours? --- . Mine are here.A. Yes, these areB. No, these aren'tC. No, they aren'tD. Yes, they are13. Would you please lend me English book? isn't here.A. your; IB. your; MineC. yours; Mine14. --- Is the red book ? --- No, is blue.A. your; my bookB. Tom's; hersC. his; heD. yours; mine15. This is Mp4. is over there.A. mine; yoursB. my; YoursC. my; YourD. mine; Yours16. These are apples. are in the bag.A. her; YouB. mine; YourC. our; HersD. his; My17. --- Is this a desk? --- .A. Yes, that isB. Yes, it'sC. No, it isn'tD. No, that isn't18. --- Is that a book? --- . It's a dictionary.A. It's notB. Yes, it isC. No, it isn'tD. No, it is19. --- these her hats? --- No, they .A. Is; isn'tB. Am; areC. Are; isn'tD. Are; aren't20. --- Are those your parents? --- Yes, .A. those areB. they'reC. they areD. those're二、单词拼写(单句首字母填空)21. Is that her e ?22. Her mother is a t she teaches in a school.23. I can't do it by myself. Can you h me?24. --- I like playing c games. What about you?--- Me, too.25. There is a l in our school. We can borrow books from it.26. I have a chair and a desk in my c .27. I lost my notebook. I must f it.28. --- Thank you for your help.--- You're w .29. --- What's this in English?--- It's an e .30. This is my t , Miss. Lee.31. Can I h you?32. I like to play c games very much.33. There is an electronic(电子的) reading-room in our l .34. He is writing in the c now.35. Have you seen my pen? I can't f it.36. --- Thank you for your advice, Jenny.--- You're w .37. I have an e . I use(使用) it to correct(改正) the words.38. Selina is our new t this term(学期). She teaches us English.39. Many thanks for your h , Mr. King.40. Many people use c to send emails.三、单词拼写(根据中文提示拼写单词)41. The d (字典) is very useful.42. Some students do their homework on the (电脑).43. My uncle likes to go to different kinds of (图书馆) all over the world.44. May I (问) you a question?45. There is an (橡皮) and some pens on Tom's desk.46. I like playing (棒球).47. He saw lots of (手表) in the store.48. The (游戏) is OK.49. This is Kate's English d (词典).50. (计算机) are widely used in the modern world.答案一、单项选择1. D2. C3. D4. C5. D6. B7. A8. C9. A 10. D11. D 12. C 13. B 14. D 15. B 16. C 17. C 18. C 19. D 20. C二、单词拼写(单句首字母填空)21. eraser22. teacher23. help24. computer25. library26. classroom27. find28. welcome29. eraser30. teacher31. help32. computer33. library34. classroom35. find36. welcome37. eraser38. teacher39. help40. computers三、单词拼写(根据中文提示拼写单词)41. dictionary42. computers43. libraries44. ask45. eraser46. baseball47. watches48. game49. dictionary50. ComputersUnit 4 Where's my schoolbag?基础练习一、单项选择1. The English book is the desk the room.A. on; underB. under; onC. over; inD. on; in2. --- Where are the keys? --- They are the drawer.A. atB. underC. inD. on3. Mrs. Green's flat is the eighth floor. She likes listening to music bed.A. at; underB. in; onC. by; onD. on; in4. most museums you can't make any noise.A. InB. OnC. AtD. Under5. Where he from? A. are B. is C. does D. has6. --- that? --- I think it's Sam.A. What'sB. Who'sC. WhoseD. Where's7. This is my pen, that is your pencil.A. inB. ofC. andD. but8. --- It's time for sports. --- Let's put on our sports shoes go to the playground.A. andB. orC. soD. but9. Mr. Wu is English teacher. He teaches English.A. they; themB. their; themC. their; theirD. them; their10. An old friend of my sister's always helps my brotherand with English.A. I; ourB. me; ourselvesC. I; myD. me; our11. My baseball is the floor, the table.A. on; underB. on; onC. under; underD. under; in12. The English book is the desk the room.A. on; underB. under; onC. under; inD. on; in13. A young man glasses came the office. He had an old bag his arm.A. without; in; inB. with; into; underC. in; out of; underD. with; in; on14. The box is empty. There is nothing it.A. onB. inC. under15. --- Where my socks, Mom?--- Sorry, I don't know. Maybe you put them under the bed.A. isB. amC. areD. have16. --- my books? --- on the bookcase.A. Where's; It'sB. What are; It's。
七年级上册语文基础训练题
七年级上册语文基础训练题初一语文难度加大,同学们要如何完成初一上册语文的基础训练题呢?接下来是店铺为大家带来的关于初一上册语文基础训练题,希望会给大家带来帮助。
初一上册语文基础训练题:一、基础知识及其运用:1、给加点字注音:A、应和( )琴弦( )B、嗥叫( )模样( )C、绿苔( ) 胆怯( )D、热忱( )翘望( )2、根据注音写汉字:酝niàng( ) 庇fù( )3、加点字解释有误的一项:( )A、忍俊不禁(含笑) 领域(泛指某种范围)B、暴雨猝至(突然)徒劳(徒然,白白的)C、小心翼翼(严肃谨慎)年逾九十(超过)D、有条不紊(不乱)声情并茂(丰富,精美)4、下列书写有误的一项:( )A、震震有词振怒B、抱怨报答C、暴躁5、加点词语感情色彩没有发生变化的一项( )A、我喜欢海,溺爱着海。
B、海终于愤怒了。
C、鸟儿将巢安在繁花嫩叶当中,高兴起来了,呼朋引伴地卖弄清脆的喉咙。
D、海燕像黑色的闪电,在高傲地飞翔。
6、填写关联词语正确的一项是:( )学习要靠理解力,要靠记忆力,而理解力和记忆力想一下子把什么都学会,其结果干燥 D、神秘蜜语飞cuàn( ) mí漫( ) 有多强,要理解和记住刚学过的东西,总要有一个过程,哪个人必定吃大亏。
A、尽管不但还不管所以B、因为不但还无论如果C、既然尽管也不论因为D、无论虽然但或者只要7、下列语句与原文不同的一项是:( )A、蠢笨的企鹅,胆怯地把肥胖的身体掩藏在悬崖底下……B、雷声轰隆。
波浪在愤怒的飞沫中呼叫,跟狂风争吼。
C、一堆堆乌云,像青色的火焰,在无底的大海上燃烧。
D、大海抓住闪电的箭光,把它们熄灭在自己的深渊里。
8、下面语句排序最恰当的是:( )①首先设法安慰自己,树立信心,镇定情绪,清除心理障碍。
②遇到无法下笔,思路阻塞,判断不清的难题时,不要着急。
③心理平静后再冷静思考就不怕难题了。
④这时候,你应该想:我难,别人也难,何必畏惧呢?A、②③④①B、①④②③C、②①④③D、①④③②9、文学常识对应有误的是:( )A、《春》B、《海燕》C、《丑石》朱自清高尔基贾平凹现代作家、学者《背影》俄国作家当代作家《母亲》《满月儿》D、《想念冰心》王蒙当代作家、学者《组织部来了个年轻人》10、根据要求默写课文原句:,不亦重乎? ,不亦远乎? 浅草才能没马蹄。
人教版数学七年级上册 第4章 4.1--4.3基础测试题含答案
人教版数学七年级上册第4章测试题含答案4.1几何图形一.选择题1.如果按图中虚线对折可以做成一个上底面为无盖的盒子,那么该盒子的下底面的字母是()A.D B.C C.B D.A2.某个几何体的展开图如图所示,该几何体是()A.平行四边形B.三角形C.三棱柱D.三棱锥3.已知某多面体的平面展开图如图所示,其中是棱锥的有()A.1个B.2个C.3个D.4个4.如图:CD是直角三角形ABC的高,将直角三角形ABC按以下方式旋转一周可以得到右侧几何体的是()A.绕着AC旋转B.绕着AB旋转C.绕着CD旋转D.绕着BC旋转5.把50个同样大小的立方体木块堆砌成如图所示的形状,现在从前、后、左右和上面五个方向朝这堆木块喷漆,则有()块完全喷不到漆.A.5B.7C.17D.226.下列图形,折叠后不能围成正方体的是()A.B.C.D.7.新年快到了,小聪制作了一只正方体灯笼,并在每个面都写上一个汉字,将正方体灯笼展开如图所示,那么在该正方体灯笼中,在“祝”相对面上的汉字是()A.新B.年C.快D.乐8.按如图所示图形中的虚线折叠可以围成一个棱柱的是()A.B.C.D.9.如图,下面的平面图形绕轴旋转一周,可以得到圆柱体的是()A.B.C.D.10.在课题学习中,老师要求用长为12厘米,宽为8厘米的长方形纸片制作一个无盖的长方体纸盒.三位同学分别以下列方式在长方形纸片上截去两角(图中阴影部分),然后沿虚线折成一个无盖的长方体纸盒.甲:如图1,盒子底面的四边形ABCD是正方形;乙:如图2,盒子底面的四边形ABCD是正方形;丙:如图3,盒子底面的四边形ABCD是长方形,AB=2AD.将这三位同学所折成的无盖长方体的容积按从大到小的顺序排列,正确的是()A.甲>乙>丙B.甲>丙>乙C.丙>甲>乙D.丙>乙>甲二.填空题11.若要使如图中的平面展开图折叠成正方体后,相对面上的两个数为相反数,则2xy =.12.如图,有一个盛有水的正方体玻璃容器,从内部量得它的棱长为30cm,容器内的水深为8cm,现把一块长,宽,高分别为15cm,10cm,10cm的长方体实心铁块平放进玻璃容器中,容器内的水将升高cm.13.在一次数学活动课上,王老师给学生发了一张长30cm,宽20cm的长方形纸片(如图),要求折成一个高为5cm的无盖的且容积最大的长方体盒子,则该盒子的容积是.14.按照如图的平面展开图折叠成正方体后,相对面上的两个数都是互为相反数,那么a×b×c=.15.两个圆柱体容器如图所示,它们的半径分别为4cm和8cm,高分别为39cm和10cm.先在第一个容器中倒满水,然后将其倒入第二个容器中,若设倒完以后,第二个容器的水面离容器口有xcm,则可列方程为:39×42π=×82π.三.解答题16.计算下列长方体表面积.(单位:厘米)17.在七年级第一章的学习中,我们已经学习过:点动成,线动成,动成体.比如:(1)圆规在纸上划过会留下一个封闭的痕迹,这种现象说明.(2)一个人手里拿着一个绑在一根棍上的半圆面,当这个人把这个半圆面绕着这根棍飞快地旋转起来时就会看到一个球,这种现象说明.(3)聪明的你一定观察过生活中还有许多类似的现象,你能举出一个例子吗?并解释该现象.18.如图、把一个圆分成四个扇形,求出四个扇形的圆心角(按照从大到小排序).19.小明将一个底面为正方形,高为n的无盖纸盒展开,如图(a)所示.(1)请你计算图(a)所示的无盖纸盒的表面展开图的面积S1;(2)将阴影部分剪拼成一个长方形,如图(b)所示,请你计算该长方形的面积S2.(3)比较(1)(2)的结果,你得出什么结论?参考答案与试题解析一.选择题1.【解答】解:∵正方体的表面展开图,相对的面之间一定相隔一个正方形,∴做成一个无盖的盒子,盒子的底面的字母是B,周围四个字母分别是AECD,故选:C.2.【解答】解:观察图形可知,这个几何体是三棱锥.故选:D.3.【解答】解:第1个图是三棱锥;第2个图是三棱柱;第3个图是四棱锥;第4个图是三棱柱.∴是棱锥的有2个.故选:B.4.【解答】解:将直角三角形ABC绕斜边AB所在直线旋转一周得到的几何体是,故选:B.5.【解答】解:∵50个同样大小的立方体木块堆砌成如图所示的形状,现在从前、后、左、右和上面五个方向朝这堆木块喷漆,∴从下面数第1层有12个立方体木块会喷到漆,从下数第2层有12个立方体木块都喷到漆,从下面数第3层有12个立方体木块都会喷到漆,从下数第4层有7个立方体木块都会喷到漆.∴一点儿漆都喷不到的木块个数是:50﹣(12+12+12+7)=7(块).故选:B.6.【解答】解:由展开图可知:A、B、C能围成正方体,不符合题意;D、是“田”字形,围成几何体时,有两个面重合,故不能围成正方体,符合题意.故选:D.7.【解答】解:正方体的表面展开图,相对的面之间一定相隔一个正方形,“祝”与“年”是相对面,“你”与“快”是相对面,“新”与“乐”是相对面.故选:B.8.【解答】解:棱柱的两个底面展开后在侧面展开图相对的两边上,所以A、D选项错误;当底面为三角形时,则棱柱有三个侧面,所以B选项错误,C选项正确.故选:C.9.【解答】解:矩形绕边旋转是圆柱.故选:D.10.【解答】解:甲所折成的无盖长方体的容积为:5×3×3=45(cm3),乙所折成的无盖长方体的容积为:10×2×2=40(cm3),丙所折成的无盖长方体的容积为:6×4×2=48(cm3),∴丙>甲>乙.故选:C.二.填空题(共5小题)11.【解答】解:根据正方体表面展开图“相间、Z端是对面”可知,“1”与“x”相对,“3”与“y”相对,所以x=﹣1,y=﹣3,故2xy=2×(﹣1)(﹣3)=6,故答案为:6.12.【解答】解:设容器内的水将升xcm,根据题意得30×30×8+15×10×(8+x)=30×30×(8+x)或30×30×8+10×10×(8+x)=30×30×(8+x),解得x=1.6或x=1,即容器内的水将升1.6cm或1cm.故答案为:1.6或113.【解答】解:如图所示,该盒子的容积为(30﹣10)×(20﹣10)×5=1000(cm3).故答案为:1000cm314.【解答】解:这是一个正方体的平面展开图,共有六个面,其中面“a”与面“2”相对,面“c”与面“﹣1”相对,“3”与面“b”相对,∵相对面上的两个数都互为相反数,∴a=﹣2,b=﹣3,c=1,则a×b×c=﹣2×(﹣3)×1=6.故答案为:6.15.【解答】解:第一个容器中水的体积为39×42π;第二个容器中水的体积为(10﹣x)×82π,∵水的体积不变,∴39×42π=(10﹣x)×82π,故答案为:(10﹣x).三.解答题(共4小题)16.【解答】解:(6×4+6×2+4×2)×2=88(平方厘米),答:该长方体的表面积为88平方厘米.17.【解答】解:(1)故答案为:线,面,面;(2)由点、线、面、体的关系得,点动成线,故答案为:点动成线;(3)由点、线、面、体的关系得,面动成体,故答案为:面动成体;(4)例如:彗星从天空中划过一道明亮的弧线陨落,是点动成线的例子.18.【解答】解:因为一个圆周角为360°,所以分成的四个扇形的圆心角分别是:360°×40%=144°360°×25%=90°360°×20%=72°360°×15%=54°2=9m2﹣4n2;4.2 直线、射线、线段一、选择题1. 下列各说法一定成立的是( )A.画直线AB=10厘米B.已知A、B、C三点,过这三点画一条直线C.画射线OB=10厘米D.过直线AB外一点画一条直线和直线AB平行2. 如图,用圆规比较两条线段A′B′和AB的长短,其中正确的是( )A.A′B′>AB B.A′B′=ABC.A′B′<AB D.A′B′≤AB3. 如图,点C是线段BD之间的点,有下列结论:( )①图中共有5条线段;②射线BD和射线DB是同一条射线;③直线BC和直线BD是同一条直线;④射线AB,AC,AD的端点相同,其中正确的结论是()A.②④B.③④C.②③D.①③4. 工人师傅在给小明家安装晾衣架时,一般先在阳台天花板上选取两个点,然后再进行安装.这样做的数学原理是A.过一点有且只有一条直线B.两点之间,线段最短C.连接两点之间的线段叫两点间的距离D.两点确定一条直线5. 如图所示,不同的线段的条数是( )A.4条B.5条C.10条D.12条6. 射线OA与OB是同一条射线,画图正确的是( )A.B.C.D.7. 如果线段AB=5cm,BC=4cm,且A、B、C在同一条直线上,那么A、C两点的距离是( )A.1cm B.9cmC.1cm或9cm D.以上答案都不正确8. 下列选项中各有一条射线和一条线段,则它们能相交的是()9. 如图的图示中,直线表示方法正确的有()A.①②③④B.①②C.②④D.①④10. 已知点A,B,C为平面内三点,给出下列条件:①AC=BC;②AB=2BC;③AC=BC=AB.选择其中一个条件就能得到“点C是线段AB中点”的是()A.①B.③C.①或③D.①或②或③二、填空题11. 经过同一平面内的A,B,C三点中的任意两点,可以作出__________条直线.12. 如图,该图中不同的线段数共有__________条.13. 如图所示是一段火车路线图,A、B、C、D、E是五个火车站,在这条线路上往返行车需要印制种火车票.14. 如下图,从小华家去学校共有4条路,第__________条路最近,理由是__________.15. 如图,若D是AB中点,E是BC中点,若AC=8,EC=3,AD=__________.16. 如图,只用圆规,比较下列线段的大小(选填“>”“<”或“=”).(1)图①中,AB____CD,AD____AB,AD____BD;(2)图②中,MN____EF,EF____KE,GM____MN.三、解答题17. 如图,已知A、B、C、D四点,根据下列要求画图:(1)画直线AB、射线AD;(2)画∠CDB;(3)找一点P,使点P既在AC上又在BD上.18. 如图,B、C是线段AD上两点,且AB:BC:CD=3:2:5,E、F分别是AB、CD的中点,且EF=24,求线段AB、BC、CD的长.19. 如图所示,C是线段AB上的一点,D是AC的中点,E是BC的中点,如果AB=9cm,AC=5cm.求:(1)AD的长;(2)DE的长.20. 如图,已知A,B,C,D四个点:(1)画直线AB,CD相交于点P;(2)连接AC和BD并延长AC和BD相交于点Q;(3)连接AD,BC相交于点O;(4)以点C为端点的射线有几条?请列举出来;(5)以点C为一个端点的线段有几条?请列举出来.21. 如图,设A,B,C,D为4个居民小区,现要在四边形ABCD内建一个购物中心,试问应把购物中心建在何处,才能使4个居民小区到购物中心的距离之和最小?请说明理由.22. 如图所示,已知C、D是线段AB上的两个点,点M、N分别为AC、BD的中点.(1)若AB=16cm,CD=6cm,求AC+BD的长和M,N的距离;(2)如果AB=m,CD=n,用含m,n的式子表示MN的长.23. 如图所示,把一根细线绳对折成两条重合的线段AB,点P在线段AB上,且AP:BP=2:3.(1)若细线绳的长度是100cm,求图中线段AP的长;(2)从点P处把细线绳剪断后展开,细线绳变成三段,若三段中最长的一段为60cm,求原来细线绳的长.参考答案一、选择题1. 下列各说法一定成立的是( )A.画直线AB=10厘米B.已知A、B、C三点,过这三点画一条直线C.画射线OB=10厘米D.过直线AB外一点画一条直线和直线AB平行【答案】 D2. 如图,用圆规比较两条线段A′B′和AB的长短,其中正确的是( )A.A′B′>AB B.A′B′=ABC.A′B′<AB D.A′B′≤AB【答案】 A3. 如图,点C是线段BD之间的点,有下列结论:( )①图中共有5条线段;②射线BD和射线DB是同一条射线;③直线BC和直线BD是同一条直线;④射线AB,AC,AD的端点相同,其中正确的结论是()A.②④B.③④C.②③D.①③【答案】B【解析】①图中共有6条线段,错误;②射线BD和射线DB不是同一条射线,错误;③直线BC和直线BD是同一条直线,正确;④射线AB,AC,AD的端点相同,正确.故选B.4. 工人师傅在给小明家安装晾衣架时,一般先在阳台天花板上选取两个点,然后再进行安装.这样做的数学原理是( )A.过一点有且只有一条直线B.两点之间,线段最短C.连接两点之间的线段叫两点间的距离D.两点确定一条直线【答案】 D5. 如图所示,不同的线段的条数是( )A.4条B.5条C.10条D.12条【答案】 C6. 射线OA与OB是同一条射线,画图正确的是( )A.B.C.D.【答案】 B7. 如果线段AB=5cm,BC=4cm,且A、B、C在同一条直线上,那么A、C两点的距离是( )A.1cm B.9cmC.1cm或9cm D.以上答案都不正确【答案】 C8. 下列选项中各有一条射线和一条线段,则它们能相交的是()【答案】C【解析】射线可以向一方无限延伸.故选C.9. 如图的图示中,直线表示方法正确的有()A.①②③④B.①②C.②④D.①④【答案】D10. 已知点A,B,C为平面内三点,给出下列条件:①AC=BC;②AB=2BC;③AC=BC=AB.选择其中一个条件就能得到“点C是线段AB中点”的是()A.①B.③C.①或③D.①或②或③【答案】【解答】解:①点C在线段AB上,且AC=BC,则C是线段AB中点故①不符合题意;②AB=2BC,C不一定是线段AB中点故②不符合题意;③AC=BC=AB,则C是线段AB中点,故③符合题意.故选:B.二、填空题11. 经过同一平面内的A,B,C三点中的任意两点,可以作出__________条直线.【答案】1或312. 如图,该图中不同的线段数共有__________条.【答案】613. 如图所示是一段火车路线图,A、B、C、D、E是五个火车站,在这条线路上往返行车需要印制种火车票.【答案】【解答】解:图中线段有:AB、AC、AD、AE,BC、BD、BE,CD、CE、DE共10条,∵每条线段应印2种车票,∴共需印10×2=20种车票.故答案为:20.14. 如下图,从小华家去学校共有4条路,第__________条路最近,理由是__________.【答案】③;两点之间,线段最短15. 如图,若D是AB中点,E是BC中点,若AC=8,EC=3,AD=__________.【答案】116. 如图,只用圆规,比较下列线段的大小(选填“>”“<”或“=”).(1)图①中,AB____CD,AD____AB,AD____BD;(2)图②中,MN____EF,EF____KE,GM____MN.【答案】(1)>,=,=(2)=,<,<三、解答题17. 如图,已知A、B、C、D四点,根据下列要求画图:(1)画直线AB、射线AD;(2)画∠CDB;(3)找一点P,使点P既在AC上又在BD上.【答案】解:如图所示.18. 如图,B、C是线段AD上两点,且AB:BC:CD=3:2:5,E、F分别是AB、CD的中点,且EF=24,求线段AB、BC、CD的长.【答案】【解析】设AB=3x,则BC=2x,CD=5x,因为E、F分别是AB、CD的中点,所以BE=32x,CF=52x,因为BE+BC+CF=EF,且EF=24,所以32x+2x+52x=24,解得x=4,所以AB=12,BC=8,CD=20.19. 如图所示,C是线段AB上的一点,D是AC的中点,E是BC的中点,如果AB=9cm,AC=5cm.求:(1)AD的长;(2)DE的长.【答案】【解析】(1)因为AC=5cm,D是AC中点,所以AD=DC=12AC=52cm,(2)因为AB=9cm,AC=5cm,所以BC=AB−AC=9−5=4(cm),因为E是BC中点,所以CE=12BC=2cm,所以DE=CD+CE=52+2=92(cm).20. 如图,已知A,B,C,D四个点:(1)画直线AB,CD相交于点P;(2)连接AC和BD并延长AC和BD相交于点Q;(3)连接AD,BC相交于点O;(4)以点C为端点的射线有几条?请列举出来;(5)以点C为一个端点的线段有几条?请列举出来.【答案】解:(1),(2),(3)如答图;(4)以点C为端点的射线有3条,分别是射线CP,射线CD,射线CQ;(5)以点C为一个端点的线段有6条,分别是线段CP,线段CD,线段CA,线段CQ,线段CO,线段CB.21. 如图,设A,B,C,D为4个居民小区,现要在四边形ABCD内建一个购物中心,试问应把购物中心建在何处,才能使4个居民小区到购物中心的距离之和最小?请说明理由.【答案】解:如答图,应建在AC,BD连线的交点处.理由:根据两点之间线段最短,将A,C,B,D用线段连起来,路程最短,两线段的交点处建超市可使4个居民小区到购物中心的距离之和最小.22. 如图所示,已知C、D是线段AB上的两个点,点M、N分别为AC、BD的中点.(1)若AB=16cm,CD=6cm,求AC+BD的长和M,N的距离;(2)如果AB=m,CD=n,用含m,n的式子表示MN的长.【答案】【解答】解:(1)∵AB=16cm,CD=6cm,∴AC+BD=AB﹣CD=10cm,∴MN=AB﹣(AM+BN)=AB﹣(AC+BD)=16﹣5=11(cm);(2)∵AB=m,CD=n,∴AC+BD=AB﹣CD=m﹣n,∴MN=AB﹣(AM+BN)=AB﹣(AC+BD)=m﹣(m﹣n)=.23. 如图所示,把一根细线绳对折成两条重合的线段AB,点P在线段AB上,且AP:BP=2:3.(1)若细线绳的长度是100cm,求图中线段AP的长;(2)从点P处把细线绳剪断后展开,细线绳变成三段,若三段中最长的一段为60cm,求原来细线绳的长.【答案】【解答】解:(1)∵AB=100=50,AP:BP=2:3,∴AP=20;(2)∵AP:BP=2:3,∴设AP=2x,BP=3x,若一根绳子沿B点对折成线段AB,则剪断后的三段绳子中分别为2x,2x,6x,∴6x=60,解得x=10,∴绳子的原长=2x+2x+6x=10x=100(cm);若一根绳子沿A点对折成线段AB,则剪断后的三段绳子中分别为4x,3x,3x,∴4x=60,解得x=15,∴绳子的原长=4x+3x+3x=10x=150(cm);综上所述,绳子的原长为100cm或150cm.故答案为100cm或150cm.4.3角一.选择题1.如图,∠AOC=90°,OC平分∠DOB,且∠DOC=22°36′,∠BOA度数是()A.67°64′B.57°64′C.67°24′D.68°24′2.如图,∠BOD=118°,∠COD是直角,OC平分∠AOB,则∠AOB的度数是()A.48°B.56°C.60°D.32°3.如图,已知∠AOB:∠BOC=2:3,∠AOC=75°,那么∠AOB=()A.20°B.30°C.35°D.45°4.如图∠AOB=60°,射线OC平分∠AOB,以OC为一边作∠COP=15°,则∠BOP=()A.15°B.45°C.15°或30°D.15°或45°5.如图,点O在直线AB上,OD是∠AOC的角平分线,∠COB=42°,则∠DOC的度数是()A.59°B.60°C.69°D.70°6.已知点O是直线AB上一点,∠AOC=50°,OD平分∠AOC,∠BOE=90°,下列结果,不正确的是()A.∠BOC=130°B.∠AOD=25°C.∠BOD=155°D.∠COE=45°7.如图,两个直角∠AOC和∠BOD有公共顶点O,下列结论:①∠AOB=∠COD;②∠AOB+∠COD=90°;③若OB平分∠AOC,则OC平分∠BOD;④∠AOD的平分线与∠BOC的平分线是同一条射线.其中结论正确的个数是()A.4个B.3个C.2个D.1个8.将两块相同的直角三角板的顶点重合(如图所示),则∠1与∠2的大小关系是()A.∠1>∠2B.∠1<∠2C.∠1=∠2D.以上答案都有可能9.如图,O是直线AB上的一点,∠AOD=120°,∠AOC=90°,OE平分∠BOD,则图中∠COE的大小是()A.30°B.45°C.60°D.75°10.借助一副三角尺,你能画出下面那个度数的角()A.65°B.75°C.80°D.95°二.解答题11.如图所示,已知BC是从直线AB上出发的一条射线,BE平分∠ABC,∠EBF=90°.求证:BF平分∠CBD.12.如图,已知,O是直线AB上一点,∠AOE=∠COD,射线OC平分∠BOE,∠EOC=50°.求∠DOE的度数.13.如图,点A、O、B在一条直线上,OD平分∠COA,OE平分∠BOC,∠BOF=2∠COF,∠EOF=22°.(1)求∠DOE的度数;(2)求∠FOC的度数.14.如图,∠AOB=140°,OC平分∠DOB,∠AOD:∠COD=1:2,求∠COB的度数.15.如图,已知∠AOB=40°,∠BOC=3∠AOB,OD平分∠AOC,求∠COD的度数.解:∵∠BOC=3∠,∠AOB=40°,∴∠BOC=°∴∠AOC=+∴∠AOC=160°∵OD平分∠AOC∴∠COD==°.参考答案一.选择题1.∵OC平分∠DOB,∴∠DOC=∠BOC=22°36′.∵∠AOC=∠AOB+∠BOC=90°,∴∠AOB=∠AOC﹣∠BOC=90°﹣22°36′=67°24′.故选:C.2.∵OC平分∠AOB,∴∠AOB=2∠AOC=2∠BOC,∵∠COD是直角,∴∠COD=90°,∵∠BOD=118°,∴∠BOC=∠BOD﹣∠COD=118°﹣90°=28°,∴∠AOB=2∠BOC=56°.故选:B.3.∵∠AOB:∠BOC=2:3,∠AOC=75°,∴∠AOB=∠AOC=×75°=30°,故选:B.4.∵∠AOB=60°,射线OC平分∠AOB,∴∠AOC=∠BOC=AOB=30°,又∠COP=15°①当OP在∠BOC内,∠BOP=∠BOC﹣∠COP=30°﹣15°=15°,②当OP在∠AOC内,∠BOP=∠BOC+∠COP=30°+15°=45°,综上所述:∠BOP=15°或45°.故选:D.5.∵∠COB=42°,∴∠AOC=180°﹣∠COB=138°,∵OD是∠AOC的角平分线,∴∠DOC===69°.故选:C.6.∵∠AOC=50°,∴∠BOC=180°﹣∠AOC=130°,A选项正确;∵OD平分∠AOC,∴∠AOD=∠AOC=×50°=25°,B选项正确;∴∠BOD=180°﹣∠AOD=155°,C选项正确;∵∠BOE=90°,∠AOC=50°,∴∠COE=180°﹣∠AOC﹣∠BOE=40°,故D选项错误;故选:D.7.①∵∠AOC=∠BOD=90°,∴∠AOB+∠BOC=∠BOC+∠COD=90°,∴∠AOB=∠COD;②∠AOB+∠COD=90°不一定和是90°;③若OB平分∠AOC,则∠AOB=∠BOC=45°,∴∠COD=45°,∴OC平分∠BOD;④∵∠AOB=∠COD,∴∠BOE=∠COE,∴∠AOE=∠DOE,∴∠AOD的平分线与∠BOC的平分线是同一条射线.∴①③④正确,故选:B.8.∵∠1+∠BOC=∠AOC=90°,∠2+∠BOC=∠BOD=90°,∴∠1=∠2,故选:C.9.∠BOD=180°﹣∠AOD=60°,∵OE平分∠BOD,∴∠DOE==30°,∴∠COE=90°﹣∠DOE=60°.故选:C.10.用一幅三角尺可以直接画出的角的度数有:30°、45°、60°、90°.A:65度的角不能用一副三角尺画出.B:因为75度=45度+30度,所以75度的角能用一副三角尺画出.C:80的角不能用一副三角尺画出.D:95度的角不能用一副三角尺画出.故选:B.二.解答题11.证明:∵BE平分∠ABC,∴∠CBE=∠ABE,∵∠EBF=90°,∴∠CBF=90°﹣∠CBE,∴∠DBF=180°﹣90°﹣∠ABE=90°﹣∠CBE=∠CBF.即BF平分∠CBD.12.∵∠AOE=∠COD∴∠AOE﹣∠DOE=∠COD﹣∠DOE,即∠AOD=∠EOC=50°∵射线OC平分∠BOE,∴∠EOE=∠COB=50°∴∠DOE=180°﹣3×50°=30°.13.(1)∵OD平分∠COA,OE平分∠BOC,∴,,∴;(2)设∠FOC=x,∵OE平分∠BOC,∠BOF=2∠COF,∴2x﹣22°=x+22°,解得x=44°.14.∵OC平分∠DOB,∴∠COB=∠COD,∵∠AOD:∠COD=1:2,∴∠AOD:∠COD:∠COB=1:2:2,∵∠AOD+∠COD+∠COB=∠AOB=140°,∴5∠AOD=140°,解得∠AOD=28°,∴∠COB=2∠AOD=56°.15.∵∠BOC=3∠AOB,∠AOB=40°,∴∠BOC=120°,∴∠AOC=∠AOB+∠BOC∴∠AOC=160°∵OD平分∠AOC∴∠COD=∠AOC=80°.故答案为AOB;120;∠AOB,∠BOC;∠AOC,80°.。
基础训练七年级上期答案
基础训练七年级上期答案与人教版义务教育课程标准实验教科书配套基础训练(含单元评价卷)数学七年级上册参考答案课时练习部分参考答案第三章一元一次方程3.1 从算式到方程3.1.1 一元一次方程第1课时1.②③ 2.直接 3.x=1 4.②④⑤⑥⑧ 5.D 6.x+3 11x+3 7.C8.(1)x-45x=10 (2)3x-4=6 (3)5x=x+15 (4)2x-70%x=59.D 10.B 11.C 12.D13. 13-13y=1 14.x4-x5=1615. 600×0.8-x=20%x16.x+5(12-x)=4817.(1)a+23=a-3 (2)40%x+6=-13x第2课时1.①②⑤ 2.x=3 3. 2x-3=124.C 5.A 6.A 7.③⑤8. 09.C 10.D 11.D 12.C 13. 7x=6.5x+514.设甲原有x元,则x-40=240-x+40.15.(1)6x-11=5 (2)3(y-2)-5=216.设x年后妈妈的年龄是这位同学年龄的2倍,则2(12+x)=39+x.17.(1)(1+20%)x;2(x-10).(2)(1+20%)x=2(x-10).(3)检验知:乙班、甲班植树的株数分别是25和30.3.1.2 等式的性质1.(1)-4 (2)2x (3)-2 (4)y 2. 53.-10 4.C 5.D 6.D 7.C 8. 29.-6 等式的性质:等式两边加(或减)同一个数(或式子),结果仍相等10.m =n 11.乘-3 -6 12. 2 3 2413.(1)2x -3=0,2x =3,x =32 (2)13x -3=x ,13x -x =3,-23x =3,x =-9214.(1)8x -3=3-x ,8x -3+x +3=3-x +x +3,9x =6,x =23 (2)32x +1=7,32x +1-1=7-1,32x =6,x =4 15.①②③④16.等式的性质1:等式两边加(或减)同一个数(或式子),结果仍相等 等式两边同时除以a ,但未讨论a 是否为017.因为ax -b -4x =8,所以ax -b =4x +8.因为无论x 取何值,上式永远成立,所以a =4,b =-8.3.2 解一元一次方程(一)——合并同类项与移项第1课时1. 2ab 与12ba2.-x -12y 0 3.(1)6ab (2)12m (3)4x 4.A 5.x =1 6. 8x =8 1 7. 6008.(1)y =4 (2)x =2 9. 16 10.-9 11.D 12.D13. (1)x =-24 (2)y =4 14.x =3 15.x =916.设硫磺需2x 千克,则2x +3x +5x =150.解得x =15,所以2x =30,3x =45,5x =75.答:需要硫磺30千克,木炭45千克,火硝75千克.17.(1)设小亮拿到的5张卡片中间的数为x ,则(x -4)+(x -2)+x +(x +2)+(x +4)=40.解得x =8,所以这5张卡片上的数分别是4,6,8,10,12.(2)若5x =81,解得x =815,所以数字之和不可以为81.若5x =100,解得x =20,所以数字之和可以为100.第2课时1.移项 变号 等式的性质1 2.(1)4x -3x (2)-1.4-13.B 4. 3x +2=4x -5 5. 12x -32x =4 -x =4 x =-4 6.A 7.B 8.(1)4x -3=5+2x ,4x -2x =5+3,2x =8,x =4 (2)1+32y =12y -52,32y -12y =-52-1,y =-729.C 10.A 11.D 12.C 13. 35 cm 、65 cm14.(1)x =-7 (2)x =615.设该班共有x 名学生,则3x +24=4x -26.解得x =50.所以3x +24=174.答:这个班共有50名学生,共展出174张邮票.16.设到x 米处乙追上甲,则x 6.5=x -7×105+10.解得x =2603.因为2603<100,所以乙能在到达100米终点前追上甲.第3课时1. (1)a =-2 (2)y =-52. 213. 214. 5x +3=7x -5 45.-1136.B7. 18. 39.日 10.B 11.C12.设该校有x 间宿舍,则x +10=3(x -10).解得x =20,所以x +10=30.答:有20间宿舍,共有30人住.13.设甲池原有水x 吨,则乙池有(40-x )吨.根据题意,得x +4=40-x -8.解得x =14,所以40-x =26.答:甲池原有水14吨,乙池原有水26吨.14.设初中部原计划赠书x 册,则x ·(1+20%)+(3000-x )·(1+30%)=3780.解得x =1200,所以3000-x =1800.所以初中部原计划赠书1200册,高中部原计划赠书1800册.3.3 解一元一次方程(二)——去括号与去分母第1课时1.a +b -c +d 2a +10b -15c 2.x =-65x =-5 3. 3(26+x )=3.5(26-x ) 4.D 5.B 6. -17. 27+x =2(19+20-x ) 27+20-y =2(19+y )8.(1)x =12 (2)x =-129.B 10. 3.25% 11. 100(x +3)=150(x -3) 12. 10213. 10(15-x )+x =10x +15-x +2714.(1)x =193 (2)x =1130(3)y =2 (4)x =1 15.中型汽车15辆,小型汽车35辆.第2课时1.x =1 2.-5 3.x =-2 4.D 5.A 6.-135 7. 3 8.(1)x =-9 (2)x =413 (3)y =7 (4)x =16 9.①⑤ x =314 10.① 11.-5612.(1)x =-7 (2)x =719 (3)x =-928(4)x =7 13.y =-10 14.a =5 x =11 15.略第3课时1.x =1 2.x =2 3. 4.8 4.A 5. 13 6.23p 7. 27 120 8.C 9.D10.设一台彩电的售价为x 元,根据题意,得13%×(x +x -1000)=390.解得x =2000.所以2000-1000=1000(元).所以彩电和洗衣机的售价分别是2000元和1000元.11.设这批服装的订货任务是x 套,则x -10020=x +2023.解得x =900.所以这批服装的订货任务是900套.12.设试管中水的高度下降了h 厘米,则π×⎝ ⎛⎭⎪⎫322×h =π×⎝ ⎛⎭⎪⎫822×1.8.解得x =12.8.所以试管中水的高度下降了12.8厘米.13.设停电x 小时后,粗蜡烛的高度是细蜡烛高度的2倍,则1-14x =2⎝ ⎛⎭⎪⎫1-13x .解得x =125.所以停电125小时. 14.设遗产总数为x 克朗,则老大分得110x +90,老二分得200+110⎣⎢⎡⎦⎥⎤x -200-⎝ ⎛⎭⎪⎫110x +90=171+9100x .由所有的孩子分得遗产相等,得110x +90=171+9100x .解得x =8100,所以x 10+90=900,8100900=9.答:遗产总数为8100克朗,共9个孩子,每个孩子分得遗产900克朗.3.4 实际问题与一元一次方程第1课时1. 362.a n 1mn3. A4. 17 35. 32 6.设x 人挖土,则(24-x)人运土.根据题意,得5x =3(24-x).解这个方程,得x =9.所以24-x =15.故应安排9人挖土、15人运土,才能恰好使挖出的土被及时运走.7.设原计划要生产x 件产品,则x 60-x +4860×(1+20%)=5.解得x =2040.所以原计划要生产2040件产品.8.设这批机器有x 台,则23x 4+13x 4×32+1=x 4.解得x =36,所以x 4=9.所以这批机器有36台,预计9天完成.9.设安排x 名工人生产桌面,则4×12x=60(36-x).解得x =20,所以36-20=16,因此应该安排20名工人生产桌面,16名工人生产桌腿.10.设应用x 米布料生产上衣,则用(600-x)米布料生产裤子.依题意可知:生产1件上衣需32米布料,生产1条裤子需1米布料.则x 32=600-x 1.解得x=360.所以600-360=240(米).所以应分别用360米布料生产上衣,240米布料生产裤子才能恰好配套,共能生产240套学生服.11.设养鸡场的宽为x 米,则按他爸爸的设计,其长应为(x +5)米.依题意,得2x +(x +5)=35.解得x =10,而10+5=15>14.按他妈妈的设计,其长应为(x +2)米,则2x +(x +2)=35.解得x =11,而11+2=13<14.所以他妈妈的设计符合实际,这时养鸡场的面积为13×11=143(平方米).第2课时1.B 2.D 3. 0.8a 25 4.C5.A 6.B 7.D 8.C 9. 28 10. 2250 11. 3∶212.设每支铅笔的原价为x 元,则50×0.8x +6=50x.解得x =0.6.13.设每套服装的进价为x 元,则30(x +40)+10[60%(x +40)]=4320.解得x =80,40×80=3200<4320,该个体户赚了.14.(1)设在启动活动前的一个月,销售给农户的Ⅰ型冰箱为x 台,则1.3x +1.25(960-x)=1228.解得x =560,所以960-560=400(台).答:销售给农户的Ⅰ型冰箱和Ⅱ型冰箱分别为560台和400台.(2)(2298×560×1.3+1999×400×1.25)×13%=347417.72(元).答:政府共补帖了347417.72元.第3课时1.B 2.A 3.C 4. 45.设十位上的数字为x ,则100(x +1)+10x +3x -2+100(3x -2)+10x +x +1=1171.解得x =3.所以这个三位数是437.6.设小颖洗了x 张照片,则(3+0.5x)×80%=16.8.解得x =36.所以小颖洗了36张照片.7.A 8. 5 9. 7210.由表中数据可知,答对一题得5分,答错一题还要扣掉1分.假设该同学答对了x 道,则5x +(20-x)×(-1)=70.解得x =15. (2)当6x -20=86时,x =1723.当6x -20=72时,x =1513.所以同学H 、G 说得均不对. 11.(1)若乙团人数不超过50人,则两团共计最多付票款100×13=1300(元).因为1300<1392,所以乙团人数一定超过50人. (2)因为108011不是整数,所以两团人数的和一定超过100人.设甲团有x 人,由题意,得13x +11×⎝ ⎛⎭⎪⎫10809-x =1392.解得x =36,所以10809-x =84.所以甲团有36人,乙团有84人.12.设此人住院的医疗费是x 元,显然x 在1000~3000,由题意,得(1000-500)×60%+(x -1000)×80%=1100,解得x =2000.所以此人住院的医疗费是2000元.13.(1)应选择绕道去学校. (2)设维持秩序的时间是x 分钟,则363-⎝⎛⎭⎪⎫x +36-3x 9=6.解得x =3.所以维持秩序的时间是3分钟.第4课时1.B 2.(1)4x (2)15 3x (3)3.75 (4)甲 乙3. 4004. 85. 106.(1)设买标价为x 元的书,则20+0.8x =x.解得x =100.所以,当买标价为100元的书时,办会员卡与不办会员卡付一样的钱. (2)当买标价为70元的书时,办会员卡后需付费20+70×0.8=76(元).因为76>70,所以不办会员卡合算. (3)当买标价为200元的书时,办会员卡后需付费20+200×0.8=180(元).因为180<200,所以办会员卡合算.7.甲种存5万元,乙种存15万元.8.有两种方案:方案一:购进A 型电脑3台和C 型电脑33台;方案二:购进B 型电脑7台和C 型电脑29台.理由略.9.(1)设书包的单价为x 元,则x +4x -8=452,解得x =92,所以4x -8=360.答:MP 3和书包的单价分别为360元和92元. (2)在超市A 应付的钱数为452×75%=339<400,在超市B 应付的钱数是360-3×30+92=362<400,所以两家超市都可以选择,在超市A 购买更合算.10.设当公司租车行驶每月x 千米时花费一样多,则1210+0.1x =1.20x.解得x =1100.答:当行驶里程少于1100千米时乙公司合算;当行驶里程为1100千米时一样;当行驶里程超过1100千米时甲公司合算.11.设张舒住处到车站共x 千米(2≤x<4),根据题意,得5+1.5×(x-2)=7.25,解得x =3.5.若乘坐原车返回,来回路程为3.5×2=7(千米),所花费用为5+2×1.5+(7-4)×2=14(元).若重新换乘出租车则还需7.25元,来回共14.5元.14.5-14=0.5(元),因此乘原出租车回去省钱,省了0.5元.12.(1)因为200×90%=180(元)>134(元),所以134元的物品未优惠.又因为500×910=450(元)<466(元),所以466元的物品有两次优惠.设其售价为x 元,则500×910+(x -500)×810=466.解得x =520.故物品不打折时分别值134元和520元. (2)节省了134+520-134-466=54(元). (3)更合算.654元的物品优惠价为:500×910+(654-500)×810=573.2(元),故节省134+466-573.2=26.8(元),所以若合起来一次购物,则更合算,节省了26.8元.第三章复习课第1课时1.-2 -142.②3. 4,5,6,7 4.C 5.D 6.C7.B8.(1)x=15(2)x=4 (3)x=-9 (4)x=59. 8 10.-7 11. 15岁37岁12.C13.A14.B15.D16.(1)x=74(2)x=12(3)x=16(4)x=-9.2第2课时1.B 2.D 3. 1.2x 4. 44x+64=328 5. 32+x=2(28-x)6.设还需x天完成,则310+x+315+x12=1.解得x=103.7.(1)设刻录x张光盘时,两者费用一样,则8x=120+4x.解得x=30. (2)当x>30时,学校自己刻录合算.8.D9.B10.D11. 450x=9000(1-30%) 12. 8.513.设七年级(2)班有x人,则5(x+6)+6x=492.解得x=42,42+6=48.14.设安排x人加工甲种部件,则16x2=10(85-x)3.解得x=25,85-25=60.15.(1)设租用60座客车x辆,则45(x+1)=60x-15.解得x=4,45×5=225.答:参加旅游的有225人.(2)租用45座客车1辆,60座客车3辆,最合算.16.(1)设侧门每分钟通过x名学生,则2x+2(x+40)=400.解得x=80,所以80+40=120.答:侧门每分钟可通过80名学生,正门可通过120名学生.(2)(80+2×120)×5×0.8=1280,4×6×45=1080,1280>1080.所以符合要求.17.方案一获利:140×4500=630000(元);方案二获利:15×6×7500+(140-15×6)×1000=725000(元);方案三:设精加工x天,则6x+16(15-x)=140.解得x=10,获利6×10×7500+16×5×4500=810000(元).所以方案三获利最多.。
七年级新目标人教版2012教材英语基础训练(1)
七年级新目标人教版2012教材英语基础训练(一)一、单项选择:1. —What’s this in English? —It’s ____ orange.A. aB. anC. theD. 不填2. Five and three is ____.A. sixB. sevenC. eightD. nine3. —What color is ____ ruler? —Red.A. yourB. IC. youD. it4. ____ her name?A. WhatB. HowC. How isD. What’s5. —Nice to meet you! —____A. I’m fine, thanks.B. Nice to meet you, too!C. Hello!D. Good morning!6. —What’s his name?—____.A. It’s a penB. My name is JackC. His name is JimD. He is fine7. I’m Cindy Jones. Jones is my ___.A. first nameB. last nameC. nameD. full name8. —What’s your telephone number?—______ 625 - 7886.A. It’sB. I’mC. She’sD. He’s9. —______ these her hats? —No, they_____.A. Is; isn’tB. Am; areC. Are; isn’tD. Are; aren’t10. —Is this your ruler? —____.A. YesB. No, they aren’tC. SorryD. Yes, they are11. Is that your aunt? What’ s_____ name?A. hisB. herC. sheD. hers12. — Is that her notebook? —No, ____ isn’t.A. itB. thatC. itsD. it’s13. —_____ ? —The girl under the tree? I don’t know.A. What’s thatB. What’s the girlC. Who’s thatD. Whose is she14. —Is it his pen? —_______A. It is his pen.B. It isn’t his pen.C. Yes, it isn’t.D. No, it isn’t.15. —What’s this in English?—____.A. It’s my ring.B. Yes, it’s a ring.C. It’s a ring.D. That is a ring.16. Here is _____.A. two rulersB. a rulersC. two rulerD. a ruler17. —Dad, this is my pen friend, Alan. —_______.A. Thank yonB. OKC. Nice to meet youD. Good18. My mother’s sister is my ____.A. grandmotherB. SistersC. cousinD. Aunt二、完形填空:(一)I’m a boy. My 1 is Tom Green. 2 is my last name. What’s 3 in English? It’s a pen. It is 4 pen. It is blue. I like it very much. This is my jacket. It is very big. It is in a size 5 . This is my sister. 6 name is Linda. She 7 seven years old. I have a 8 . Its number is 654-3795. There are(有) 9 people in my family. It is a happy 10 . My parents love us. We love them, too.1. A. first B. English C. name D. last2. A. Green B. Tom Green C. Tom D. Greens3. A. it B. this C. you D. they4. A. your B. his C. her D. my5. A. S B. N C. L D. P6. A. Her B. She C. Its D. His7. A. am B. is C. are D. be8. A. pen B. ruler C. key D. phone9. A. one B. two C. three D. four10. A. family B. school C. map D. Book(二)Hello! I’m Mary Brown. I’m 1 English girl. Look! Here 2 a photo 3 my family. This is 4 sister. 5 name is Mona. 6 is in Class One, Grade Eight. 7 is my uncle. His 8 name is Bill. His 9 is Tony Brown. He is a student, too. Oh, Tony is my 10 .1. A. a B. an C. the D. /2. A. is B. am C. are D. be3. A. for B. in C. at D. of4. A. me B. you C. my D. she5. A. Your B. Her C. His D. Its6. A. She B. I C. He D. These7. A. Those B. This C. It D. These8. A. last B. first C. family D. these9. A. daughter B. sister C. mother D. son10. A. cousin B. aunt C. sister D. Uncle三、阅读理解:This is a Chinese boy. His name is Ling Fe ng. He’s thirteen. He is in No. 5 Middle School. He is in Class One, Grade Two. Ling Feng is in Row Four. He is Number 20. Miss Zhang is his English teacher. They love her very much.1. Ling Feng is a ____ boy.A. EnglishB. AmericanC. ChineseD. China2. He is in ____.A. row FourB. row 4C. Four RowD. Row Four3. ____ is his English teacher.A. Miss ZhangB. Mr. ZhangC. Mrs. ZhangD. Teacher Zhang4. He is in ____.A. Class 1, Grade 2B. class 1, grade 2C. Class 2, Grade 1D. Class 2, Grade 25. He is ____ years old.A. 30B. 12C. 13D. 11四、用括号中所给单词的正确形式填空:1. Nice ____ (meet) you.2. ____ (I) answer is right.3. ____ (be) you Number Three?4. Mary is ____ (he) sister.5. She is my friend. ____ (she) name is Lily.6. ____ (his) is a Chinese boy.7. The jackets ____ (be) green.8. What’s ____ (you) last name?9. —How are you? —Fine, ____ (thank).10.I ____ (be) a girl.11. These are our_____ (friend).12. Who______ (be) these girls?13. Ask that woman. I think it’s_____ (she) bike.14. ____ (you) books are in the backpack.15. ____ (that) two boys are David and Bill.16.—Are ____ (this) girls his cousins? —Yes, they are.17. These are my ____ (grandparent).18. Anna and I ____ (be) friends.19. I have two ____ (picture) of Sichuan.20. I ____ (be) your new friend.五、句型转换,每空一词1. He is Jack. (同义句转换) ____ ____ is Jack.2. My name is Amy. (对画线部分提问) ____ ____name?3. is, color, that, what, phone (连词成句) _____ _____ _____ _____ _____?4. His first name is Nick (对画线部分提问) ____ his ____ name?5. His name is Eric. (用缩写形式改写) ____ ____ Eric.6. This is my aunt.(改为一般疑问句) _____ this _____ aunt?7.Is Li Qiang your brother? (作否定回答) _____, he_____.8. That is Emma’s uncle. (改为复数句) _____ _____ Emma’s uncles.9. This is his pencil.(对划线部分提问) _____ _____?10. These are her sisters. (改为单数句) _____ is her _____.Ⅵ. 根据汉语提示完成下列英语句子,每空一词1. 请给辛蒂打电话。
人教部编版七年级上册语文基础训练(1—3单元)
部编版七年级上册基础训练基础训练(一)一、积累与运用(30分)1.下列词语中加点字注音完全正确的一组是( D )(3分)A.酝酿.(liáng)黄晕.(yùn)发髻.(jì) 碣.石(jié)B.棱.镜(líng) 粗犷.(guǎng)嘹.亮(liáo) 贮.蓄(zhù)C.卖弄.(lòng) 池畦.(qí)莅.临(lì) 草垛.(duǒ)D.花苞.(bāo) 竦.峙(sǒng)窠巢.(cháo) 静谧.(mì)(解析:A项“酝酿”的“酿”读作“niànɡ”,B项“棱镜”的“棱”读作“léng”,“卖弄”的“弄”读作“nònɡ”,“草垛”的“垛”读作“duò”。
)2.找出句中错别字并改正。
(3分)(1)鸟儿将窠巢安在繁花嫩叶当中,高兴起来了,呼朋引伴地卖弄轻脆的喉咙,唱出宛转的曲子。
(轻—清)(2)乡下去,小路上,石桥边,撑起伞慢慢走着的人;还有地里工作的农夫,披着蓑,带着笠的。
(带—戴)(3)看,像牛毛,像花针,像细丝,密密地斜织着,人家屋顶上全茏着一层薄烟。
(茏—笼)3.下列句中加点成语使用不当的一句是( C )(3分)A.森林公园里到处都是呼朋引伴....的游人。
B.他说话这样的不客气,真有点咄咄逼人....C.夏天的雨总是淅淅沥沥....下一阵,让人觉得酣畅极了。
D.墙边一排一排的板凳上,坐着花枝招展....的女人,笑语盈盈而不休。
4.下列句子中没有语病的一项是( C )(3分)A.千百年来的先贤哲人们给我们留下了灿烂辉煌的许多精神财富。
B.据介绍,这次公车改革将涉及近5000多辆中央国家机关本级公车。
C.亚航QZ8501客机失事,再次引发了人们对马航MH370失联航班的追忆。
D.一些家长没有意识到“手机综合症”是一种病,而是采用简单粗暴的方式防止孩子不玩手机。
七年级上册基础知识训练(含答案)
七年级上册基础知识考点集训一、知识点归类。
1.给加点的字注音。
痴想(chī) 凝成(níng) 诱惑(huò)屡次(lǚ) 耸立(sǒng) 喧腾(téng)一瞬(shùn) 目眩(xuàn) 晕倒(yūn)迂回(yū) 嘲笑(cháo) 啜泣(chuò)迸溅(bèng) 沉淀(diàn) 琼浆(qióng)纳罕(hǎn) 嶙峋(xún) 枯槐(huái)伫立(zhù) 酒酿(niàng) 伶仃(líng)熄灭(xī) 缀连(zhuì) 船舶(bó)盘虬(qiú) 倔强(jué) 相吻(wěn)弧线(hú) 珍珠链(liàn) 洗濯(zhuó)黎明(lí) 掷地(zhì) 蜕化(tuì)抖擞(sǒu) 发髻(jì) 镶上(xiāng)水藻(zǎo) 弥漫(mí) 绫纱(líng)化石吟(yín) 崩塌(tā) 憔悴(cuì)榆杨(yú) 诅咒(zǔ) 峰峦(luán)冰雹(báo) 诀别(jué) 荡漾(yàng)吐蕾(lěi) 丫杈(chà) 恍然(huǎng)焕然(huàn) 羚羊(líng) 怦怦(pēng)犄角(jī) 玷污(diàn) 脊梁骨(jǐ)碌碌(lù) 绽开(zhàn)2.给多音字注音。
瞬间(jiān) 论语(lún) 颤抖(chàn)称职(chèn) 忍俊不禁(jīn) 倔强(jiàng)济南(jǐ) 草长莺飞(zhǎng) 着落(zhuó)分外(fèn) 三年五载(zǎi) 躯壳(qiào)裹藏(cáng) 寒颤(zhàn) 朝霞(zhāo)应和(hè) 嫌恶(wù) 挑逗(tiǎo)西藏(zàng) 黄晕(yùn) 扒窃(pá)3.改正词语中的错别字。
7年级上册数学(人教版)试题解析、训练、答案—第1章第1节 正数和负数
2011-2012学年七年级数学(人教版上)同步练习第一章第一节正数和负数一、教学内容:1、了解正数和负数是怎样产生的,什么是相反意义的量;2、知道什么是正数和负数;3、理解数0表示的量的意义;4、有理数的概念及分类.二. 知识要点:1、负数产生的原因:(1)生活和生产的需要,对实际生活中出现的相反意义的量,如卖出与买入、盈利与亏损、上升与下降、增加与减少、前进与后退等,无法用自然数表示,为了解决这些问题人们引进了负数;(2)数学本身的需要,如对较小的数减去较大的数的问题的解决,需要引进负数.2、像3,2,1.8%这样大于0的数叫做正数;3、像-3,-2,-2.7%这样在正数前面加上负号“-”的数叫做负数.4、数0既不是正数,也不是负数;5、正整数、0、负整数、正分数、负分数都可以写成分数的形式,这样的数称为有理数.6、有理数也可以这样:有理数注:掌握分类的标准是关键,不同的标准就有不同的分法.三. 重点难点1、重点:①正数、负数、有理数的概念;②数0表示的量的意义;③有理数的分类.2、难点:体会数学符号与对应的思想,用正、负数表示具有相反意义的量的符号化方法.【考点分析】数是数学知识的基础,也是其他学科的工具,在近年来各地的中考试题中经常出现.全国大多数省市中考试题对数的概念单独命题,试题难度为低、中档次,题量约占总量的1%,题型以填空题、选择题居多.【典型例题】例1 用正数和负数表示下列具有相反意义的量.(1)温度上升3℃和下降5℃;(2)盈利5万元和亏损8千元;(3)向东10米和向西6米;(4)运进50箱和运出100箱.分析:本题中的上升和下降,盈利和亏损,向东和向西,运进和运出都是相反意义的量,如果我们规定上升、盈利、向东、运进为正,那么下降、亏损、向西、运出就为负.解:(1)+3℃,-5℃(2)+5万元,-8千元(3)+10米,-6米(4)+50箱,-100箱评析:用正负数表示相反意义的量,并不是固定不变的.我们只是习惯把向东、上升、盈利、增加、收入规定为正,把其相反意义的量规定为负.通过本题同学们要体会数学符号与对应的思想,学会用正、负数表示具有相反意义的量的符号化方法.例2 下列各数哪些是正数,哪些是负数?分析:首先确定我们熟悉的大于0的数,即正数,然后再观察带有“-”号的数,看“-”号后的部分是否大于0,因为“正数的前面加上负号便是负数”.特别注意:0不是正数,也不是负数.解:正数有:负数有:评析:分类要做到“不重复,不遗漏”.例3 给出一对数+2和-3,请赋予它们实际的意义.分析:此题为开放题,考查相反意义的量在实际生活中的作用,解题的关键是给“+”和“-”赋予生活中一组相反的意义,例如:收入和支出,前进和后退等.解:+2表示收入2元,-3表示支出3元+2表示前进2米,-3表示后退3米等.评析:对于两种具有相反意义的量,究竟哪一种意义的量为正的,哪一种意义的量为负的,并不是固定的,而是在实际的生活和生产中人们根据实际情况的要求人为规定的.例4 (2007城市北京武汉广州哈尔滨平均气温(单位:℃)-4.6 3.8 13.1 -19.4其中气温最低的城市是()A、北京B、武汉C、广州D、哈尔滨分析:根据生活经验和正、负数的意义我们知道,表示零下的负数温度比正数温度低,负数温度中负号后面的数值越大温度越低.显然,气温最低的城市是哈尔滨.解:D评析:这四个城市平均气温从高到低的顺序是:广州→武汉→北京→哈尔滨,它们对应的温度顺序是:13.1℃>3.8℃>-4.6℃>-19.4℃.通过本题同学们要初步理解这种将实际问题转化为数学问题的方法.思考:从这四个有理数的大小关系中你可以得出哪些结论?例5 如图所示,某化肥厂生产的颗粒磷肥外包装袋上标有净重:50±0.5kg,请你说说这是什么意思?分析:本题考查正、负数表示量的实际意义,以标准重量为基准:+0.5kg表示多出0.5kg,-0.5kg 表示少0.5kg,这都属于正常范围,因为实际生活中不能做到绝对准确的50kg,只能尽量减小误差.解:50±0.5kg表示这袋化肥的净重可能比50kg多,但不会超过50+0.5=50.5kg,可能比50kg少,但不会少于50-0.5=49.5kg.评析:在生产中,产品可能与标准规格有差异,也就是会产生误差.但误差不能太大,产品可略有不足或略有超出,即误差应在一个允许的范围内.不足用负数表示,超出用正数表示,这个范围就可以用正负数表示出来了.例6 下列说法正确的是()A、整数、分数和负数统称为有理数B、有理数包括正数和负数C、正整数都是整数、整数都是正整数D、0是整数,也是自然数分析:A分类时有重复,应改为整数和分数统称有理数,B有遗漏,应改为有理数包括:正有理数、0、负有理数.在C中正整数和整数在有理数系中属不同的等级,不是两个相同的概念,应改为:正整数都是整数,但整数不是正整数.只有D是正确的.解:D评析:数的范围扩大到有理数后,注意数的分类方法,特别是0的归属.0既不是正数,也不是负数;整数包括正整数、0、负整数,所以0是整数,当然也是有理数.【方法总结】通过本节的学习我们要掌握整数、分数、正数、负数、有理数的区分方法,体会符号化在数学问题中的重大意义,理解把实际问题转化为数学问题来解决的转化思想.【模拟试题】(答题时间:50分钟)一、选择题1、有五个数为其中正数的个数是()A、1个B、2个C、3个D、4个2、2008年12月某日我国部分城市的平均气温情况如下表(记温度零上为正,单位:℃),则其中当天平均气温最低的城市是(城市温州上海北京哈尔滨广州平均气温60-9-1515A、广州B、哈尔滨C、北京D、上海3、正整数集合和负整数集合合在一起,构成数的集合是()A、整数集合B、有理数集合C、自然数集合D、非零整数集合4、规定正常水位为0m,高于正常水位0.5m时,记作+0.5米,下列说法错误的是()A、高于正常水位1.5m记作+1.5mB、低于正常水位1.5m记作-1.5mC、-1m表示比正常水位低1mD、+2m表示比正常水位低2m5、如果收入200元记作+200元,那么支出150元记作()A、+150元B、-150元C、+50元D、-50元6、文具店、书店和玩具店依次坐落在一条东西走向的大街上,文具店在书店西边20m处,玩具店位于书店东边100m处,小明从书店沿街向东走了40m,接着又向东走了-60m,此时小明的位置在()A、文具店B、玩具店C、文具店西边20mD、玩具店东边-60m7、下面是关于有理数的叙述:①有理数分为正有理数和负有理数两部分;②有理数分为整数和分数两部分;③有理数分为正数、负数和零三部分;④有理数分为正分数、负分数、正整数、负整数和零五部分;⑤有理数分为正整数、负整数和零三部分.其中正确的有()A、1个B、2个C、3个D、4个8、一天早晨的气温是-7℃,中午的气温比早晨上升了11℃,中午的气温是()A、11℃B、4℃C、18℃D、-11℃二、填空题9、如果把顺时针转60°记作+60°,那么逆时针转30°记作__________.10、在电视上看到的天气预报中,绵阳王朗国家级自然保护区某天的气温为“-5℃”,表示的意思是__________.11、孔子诞生在公元前551年9月28日,则2007年9月28日是孔子诞辰__________周年.(注:不存在公元0年)12、把下列各数分别填入相应的括号:(1)整数集:{…};(2)正整数集:{…};(3)负整数集:{…};(4)分数集:{…};(5)正分数集:{…};(6)负分数集:{…};(7)有理数集:{…};(8)正有理数集:{…};(9)负有理数集:{…};三、解答题13、工商部门抽查了一些500g包装的白糖,检查的记录如下:10,-15,13,-20,-18,15,-31,24,-25,-5,-14,-9.你估计这里的正、负数表示什么?从这些数据中,你能获得哪些信息?14、用正、负数表示下面各组具有相反意义的量,并指出它们的分界点.(1)零上10℃与零下5℃;(2)高出海平面100m与低于海平面200m;(3)收入8元,支出6元.15、观察下列各数,找出规律后填空:(1)-1,2,-4,8,-16,32,……,第10个数是__________.(2)1,-3,5,-7,…,第15个数是__________.(3)1,-4,7,-10,13,…,第100个数是__________.【试题答案】一、选择题1、B2、B3、D4、D5、B6、A7、B8、B二、填空题9、-30°10、零下5摄氏度11、255712、(1)整数集:{20,-3,0,-1,+5…};(2)正整数集:{20,+5…};(3)负整数集:{-3,-1…};(4)分数集:(5)正分数集:{4.5,3.14…};(6)负分数集:(7)有理数集:(8)正有理数集:{20,4.5,3.14,+5…};(9)负有理数集:三、解答题13、正数表示包装超过500g,负数表示包装少于500g.一共抽查了12包白糖,其中不足500g的有8包,超过500g的只有4包,不足秤的约占67%,且个别不足秤的达到31g,是严重的短斤少两现象.14、(1)+10℃,-5℃,它们的分界点是0℃(2)+100m,-200m,分界点是海平面,用0表示(3)+8元,-6元,它们的分界点是不收入也不支出,用0表示.15、(1)512(2)29(3)-298试题使用说明各位使用者:本试题均是经过精心收集整理,目标是为广大中小学教师或家长在教学或孩子教育上提供方便!附:如何养成良好的数学学习习惯“习惯是所有伟人的奴仆,也是所有失败者的帮凶.伟人之所以伟大,得益于习惯的鼎力相助,失败者之所以失败,习惯的罪责同样不可推卸.”由此可知,良好的数学学习习惯是提高数学成绩的制胜法宝.良好的数学学习习惯有哪些呢?初中数学应该从课堂学习、课外作业和测试检查等方面养成良好的学习习惯.一、课堂学习的习惯课堂学习是学习活动的主要阵地.课堂学习习惯主要表现为:会笔记、会比较、会质疑、会分析、会合作.1.会笔记上课做笔记并不是简单地将老师的板书进行抄写,而是将学到的知识点、一些类型题的解题一般规律和技巧、常见的错误等进行整理.做笔记实际是对数学内容的浓缩提炼.要经常翻阅笔记,加强理解,巩固记忆.另外,做笔记还能使你的注意力集中,学习效率更高.2.会比较在学习基础知识(如概念、定义、法则、定理等)时,要运用对比、类比、举反例等思维方式,理解它们的内涵和外延,将类似的、易混淆的基础知识加以区分.如找出“同类项”和“同类二次根式”,“正比例函数”和“一次函数”,“轴对称图形”和“中心对称图形”,“平方根”和“立方根”,“半径”和“直径”,等概念的异同点,达到合理运用的目的.3.会质疑“学者要会疑”,要善于发现和寻找自己的思维误区,向老师或同学提问.积极提问是课堂学习中获得知识的重要途径,同时也要敢于向老师同学的观点、做法质疑,锻炼自己的批判性思维.学习中哪怕有一点点的问题,也要大胆提问,不能留下知识上的“死角”,否则问题就会积少成多,为后续学习设置障碍.4.会分析一是要认真审题:先弄清楚题目给出的条件和要解答的问题,把一些已知条件填在图形上,并将一些关键词做好标记,达到显露已知条件,同时又挖掘隐含条件的目的.如做几何体时,将已知的相等的角、线段、面积及已知的角、线段、位置关系等在图形中做好标记,避免忘记.再如做应用题时,象“不超过”“不足”等字眼,就暗示着存在不等量关系.只有弄清楚已知条件和所要解答的问题才能有目的、有方向地解题;二是要认真思索:依据题目中题设和结论,寻找它们的内在联系,由题设探求结论,即“由因求果”,或从结论入手,根据问题的条件找到解决问题的方法,即“由果索因”,或将两种方法结合起来,需找解题方法.要注意“一题多解”、“一题多变”、“一图多用”、“一法多题”等,拓展思路,训练自己的求异思维.5.会合作英国著名剧作家萧伯纳曾经说过“你给我一个苹果,我给你一个苹果,我们每人只有一个苹果;你给我一个思想,我给你一个思想,我们每人就有两个思想了”,这足以说明合作、交流的学习方式的重要性.我们主要的学习方式是自主学习,在独立思考的基础上,要适时地和同桌交流意见.在小组学习期间,要积极发表自己的观点和见解,倾听他人的发言,并作出合理的评判,以锻炼自己的表达能力和鉴别能力.二、课外作业的习惯课外作业是数学学习活动的一个组成部分,它包括:复习、作业等.1.复习及时复习当天学过的数学知识,弄清新学的内容、重点内容及难于理解和掌握的内容.首先凭大脑的追忆,想不起来再阅读课本及笔记.在最短的时间内进行复习,对知识的理解和运用的效果才能最好,相隔时间长了去复习,其效果不明显,“学而时习之”就是这个道理.同时,要坚持每天、每周、每单元、每学期进行复习,使复习层层递进、环环紧扣,这样才能在正确理解知识的基础上,熟练地运用知识.2.作业会学习的同学都是当天作业当天完成,先复习,后做作业.一定要独立完成,决不能依赖别人.书写一定要整洁,逻辑一定要条理.对作业要自我检查,及时改正存在的错误,三、测试、检查的习惯1.认真总结测试、检查前,可以借助于笔记,把某一阶段的知识加以系统化、深化,弥补知识的缺陷,进一步掌握所学知识.2.认真反思测试、检查后,通过回顾反思,查清知识缺陷和薄弱环节,寻找失误的原因,改进学习方法,明确努力方向,使以后的测试、检查取得成功.良好的学习习惯是提高我们学习成绩的决定因素,但必须持之以恒.。
人教版七年级上册数学基础训练69页至73页答案
人教版七年级上册数学基础训练69页至73页答案人教版七年级上册数学基础训练69页至73页答案你如果想要其他题目答案可以跟我分享QQ,直接拍照给你,反正都做到99页了·········(1)669,671,673(2)14,16,18(3)(4)24厘米选择:DBA哎?之前打了一堆来着,添了一句话就全没了,心累啊···········七年级上册数学基础训练泸科版24页到26页答案(1)5X +15> 4X-1解决方案; 5X-4X> -15-1X> -16日(2)2(X + 5)<3(X-5)解决方案:2X +10 <3X-15 BR> 2X-3X <-10-15-x <-25X> 25剩下的两个去了这一步分母按照第二个问题由完成上市OK啦第三题的题意:6X>或= 6-1.2七年级上册数学基础训练答案泸科版k=3a10=2960-8 80-14小红6米,爷爷4米74.。
ADADX+26=3X94 183160元35题甲63,乙45DBC504180(X-Y)=40032(X+Y)=40076..............1小时和3小时7、不会5千米泸科版七年级上册数学基础训练答案要基础训练哪个答案2011年七年级上册数学基础训练答案人教版第一章,有理数,正数和负数,基础平台1,第1题,d 第 2题,b 第3题,d 第4题,减少百分之6,第5题,向东运动2米0 第6题正28度有问题随时问,记得要谢我哦悬赏50 !50!人教版七年级上册数学基础训练40 41第1题选择 A B C C D 第2题 60分之X 10M A减B加C A的2次方减R的2次方乘以3.14 T加2 12A M-M乘以百分之10 奇偶 60乘0.8加括号x-60乘1.2 2分之12减3X乘1X 4N-4 18 1.填空题 13 6019 3N加1七年级上册数学基础训练沪科版答案没有的麻烦采纳,谢谢!泸科版七年级上册数学基础训练P56页第三题答案把题放上来课程基础训练七年级上册数学27页答案中考体验: C A B C A B A C B 低于 10 西北七年级上册人教版数学基础训练49到56页答案谢谢了,大神帮忙啊找jcxl.daxiang. 注册一个号验证码为DX00101010701 找七年级数学答案需要找的题在第几单元就下在第几单元下载很快只需一秒!就可以开启看了!采纳哦。
英语基础训练七年级上册人教版
英语基础训练七年级上册人教版一、词汇部分。
1. 重点单词。
- 名词。
- 家庭成员类:father(爸爸),mother(妈妈),parent(父母),grandfather(爷爷;外公),grandmother(奶奶;外婆),grandparent(祖父母;外祖父母),sister(姐妹),brother(兄弟)等。
- 学习用品类:pen(钢笔),pencil(铅笔),eraser(橡皮),ruler(尺子),book(书),notebook(笔记本)等。
- 颜色类:red(红色),blue(蓝色),green(绿色),yellow(黄色),black(黑色),white(白色)等。
- 动词。
- be动词:am,is,are。
例如:I am a student. He is my friend. They are my classmates.- 实义动词:have(有),like(喜欢),play(玩;打;弹奏)等。
例如:I have a pen. She likes reading. They play basketball.- 形容词。
- 描述人物特征的:tall(高的),short(矮的;短的),fat(胖的),thin (瘦的),nice(美好的;令人愉快的)等。
- 描述事物性质的:big(大的),small(小的),good(好的)等。
2. 单词记忆方法。
- 联想记忆法。
- 例如记忆“pencil”,可以联想“pen(钢笔)+cil”,想象一支钢笔旁边有一支铅笔。
- 分类记忆法。
- 把单词按照上述的名词、动词、形容词等类别进行分类记忆,同一类别的单词往往有相似的用法或者语境。
二、语法部分。
1. 一般现在时。
- 概念。
- 表示经常发生的动作、存在的状态或习惯性的行为。
- 结构。
- 当主语是第一人称(I/we)、第二人称(you)、复数名词或复数代词时,动词用原形。
例如:I like apples. We play football. They are students.- 当主语是第三人称单数(he/she/it或单个的人名、事物名)时,动词要变成第三人称单数形式(一般在动词原形后加 -s或 -es)。
七年级基础训练答案 人教版
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2012学年第一学期七年级练习卷
2012学年第一学期七年级练习卷(一)科学练习卷(出卷:陈步先)温馨提示:本次考试时间为90分钟,满分100分。
一、选择题(本题共25小题,每小题2分,共50分)1、科学已经与我们的生活密不可分,下列不属于科学研究的是 ( )A.小明到椒江的大陈岛旅游,为“甲午岩”的雄伟而叹服B.麦哲伦航海探险,发现地球是圆的C.苹果落在牛顿身上,结果他发现了万有引力D.天空布满了乌云,小明觉得特别闷热,由此他认为天快要下雨了2、下列哪种生物只能通过摄取食物以获得养料才能维持生活? ()A.青莱B.睡莲C.蜻蜓D.红松3、下列实验操作正确的是()4、植物细胞有而动物细胞没有的结构是( )。
A.细胞壁 B.细胞膜 C.细胞质 D. 细胞核5、某同学用同一把卷尺三次测得教室门的宽度为80.19厘米,80.20厘米,80.21厘米,则下列说法错误的是()A.80.21厘米这个记录结果是正确的B.此卷尺的最小刻度是1毫米C.测量结果最后应记作80.2厘米D.80.20中最末一位数字“0”是有意义6、我国北方的冬天,气温很低,有时能达到-39℃,河流会结上厚厚的一层冰,冰下有流动的河水,那么冰的下表面与水交界处的温度是()A.4℃ B.0℃ C.-39℃ D.略高于-39℃7、以下不属于长度单位的是()A、微米B、纳米C、光年D、毫米38、在使用温度计测液体温度时,下列做法不正确的是………………………………( )A.使用前必须观察它的量程,认清它的最小刻Array度值B.温度计的玻璃泡应全部浸入被测液体中,不要碰到容器底或容器壁C.温度计玻璃泡浸入被测液体中,应立即读数D.读数时玻璃泡要留在被测液体中,视线要与温度计的液面相平9、小虎在寻找蜗牛时,记录了不同环境下发现蜗牛的数量(如右图所示)。
据此,你可推测最适宜蜗牛生存的环境条件是( )A.阳光充足B.阴暗潮湿C.空气新鲜D.高温干燥10、一位同学先后用两支均未甩过的体温计测自己的体温,两支体温计示数分别是39.5℃和37.5℃,那么()A.他的体温低于或等于37.5℃ B.他的体温更接近39.5℃C.他的体温在37.5至39.5℃ D.他的体温一定是37.5℃11、小梅家有一批盆栽的郁金香,过去一直开红色花,现在却开出了紫色的花,有人认为这是土壤中缺水引起的,但小梅经过一段时间补充水分后,还是开紫色的花。
七年级上册数学基础训练答案
选择题1、两个互为相反数的有理数相乘,积为()A、正数B、负数C、零D、负数或零2、绝对值不大于4的整数的积是()A、16B、0C、576D、﹣13、五个有理数的积为负数,则五个数中负数的个数是()A、1B、3C、5D、1或3或54、现有四种说法:①几个有理数相乘,当负因数有奇数个时,积为负;②几个有理数相乘,积为负时,负因数有奇数个;③当x<0时,|x|=﹣x;④当|x|=﹣x时,x<0.其中正确的说法是()A、②③B、③④C、②③④D、①②③④5、某校期末统一考试中,A班满分人数占2%,B班满分人数占4%,那么满分人数()A、A班多于B班B、A班与B班一样多C、A班少于B班D、不能比较6、5个非零实数相乘,结果为负.则负因数的个数为()A、1个B、3个C、5个D、1个或3个或5个填空题7、﹣4×125×(﹣25)×(﹣8)= _________ .8、商场在促销活动中,将标价为200元的商品,在打八折的基础上再打八折销售,则该商品的售价是_________ 元.9、比﹣3大,但不大于2的所有整数的和为_________ ,积为_________ .10、科学家最新研究表明,吸烟会导致人的寿命减少,按天计算,平均每天吸一包烟可以导致寿命减少2小时20分,如果一个人一个月有n天每天吸一包烟,则这个月他的寿命减少了_________ 天.11、已知四个数:2,﹣3,﹣4,5,任取其中两个数相乘,所得积的最大值是_________ .答案与评分标准选择题1、两个互为相反数的有理数相乘,积为()A、正数B、负数C、零D、负数或零考点:有理数的乘法。
分析:1、有理数乘法法则:两数相乘,同号得正,异号得负,并把绝对值相乘.任何数同零相乘,都得0.2、两个互为相反数的数有两种情况,一正一负或都为0.解答:解:∵正数的相反数为负数,负数的相反数为正数,根据异号两数相乘得负,∴积为负.又∵0的相反数是0,∴积为0.故选D点评:本题考查了有理数的乘法法则.注意互为相反数的数有两种情况.2、绝对值不大于4的整数的积是()A、16B、0C、576D、﹣1考点:有理数的乘法;绝对值。
基础训练七年级上期答案
与人教版义务教育课程标准实验教科书配套基础训练(含单元评价卷)数学七年级上册参考答案课时练习部分参考答案第四章几何图形初步4.1 几何图形4.1.1 立体图形与平面图形第1课时1.实物立体图形长方体、球等平面图形三角形、圆等2.(2)(4)(5) (1)(3)(6) 3.长方体球圆台圆锥三棱柱4.B 5.D 6.C7.A8.(1)圆柱(2)圆锥(3)正方体(4)长方体(5)六棱柱(6)球体(7)四棱锥特征略9.圆柱球体圆锥五棱柱三棱锥圆10.①三角形;②长方形、圆、五角星;③梯形;④圆;⑤平行四边形;⑥平行四边形、梯形、五边形11.C12.B13.分类方法不唯一,如柱体:(1)(3)(4)(5)(6)(8);锥体:(2);球体:(7).14.(1)圆(2)长方形、正方形(3)平行四边形(4)四棱锥、长方体(5)圆锥、圆柱(6)长方体、三棱柱15. 19 16. 91第2课时1.D 2.A 3.A4.(1)圆柱(2)四棱锥(3)球5.三棱柱圆柱三棱锥正方体6.D7.A8.A9.A10.C11.B12.B13.A14.B15.(1)三棱柱(2)圆柱(3)四棱锥(4)圆锥(5)正方体16.(1)小亮(2)小明(3)小军(4)小强17.(1)如图答-9:图答-9(2)n可能为8,9,10,11. 18. 114.1.2 点、线、面、体1.线面体 2.线点 3. 6 8 3 12 4. 4 4 6 5.B 6.D7.C8.D9.B10.点动成线线动成面面动成体11.略12.B13.D14.⑤15.答案不唯一,如圆柱、球、圆锥等16.①⑧②⑥⑦⑨③④⑤⑩⑪17.(1)6 6 V+F=E+2 (2)20 (3)144.2 直线、射线、线段第1课时1.C2.C3.(1)外(2)上AC与BD (3)3 AB、AC、AD 4.C 5.B 6.D7. 3 8 1 8. 3 6 19.两点确定一条直线10.略 11.A12.C13.A14.D15.(1)3 6 10 (2)n2-n216.略17.(1)3(2)61015(3)s=n2+3n+22或s=(n+1)(n+2)2(4)231 应用:(1)28 (2)2018.答案不唯一,任取两个作答.如图答-10:图答-10第2课时1.C 2.C 3.A 4.D5.C 6.C7. 40 cm8.③9.D10.D11.D12.略13.(1)CN=0.5 cm(2)4∶514.AM=7 cm或AM=3 cm15.AD与BC的交点即为蓄水池的位置.画图略.16.(1)7 cm(2)0.5a cm描述略(3)0.5b cm图形略17.(1)点C处.(2)点C处.当工具箱放在点C处时,每个机器人取一次工具所走距离之和为:2(AC+BC+DC+EC)=2(AE+BD).当工具箱放在B、C之间的点M处时,AM+BM+CM+DM+EM=AE+BD+CM>AE+BD.同样可说明放在其他位置时,5个机器人所走距离之和都大于AE+BD.所以,应将工具箱放在C处.4.3 角4.3.1 角第1课时1.D2.D3.B4.∠AGH、∠AGE、∠1、∠BGH∠2、∠3、∠CHE、∠DHF∠EGB、∠EHD、∠CHF5.B 6.A7.A8.B9. 2 ∠A、∠B10.略11.D12.C13.D14.(1)2个∠A、∠D(2)1个∠OCB(3)不是(4)∠BOC15.(1)3 (2)6 (3)10 (4)(n+1)(n+2)2第2课时1. 1分的角1′1秒的角1″2. 6 360 0.5 303. 13161124.B 5.D 6. 120°75°7.(1)42 20 24 (2)56.428.(1)129°18′(2)143°15′(3)163°3′9.C10.B 11.(1)91°9′(2)21°21′48″(3)87°4′(4)14°38′34″12.(1)7点42011分.(2)7点6011分.13.40分钟.14.(1)∠A+∠B+∠C=180°(2)∠A+∠B+∠C+∠D=360°(3)∠A +∠B+∠C+∠D+∠E=540°4.3.2 角的比较与运算1.B 2.∠BOC∠AOC∠AOB∠BOC 3.(1)∠BOC∠DOC∠AOB (2)∠AOC∠BOD(3)∠AOB∠AOD4. 121°5.C 6.D7.D8. 1809.B10.D11.A12.①②③13. 90°14. 25°或65°12.5°或32.5°15.(1)(2)(3)(4)(5)略(6)EF=EG=FG,∠EFG=∠EGF=∠GEF=60°16. 19°. 17.(1)45°.(2)12∠α. (3)12∠α. (4)∠MON=12∠AOB4.3.3 余角和补角第1课时1.B2.B3.(1)相等同角的余角相等(2)相等等角的补角相等4.(1)55°39′145°39′(2)126°(3)155°5.C 6.A7. 105°75°8. 45°90°9. 6对,分别是∠AOC与∠BOC,∠AOD与∠BOD,∠AOD与∠COE,∠AOE与∠BOE,∠AOE与∠COD,∠AOE与∠DOE10.B11.B12.D13.D14.B15. 126°16.∠DOE∠AOD、∠BOC17.(1)∠4、∠7(2)∠3理由略18.(1)9 (2)4 (3)3 (4)2 (5)6 (6)11 (7)9 (8)∠AOE、∠EOD、∠BOC(9)∠AOC、∠BOE第2课时1.D 2.B3.(1)北偏东70°(2)南偏东40°(3)南偏西50°(4)160°4.A 5.A 6. 40°7. 30°8.A9.D10. 165°11.南偏西60°12.(1)南偏西60°(2)南偏东15°(3)北偏东55°(4)北偏西65°13.图略14.图略15.(1)图略(2)略4.4 课题学习设计制作长方体形状的包装纸盒1.略 2.B 3. 7 4.D 5.B 6.(1)F (2)C7.(1)六棱柱(2)3000cm28.D9.A10. 17 11.S=16,V=612. 1与2,6;3与5;7与11;8与10 13.(1)圆柱(2)1570第四章复习课第1课时1.B2.B3.B4.∠1<∠2<∠35. 106.两点确定一条直线7. 4或88.(1)角平分线(2)∠BOC(3)∠3、∠4(4)∠DOF(5)∠AOE9.B10.C11.A12.C13. 50°14. 5 15. 55°16.(1)91°15′(2)116°10′17.(1)(2)(3)略(4)10 (5)∠AOB、∠AOD、∠COD∠DOE、∠BOC、∠BOE ∠AOC、∠BOD、∠COE∠AOE(6)∠BOC=∠DOE,∠AOC=∠BOD=∠COE(7)1 118.∠DOE=90°,∠BOE=76°第2课时1.D 2.D 3.A 4.A 5.C6.C7.(1)23.5 (2)30 1800 8. 6 9. 1 10.D11.B12.C13.C14.A15. 54 cm16. 13 17. 30°18. 5 cm19. 8n-4总复习课第1课时(第一、二章)1.D2.A3.C4.C5.A6. 23-32237. 1.30×1078.-563 9. 4或-4 -310.(1)-12 (2)28 (3)13(4)-9011.(1)7a2-9a (2)4ab+a+b (3)-5a (4)2a2+ab 12.A13.D14.C15.C16.四三-4x3y 2 17.(n+1)2-n2=(n+1)+n=2n+1 18. 419.(1)4 (2)38(3)7x-11y (4)5x2y+2xy-320.(1)周四最高,周二最低.(2)上升了.21.(1)1n-1n+1(2)①20102011②nn+1(3)10054024第2课时(第一、二章)1.-35-235132. 2 2或-83. 0.576 百4.B5.D 6.A7. 15 2n-1 8.(1)-1 (2)-18 (3)1 9.(1)b2-a2(2)5a2+3ab (3)10m2n-5mn210.D11.B12.C13.D14. 8a3-7 -7a2b+4ab2+b315. 10 3n+1 16.(1)-572(2)4 (3)017.原式=x2y-xy2,当x=-1,y=2时,原式=6.18. 2A-B=x(m+4)+4.因为2A-B的值与x的取值无关,所以m+4=0,即m=-4.19. 10a +10b 20.(1)34 (2)4 (3)-13 -13第3课时(第三、四章)1.A 2.B 3.D 4.D 5. 7 6. 6 5 107. 12 cm 8.(1)42° (2)不会 9.B 10.D 11.D12.B 13.C 14.C 15. 2m -n 16. 130°17. 3168 18.(1)x =1 (2)x =5 (3)y =3 (4)y =5319. 200元 20.略21.(1)设B 市与A 市之间的路程为x 千米,依题意,得200·x 100+15x +2000=200·x 80+20x +900-1100.解这个方程,得x =400.答:B 市与A 市之间的距离为400千米. (2)当火车与汽车的总费用相同时,有200⎝ ⎛⎭⎪⎫s 100+2+15s +2000=200⎝ ⎛⎭⎪⎫s 80+3.1+20s +900.解这个方程,得s =160.即:当B 市与A 市的距离大于160千米时,选择火车运输较合算;当B 市与A 市的距离等于160千米时,选择火车和汽车两种方式运输均可;当B 市与A 市的距离小于160千米时,选择汽车运输较合算.第4课时(全书)1.B 2.B 3.D 4.A 5.D6.B 7. 13(5-x)=2x +1 8.①②④ 9.(1)-414 (2)719(3)2xy 2+xy -5 (4)a 2-5ab 10.(1)x =15(2)x =-3 11.设∠1=x°,则12(180-4x)+x =70.解得x =20,所以3x =60.所以∠2的度数是60°.12.B 13.B 14.A 15. 2x 2-x +116. 2317.化简,得原式=6x2-5,把x=-1代入,得原式=1.18.(1)40x+3200 36x+3600 (2)当x=100时,两者一样;当x大于100时,方案②合算;当x小于100时,方案①合算.19.(1)①∠DOE、∠BOF ②36°(2)28°。
人教版七年级上册英语基础能力训练(附答案)
初中英语学习材料madeofjingetieji新版初中七年级英语上册Unit 5 Do you have a soccer ball?基础能力训练(附答案)【基础扫描】I. 根据句意和首字母,完成单词拼写1. He doesn’t play sports, he only w________ them on TV.2. My father has a g________ sports collection.3. Do you have a c________ game?4. L________ play volleyball.5. Do you have a b________ bat?II. 单项选择1. I don’t have a volleyball, but my brother has ________.A. aB. itC. oneD. an2. ________ a basketball?A. Do you haveB. Are you haveC. Are youD. Do you are have3. ―Let’s play ba seball. Do you have a baseball bat?―________.A. Sorry, I doB. Sorry, I don’tC. Yes, I don’tD. Yes, I can4. ―Let’s watch TV.―________.A. That’s sound goodB. That sounds wellC. That’s sounds wellD. That sounds good5. ―Does Tom join us?―________.A. Yes, I doB. Yes, he doC. No, he doesn’tD. No, he don’t6. They are my good friends. I love ________ and they love ________.A. they, IB. them, meC. them, ID. they, me7. We watch every basketball game on ________TV.A. aB. anC. theD. /8. The girl ________ every Sunday.A. play sportB. plays sportC. play sportsD. plays sports9. Does she like ________?A. play soccerB. playing ping-pongC. play volleyballD. plays basketball10. ―Can you give me a hand?―________A. You’re welcome.B. No, I can’t.C. Sure, what’s wrong?D. Yes, I could. III. 按要求改写下列各句, 每空一词1. Jack knows my name. (改为否定句)Jack________ ________ my name.2. Ann has a brother. (改为一般疑问句)________ Ann__ ______ a brother?3. Do they like eggs? (作肯定回答)________, ________ ________.4. We all learn Chinese. (改为同义句)________of ________learn Chinese.5. Lily has ten pencils. (对画线部分提问)________ ________pencils ________Lily have?6. We have a soccer ball. (改为否定句)We ________ ________ a soccer ball.7. Jiang Feng has a baseball. (对画线部分提问)________ ________ Jiang Feng ________?8. Sue has a small sports collection. (改为否定句)Sue ______ ______ a small sports collection.IV. 下列各句均有一处错误,在错处下面划线,并改正1. Excuse me, Miss Green. Can I ask you any questions?__________________________________2. Do you think Mary have a TV?__________________________________3. Can Li Lei play the tennis?__________________________________4. The boys play football on every Monday afternoon.__________________________________5. Does Tom has a baseball bat?__________________________________6. ---Can you go with me?--- Sorry, I’m not.__________________________________7. Are you want to watch TV?__________________________________8. Let’s to have a look.__________________________________9. They only watch it in TV.__________________________________10. Please to take these balls to the room.__________________________________V. 根据汉语意思完成下列各句,每空一词1. 那听起来很有趣。
人教版七年级上基础练习
人教版七年级上基础练习填空部分1.生物的基本特征:生物的生活需要;生物能(绝大多数生物需要吸入,呼出;生物能(如排汗和落叶);生物能对外界作出反应;生物能生长繁殖;除外,生物都是由构成的(病毒也是生物)。
2.细胞是生物和的基本单位。
3.科学探究的方法:(要有明确的观察目的、要全面、细致和实事求是)(要明确调查目的和调查对象,制订合理的调查方案)、和(资料的形式包括文字、图片、数据和音像资料等)、实验等4.生物圈包括、和。
细菌和真菌分布在各个圈层,而人类的活动可以到达生物圈的各个圈层,人类的“立足点”是岩石圈。
5.生物圈为生物的生存提供的基本条件有:营养物质、阳光、空气和水、适宜的和一定的等。
6.生物的生存依赖于一定的环境。
影响生物生活的环境因素可分成两类:(光、空气等)和(捕食关系、竞争关系、合作关系等)。
7.探究活动的一般过程:提出问题、、制定计划、、得出结论、表达和交流。
8.在研究对研究对象的影响时,所进行的除了以外,的实验,叫做对照实验。
对照实验的只有一个。
9.对照实验的是实验变量的对象组;是对实验假设而言,不接受实验变量处理的对象组。
10.现在生存的每一种生物,都具有与其相适应的和。
生物的适应性是。
11.生物对环境的是指生物在一定的环境中生物形态结构和生活方式等方面发生了改变;生物对环境的是指由于生物的存在使环境发生了如何的改变(如植物能提高空气的湿度)。
生物以各种方式适应环境,影响环境。
12.在内,与所形成的统一的整体叫做。
如一条河,注意对整体的理解。
13.生态系统的组成包括和,其中生物部分包括、和分解者;如阳光、空气、水、温度等。
14.之间的关系,主要是的关系,这样就形成了。
食物链彼此交错连接形成。
食物链的正确写法是从开始的。
15.生态系统中的就是沿着流动的。
生态系统的最终能量来自于,来自于生产者,生态系统中含能量最多的是生产者。
16.能量随食物链逐级,有毒物质随食物链逐级。
根据生物体内有毒物质的多少可以写出食物链。
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新目标英语七年级上册基础练习题单项选择( )1. There is _____ old map on ____ wall. It’s ____ map of____ China.A. a; the; a; theB. an; a; the; /C. the; the; a; theD. an; the; a; /( )2. Thanks_________ the great photo of your family.A. atB. withC. byD. for( )3. I usually get up ________ eight o’clock _______Sunday mornings.A. at; inB. at; onC. in; atD. on; in( )4. ----Do you like salad_________ lunch?----No, I don’t.A. withB. forC. onD. at( )5. Lucy is in front of Lily and Mike is behind Lily. So we can say Lily is _______ Lucy and Mike.A. behindB. in front ofC. betweenD. in( )6.----Does your brother _________ soccer_______________?----No, he doesn’t.A. plays, everydayB. plays, every dayC. has, every dayD. play, every day( )7. ----___________is your pencil case?----It’s red.A. WhatB. What colorC. What’s colorD. Where ( )8. ----___________is your pencil case?----It’s in my backpack.A. WhatB. WhenC. HowD. Where( )9. This is __________book and that is ___________ pencil case.A. he, sheB. his, sheC. him, herD. his, her( )10. _____ are good friends.A. I and JackB. Jack and IC. Jack and meD. Me and Jack( )11.. My sister __________a new backpack.A. haveB. hasC. isD. are( )12. ----Let’s _________soccer!----That________ great.A. playing, is soundB. play, listensC. play, soundsD. plays, sounds( )13.---Can your mother ________?--- Yes, she can, but she ________ swim very well.A. swimming; can’tB. swimming; canC. swim; can’tD. swim; can( )14. ----Do you like apples?----Yes, I __________.A. likeB. doC. don’tD. can( )15.---How are you?---________.A. YesB. NoC. Fine, thank youD. OK ( )16. ----___________. Is that your ruler?----No. Mine is green.A. SorryB. How are youC. Excuse meD. How do you do( )17. There are _________months in a year and December is _______month.A. twelve; twelvethB. twelfth; twelveC. twelve; twelveD. twelve; the twelfth( )18. I like ___________ and ____________.A. tomatos, broccoliB. tomatoes, broccolisC. tomatoes, broccoliD. tomato, broccolis( )19. --- ___________?--- It’s September 11.A. What day is it todayB. What’ s the date today?C. What’s the timeD. What would you like? ( )20. _______ clever boy he is !A. HowB. What aC. WhatD. How a ( )21. ---Why don’t you like biology?---Because i t’s ______, and I always fall as leep in class.A. interestingB. excitingC. funnyD. boring ( )22 .I can’t think _______________.A. what is his jobB. what his is jobC. what his job isD. his job is what完型填空Many people think the more time is spent, the more workwill be done. So students have to spend the whole 23doing school work except the three meals. It is 24 to see students struggle in a sea of school work 25 at school and at home.Modern students usually have many 26 . They love music and sports. They like read ing and watching TV. A two-day weekend can get them 27 from too much homework, and they can do what they like. But still teachers do not think about it.28 they have too much school work, they have no time to enjoy themselves. Students are really tired of their weekend homework. So they usually don’t do their weekend homework29 Sunday night. And there is not enough time for so much work, so students have to finish it 30 . The weekend homework makes teachers 31 .Things always get 32 without right ideas. Too much school work makes students lose interest in learning. It’s also bad for their health.A horse runs faster after a 33 . But for students only rest is not enough. So such a condition should be 34to give students both pleasure and knowledge.Please give students less homework but leave them more free time.( ) 31. A. day B. morning C. afternoon D. week ( ) 32. A. never B. common C. glad D. hardly ( ) 33. A. both B. either C. neither D. none ( ) 34. A. books B. interests C. sports D. friends ( ) 35. A. busy B. pleased C. away D. tired ( ) 36. A. Though B. With C. While D. Because ( ) 37. A. until B. when C. at D. on ( ) 38. A. good B. poor C. carelessly D. happy ( ) 39. A. happy B. angry C. relaxed D. annoying ( ) 40. A. better B. afraid C. worse D. wonderful ( ) 41. A. minute B. moment C. meal D. rest ( ) 42. A. kept B. changed C. same D. different阅读理解(A)Visit Swansea ZooCome and see the Indian elephants and the new tigers from America. The bears are waiting to meet you, and the lovely dogs from Australia are waiting to laugh at you, and the giraffes f rom Zamb ia are waiting to look down on you.Keep the zoo clean!Do not touch, give food or go near the animals.( )43. How many kinds of animals are talked about in the passage?A. Four.B. FiveC. SixD. Seven ( )44. Now the Smiths are in the zoo with their two sons. One is14 and the other is 10. How much are the tickets together?A. $5.00B. $4.00C. $3.00D. $2.00 ( )45. The zoo opens ________ days a week.A. oneB. twoC. fiveD. seven ( )46. From the passage we can guess the animal “giraffe” must be very __________.A. longB. tallC. strongD. fat ( )47. Which of the following can be done in the zoo?A. To give some food to the fish.B. To touch the monkeys on the heads.C. To throw things to the bears.D. To take a few nice photos.(B)Rubber is very important in the modern world. We use it as tires for cars, buses, trucks, motorbikes and planes. We use large trucks and other machines to build road. They have large rubber tires.Natural rubber comes from trees. Most of the world’s rubber comes from Malays ia, Indonesia and Thailand in Southeast Asia. We also make rubber from oil. This kind of rubber becomes hot very fast. We can use it for only some kinds of tires.Now scientists can make rubber from guayule. This wild plant grows in northern Mexico and southwestern United States. It doesn’t need much rain. It can grow in desert soil. Guayule rubber is nearly the same as rubber from the rubber tree.Some Americans in Arizona plan to start guayule farms. They know a lot about framing in the desert. The farms will usepoor desert land and give people jobs. They think they can make a lot of money from guayule rubber.Poor desert countries in Africa could grow guayule too. People could make money on their own desert land. If they grow their own rubber, they will not have to buy it from other countries.( )48. Rubber trees can grow ______.A. everywhere in the worldB. only in AmericaC. in some southeast countries of AsiaD. in desert soil ( )49. How is the rubber made from oil?A. The same as the natural rubber.B. Better than the natural rubber.C. It can get hot quickly.D. It can be made into all kinds of tires.( )50. What is guayule?A. A plant growing in the desert wildly.B. A big tree in northern Mexico.C. A grass that doesn’t need any rain.D. A plant only growing in southern United States. ( )51. Why do people in Arizona plan to have guayule farms?A. Because rubber can be made from guayule.B. Because there are lots of desert land in Arizona.C. Because they can make money from guayule rubber.D. All of the above.( )52. Who learn from the people in Arizona to grow guayule?A. All Africa people do.B. None of the African people do.C. The African people who live in desert countries do.D. The African people who need rubber do.(C)In the last 500 years, nothing about peop le—their clothes, ideas, or languages has changed as much as what they eat. The original chocolate drink was made from the seeds of cocoa tree by South American Ind ians. The Spanish introduced it to the rest of the world during the 1500's. And although it was very expensive, it quickly became fashionable. In London shops where chocolate drinks were served became important meeting places. Some still exist today.The potato is also from the New World. Around 1600, the Spanish brought it from Peru to Europe, where it soon was widely grown. The potato was the main food at Irish table. Thousands of Irish people starved(饿死) when the crop failed during the"Potato Famine"(土豆饥荒) during 1845- 1846,and thousands more were forced to move to America.There are many other foods that have traveled from South America to the Old World. But some others went in the opposite direction. Brazil is now the world's largest grower of coffee, and coffee is important crop in Colombia and other South American countries. But it is native to Ethiopia. It was first made into a drink by Arabs during the 1400's.According to an Arab ic story, coffee was discovered when a man named Kald i noticed that his goats were attracted to the red fruits on a coffee bush. He tried one and experienced the"wide-awake" feeling that one-third of the world's population now starts the day with.( )53. According to the passage, which of the following has changed the most in the last 500 years?A. FoodB. Chocolate drinksC. PotatoD. Coffee( )54.”Some” in the sentence “Some still exist today” refersto .A. cocoa treesB. chocolateC. shopsD. meeting p laces( )55. Thousands of Irish people starved because .A. they depended on the potatoB. they were forced to move to AmericaC. the weather conditions in Ireland were not fit for growing the potatoD. the potato harvest was bad( )56. Coffee originally came from .A. BrazilB. ColombiaC. EthiopiaD. Arabia ( )57. The writer used an Arab ic story to prove that .A. coffee was first discovered by KaldiB. coffee was first discovered by Kald i's goatsC. coffee was first discovered in south American countriesD. coffee drinks were first made by Arabs任务型阅读In a classroom in any countries, the teacher teaches more than art or history or language. He or she teaches something behind the culture of the country.In a country such as the United States, people with different history, culture and language join together and they pay attention to personal ideas. Teachers try to make each student special. Students do not have to remember a lot of information, instead,they work and find answers by themselves. There is often discussion in the classroom. At an early age students learn to have their own ideas. Their education encourages personal thought. The importance is placed on how to arrive at an answer and not only to get the correct answer.In most Asian countries, people have the same language, history and culture. Perhaps for this reason, the education there pays more attention to group goals than personal ideas. Children in China and Japan often work together and help each other on homework. In the classroom, the ways of teaching are often very traditional. The teacher says, and the students listen. There is not much discussion. Instead, the students repeat rules or information that they have been taught in order to keep them in mind.In many ways these differences come from different educational ideas. In western countries, teachers are taught to help students to learn. They make it eas ier for the students to learn by themselves. In some Asian countries, however, teachers often feel that their job is to pass knowledge to students.1. Do students in the United States have to remember a lot of information?_________________________________________________2. There is often discussion in the classroom in American, is there?_________________________________________________ 3. What does the education in the United States encourage?_________________________________________________ 4. What does the education in some Asian countries pay more attention to?_________________________________________________ 5. What can we learn from this passage?_________________________________________________ 四、词汇运用:There is an old saying, “ A woman’s place is in the home.” That isn’t true any more in the United States. In 1970 only 36% women 1 outside home, but in 1989 more than 65% women did. The 2____ increases every year.Why are so 3 women working outside home? For single (单身的) women, it’s 4 . And because the cost of living has increased 5 , many married women also have to start working. Finally, as more women get more and moreeducation, they 6 no longer happy to stay at 7 as housewives.What kind of jobs do women have? Most women work at traditional women’s 8 as secretaries( 秘书), librarians,9 and teachers. But they’re talking trad itional men’s jobs,10 . They’re becoming scientists, doctors, business women and pilots.五、完成句子:1. 你的电话号码是什么?----是281-9167。