九上第四单元练习题

人教版九年级化学上册第四单元检测试卷（含答案）可能用到的相对原子质量：H：1C：12N：14O：16S：32Ca：40Fe：56一、选择题(本题包括15小题，1～10题每题2分，11～15题每题3分，共35分)1．下列关于天然水的净化操作中，净水程度最高的是()A．沉降B．过滤C．蒸馏D．吸附2．自来水厂生产流程如图所示，其中分离水中固态杂质的设备是()(第2题)A．反应沉淀池B．过滤池C．活性炭吸附池D．清水池3．某无人机的动力来源于锂电池，锂电池放电时生成亚锰酸锂(LiMnO2)，其中锂元素显＋1价，则锰元素的化合价是()A．－3 B．＋2 C．＋3 D．＋44．下列化学用语表示正确的是()A．两个氧分子——O2B．氯化铝中铝元素的化合价——Cl3C．氯酸钾——KClO3D．钠原子的结构示意图——5．为响应党的号召，益阳市采取了一系列落实“绿水青山，就是金山银山”这一理念的措施，以保护生态环境。

下列措施中，益阳市不会采纳的是() A．拆除水上娱乐设施，恢复湿地生态B．建立污水处理厂，处理城市生活污水C．整改或关停排放物不达标的企业D．大规模围湖造田，以发展经济6．下列有关净化天然水的实验方案中，不正确的是()A．向天然水中加入明矾，可加速悬浮杂质的沉降B．加入活性炭，可吸附水中的色素和异味C．除去天然水中的泥沙，可采用蒸发结晶法D．除去可溶性杂质得到纯净水，可采用蒸馏的方法7．水是我们日常生活必不可少的物质，下列有关水的说法错误的是() A．水是由氢元素和氧元素组成的B．生活中可通过煮沸降低水的硬度C．洗菜、洗衣和淘米的水可用来浇花、拖地或冲厕所D．水通电分解时正极产生的氢气与负极产生的氧气体积比约为2∶18．最近科学家发现，水在－157 ℃超低温、正常压力或真空条件下仍呈液态，比蜂蜜还黏稠。

下列关于这种“高密度液态水”的说法正确的是() A．化学性质与普通水不同B．分子不再运动C．氢、氧两种原子的个数比为2∶1 D．分子间的间隔比普通水大9．下列各组物质中，前者是化合物，后者是混合物的是()A．胆矾、洁净的空气B．液氧、碘酒C．冰水共存物、碳酸钠D．稀硫酸、加碘食盐10．现有：①FeO、②Fe2O3、③Fe3O4、④FeS四种含铁的化合物，其中含铁元素的质量分数由大到小的顺序是()A．①>②>③>④B．①>③>②>④C．③>②>①>④D．④>③>②>①11．丙氨酸是一种常见的氨基酸，其化学式为C3H x O2N，相对分子质量是89，下列说法正确的是()A．丙氨酸属于氧化物B．丙氨酸中碳、氮元素的质量比为3∶1 C．丙氨酸化学式中x＝7 D．每个丙氨酸分子中含有一个氧气分子12．推理是学习化学的一种重要方法，下列推理得出的相关结论合理的是() A．分子可以构成物质，所以物质一定是由分子构成的B．单质和氧气的反应都是化合反应，所以化合反应都是单质和氧气的反应C．氧化物中一定含有氧元素，所以含有氧元素的化合物一定是氧化物D．化合物是由不同种元素组成的纯净物，所以只含一种元素的物质一定不是化合物13．化学用语是学习化学的重要工具。

2024年人教版九年级上册英语第四单元课后练习题（含答案和概念）试题部分一、选择题：A. attractB. interestC. involveD. encourageA. attractedB. interestedC. involvedD. encouraged3. Which of the following sentences uses the word "encourage" correctly?A. The teacher encouraged me to finish my homework.B. The teacher encouraged me to go to bed.C. The teacher encouraged me to eat more.D. The teacher encouraged me to watch TV.4. What is the past tense of "attract"?A. attractedB. attractC. attractsD. will attract5. Choose the best translation for "interest" in Chinese.A. 兴趣B. 重要性C. 关系D. 义务6. Which sentence is a correct question using "How"?A. How you like the movie?B. How do you like the movie?C. How you did like the movie?D. How did you like the movie?7. What is the correct form of "There be" sentence?A. There is a book on the table.B. There have a book on the table.C. There has a book on the table.D. There had a book on the table.8. Which word can be used to describe someone who is very interested in sports?A. enthusiasticB. boredC. lazyD. tiredA. interestedB. interestingC. interestD. interests10. Which of the following sentences is NOT a suggestion?A. Let's go to the park this weekend.B. I suggest we go to the park this weekend.C. Why don't we go to the park this weekend?D. I think you should go to the park this weekend.二、判断题：1. The word "attract" and "interest" have the same meaning. ( )2. "Encourage" means to give someone support and confidence. ( )3. The past tense of "encourage" is "encouraged". ( )4. "There is" and "There are" can be used interchangeably. ( )5. "Enthusiastic" is a negative adjective. ( )6. A question using "How" always starts with "How do". ( )7. "There have" is a correct form of "There be" sentence. ( )8. The word "bored" can be used to describe someone who is very interested in something. ( )9. "Interesting" and "interested" can be used interchangeably. ( )10. A suggestion always starts with "I suggest". ( )三、填空题：1. The opposite of "bored" is ________.2. If someone is very interested in a subject, we can say they are ________ about it.3. To ask for permission, we can say "Can I ________ your book?"4. "There ________ a lot of books on the shelf" is a correct sentence.5. The teacher ________ us to participate in the school's sports day.6. If you want to suggest something, you can say "Whydon't we ________?"7. The correct form of "There is" in plural is "There________."8. "I am ________ in learning new languages" is a correct sentence.9. The past tense of "suggest" is ________.10. To make a polite request, we can say "Could youplease ________ me?"12. If something is very attractive, it has a strongpower of ________.13. "She ________ her audience with her speech" means she made them interested.14. To express interest in someone's hob, you can say"I'm ________ in your hob."15. "There ________ many students in the classroom" is a correct sentence.16. The correct form of "There is" for uncountable nounsis "There ________."17. "I ________ you to read this book" means I advise you to read it.18. To describe someone who is not interested in anything, we can use the word ________.19. "The ________ of the movie was so strong thateveryone wanted to watch it."四、简答题：1. Explain the difference between "interested" and "interesting."2. How do you form a question using "How"?3. What is the correct structure of a "There be" sentence?4. Give an example of how to use "encourage" in a sentence.5. What is the past tense of "attract"?6. How do you make a suggestion in English?7. What is the opposite of "encourage"?8. Write a sentence using "There are" with a plural noun.9. Explain how to use "suggest" in a sentence.10. How do you express lack of interest in something in English?一、选择题答案：1. A. attract2. A. attracted3. A. The teacher encouraged me to finish my homework.4. A. attracted5. A. 兴趣6. B. How do you like the movie?7. A. There is a book on the table.8. A. enthusiastic9. A. interested10. B. I suggest we go to the park this weekend.二、判断题答案：1. ×2. √3. √4. ×5. ×6. ×7. ×8. ×9. ×10. ×三、填空题答案：1. interested2. enthusiastic3. borrow4. is5. encouraged6. go7. are8. interested9. suggested10. help11. heart12. attraction13. attracted14. interested15. are16. is17. suggest18. bored19. attraction20. Would四、简答题答案：1. "Interested" is used to describe someone who has a feeling of interest in something, while "interesting" is used to describe something that is likely to interest someone.2. You form a question using "How" starting with "How" followed the subject and verb, for example: "How do you like it?"3. The correct structure of a "There be" sentence is "There" + verb (is/are) + subject + additional information.4. Example: The teacher encouraged us to participate in the school's sports day.5. The past tense of "attract" is "attracted."6. To make a suggestion in English, you can use phrases like "Why don't we," "Let's," or "I suggest that we"7. The opposite of "encourage" is "discourage."8. Example: There are many books on the shelf.9. Example: I suggest we start the meeting on time.10. To express lack of interest, you can say "I'm not interested in" or "I don't have much interest in"Vocabulary: The test covers understanding and using vocabulary related to interest, attraction, and encouragement.Grammar: Questions test knowledge of verb tenses (past tense), sentence structure (There be sentences), and question formation (How questions).Adjectives: The test assesses the use of adjectives like "interested," "interesting," "enthusiastic," and "bored."各题型知识点详解和示例：选择题： Tests the ability to choose the correct word or phrase based on context. It also checks the understanding of vocabulary and grammar rules.Example: "The teacher encouraged me to finish my homework" tests the correct use of the verb "encourage."判断题： Assesses the understanding of grammatical rules and vocabulary usage.Example: "The past tense of 'encourage' is'encouraged'" tests the knowledge of verb conjugation.填空题： Evaluates the ability to use vocabulary and grammar correctly in sentences.Example: "The opposite of 'bored' is ________" teststhe knowledge of antonyms.简答题： Tests the ability to explain grammatical concepts and use them in sentences.Example: Explaining the difference between "interested" and "interesting" requires an understanding of adjectives and their usage.试题部分一、选择题：1. In Unit 4, which word is used to describe a person who is good at cooking?A. ChefB. ArtistC. ScientistD. Athlete2. Which of the following sentences uses the simplefuture tense correctly?A. I will go to the movies last night.B. She will visit her grandparents next week.C. They will goes to the park tomorrow.D. He will eating breakfast in the morning.3. What is the correct form of the word "invite" in the past tense?A. InvitedB. InvitedC. InviteD. InvitingA. WhereB. WhenC. WhyD. How5. Which of the following phrases means "a long time ago"?A. A few days agoB. A week agoC. A month agoD. A long time ago6. In English, which word is used to connect two independent clauses?A. BecauseB. AndC. ButD. Or7. What is the correct form of the word "happy" when describing multiple people?A. HappyB. HappiesC. HappiesD. Happiness8. Which of the following sentences is in the passive voice?A. The teacher taught the students.B. The students were taught the teacher.C. The teacher teaches the students.D. The students teach the teacher.A. DoB. DoesC. DoingD. DidA. UnB. lyC. ReD. ness二、判断题：1. The past tense of "do" is "did". ( )2. "A lot of" and "lots of" can be used interchangeably. ( )3. The simple present tense is used to describe actions that happen regularly. ( )4. "Whose" is a possessive pronoun. ( )6. "They" is a singular pronoun. ( )7. The past participle of "go" is "went". ( )9. "He" and "she" are subjective pronouns. ( )10. "There" and "their" have the same meaning. ( )三、填空题：1. The past tense of "eat" is ________.2. "I am" is the first person singular of the ________ tense.3. The opposite of "expensive" is ________.4. A noun is a word that represents a ________, ________, or ________.5. The plural form of "child" is ________.6. The correct form of "I" in the possessive case is________.7. "She ________ to the store yesterday" is an example of the simple past tense.8. The contraction for "they are" is ________.10. The prefix "un" means ________.11. "Read" and "write" are examples of ________ verbs.12. "I have two ________ and three ________" shows the use of plural nouns.13. The word "________" is used to connect two independent clauses.14. "________" is the question word used to ask for the reason.15. "________" is the past participle form of "do".16. "I am ________ to see you" is a positive sentence using an adjective.17. The opposite of "hot" is ________.18. "________" is the correct form of "be" in the present tense for "he".19. "I ________ a book" is the correct form to express possession.20. "________" is the correct form of "we" in the objective case.四、简答题：1. What is the difference between "its" and "it's"?2. Explain the difference between a regular and an irregular verb.5. What is a preposition and give three examples.6. Describe how to use the simple future tense correctly.7. What is the difference between "affect" and "effect"?8. How do you identify the subject and predicate in a sentence?9. What is an adverb and how does it differ from an adjective?10. Explain the concept of subjectverb agreement.一、选择题答案：1. A2. B3. A4. A5. D6. B7. C8. B9. A10. A二、判断题答案：1. √2. √3. √4. √5. √6. ×7. ×8. √9. √10. ×三、填空题答案：1. ate2. present3. cheap4. person, place, thing5. children6. mine7. went8. they're9. go10. not11. transitive12. cats, dogs13. and14. why15. done16. happy17. cold18. is19. have20. us四、简答题答案：1. "Its" is a possessive pronoun showing ownership, while "it's" is a contraction of "it is" or "it has".2. Regular verbs form their past tense and pastparticiple adding ed to the base form, while irregular verbs change their form in various ways.3. Commas are used to separate elements in a list, to set off nonrestrictive clauses, and to separate coordinate adjectives.4. Comparative is formed adding er or using "more" before the adjective, and superlative is formed adding est or using "most" before the adjective.5. A preposition shows the relationship between a noun or pronoun and other words in the sentence. Examples: in, on, under.6. The simple future tense is formed with will/shall + base verb and is used to talk about future actions or intentions.8. The subject is the person or thing that performs the action, and the predicate is the part of the sentence that tells what the subject does or is.9. An adverb modifies a verb, adjective, or other adverb and often ends in ly. It differs from an adjective, which modifies a noun.10. Subjectverb agreement means that the subject and verb must agree in number and person.Vocabulary: Nouns (plural forms), verbs (regular and irregular), adjectives (opposites), and prefixes.Syntax: Sentence structure (subject, predicate), clause types (independent, dependent), and question formation.各题型知识点详解和示例：选择题： Assess understanding of vocabulary, grammar rules, and sentence structure. Example: Identifying the correct tense usage.判断题： Evaluate knowledge of grammar rules and vocabulary usage. Example: Recognizing possessive pronouns.填空题： Test ability to apply grammar rules and vocabulary knowledge. Example: Filling in the correct past tense form of a verb.简答题： Measure the ability to explain and understand grammatical concepts. Example: Explaining the difference between adjectives and adverbs.。

第四单元封建时代的亚洲国家一、选择题(每小题4分，共48分)1．本州中部兴起的大和政权统一日本是在( )A．1世纪B．2世纪C．3世纪D．5世纪2．大化改新中规定，废除一切私地、私民，将土地、部民收归国有，成为公地、公民。

它属于什么方面的改革措施？( )A．政治B．思想C．文化D．经济3．历史上大和统治者通过派遣使臣和留学生，积极学习中国隋唐封建制度，并通过大化改新，在日本建立了( )A．民主政治B．中央集权制的封建国家C．奴隶制共和国D．资本主义制度4．某人于7世纪末去日本，不可能见到的现象是( )A．很多部民在贵族的庄园里劳动B．地方由中央派官治理C．国家权力集中于天皇D．很多人从中国长安留学归来5．日本发展成为一个中央集权制封建国家的标志性事件是( )A．大和统一日本B．大化改新C．幕府统治建立D．武士集团的出现6．大化改新百余年后，地方豪强把自己家族和仆从中的青壮男子武装起来，组成一种血缘关系和主从制相结合的军事集团，成员称为“武士”。

这样做的主要目的是( ) A．参与皇室斗争B．保卫天皇C．保护自己的庄园D．为国家提供兵役服务7．日本幕府统治集团的统治基础是( )A．天皇B．将军C．大名D．武士8．7世纪初诞生于阿拉伯半岛并见证了阿拉伯半岛的统一的宗教是( )A．佛教B．伊斯兰教C．道教D．基督教9．下列关于阿拉伯半岛统一的史实，表述有误的一项是( )A．穆罕默德最初在麦加城传教B．622年率领一些信徒迁居麦地那C．630年，穆罕默德率穆斯林占领麦加D．622年阿拉伯半岛基本统一10．阿拉伯数字是阿拉伯人对世界文化的独特贡献。

其中阿拉伯数字的发明者是( ) A．古印度人B．古埃及人C．古巴比伦人D．阿拉伯人11．相传古代印度与中国之间有一个萨桑王国，国王山鲁亚尔生性残暴、嫉妒心强。

他每日娶一少女，翌日晨即杀掉。

宰相的女儿山鲁佐德为拯救无辜的女子，自愿嫁给国王。

她用讲述故事的方法吸引国王并使之弃恶从善。

人教版九年级英语第四单元综合练习题（含答案解析）Ⅰ. 单项选择1.—What's the matter with you? Why do you keep ________ for long?—I feel sick and don't want to say anything.A.healthyB. warmC. silentD. bored2. You needn't do all the housework ________. You can let your families help you.A. in personB. for yourselfC. at leastD. for example3. My parents ________ go to visit my grandparents these days because they are too busy, so they feel very sorry.A. usuallyB. alwaysC. all the timeD. seldom4. Our teachers often require us ________ for our dreams.A. studyB. studyingC. studiedD. to study5. My classmate Li Jun saved a kid who feel into a river last Saturday. We ________ him.A. take pride ofB. take pride inC. be proud inD. be pride in6. My son ________ lazy, but he has been hard-working since he became a middle school student.A. used beB. use to beC. used to beD. is used to be7.You can talk about it with your father. He knows how to ________ all kinds of problems.A. give upB. make upC. agree withD. deal with8. Could you please ________ my baby while I'm cooking?A. take out ofB. take care ofC. take part inD. take away from9.—________ you ________ go to school by bike?—Yes. But now I usually go to school by bus.A. Did; use toB. Were; used toC. Do; use toD. Will; use to10. It ________ two months since I ________ my hometown.A. was; leaveB. was; leftC. has been; leaveD. has been; leftⅡ. 完形填空Last Friday, I met an old friend of mine in the supermarket. We haven't seen each other __1__ three years ago. She has __2__ a lot. She __3__ very fat and always __4__ a pair of glasses. But now, she is very thin and the glasses are gone. She __5__ so beautiful with big eyes and long blond hair—it used to be short and brown. She used to be very silent and was __6__ of speaking in public. Now she is humorous and she told me she was __7__ her school volleyball team and played __8__ piano. She said she hoped I could go to see her performance __9__. She looks so confident and I know she isn't what she used to be __10__.1.A. in B. for C. since D. with2. A. changed B. been changed C. turned D. become3. A. used to B. was used to be C. used to be D. was used to being4.A. wear B. wore C. put on D. dressed5. A. sounds B. was like C. looks D. looked6.A. afraid B. fond C. ready D. dare7. A. with B. for C. at D. on8. A. the B. a C. / D. some9. A. every day B. sometimes C. some day D. some time10. A. no more B. no longer C. not anymore D. anymoreⅢ. 阅读理解Chen Yujie, 15, studies at a boarding school in Ningbo, Zhejiang. __1__ It was not a short ride home and the trips were tiring. Chen hoped her parents could put the money on a bank card, so she didn't have to travel so often.__2__ “It's usually the most relaxing time for our family，”said Chen.She chose the right time. After a few turns of lobbying(游说), her parents finally agreed with Chen. __3__ So they have to choose a right time.US magazine Highights recently surveyed 1,521 kids aged 6－12 in the country, asking questions like “__4__ ”Results show that American kids seem to know when their parents are most receptive(乐于接受的). Meal time is discovered to be their most favorite time to talk to their parents. Bed time comes second, followed by time spent in the car.Chinese teenagers seem to have a similar tendency(倾向) over the problem. Qianjiang Daily, a newspaper in Zhejiang, did a survey about it. __5__ So do you have anything to talk to your parents about? Choose a good time.根据短文内容，从方框中选出五个句子填入文中空缺处，使短文内容完整正确。

浙教版数学九年级上册第四章相似三角形一、选择题1．如果2a =5b ，那么下列比例式中正确的是（ ）A ．a b =25B ．a 5=2b C ．a 2=b 5D ．a 5=b 22．如图，直线l 1∥l 2∥l 3，AC =6，DE =3，EF =2，则AB 的长为（ ）A ．3B ．125C ．165D ．1853．如图，点P 是线段AB 的黄金分割点，且PA >PB ，若AB =2，则PA 的长度是（ ）A ．5−1B ．3−5C ．25−4D ．14．如图， 在▱ABCD 中， E 是边AB 上一点， 连结AC ，DE 相交于点F ． 若AE EB =23，则 AF CF 等于（ ）A ．13B ．23C ．25D ．355．如图，小正方形的边长均为1，则图中三角形（阴影部分）与△ABC 相似的是（ ）A ．B ．C．D．6．△ABC和△DEF是两个等边三角形，AB=2,DE=4，则△ABC与△DEF的面积比是( ) A．1：2B．1：4C．1：8D．1:27．如图，在△ABC中，BC=6,AC=8,∠C=90°，以B为圆心，BC长为半径画弧，与AB交于点D，再分别以点A，D为圆心，大于12AD的长为半径画弧，两弧交于点M，N，作直线MN，分别交AC，AB于点E，F，则AE的长度为( )A．52B．103C．3D．228．如图，△ABC和△A1B1C1是以点O为位似中心的位似图形，点A在线段O A1上，若OA:A A1=1:2，则△ABC和△A1B1C1的周长之比为（ ）A．1:2B．2:1C．1:3D．3:19．如图，在△ABC中，D为线段AC上一点，点E在AC的延长线上，过点D作DF∥AB交BC于点F，连结BE,EF，若A C2+D E2=A E2，则△BEF与△DCF的面积比为（ ）A．1:2B．1:3C．2:3D．2:510．如图，矩形ABCD中，AB=4，AD=2，E为边AD上一个动点，连接BE，取BE的中点G，点G绕点E逆时针旋转90°得到点F，连接CF，则△CEF面积的最小值是（ ）A ．4B ．154C ．3D ．114二、填空题11．如图，AC 、BD 交于点O ，连接AB 、CD ，若要使△AOB ∽△COD ，可以添加条件 ．(只需写出一个条件即可)12．已知△ABC ∽△DEF ，且AB:DE =1:3，△ABC 与△DEF 的周长比是 ．13．如图，在这架小提琴中，点C 是线段AB 的黄金分割点（BC >AC ）．若AB =60cm ，则BC =　cm ．14．如图，在Rt △ABC 中，∠ABC =90°，AB =4，AC =5，AE 平分∠BAC ，点D 是AC 的中点，AE 与BD交于点O ，则的值AOOE ．15．如图，矩形ABCD 中，AB ＝3 6 ，BC ＝12，E 为AD 中点，F 为AB 上一点，将△AEF 沿EF 折叠后，点A 恰好落到CF 上的点G 处，则折痕EF 的长是 ．16．如图，正方形ABCD 中，BF =FG =CG ，BE =2AE ，CE 交DF 、DG 于M 、N 两点，有下列结论：①DF ⊥EC ；②S △MFC =59S 四边形MFBE ；③DM ：MF =2：1；④MN NC =913．其中，正确的有　　．三、解答题17．（1）已知线段a =2，b =6，求线段a ，b 的比例中项线段c 的长．（2）已知x ：y =3：2，求2x−yx的值．18．如图，已知D 、E 分别是△ABC 的边AB 、AC 上的点，DE ∥BC ，AD BD =32，求DE BC 的值．19．如图，AD 、BC 相交于点P ，连接AC 、BD ，且∠1=∠2，AC =6，CP =4，DP =2，求BD 的长．20． 如图，在平行四边形ABCD 中，E 为DC 边上一点，∠EAB =∠EBC ．（1）求证：△ABE∽△BEC ；（2）若AB=4，DE=3，求BE的长．21．如图，在四边形ABCD中，OA=OC，OB=OD，AB=BC，AC=12，BD=16．（1）求证：四边形ABCD时菱形；（2）延长BC至点M，连接OM交CD于点N，若∠M=12∠BAC，求MNOM．22．如图，AB∥CD，且AB=2CD，E是AB的中点，F是边BC上的动点（F不与B，C重合），EF与BD相交于点M．（1）求证：△FDM∽△FBM；（2）若F是BC的中点，BD=18，求BM的长；（3）若AD=BC，BD平分∠ABC，点P是线段BD上的动点，是否存在点P使DP⋅BP=BF⋅CD，若存在，求出∠CPF的度数；若不存在，请说明理由．23．如图，在平面直角坐标系中，已知抛物线y=12x2+bx+c与x轴交于A、B两点，与y轴交于C点，且OB=OC=4．（1）求抛物线的解析式；（2）在抛物线上是否存在点M，使∠ABC=∠BCM，如果存在，求M点的坐标，如果不存在，说明理由；（3）若D是抛物线第二象限上一动点，过点D作DF⊥x轴于点F，过点A、B、D的圆与DF交于E点，求△ABE的面积．答案解析部分1．【答案】D2．【答案】D3．【答案】A4．【答案】C5．【答案】B6．【答案】B7．【答案】A8．【答案】C9．【答案】A10．【答案】B11．【答案】∠A=∠C(答案不唯一)12．【答案】1:313．【答案】(305−30)14．【答案】9415．【答案】21516．【答案】①④17．【答案】（1）解：∵线段a=2，b=6，线段c是线段a、b的比例中项，∴c2=ab=12，∴c=23（负值舍去）；（2）解：∵x：y=3：2，∴可设x=3k，y=2k(k≠0)，∴2x−yx=6k−2k3k=43．18．【答案】3519．【答案】BD=320．【答案】（1）证明：∵平行四边形ABCD，∴AB//CD，∴∠EBA=∠BEC，又∵∠EAB=∠EBC，∴△ABE∽△BEC．（2）解：∵四边形ABCD 平行四边形，∴AB =DC =4，∵DE =3，∴CE =1，∵△ABE∽△BEC ，∴AB EB =EBEC，∴AB ⋅CE =B E 2=4×1=4，∴BE =2．21．【答案】（1）证明：∵ 在四边形ABCD 中，OA=OC ，OB=OD∴ 四边形ABCD 是平行四边形 ∵ AB=BC∴ 平行四边形ABCD 是菱形。

《自然界的水》单元检测题一、单选题1．芒果中含有芒果苷（化学式为C19H18O11），芒果苷具有使中枢神经系统兴奋的作用，并具有抗糖尿病、抗病毒等活性。

下列关于芒果苷的说法错误的是（）A. 由三种元素组成B. 相对分子质量为422gC. 质量分数最大的是碳元素D. 该分子中氢、氧原子个数比为18：112．下列物质的用途中，主要利用其物理性质的是A. 用生石灰做干燥剂B. 用氢气制造燃料电池C. 用铜丝制作导线D. 用稀盐酸除去水垢3．我国科学家用滤纸和二氧化钛（TiO2）薄膜制作出一种新型“纳米纸”，又在纳米纸上“铺”一层“萘胺”（C10H9N）染料，制成一种试纸，用于检测食品中亚硝酸盐浓度的高低。

下列说法正确的是（）A. 这种试纸是一种新型化合物B. 萘胺中C、H、N的质量比为10:9:1C. 二氧化钛和萘胺都是有机物D. 二氧化钛是氧化物4．如图是微信热传的“苯宝宝表情包”，苯(化学式为C6H6)是一种重要的化工原料，下列有关苯的说法不正确的是A. 苯属于有机物B. 苯由6个碳原子和6个氢原子构成C. 苯由碳、氢两种元素组成D. 苯中碳元素的质量分数约为92.3%5．CO32﹣中碳元素的化合价为（）A. ﹣2B. +2C. +4D. +66．化学用语图像往往能蕴含许多信息，从下列图示可以了解的信息中，其中正确的A. 甲图是氟原子的结构示意图B. 丁图表示+1价的钠元素C. 由乙图可知一个氩原子的质量为39.95D. 若“○”表示1个氯原子，则丙图表示2个氯原子7．C22H19FN4O2为抗癌新药西达苯胺的化学式。

下列关于西达苯胺的说法正确的是A. 西达苯胺是一种有机物B. 西达苯胺由碳、氢、氧、氮四种元素组成C. 西达苯胺中碳元素和氮元素的质量比为11：2D. 西达苯胺各元素的质量分数中氧元素的质量分数最小8．工业酒精中含有甲醇(如图)，关于甲醇的下列叙述正确的是( )A. 甲醇是由 1 个碳原子、4 个氢原子和 1 个氧原子构成的B. 甲醇中碳、氢元素的质量比为 1：4C. 甲醇属于氧化物D. 甲醇中氢元素的质量分数最小9．下列化学用语表示正确的是A. 钙离子：Ca+2B. 2个氢原子：H2C. 氧化钠中氧元素化合价：Na2O D. 3个氯分子：3Cl210．关于电解水实验的下列说法中正确的是A. 从现象上判断:正极产生的是氢气B. 从变化上分类:该变化属于物理变化C. 从宏观上分析:水是由氢气和氧气组成的D. 从微观上分析:水分子是由氢原子和氧原子构成的11．下列有关水的说法不正确．．．的是A. 水质浑浊时可加入明矾使悬浮杂质沉降除去B. 水的硬度较大时可用过滤的方法降低水的硬度C. 水中有异味时可加入活性炭除味D. 可用蒸馏的方法将自来水进一步净化12．下列属于纯净物的是（）A. 鲜花饼B. 小锅米线C. 果汁D. 水13．下列属于化学变化的是（）A. 木柴燃烧B. 酒精挥发C. 水变成冰D. 铁水铸成锅二、填空题14．在宏观微观与符号之间建立联系，是化学学科的特点。

九年级（上）语文第四单元综合测试题附答案一、基础大课堂（共30分）1．阅读下面一段话，给加点字注音并根据拼音写出汉字。

（6分）我喜欢读各种风格的散文，喜欢鲁迅的深沉冷jùn( )、巴金的自然真挚、茅盾的淳．（）厚质朴、冰心的婉约清秀、也喜欢林语堂的幽默juàn ( )永、徐志摩的浓艳绮．（）丽、汪曾祺的恬．( )淡纯净、秦牧的博识ruì( )智……2．下列各句没有语病的一项是（2分）（）A．国家重点新产品计划是一项激励企业自主开发新产品，推动科技成果转化及产业化效益突出。

B．改革开放以来，江苏的文化艺术呈现出百花齐放、异彩纷呈、团结繁荣的生动景象，整体实力和影响力不断更新。

C．不仅我们看到海南独特的热带自然风光，而且看到了山水背后蕴藏的文化内涵。

D．为响应教育部、国家体育总局关于“全面启动全国亿万学生阳光体育运动”的号召，4月30日上午8点，我校在操场隆重举行阳光体育运动启动仪式。

3.下列各句加点成语使用不当的一项是（2分）A.那位老人选择木鱼作为卖馄饨的信号真是别．具匠心．．．。

B.我感到不幸的理由总是多于欢乐的理由，就像眼泪比笑声更容易刻骨铭心．．．．，流血比流汗更令人难忘。

C.看到他的滑稽的表情，我忍俊不禁．．．．地扑哧一声笑了起来。

D.朋友之间意见不合时，不要斤斤计较．．．．，应该以积极开朗、从容淡定的态度对待生活。

4. 根据语境，仿照画线句子，接写两个句子，构成语意连贯的一段话。

（2分）希望，吹动了梦想的风铃；希望，；希望，。

希望，一个多么阳光的词语，它是一位智者，给了我们一把钥匙，去开启我们的希望之门。

5．名句默写（6分）（1）法不阿贵，。

《韩非子·有度》（2），来者犹可追。

《论语·微子》（3）盛名之下，。

《后汉书·黄琼传》（4）小时候，，我在这头，母亲在那头。

《乡愁》（5）我国古诗词中抒写“乡愁”的诗句灿若星辰，请你写出连续的两句。

Unit 4单元测试题满分：100分时间： 90分钟一、根据句意和首字母提示补全单词。

(10分)1.Our teacher is very h ,he often tells us funny jokes.2.Lily’s teacher asked her parents to talk to her in p .3.If you are always a from class,you will fail the examinations.4.Kate’s grandparents have had a great i on her,so she is like her grandmother in many ways.5.—Paul used to be really quiet,didn’t she?—Yes. She was always s in class.6.I asked my teacher for help and he gave me a lot of h books.7.We are all p of our motherland.8.—Do you like see a movie on your mobile phone?—No.I s do that because it makes me uncomfortable.9.Finally,he made a d to tell us the secret.10.She is very shy,she doesn’t d to make a speech in public.二、用所给单词的适当形式填空。

（10分）1.She is not strong enough (go) walking up ountains.2.When I walked past the park,I saw some old pople (do) Chinese Kongfu.3.Don’t give up (study) hard. Because you are a good student.4.He was no longer interested in (study).5.Finally,his parents made a decision (send) him to a boarding school.6.He has been working hard and is now one of (good) student in his class.7.My life (change) a lot in the last few years.8.At last, he made an important (decide).9.I’m afraid of (fly) in the airplane.10.He didn’t dare (speak) in front of the people.三、根据汉语，完成英语句子。

九年级上册第四单元测试卷附答案九年级上册第四单元测试卷（附答案）一、基础知识及运用。

(共20分，每小题2分)1.请把下句诗用正楷或行楷工整地写在方格内：清风明月无价远山近水有情2.下面四字短语中的有六个错别字，请找出来并加以改正。

格物致知推之四海传之万世不知所措袖手旁观前扑后继怀古伤今精兵简正肆无忌掸接踵而致情系中华一番风顺埋头苦干自欺欺人3.下列词语中加点词的意思不合句意的一项是( )A.这就是中国的脊梁。

(不屈不挠,不断奋斗的中国人)B.必须不被搽在表面的自欺欺人的脂粉所诓骗。

(比喻国民党反动报刊上的欺骗宣传。

)C.自信力的有无，状元宰相的文章是不足为据的，要自己去看地底下。

(指土地下面。

)D.一到求神拜佛,可就玄虚之至了。

(无法捉摸,飘忽不定)4.下列各句中“中国人”的含义与其他三项不同的一项是( )A.于是有人慨叹曰:中国人失掉自信力了。

B.中国人现在是在发展着“自欺力”。

C.假使这也算一种“信”,那也只能说中国人曾经有过“自信力”。

D.如果单据这一点现象而论,中国人的自信其实是早就失掉了。

5.选择恰当的一组词语填空读史使人，读诗使人，数学使人，科学使人，伦理学使人，逻辑修辞之学使人，总之，“凡有所学皆成性格”。

A.聪明深刻精密高尚有道德善辩B.明智灵秀周密深刻庄重善辩C.高尚明智聪慧深刻有修养巧辩D.深刻高尚聪慧明智有修养巧辩6.下列句子中，不是病句的一项是 ( )A.因为我们不能盲目地接受过去认为的真理，所以也不能等待“学术权威”的指示。

B.在环境激变的今天，应该重新体会几千年前经书里说的格物致知的真正意义。

C.这可能是因为传统教育的目的并不是寻求新知识，并且是使人适应一个固定的社会制度。

D.实验不是毫无选择的测量，它需要具体细致的计划。

7.下列是有关读书或学习的名句，请在画线处默写填空。

⑴ ，思而不学则殆。

⑵好读书，不求甚解，，便欣然忘食。

⑶敏而好学，。

8.根据下面提供的信息拟一个标题。

初中化学《九上》第四单元自然界的水《爱护水资源》考试练习题姓名:_____________ 年级:____________ 学号:______________1、2021年 3月 22日是第 29个世界水日，今年的主题是“珍惜水、爱护水”。

下列对于水的认识正确的是A ．用废水浇灌农田以降低成本B ．使用无磷洗涤剂减少水体污染C ．利用活性炭可以软化硬水D ．经自来水厂处理后的生活用水是纯净物知识点：爱护水资源【答案】B【详解】A 、废水中含有大量的污染物，会污染土壤，不符合题意；B 、使用无磷洗涤剂，可以减少水体富营养化，减少“ 水华” 现象的发生，保护水资源，符合题意；C 、活性炭只能吸附水中的色素和异味，不能除去可溶性杂质，不能软化硬水，不符合题意；D 、自来水处理后的生活用水中还含有可溶性杂质，属于混合物，不是纯净物，不符合题意。

故选B 。

2、写出一种节约用水的方法 ___________，区别硬水和软水的方法是加 ___________，生活中常用___________的方法降低水的硬度。

知识点：爱护水资源【答案】用淘米水浇花肥皂水煮沸【详解】节约用水的方法有用淘米水浇花、用洗菜水拖地等；区别硬水和软水的方法是加肥皂水，若有大量的泡沫产生，说明是软水，泡沫少或者没有泡沫产生，浮渣多的是硬水；生活中常用煮沸的方法降低水的硬度。

故填：用淘米水浇花；肥皂水；煮沸。

3、水是人类的宝贵资源， 2020年“世界水日”和“中国水周”活动的宣传主题为“坚持节水优先，建设幸福河湖”。

(1)“坚持节水优先，建设幸福河湖”主要从节约用水做起，请你写出一条节约用水的措施： _______(2)含有较多可溶性钙、镁矿物质的天然水称为硬水。

生活中常用 _______来检验水的硬度。

生活中为了降低水的硬度并杀菌、消毒，可采用的方法是 _______。

(3)实验室可以通过电解水的实验来探究水的组成 (如图是电解水的实验装置图 )。