1-3单元要点答案
初中化学1-3单元知识默写版（有答案版）--空白版
初中化学1-3单元知识默写版（有答案版）--空⽩版初中化学知识点1-3单元知识汇总默写版绪论1、我国劳动⼈民_________会制造青铜器， __ ____时会炼铁、炼钢。
2、近代，经过 _________ 和_________等科学家的研究，得出⼀个重要的结论：物质是由 _________和_________构成的，分⼦中原⼦的重新组合是化学变化的基础。
_________和 _________ 的创⽴，奠定了近代化学的基础。
3、1869年门捷列夫发现了 _________并编制出_________使化学的学习和研究变得有规律可循。
4、化学的定义：化学是在、层次上研究物质的、、与的科学。
5、近年来，的提出，使更多的化学⼯艺和产品向着环境友好的⽅向发展。
第⼀单元⾛进化学世界课题1 物质的变化和性质1、化学变化的特征是。
常表现为、、等。
2、⽔变成⽔蒸⽓，块状胆矾研碎都是变化，因为它们虽然改变了，但没有⽣成。
3、⽯灰⽯与盐酸反应和⼆氧化碳使⽯灰⽔变浑浊，都有产⽣，所以都属于变化。
4、化学变化不但⽣成其他物质，⽽且还伴随着的变化，这种能量变化常表现为、、等5、在物质发⽣化学变化时，同时发⽣变化。
如点燃蜡烛时，蜡烛熔化属于变化，蜡烛燃烧属于变化。
6、物质在化学变化中表现出来的性质叫做，如、等。
7、物质不需要发⽣化学变化就能表现出来的性质叫做，如、、、、、、等。
8、当外界条件改变时，物质的性质也会随着变化，因此，描述物质性质时往往要注明。
9、⼈们把101 K Pa 规定为。
课题2 化学是⼀门以实验为基础的科学1、化学是⼀门以为基础的科学。
许多的化学重⼤发现和研究成果都是通过得到的。
2、学习化学的⼀个重要途径是，通过实验以及对的观察，记录和分析，可以发现和验证，学习的⽅法并获得。
3、在化学学习中进⾏科学探究活动时，应关注物质的，关注物质的，关注物质的。
4、蜡烛燃烧实验(1)⽯蜡⽔，⽯蜡密度⽔。
(2)蜡烛燃烧时的⽕焰分三层，包括（温度最⾼）、（最明亮）和（最暗）。
21世纪大学英语读写教程第二册课后练习答案(1-3单元)
21世纪大学英语读写教程第二册课后练习答案（1-3单元）第一单元Text ComprehensionII．1. It was a military campaign in which many soldiers died. The effects on Churchill were () he lost h is political position and he was overwhelmed with grief.2. He felt so inspired to paint that he wasdistracted from his personal problems.3. His sister-in-law’s painting inspired hi m to try his hand at it; his wife rushed out to buy all th e materials he would need; and the wife of Sir John Laveryhelped him overcome his fear of the blank canvas.4. The blank whiteness of the canvas made h im feel he didn’t know where to begin. This nervousness wa s not typical of Churchill, who was known publicly as a brave and strong-willed person.5. Churchill was comparing the canvas to an opponent in a fight, and he could now see that he need not fear his “adversary”.6. He meant that Churchill would have beena great painter, just as he was a great politician.7. It was his great comfort when the death of his mother was followed quickly by the death of his daughter.8. Because the judges suspected that it was not painted by an amateur; they were later surprised and delighted because Churchill was not just a famous politica l figure but also a talented untrained artist.9. No, she considers that decade an artistically fruitful one.10. He meant that painting was like a friend who ne ver betrayed or abandoned him. This seems to suggest that he often felt lonely, misunderstood and/or disappointed in his relationship with other people.VocabularyIII.1.artistic2.overcome3.infinite4.plunged 5.mission 6.camgpain 7.revived 8.distract 9.accustomed 10.retreat 11.precaution 12. disastrousIV.1. delighted with2. bore fruit3. kept Clementine company 4. rely on5. take refuge6. awaken people to7. pay the price 8. chanced upon; dated from9. tried his hand at 10. fell upon; came to her rescueWord BuildingV.1. broadens the mind2. weakened3. sweeten Diet Coke 4.hardens 5. strengthen6. deepen your understanding of the course materiall7.sharpen the kitchen knives8. reddened 9. brighten; quickens 10. lightenedVI.1. lucky2. wealthy3. tasty4. icy5. wavy6. smelly7. sleepy8. noisy (smelly is also p lausible)9. healthy 10. sunnyStructureVII.1. Amazed at the great changes that are tak ing place in shanghai, many foreign visitors leave China w ith a completely new view of our country.2. Unpleasantly startled by the appearance of a mouse, we promptly decided to clean our apartment.3. Tired of their own cooking, they’ve decided to go to a restaurant for a change.4. Frightened by the horror film, the little girl was alert to every sound in the house that night.5. Deeply dis appointed with the actress’s performance, tom soon switched to another channel.6. Embarrassed about still being in bed at10 a.m., when my friends came I pretended to be sick witha terrible headache.VIII.1. So I did2. So did my brother3. So she was 4. So they do; so do his classmates 5. So am IClozeIXlonely; overcame; refuge; finally; however; where; deli ghted; contemplated; entry; campaign; distract; plunged in to; Within a month; rescue; when; overwhelmingTranslationX.“‘在画画呢!’她大声说道。
人教版英语七年级上册预备单元1-3单元翻译句子、句型转换(含答案)
人教版英语七年级上册预备单元1-3单元翻译句子、句型转换（含答案）一、翻译句子。
Unit 1 Good morning !1、早上好，爱丽丝. ___________ ____________ , Dale.2、下午好，陈老师。
____________ ___________ , Miss Chen.3、晚上好，鲍勃。
____________ ___________ , Bob.4、你好，弗兰克。
_________ \ __________ , Frank5、戴尔，你好吗？__________ _________ __________ , Dale?6、我很好，谢谢。
I’m ___________ , ___________ __________ \ _________7、你好。
__________ do you __________.8、Tom好吗？__________ __________ Tom ?9、他们好吗？_________ __________ they?Unit 2 What’s this in English?1、这个用英语怎么讲？\ 这个用英语如何表达）？__________ this __________ ___________ ?或者__________ ___________ this __________ ___________ ?2、那是什么？__________ ___________ ? 或者_________ _______________?3、这是什么？__________ ____________ ? = What is this ?4、它是一个橘子。
________ _________ __________ orange.5、它是一件夹克衫。
________ _________ a jacket. =__________ a jacket.6、那个用英语怎么说？\ 那个用英语怎么表达？What’s __________ in ___________ ? = What _________ _________ __________ English?7、请拼写它。
人教版英语七年级上册Starter units1-3单元知识点总结归纳及同步练习题(附答案)
人教版英语七年级上册Starter units1-3单元知识点总结归纳及同步练习题（附答案）Starter Unit1 Good morning.1. 早上（上午）/下午/晚上好。
Good morning/afternoon/evening.答语也相同。
在熟人或家人之间可省略good。
熟人之间的问候可加上称呼语，称呼语放在问候语之后且用逗号隔开。
如：Good morning , class!同学们，早上好！Good night!晚安（晚间告别用语）2. Hello, Frank! 你好，弗兰克。
3. A: How are you? 你（身体）好吗？B:(I’m) fine/Very well/I’m OK. Thank you./Thanks. How are you? / And you?我很好。
谢谢。
你呢？A: (I’m) fine/OK, too. 我也很好。
4.thanks = thank you 谢谢5.HB（铅笔芯）硬黑 CD光盘BBC英国广播公司Starter Unit2 What’s this in English?1. What’s this/that? 这/那是什么？It’s a/an + 单数物品（△不说This/That is．．．）1)—What’s this/that? 这/那是什么？—It’s a ruler. （这/那是）直尺。
2)—What’s this/that? 这/那是什么？—It’s an apple. （这/那是）苹果。
2. What’s this/that in English? 这/那用英语怎么说？It’s a/an + 单数物品（△不说This/That is．．．）What’s this in English? 这用英语怎么说？It’s a jacket. 夹克衫What’s that in English? 那用英语怎么说？It’s an orange. 橘子。
新视野大学英语第二册(第三版)1-3单元课后练习答案
Text A3 1.condense 2.exceed 3.deficit 4.exposure 5.asset 6.adequate petent 8.adjusting 9.precisely 10.beneficial5 1. editorial 2. recovery 3. accuracy 4. substance 5. managerial 6. margin 7. assembly 8. Ministry 9. survival 10. tradition 11. consistency 12. efficient6 1.L 2. C 3.J 4.A 5.I 6.O 7.N 8.E 9.H 10.F7 1.feel obliged to 2.be serious about 3.run into 4.distinguish between 5.thrust upon 6.was allergic to 7.get lost 8.be attracted to 9.make sense 10.looked upon as 9人们普遍认为英语是一种世界语言，经常被许多不以英语为第一语言的国家使用。
与其他语言一样，英语也发生了很大的变化。
英语的历史可以分为三个主要阶段：古英语，中古英语和现代英语。
英语起源于公元5世纪，当时三个日耳曼部落入侵英国，他们对英语语言的形成起了很大的作用。
在中世纪和现代社会初期，英语的影响遍及不列颠群岛。
从17世纪初，它的影响力开始在世界各地显现。
欧洲几百年的探险和殖民过程导致了英语的重大变化。
今天，由于美国电影、电视、音乐、贸易和技术、包括互联网的大受欢迎，美国英语的影响力尤其显著。
10Chinese calligraphy is a unique art and the unique art treasure in the world. The formation and development of the Chinese calligraphy is closely related to the emergence and evolution of Chinese characters. In this long evolutionary process, Chinese characters have not only played an important role in exchanging ideas and transmitting culture but also developed into a unique art form. Calligraphic works well reflect calligraphers' personal feelings, knowledge, self-cultivation, personality, and so forth, thus there is an expression that "seeing the calligrapher's handwriting is like seeing the person". As one of the treasures of Chinese culture, Chinese calligraphy shines splendidly in the world's treasure house of culture and art.补充翻译：Although many students seem allergic to English and always get lost in English learning, they still feel obliged to learn it well. Then how can teachers make students’ journey of English learning enjoyable? Effective, precise, and beneficial communication depends upon grammar and a good vocabulary. Thus, for the students with language deficit and should learn from scratch, it does make sense to teach them the essential framework of language, accurate grammar and proper vocabulary. Learning grammar and a good vocabulary is just like driving with a road map in a well-conditioned car. One should often study the road map (check grammar) and tune up the car engine (adjust vocabulary). Equipped with these two essential assets, students will surely become attached to English and have excellent control in their journey of English learning.Text B2 1.D 2.A 3.C 4.A 5.C 6.B 7.C D4 1.mysterious 2.desperate 3.devise 4.negotiate 5.recalled 6.specifically 7.depict 8.ignorance 9.expand 10.confusion5 1.apply to 2.in a bid to 3.end up 4.Speaking of 5.get hold of 6.appealed to7.Leaving… behind 8.focus on8 1.essential framework 2.proper vocabulary 3.excellent control nguage deficit 5.high standards nguage proficiency 7.acquire knowledge petent communication 9.overcome deficiencies 10.sketch thoughts 11.effective communication 12.advanced vocabularyText A3 1.promotes 2.accelerate 3.mystery 4.insight 5.boost 6.analysis 7.calculate 8.barriers 9.destruction 10.protest5 1.excess 2.bearing 3.objective 4.intensify 5.execute 6.promising 7.exclude 8. identity 9. offend 10.housing6 1.C 2. H 3.D 4.J 5.B 6.L 7.M 8.G 9.F 10.A7 1.are liable to 2.in favor of 3.is bound to 4.speculate about 5.invested… with 6.stand up for 7.in the form of 8.prepared for 9.in the company of 10.in succession9慕课是一种网络课程，它旨在通过网络实现广泛参与和开放接入。
units 1-3单元练习(含答案)
Units 1-3一、单选1. --- What’s the of the car at present? --- It’s about 70 kilometers an hour.A. placeB. speedC. priceD. mark2. --- How nice the fish tastes! Could you tell me who taught you to cook it?---To be honest, I learnt it watching TV. I learn to cook many dishes TV.A. by; inB. by; onC. in; onD. in; in3. --- Many women have to __________ their husbands for their livings .--- That may not be true . Many women choose to go out to work themselves .A．put on B. decide on C．depend on D．come on4. When you come across new words in reading, it is not a good idea to in a dictionary at once.A. make up themB. look up themC. make them upD. look them up5. --- What did Tina say? --- Sorry, I didn’t ________ what she said.A. pay attention toB. get on withC. hold on toD. look forward to6. --- I wonder if I can learn English well. ---________. All things are difficult before they are easy.A. I am afraid soB. You’re slowC. It takes timeD. It’s a piece of cake7. ---You look a bit worried . ---It’s raining , but I ________my umbrella at home .A. tookB. broughtC. leftD. forgot8. --- Can you spare time to come to our Thanksgiving party? --- Well, I don’t know ________A. that I can finish my work by thenB. if can I finish the work by thenC. that can I finish the work by thenD. whether I can finish the work by then9. My father wants to know _________ next week .A. when my uncle leavesB. when will my uncle leaveC. when my uncle will leaveD. when does my uncle leave10. ---I haven’t d ecided where to go. Do you have any good ideas ? --- I ________ that we go swimming .A. promiseB. agreeC. realizeD. suggest11. I wonder _______ you would like to come to my birthday party .A. thatB. whetherC. that whetherD. that if12. — Look at the photo I took in Jinghong, Yunnan Province. ____ the Dai people were having!— Wow! They were celebrating the Water Festival.A. What funB. How funC. What a funD. How a fun13. ---Could you tell me____ about Valentine’s Day in Japan?--- Well, not only adults but children celebrate it.A. somethingB. anythingC. everythingD. nothing14. --- I am going back to America for Thanksgiving Day. ---____. And we will miss you.A. Enjoy yourselfB. You’re welcomeC. That’s interestingD. The same to you15.---What do you think of him ? --- He is such a kind man that we all ________ him very much .A. absorbB. acceptC. attractD. admire二、阅读理解（A）Winter solstice, as the name shows, means the coming of winter. As an important solar term in the traditional Chinese calendar, it is also a traditional holiday for Chinese, which is also called “冬节”，“长至节”，“亚岁”, etc. Generally, winter solstice occurs between December 21st and 23rd. According to the traditional Chinese calendar, five days constitutes a pentad and three pentads constitute a solar term. One year is divided into twelve periods and twelve climates which are regarded as twenty-four solar terms. The Winter Solstice is one of twenty-four solar terms. On this day, in the Northern Hemisphere the period of daytime is the shortest of the year and the period of night is longest. . In Northern China during winter solstice there is a custom of eating dumplings.1. There are _________ solar terms in a year.A. twelveB. fiveC. twenty-fourD. thirty-one2. People often eat _________ during winter solsticeA. mooncakesB. dumplingsC. noodlesD. chicken3. Winter solstice is in __________.A. JanuaryB. SeptemberC. OctoberD. December4. On winter solstice the period of night is ________in China.A. the longestB. the shortestC. darkestD. brightest5. Which day has the longest daytime in China?A. The beginning of springB. Summer solsticeC. Grain fullD. The beginning of autumn（B）Life comes in a package. This package includes happiness and sadness, failure and success, hope and despair. Life is a learning process. Experiences in life teach us new lessons and make us a better person. With each passing day we learn to deal with various situations.Love plays a main role in our life. Love makes you feel wanted. Without love a person could become cruel. In the early stage of our life, our parents are the ones who show us with love and care. They teach us about what is right and wrong, good and bad. But we don’t always care about it. It is only after marriage and having kids that a person understands others’ feelings.Happiness can bring people a peaceful mind. No mind is happy without peace. Sadness is the cause of the death of a loved one or the failure. But all of these things will pass away.Failure is the path to success. It helps us to touch the sky, teaches us to survive and shows us a specific way. Success brings in money, pride and self-respect.Hope is what keeps life going. Parents always hope their children will do well. Hope makes us dream. Hope builds in patience. Life teaches us not to despair even in the darkest hour, because after every night there is a day.Life teaches us not to regret over yesterday, for it has passed and is out of our control. Tomorrow is unknown, for it could either be bright or dark. So the only choice is to work hard today, so that we will enjoy a better tomorrow.6. We usually have to accept if we want to be successful.A. loveB. failureC. sadnessD. hope7. In which section can readers probably read the passage?A. Business.B. Travel.C. Lifestyles.D. Education.8. What does the word “despair” mean in Chinese?A. 颓废B. 遗憾C. 悲伤D. 绝望9. What’s the meaning of the last sentence of the whole passage?A. When choosing between “today” and “tomorrow”, you’d better enjoy tomorrow.B. If you work hard today, you’ll have a better life in the future.C. What you can only choose is to work hard today rather than tomorrow.D. The only choice you make is that you should enjoy a better tomorrow.10. What’s the purpose of the passage?A. To encourage people to love each other.B. To tell people how to deal with happiness and sadness.C. To give readers some information about life.D. To remind people to keep having a beautiful dream.B卷一、根据首字母及句意补全单词，并将单词完整地写在答题卷相应题号后1.A______ comes after March and people like to play kind jokes on the first day of that month.2. People usually say dogs are good at k_______ their way home by their sense of smell.3. Our First Lady, Peng Liyuan is also a very famous Chinese f_____ singer.4.Tianfu Square is in the c______ part of our city.5.My cousin h_____ my dictionary behind the plant when I went out of my room for dinner.二、完成对话。
部编版八年级上册语文1-3单元古诗古文翻译及练习含答案
部编版八年级上册语文1-3单元古诗古文翻译及练习野望王绩东皋薄暮望，徙倚欲何依。
树树皆秋色，山山唯落晖。
牧人驱犊返，猎马带禽归。
相顾无相识，长歌怀采薇。
一释义⑴东皋（gāo）：山西省河津县的东皋村，诗人隐居的地方。
薄暮：傍晚，太阳快落山的时候。
薄，迫近。
《楚辞·天问》：“薄暮雷电，归何忧？厥jué严不奉，帝何求？”⑵徙倚（xǐyǐ）：徘徊，彷徨。
《楚辞·远游》：“步徙倚而遥思兮，怊惝恍而乖怀。
”依：归依。
⑶秋色：一作“春色”。
⑷落晖：落日的余光。
晋陆机《拟东城一何高》诗：“三闾结飞辔，大耋嗟落晖。
”⑸犊（dú）：小牛，这里指牛群。
⑹禽：鸟兽，这里指猎物。
⑺相顾：相视；互看。
南朝梁刘协《文心雕龙·知音》：“乃称史迁著书，咨东方朔，于是桓谭之徒，相顾嗤笑。
”⑻采薇：薇，是一种植物。
相传周武王灭商后，伯夷、叔齐不愿做周的臣子，在首阳山上采薇而食，最后饿死。
古时“采薇”代指隐居生活。
《诗经·召南·草虫》有：“徙彼南山，言菜其薇。
未见君子，我心伤悲。
”又《诗经·小雅·采薇》有：“采薇采薇，薇亦作止。
曰归曰归，岁亦莫止，靡市靡家，猃狁之故；不遑启居，猃狁之故。
”此处暗用二诗的句意，借以抒发自己的苦闷。
野望王绩东皋薄暮．．（徘徊，彷徨。
）欲何依．（归依）。
．．（傍晚）望，徙倚树树皆秋色，山山唯落晖．．（落日的余光）。
牧人驱犊．（小牛，这里指牛群。
）返，猎马带禽．（鸟兽，这里指猎物。
）归。
相顾．．（古时“采薇”代指隐居生活。
）。
．．（相视；互看）无相识，长歌怀采薇二、翻译傍晚时分站在东皋纵目远望，我徘徊不定不知该归依何方，层层树林都染上秋天的色彩，重重山岭披覆着落日的余光。
牧人驱赶着那牛群返还家园，猎人带着诸多猎物回归家园。
大家相对无言彼此互不相识，我长啸高歌真想隐居在山冈！三、练习题1、薄暮在诗中的意思是什么？（太阳将要落山的时候。
部编版小学语文四年级下册看拼音写词语1-3单元(附答案)
四下看拼音写词语1-3单元（附答案）第一单元fù zá xī shū lí bā lí luò qīng tíng hú dié sù shè（） ( ) ( ) ( ) ( ) ( )( )zhù sù shēng shū máo yán wū yán yú wēng yī lài bō duó（）( ) ( ) ( )( ) ( ) ( )miáo huì hé xié jì xìn shuì mián jié gòu shuài lǐng xún mì( ) ( ) ( )( ) ( ) （）（）gāo sǒng tà bù tǎng ruò zhuāng shì dūn zhe fènɡ xiān mì shí( ) ( ) ( ) ( ) ( ) （）（）shùn xù zhào lì jǔ lì huá lì dú tè mì shí tián mì mènɡ xiānɡ( ) ( ) ( )( ) ( )（）（）（）wèi jiè sǎo dànɡ wēi lì qí huàn zhān bǔ ruì lì hé tān( ) ( ) ( ) ( ) ( ) （）（）wén zhàng shǎn shuò biān fúè bà bà qì shí zú māo tóu yīng( ) ( ) ( )( ) ( ) （）qīng fēng xú lái sài wēng shī mǎ bié yǒu fēnɡ qù yuè mínɡ rén jìnɡ( ) ( ) ( )( )yìnɡ hèɡāo lóu lín lì chē shuǐ mǎ lónɡ dēnɡ huǒ huī huánɡ( ) ( ) ( ) ( )yī shān bànɡ shuǐ jī quǎn xiānɡ wén( ) ( )第二单元měi cān sōnɡ zhī fú shì huī chén huá dònɡ shǎnɡ wǔ shèn chū（）（）（）（）（）（）（）yān mò zhēnɡ zhá yì fān mái zài chōnɡ shuā duàn jué tuī cè（）（）（）（）（）（）（）xiánɡ xì qínɡ xínɡ kǒng lóng bèn zhòng chí dùn tán qǐɡē zi（）（）（）（）（）（）（）ɡēn jù mò qī suì dào qián zhī péng zhàng tóu lú niǎo yì（）（）（）（）（）（）（）kāi pì pī kāi tuō lí miáo huì shí dūn jù bèi nà mǐ（）（）（）（）（）（）（）yōng yǒu bīng xiāng dī tàn cái liào gāng tiě yǐn xíng jiàn kāng（）（）（）（）（）（）（）xì bāo jí bìng yù fáng bìng zào xū yào shēn kè chú chòu ɡōnɡ nénɡ（）（）（）（）（）（）（）（）shū cài sǐ wánɡ lǜ fān téng nù hǒu qián fǔ hòu yǎnɡ（）（）（）（）chénɡ qiān shànɡ wàn rè là là wú cǎi bān lán háo bù xiānɡɡān（）（）（）（）línɡ kōnɡáo xiánɡ xīn xǐ ruò kuáng cū zhuàng yǒu lì xíng tài gè yì（）（）（）（）diǎn jīnɡ zhī bǐ rú máo yǐn xuè nǎo lú pénɡ dà tiān zhī jiāo zǐ( ) ( ) ( )( ) wú néng wéi lì yán huánɡ zǐ sūn chánɡé bēn yuè bó bó shēnɡ jī( ) ( ) ( )( ) zhèn ěr yù lónɡ（）第三单元fán xīng téng luó bō tāo xī gài duǒ cáng chánɡ yánɡ zhāo xiá( ) ( ) ( ) ( ) ( ) （）（）mò lǜ nèn lǜ jí zhōng jiāo chā jiào liàn yōnɡ jǐ zhǐ huī( ) ( ) ( ) ( ) ( )（）（）zhěng qí jié pāi mò shuǐ píng bái huà mài suì xiāo sǎ méng lóng （）（）（）（）（）（）（）jì jìng máo róng róng xiù huā tú mǒ cāng cuì yù dī（）（）（）（）（）yǒng bù màn miè lǜ de chū qí shān shān lái chí bái xuěái ái ( ) ( ) ( ) （）jié bái de liú sū càn càn de jīn huī( ) ( )jīng liàng de xuě huā yín sè de guāng huá( ) （）四下看拼音写词语1-3单元（答案）第一单元fù zá xī shū lí bā lí luò qīng tíng hú dié sù shè（复杂） (稀疏 ) ( 篱笆 ) ( 篱落 ) ( 蜻蜓 ) ( 蝴蝶 )( 宿舍 )zhù sù shēng shū máo yán wū yán yú wēng yī lài bō duó（住宿） ( 生疏 ) ( 茅檐 ) ( 屋檐 ) ( 渔翁 ) ( 依赖 ) ( 剥夺 )miáo huì hé xié jì xìn shuì mián jié gòu shuài lǐng xún mì( 描绘 ) ( 和谐 ) ( 寄信 ) (睡眠 ) ( 结构 ) （率领）（寻觅）gāo sǒng tà bù tǎng ruò zhuāng shì dūn zhe fènɡ xiān mì shí( 高耸 ) ( 踏步 ) ( 倘若 ) ( 装饰 ) ( 蹲着 ) （凤仙）（觅食）shùn xù zhào lì jǔ lì huá lì dú tè mì shí tián mì mènɡ xiānɡ(顺序) ( 照例) ( 举例)( 华丽 ) (独特 )（觅食）（甜蜜）（梦乡）wèi jiè sǎo dànɡ wēi lì qí huàn zhān bǔ ruì lì hé tān ( 慰藉 ) ( 扫荡) ( 威力 ) ( 奇幻 ) ( 占卜 ) （锐利）（河滩）wén zhàng shǎn shuò biān fúè bà bà qì shí zú māo tóu yīng ( 蚊帐 ) ( 闪烁 ) ( 蝙蝠) ( 恶霸 ) ( 霸气十足) （猫头鹰）qīng fēng xú lái sài wēng shī mǎ bié yǒu fēnɡ qù yuè mínɡ rén jìnɡ( 清风徐来 ) ( 塞翁失马 ) ( 别有风趣 ) (月明人静 )yìnɡ hèɡāo lóu lín lì chē shuǐ mǎ lónɡ dēnɡ huǒ huī huánɡ( 应和 ) ( 高楼林立 ) ( 车水马龙 ) ( 灯火辉煌 )yī shān bànɡ shuǐ jī quǎn xiānɡ wén( 依山傍水) ( 鸡犬相闻 )第二单元měi cān sōnɡ zhī fú shì huī chén huá dònɡ shǎnɡ wǔ shèn chū（美餐）（松脂）（拂拭）（灰尘）（划动）（晌午）（渗出）yān mò zhēnɡ zhá yì fān mái zài chōnɡ shuā duàn jué tuī cè（淹没）（挣扎）（一番）（埋在）（冲刷）（断绝）（推测）xiánɡ xì qínɡ xínɡ kǒng lóng bèn zhòng chí dùn tán qǐɡē zi （详细）（情形）（恐龙）（笨重）（迟钝）（谈起）（鸽子）ɡēn jù mò qī suì dào qián zhī péng zhàng tóu lú niǎo yì（根据）（末期）（隧道）（前肢）（膨胀）（头颅）（鸟翼）kāi pì pī kāi tuō lí miáo huì shí dūn jù bèi nà mǐ（开辟）（劈开）（脱离）（描绘）（十吨）（具备）（纳米）yōng yǒu bīng xiāng dī tàn cái liào gāng tiě yǐn xíng jiàn kāng （拥有）（冰箱）（低碳）（材料）（钢铁）（隐形）（健康）xì bāo jí bìng yù fáng bìng zào xū yào shēn kè chú chòu ɡōnɡ nénɡ（细胞）（疾病）（预防）（病灶）（需要）（深刻）（除臭）（功能）shū cài sǐ wánɡ lǜ fān téng nù hǒu qián fǔ hòu yǎnɡ（蔬菜）（死亡率）（翻腾怒吼）（前俯后仰）chénɡ qiān shànɡ wàn rè là là wú cǎi bān lán háo bù xiānɡɡān （成千上万）（热辣辣）（五彩斑斓）（毫不相干）línɡ kōnɡáo xiánɡ xīn xǐ ruò kuáng cū zhuàng yǒu lì xíng tài gè yì（凌空翱翔）（欣喜若狂）（粗壮有力）（形态各异）diǎn jīnɡ zhī bǐ rú máo yǐn xuè nǎo lú pénɡ dà tiān zhī jiāo zǐ( 点睛之笔 ) ( 茹毛饮血 ) ( 脑颅膨大 ) ( 天之骄子 )wú néng wéi lì yán huánɡ zǐ sūn chánɡé bēn yuè bó bó shēnɡ jī( 无能为力 ) ( 炎黄子孙 ) ( 嫦娥奔月 ) ( 勃勃生机 ) zhèn ěr yù lónɡ（震耳欲聋）第三单元fán xīng téng luó bō tāo xī gài duǒ cáng chánɡ yánɡ zhāo xiá( 繁星) ( 藤萝 ) ( 波涛 ) ( 膝盖 ) ( 躲藏 ) （徜徉）（朝霞）mò lǜ nèn lǜ jí zhōng jiāo chā jiào liàn yōnɡ jǐ zhǐ huī( 墨绿) ( 嫩绿) ( 集中 ) ( 交叉 ) ( 教练 ) （拥挤）（指挥）zhěng qí jié pāi mò shuǐ píng bái huà mài suì xiāo sǎ méng lóng （整齐）（节拍）（墨水瓶）（白桦）（麦穗）（潇洒）（朦胧）jì jìng máo róng róng xiù huā tú mǒ cāng cuì yù dī（寂静）（毛茸茸）（绣花）（涂抹）（苍翠欲滴）yǒng bù màn miè lǜ de chū qí shān shān lái chí bái xuěái ái ( 永不漫灭 ) ( 绿得出奇 ) ( 姗姗来迟 ) （白雪皑皑）jié bái de liú sū càn càn de jīn huī( 洁白的流苏 ) ( 灿灿的金晖 )jīng liàng de xuě huā yín sè de guāng huá( 晶亮的雪花 ) （银色的光华）。
部编语文七年级上册第1—3单元“读读写写”根据拼音写出相应的词语含答案
最新部编版语文七年级上册第1—3单元“读读写写”（根据拼音写出相应的词语）第一单元第1课春1.山lǎnɡ rùn（）起来了，水涨起来了，太阳的脸红起来了。
2.风里带来些新翻的泥土的气息，混着青草味儿，还有各种花的香，都在微微润湿的空气里yùn niànɡ（）。
3.鸟儿将巢安在繁花嫩叶当中，高兴起来了，hū pénɡ yǐn bàn（）地mài nònɡ（）清脆的hóu lónɡ（），唱出宛转的曲子，跟轻风流水yìnɡ hè（）着。
4.牛背上牧童的短笛，这时候也成天liáo liànɡ（）地响着。
5.傍晚时候，上灯了，一点点黄晕的光，hōnɡ tuō（）出一片安静而和平的夜。
6.他们的房屋，稀稀疏疏的，在雨里jìnɡ mò（）着。
7.天上fēnɡ zhēnɡ（）渐渐多了，地上孩子也多了。
8.舒活舒活筋骨，dǒu sǒu dǒu sǒu（）精神，各做各的一份儿事去。
9.春天像小姑娘，huā zhī zhāo zhǎn（）的，笑着，走着。
10.春天像jiàn zhuànɡ（）的青年，有铁一般的胳膊和腰脚，领着我们上前去。
第2课济南的冬天1.山尖全白了，给蓝天xiānɡ（）上一道银边。
2.设若dān dān（）只有阳光，那也算不了出奇。
3.一个老城，有山有水，全在天底下晒着阳光，暖和ān shì（）地睡着。
4.他们一看那些小山，心中便觉得有了zhuó luò（），有了依靠。
5.因为有这样cí shàn（）的冬天，干啥还希望别的呢！6.这件花衣好像被风儿吹动，叫你希望看见一点更美的山的jī fū（）。
7.济南是受不住大雪的，那些小山太xiù qì（）！8.古老的济南，城里那么狭窄，城外又那么kuān chǎnɡ（）。
写作教程第一册1~3单元答案
写作教程第一册部分答案(Units1~3)Unit 1Part IV Writing Notes (1)Suggested answers to the questions1.Notes are the simplest and shortest form of written communicationand they are quick, easy and convenient.2.A note has three essential components:①the addressee--the person(s)to whom the note is written; ②the message; ③the sender3.Notes are characterized by their brevity, informality in style, anddedication to a single topic.Part V Follow-up Exercises1.1)mouse-hearted→chicken-heart 2)politician→statesman 3)wind→breeze 4)utilize→drink 5)ascertaining→finding 6)was bombarded with→received a lot of 7）opened→drew back 8）contain→accommodate 9）habits→customs3.1) experienced 2)elapsed 3)attempting 4)with 5)take up 6)made 7)endeavor 8)true4. 1) The state attorney said that the man would be prosecuted.2) We suppose that a referee should be disinterested but not uninterested.3) Tony can hit a ball farther than I can.4) We must pursue this matter further.5) The principles behind our constitution are a principal reason for its astounding success.6) All the band instruments except the tuba will be carried to the auditorium for the music contest.7) The federal government comprises the legislative, judicial, and executive branches.8) The whole region was struck by an economic disaster.9) (correct)10) He was awaked to the risk.Unit 2Colloquial and slangSuggested answers to the questionsThe grotesqueness of this sentence lies in the incongruity of style. The word bomb is a slang expression that is too casual to go with the subject, and the sentence can be revised into: The violin virtuoso’s performance on the cello was a big failure.The revised short paragraph: The author has made a lifetime’s study of film history, and the knowledge she has accumulated is tempered by a fine sense of judgment. She devotes a whole chapter to an analysis of horror films. These films, according to her, do much more than just frighten us; they enable us to forget our worries.Style and audienceSuggested answers to the questionsThe expected reader of Excerpt 1 is a pal of the person who leaves the note, so the language is colloquial.The reader of Excerpt 2 does not have an intimate relationship with the writer of the note. They might be business associates, for example. The language stands somewhere between formal and informal but more on the formal side.Reference for the Classroom Activities1.If there is an accident or incident that may be covered by this policy,notify us in writing as soon as possible. Y ou can give tis notice to any of our authorized agents.2.(omitted)3.The first excerpt is colloquial and the two persons may be friends orcolleagues.The second excerpt is rather formal and the two persons may be colleagues.The third is the most formal. Actually it is taken from a report and the writer may be the head of the department.Point of viewRevised version 1When people read about a natural disaster in another country, it hardly affects them. Of course, they feel bad and upset when people get killed. But as these disasters happen thousands of miles away from them and because they don’t affect their own life, they are not traumatized by them. If a flood killed their own close friends, they would be more emotionally upset.Revised version 2When we read about a natural disaster in another country, it hardly affects us. Of course, we feel bad and upset when people get killed. But as these disasters happen thousands of miles away from us and because they don’t affect our own life, we are not traumatized by them. If a flood killed our close friends, we would be more emotionally upset.Notice while the first version is comfortable and respectable, the second one involves the audience more effectively and directly because of the use of the pronoun we. The pronoun you can also achieve the same effect in this paragraph.Part IV WritingSample 1 Suggested answer to the exerciseSept.8Dear Aunt Jenny,Thank you so much for the lovely robot dog you give me. It is just what I’ve dreamed of for ages. Y ou really know me. Thanks again for the wonderful gift.Y ours,RoseSample 2 Suggested answer to the exerciseSept. 12Lucy,I got a ticket for you to the Arts Festival on Sept. 18 at Yifu Auditorium, as we have discussed before. I’ll arrange for a car to bring you here at 4:00 p.m. Give me a ring and tell me if you are coming or not. Thanks.JennyPart V Follow-up Exercises1.1）In this excerpt, Liza’s style is all but appropriate for the occasion.At the beginning, she chooses a formal and affected style but later slides to colloquial and finally slang expressions. The other characters at the scene use general and colloquial vocabulary that is appropriate for the context.2) No. Here the obvious switch from a formal to a highly colloquialstyle shows Liza in a transitional stage. She does not see that her learned comment on the weather is inappropriate. And when the subject changes into influenza, she forgets she is supposed to be a lady and reverts to(回归) her natural speech, which incidentally is much more expressive and colorful than her phony formality（假装正式）.2. 1) play a minor role/be a uility man 2)That’s Greek to me. 3)belated action/advice 4)Where there is smoke there’s fire. 5)an evil creature 6)walk into the trap 7)on e’s face glowing with health3. 1) We must practice economy./ We must reduce unnecessary expenditure.2) It is essential to control environmental pollution.3) We must arrive at the station on time.4) Financial expenditures should be arranged in order of priority.5) We must speed up constructions of urban housing so as to improve the housing condition.6) To be allowed to make profits, private capital has to meet twoconditions: the profits must be legal, and they must not be excessive.7) During the period of the Tenth Five-Y ear Plan we must never neglect grain production. Instead, we must steadily increase it.4. Reference version: Women’s RightsIn feudal China, women had low social status, and were regarded as inferior to men. Thanks to the women’s liberation movement, women have achieved equal status with men, which is established by the law. But in fact, they still can’t enjoy equal rights with men.At home, wives are expected to do all the housework, which is obviously unfair. Husban and wife should share the housework and family responsibilities. But in some families husbands usually get angry when they find the cleaning or cooking unfinished by their wives. One can’t help wondering why they don’t do it by themselves.I think women should be spiritually and financially independent if they want real equality. In order to do that, they have to learn as much as men so as to find a good job. Appearance is no longer important to women. It is their ability that can bring them a good job rather thantheir appearance. So I think the best way for women to win more rights is to receive good education.5.1)me2) who 3)I 4)me/myself 5)me 6)each other’s 7)who 8)us9)whom 10)some 11)one’s 12)his 13)his 14)his, his6. 1) We are all born into this world as equals, but for various reasons, not all of us are treated as equals. This inequality begins when we reach the age of ive, for this is when we will enter elementary school. In school, we are no longer “Mommy’s little darling.”We now have to prove ourselves to the other children and also to our teacher. If we seem different from the other students, we are treated differently, and these differences could be anything: pants, shoes, speech, religion, and so forth. Right from the start, we think that as long as we are different, there is something wrong with us.Unit 3Part IIConciseness Classroom activities2. 1) Xianming High School has a faculty that do their jobs well.2) One of the requirements is a term paper of three thousand words on asubject of your choice.3) College is difficult to adjust to because you are left on your own tosolve many problems.4) A career in the Army has both advantages and disadvantages. So doesthe return to the civilian life from the military.5) Teenage pregnancy has created a lot of controversy.Preciseness Classroom activities1. 1) Kate said she had an boring time at the homecoming party.2) I think Mr Brown is an unconvincing speaker.3) The husband gave the wife a diamond necklace for her bithday.4) There are certain traits I look for in judging a person’s character.Effectiveness Classroom activities1.1) Jo’s mouth: decidedher nose: comicalher eyes: sharp, gray, fierce, funny, thoughtfulher hair: long, thickher shoulder: roundher hands and feet: big2) Awkward colt is repetitious as the word colt carries the sense of awkwardness already. Therefore, it is unnecessary to use a modifierher.Louisa May Alcott’s novel Little WomenLouisa May Alcott(1832-1888)路易莎·梅·奥尔科特是一位美国女作家。
人教版七年级英语下册1--3单元知识点总结
人教版七年级英语下册1--3单元知识点总结第一单元Can you play the guitar重点短语1. play chess 下国际象棋2. play the guitar 弹吉他3. speak English 说英语4. English club 英语俱乐部5. talk to 跟…说6. play the violin 拉小提琴7. play the piano 弹钢琴8. play the drums 敲鼓9. make friends 结交朋友10. do kung fu 练(中国) 功夫11. tell stories 讲故事12. play games 做游戏13. on the weekend/on weekends 在周末重点语法1.can+动词原形，它不随主语和数而变化。
(1)含有can的肯定句：主语+can+谓语动词的原形+其他。
如：I can play the piano.(2)变一般疑问句时，把can提前：Can+主语+动词原形+其他？如：Can you paly the piano?肯定回答：Yes，主语+can。
否定回答：No，主语+can‘t. 如：Yes,I can. / No I can’t.(3)含有can的否定句：主语+can't+动词的原形+其他。
如：I can’t play the piano(4)含有can的特殊疑问句：特殊疑问词+can+主语+动词原形+其他？如：What can you do?/ What can he do?2. Talk , tell ,say , speak 的区别(1)Speak“说”或“讲”不强调说话内容.用作不及物动词时，侧重指说话的动作而非内容，可指长篇演讲或三言两语的交谈，也可指简单的开口说话的能力；用作及物动词时，其宾语常为某种语言。
speak to sb. 同某人说话speak Chinese说汉语吗(2)Talk谈论某事, 强调双方“交谈”和speak 一样，强调说话的动作而非内容talk about / to / with和某人谈论某事(3)Say“说出”“说过”侧重内容。
数学三年级上1-3单元总结
数学三年级上1-3单元总结（一）知识要点。
1. 时间单位的认识。
- 钟面上有时针、分针和秒针。
时针最短最粗，分针较长较粗，秒针最长最细。
- 钟面上有12个大格，60个小格。
时针走1大格是1小时；分针走1小格是1分钟，走1大格是5分钟，走一圈是60分钟；秒针走1小格是1秒，走1大格是5秒，走一圈是60秒，也就是1分钟。
2. 时间单位的换算。
- 1时 = 60分，1分 = 60秒。
例如：3时 = 3×60 = 180分；120秒 = 120÷60 = 2分。
3. 计算经过时间。
- 可以用数格的方法，分针从一个数字走到下一个数字是5分钟。
- 也可以用结束时间 - 开始时间。
例如：小明8：30开始写作业，9：10完成，经过的时间是9时10分 - 8时30分 = 40分钟。
（二）常见题型。
1. 单位换算题。
- 如：3分=( )秒，答案是3×60 = 180秒。
2. 比较大小题。
- 例如：5分和300秒比较大小。
因为5分 = 5×60 = 300秒，所以5分 = 300秒。
3. 计算经过时间题。
- 如：一列火车8：15出发，9：00到达目的地，行驶了多长时间？答案是9时00分 - 8时15分 = 45分钟。
（一）知识要点。
1. 两位数加、减两位数口算。
- 口算方法：把两位数拆分成整十数和一位数，先算整十数加、减整十数，再算一位数加、减一位数，最后把两次结果相加。
- 例如：35+24，可以先算30+20 = 50，再算5+4 = 9，最后50+9 = 59；48 - 23，可以先算40 - 20 = 20，再算8 - 3 = 5，最后20+5 = 25。
2. 几百几十加、减几百几十笔算。
- 笔算方法：相同数位对齐，从个位算起，哪一位上的数相加满十，就向前一位进1；哪一位上的数不够减，就从前一位退1当10，和本位上的数相加后再减。
- 例如：340+180，个位0+0 = 0，十位4+8 = 12，满十向百位进1，百位3+1+1 = 5，结果是520；520 - 370，个位0 - 0 = 0，十位2不够减7，从百位退1当10，12 - 7 = 5，百位4 - 3 = 1，结果是150。
2020人教版二年级语文上册1-3单元知识点
人教版二年级上册语文预习资料第一单元知识要点一、小蝌蚪找妈妈（1）好词积累：大大的脑袋黑灰色的身子长长的尾巴碧绿的衣裳雪白的肚皮快活地游来游去（2）数量词积累：一群小蝌蚪四条腿一只乌龟两只大眼睛一对大眼睛（3）读一读，记一记：脑袋口袋袋子袋鼠欢迎迎接迎风迎面水塘池塘鱼塘荷塘（4）田字格里的生字及组词：两（两个两人）就（就是成就）哪（哪里哪儿）宽（宽大宽广）顶（头顶顶尖）肚（肚子肚皮）皮（头皮皮球）孩（孩子女孩）跳（跳远跳高）（5）句子练习：用“已经”造句。
例：小青蛙的尾巴已经不见了。
（1）我的作业已经写完了。
（2）小树苗已经长高了。
二、我是什么（1）反义词：温和——暴躁好——坏（2）多音字：没（mò淹没没过）（méi 没有没用）（3）读一读，记一记：灌溉田地发动机器淹没庄稼冲毁房屋滋润土壤破坏河堤（4）我会变成什么：【水：汽—→云—→雨—→冰雹—→雪】（5）田字格里的生字及组词：变（变成变化）极（太极北极）片（一片刀片）傍（傍晚傍水）海（大海海水）洋（海洋洋河）作（作业工作）给（送给分给）带（皮带带来）三、植物妈妈有办法（1）课文介绍了哪几种植物？说说它们是怎么传播种子的。
你还知道哪些植物传播种子的办法？①蒲公英：靠风传播种子；②苍耳：靠挂住动物的皮毛传播种子；③豌豆：靠太阳传播种子。
◇课外拓展：1、靠水来传播：椰子：靠水来传播，椰子成熟以后，椰果落到海里便随海水漂到远方。
睡莲：睡莲的果实成熟后沉入水底。
果皮腐烂后，包有海绵状外种皮的种子就会浮起来，漂到其它地方。
2、靠小鸟或其他动物传播：樱桃、野葡萄、野山参：靠小鸟或其他动物把种子吃进肚子，由于消化不掉，便随粪便排出来传播到四面八方。
松子：是靠松鼠储存过冬粮食时带走的。
3、靠风传播：红皮柳：是靠柳絮的飞扬把种子传播到远处去的。
4、还有机械传播种子的方法：凤仙花：凤仙花的果实会弹裂，把种子弹向四方，这是机械传播种子的方法。
还有许多的豆类植物都是用机械传播种子的。
七年级上册英语配套练习答案1-3单元2013年秋季版
SectionAI. 2.Nice too 3.English and 4.Yes 5.No, 6. her 7.HisII. 1.I My 2. to too 3.he his 4.Her she 5. you your 6. No notIII. 1. What’s your name 2. Nice to meet you 3. What’s his name 4.Are you 5.Is sheIV. 1.What’s 2. What’s her 3.What’s his 4. Is , Yes is 5.Is , No,isn’t 6. my nameV. 1.Hello/Hi 2.I’m 3.meet 4.her 5.Her 6.is 7.in 8. It’s 9.color 10.hisVI.1-5 BDCAEVII.书面表达略SectionBI. 1.phone number 2.school 3.first last 4.eight 5. ChinaII. 1.is telephone/phone number 2.am My friend in China 3. Her friend 4. first name 5.Three sixe nineIII. 1. What’s first 2.What’s last 3. What’s phone numberIV. 1. first st 3. friend 4. China 5.Tom 6. Smith 7.is 8. number 9. middle 10. schoolV.Alice Brown eleven two two five one zero eight nine Six Seven Ren Apple Middle SchoolVI.A) 1-5 CABCB 6-10. CBACAB) 11.His last name is Brown 12. His teacher’s first name is Tom. 13.Her phone numberis 498-8866. 14.Yes, it is 15. Yes they are.书面表达略Unit2Section AI.1.This these 2.Those that 3.sister 4.parents 5.friends 6.AreII.1.Who 2.Who is 3.Who are 4.These are brothers 5.Those are parents 6.Are your –Yes,are 7.Are jackets –No, they aren’t.III.1. this is 2. That is 3.These are 4.Who 5.Are parents 6.good dayIV.1. are 2. Who’s 3.are 4. are 5.They’reV. 1-5 DCAEBVI.1. photo 2. grandparents 3.Who 4.sister 5.brothers 6. familySection BI. 1.uncle 2.aunt 3.grandma 4.grandpa 5. photos 6. girl 7. son daughterII. 1.cousins 2. are 3. are 4. are 5.girlsIII. 1. Those 2.these are brothers 3. This is 4. are photos of 5.next photoIV. 1. These are friends 2. Are those sisters 3. Who are 4. Who are 5. Who are 6. These are V. 1. he 2.He’s 3. Who 4. She’s 5.these 6.they 7.areVI.1-4 DCBAVII.A) 1.T 2.T 3.F 4.F 5.F B) 6.parents 7. grandparents 8.aunt 9. His 10. cousinVIII.书面表达略Unit3Section AI.1. teacher 2.dictionaries eraser 3.Excuse 4.Thank welcome 5.hisII. 1.Is 2.Are 3.hers 4.his 5.dictionaries 6.pencil boxes 7.an 8.Bob’sIII. 1.Is your Yes is 2. Is his No, is n’t 3. Are her Yes are 4. Are dictionaries No, aren’t 5.mineIV. 1.Is this pencil mine 2.Is that hers 3.erasers his 4.Excuse me books thank you 5. his green pen his 6.Thank help 7.Anna’s schoolbag 8.Are Bob’s pencils they aren’tV. 1-6 AFCBDEVI.书面表达略Section BI.1.watch 2.library 3.Classroom 4.notebook 5.yoursII.1.watches 2.libraries 3.me 4. at 5.keysIII. 1.my watch 2. spell 3.call me at 4.a set of keys 5.school library Ask for 6.ring mother’s 7. me atIV.1.DEBCAV.1-5CABAB 6-10BACCC 11. A black pen is found 12. The pen is black. 13. Mary found the pen 14.Her/Mary’s telephone number is 236-2283 15.Yes, she is.VI书面表达略Unit4I.1.。
2023年人教版四年级数学下册第1-3单元课时练及答案(精选)
第1单元四则运算第1课时加、减法的意义和各部分间的关系1.填空题。
(1)一个加数是45,另一个加数与它相同,它们的和是()。
(2)在一个减法算式中,差是150,减数是64,被减数是()。
(3)减法是()的逆运算。
(4)两个加数的和是579,其中一个加数是278,另一个加数是()。
(5)被减数是354,差是79,减数是()。
2.根据给出的算式填空。
(1)476-168=308308+()=476476-()=168(2)256+128=384384-()=128384-()=2563.小马虎在做一道减法题时,把减数72错写成27,这时得到的差是309。
正确的差是多少?参考答案1.(1)90(2)214(3)加法(4)301(5)2752.(1)168308(2)2561283.解法一：309+27=336336-72=264答:正确的差是264。
解法二：72-27=45309-45=264答:正确的差是264。
第2课时练习一1.在括号里填上适当的数。
()+347=50027+()=100573-()=170()-212=40()+173=300()-600=2002.根据给出的算式填空。
(1)400-165=235235+()=400400-()=165(2)256+244=500500-()=244500-()=2563.计算,并验算。
119-59=173+169=257+160=475-180=4.滨海实验小学举行花式篮球比赛,明明用了240秒完成了比赛,东东用了215秒完成了比赛。
他们一共用了多少秒完成比赛?参考答案1.153734032521278002.(1)165235(2)2562443.60342417295验算略4.240+215=455(秒)第3课时乘、除法的意义和各部分间的关系1.用下面的三张数字卡片写出一道乘法算式和两道除法算式。
36259002.填写下表。
因数8425因数2636积7501803.列竖式计算并验算。
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绪言1、化学是研究物质的组成、结构、性质以及变化规律的基础科学。
2、道尔顿和阿伏伽德罗分别提出了原子论和分子学说，奠定了近代化学的基础。
3、1869年门捷列夫发现了元素周期律并编制出元素周期表。
第1单元走进化学世界1、物质的变化与性质判断化学变化和物理变化的主要依据是有新物质生成的变化是化学变化，否则是物理变化。
物理性质是物质不经过化学变化就能表现出来的性质，如密度、熔点、沸点、状态、颜色、气味、溶解性、导电性、导热性、延展性等；化学性质是物质通过化学变化才能表现出来的性质，如助燃性、可燃性、氧化性、还原性、毒性、腐蚀性等。
化学是一门以实验为基础的科学蜡烛燃烧实验（1）检验产物 H2O：用干冷烧杯罩火焰上方，烧杯内有水雾CO2：取下烧杯，倒入澄清石灰水，振荡，变浑浊（2）熄灭后：有白烟为石蜡蒸气凝华形成的石蜡小颗粒。
走进化学实验室一、常用仪器及使用方法（一）用于加热的仪器－－试管、烧杯、燃烧匙、蒸发皿、锥形瓶可以直接加热的仪器是－－试管、蒸发皿、燃烧匙只能间接加热的仪器是－－烧杯、烧瓶、锥形瓶（垫石棉网—受热均匀）不可加热的仪器——量筒、漏斗、集气瓶（二）测容器－－量筒量取液体体积时，量筒必须放平稳。
视线与刻度线及量筒内液体凹液面的最低点保持水平。
量取9mL的水应该选用10（填10或50）mL的量筒。
量筒不能用来加热，不能用作反应容器。
（三）称量器－－托盘天平（一般能精确到0.1克）注意点：（1）先调整零点（2）称量物和砝码的位置为“左物右码”。
（3）称量物不能直接放在托盘上。
一般药品称量时，在两边托盘中各放一张大小、质量相同的纸，在纸上称量。
潮湿的或具有腐蚀性的药品（如氢氧化钠），放在玻璃器皿（如小烧杯、表面皿）中称量。
（4）砝码用镊子夹取。
添加砝码时，先大后小。
（5）称量结束后，应使游码归零。
砝码放回砝码盒。
（四）加热器皿－－酒精灯（1）酒精灯的使用要注意“三不”：①不可向燃着的酒精灯内添加酒精；②用火柴点燃酒精灯，不可用燃着的酒精灯直接点燃另一盏酒精灯；③熄灭酒精灯应用灯帽盖熄，不可吹熄。
（2）酒精灯内的酒精量不可超过酒精灯容积的2/3,也不应少于1/4。
（3）酒精灯的火焰分为三层，外焰、内焰、焰心。
用酒精灯的外焰加热物体。
（4）如果酒精灯在燃烧时不慎翻倒，酒精在实验台上燃烧时，应及时用沙子盖灭或用湿抹布扑灭火焰，不能用水冲。
（五）夹持器－-试管夹铁夹夹持试管的位置应在试管口近1/3处。
试管夹夹持试管时，应将试管夹从试管底部往上套；夹持部位在距试管口近1/3处；用手拿住二、化学实验基本操作（一）药品的取用1、药品的存放：一般固体药品放在广口瓶中，液体药品放在细口瓶中。
2、药品取用的总原则①取用量：按实验所需取用药品。
如没有说明用量，应取最少量，固体以盖满试管底部为宜，液体以1-2mL为宜。
多取的试剂不可放回原瓶，也不可乱丢，更不能带出实验室，应放在指定的容器内。
②“三不”：任何药品不能用手拿、舌尝、或直接用鼻闻试剂（如需嗅闻气体的气味，应用手在瓶口轻轻扇动，仅使极少量的气体进入鼻孔）3、固体药品的取用①粉末状及小粒状药品：用药匙或纸槽②块状及条状药品：用镊子夹取4、液体药品的取用①液体试剂的倾注法：取下瓶塞，倒放在桌上，（以免药品被污染,腐蚀实验台）。
标签应向着手心，（以免残留液流下而腐蚀标签）。
拿起试剂瓶，将瓶口紧靠试管口边缘，缓缓地注入试剂，倾注完毕，盖上瓶盖，标签向外，放回原处。
②液体试剂的滴加法：滴管的使用：a、先赶出滴管中的空气，后吸取试剂b、滴入试剂时，滴管要保持垂直悬于容器口上方滴加c、使用过程中，始终保持橡胶乳头在上，以免被试剂腐蚀d、滴管用毕，立即用水洗涤干净（滴瓶上的滴管除外）e、胶头滴管使用时千万不能伸入容器中或与器壁接触，会造成试剂污染（二）连接仪器装置及装置气密性检查装置气密性检查：先将导管的一端浸入水中，用手紧贴容器外壁，稍停片刻，若导管口有气泡冒出，松开手掌，导管口部有水柱上升，就说明装置不漏气。
（三）物质的加热（1）加热固体时，试管口应略下倾斜，试管受热时先预热，再集中加热。
（2）加热液体时，液体体积不超过试管容积的1/3，加热时使试管与桌面约成450角，受热时，先使试管均匀受热，然后给试管里的液体的中下部加热，并且不时地上下移动试管，为了避免伤人，加热时切不可将试管口对着自己或他人。
（六）仪器的洗涤：（1）废渣、废液倒入废物缸中，有用的物质倒入指定的容器中（2）玻璃仪器洗涤干净的标准：玻璃仪器上附着的水，既不聚成水滴，也不成股流下（3）仪器洗干净后，不能乱放，试管洗涤干净后，要倒．插在试管架上晾干。
第二单元我们周围的空气空气1、第一个对空气组成进行探究的化学家是拉瓦锡。
2、空气的成分和组成（1）空气中氧气含量的测定a、可燃物要求：足量且产物是固体：选择红磷b、装置要求：气密性良好c、现象：有大量白烟产生，广口瓶内液面上升约1/5体积d、结论：空气是混合物； O2约占空气体积的1/5，可支持燃烧；N2约占4/5，不支持燃烧，也不能燃烧，难溶于水e、探究：①液面上升小于1/5原因：装置漏气，红磷量不足，未冷却至室温等；②能否用铁代替红磷？不能原因：铁不能在空气中燃烧；③能否用木炭、硫代替红磷？不能原因：产物是气体。
（2）空气的污染及防治：对空气造成污染的主要是有害气体（CO、SO2、NO2）和烟尘等。
目前计入空气污染指数的项目为CO、SO2、NO2、O3和可吸入颗粒物等。
注意：二氧化碳不是污染空气的气体。
（3）空气污染的危害、保护危害：严重损害人体健康,影响作物生长,破坏生态平衡.全球气候变暖,臭氧层破坏和酸雨等保护：加强大气质量监测，改善环境状况，使用清洁能源，工厂的废气经处理过后才能排放，积极植树、造林、种草等。
4、常见气体的用途：①氧气：供呼吸（如潜水、医疗急救）支持燃烧（如燃料燃烧、炼钢、气焊）②氮气：惰性保护气（原因：化性不活泼）、重要原料（硝酸、化肥）、液氮冷冻③稀有气体（He、Ne等的总称）：保护气、电光源、激光技术。
氧气1、氧气的物理性质：不易溶于水，密度比空气大。
2.氧气与下列物质反应现象铁燃烧要在集气瓶底部放少量水或细砂的目的：防止溅落的高温熔化物炸裂瓶底 注意：铁在空气中不可燃烧。
写出硫、铁、红磷分别与氧气反应的化学方程式（参考每一单元的化学方程式）。
（1）硫+氧气（2）铁+ 氧气（3）红磷+氧气3、化合反应：特点多变一。
4、氧化反应：物质与氧发生的化学反应。
剧烈氧化：燃烧缓慢氧化：铁生锈、人的呼吸、食物腐烂、酒的酿造等。
共同点：①都是氧化反应 ②都放热制取氧气1、 实验室制氧气原理 （化学方程式参考每一单元）（142 4 22（2）过氧化氢 水 + 氧气 H 2O 2 H 2O O 2（3）氯酸钾 氯化钾 + 氧气KClO 3 KCl O 22、气体制取与收集装置的选择发生装置：固固加热型（如加热高锰酸钾，氯酸钾和二氧化锰的混合物） 固液常温型 （过氧化氢溶液和二氧化锰）收集装置：密度比空气大的气体（如氧气），用向上排空气法；。
密度比空气小气体（如氢气），用向下排空气法；难溶于水且不与水反应的气体（如氧气），用排水法。
3、制取氧气的操作步骤和注意点（以高锰酸钾制取氧气并用排水法收集为例）二氧化锰—→二氧化锰 加热a 、步骤：查—装—定—点—收—移—熄b 、注意点①试管口略向下倾斜：防止冷凝水倒流引起试管破裂 ②药品平铺在试管的底部：均匀受热 ③铁夹夹在离管口约1/3处④导管应稍露出橡皮塞：便于气体排出⑤试管口应放一团棉花：防止高锰酸钾粉末进入导管⑥排水法收集时，待气泡均匀连续冒出时再收集（刚开始排出的是空气） ⑦实验结束时，先移导管再熄灭酒精灯：防止水倒吸引起试管破裂 ⑧用排空气法收集气体时，导管伸到集气瓶底部4、氧气的验满：用带火星的木条放在集气瓶口，若木条复燃则满； 检验：用带火星的木条伸入集气瓶内，若木条复燃则是氧气。
5、催化剂（触媒）：在化学反应中能改变其他物质的化学反应速率，而本身的质量和化学性质在反应前后都没有发生变化的物质。
（一变两不变）6、分解反应：一变多7、工业制氧气——分离液态空气法（原理:氮气和氧气的沸点不同 物理变化）第三单元 物质构成的奥秘 分子与原子1、分子和原子化学反应的实质：在化学反应中分子分裂为原子，原子重新组合成新的分子。
原子的结构1、原子结构示意图的认识 （1）在原子中核电荷数=质子数=核外电子数（2）原子的质量主要集中在原子核 上决定元素种类 质子数（核电荷数）（3）三决定说明：最外层电子数相同（即同族）其化学性质相似（He 最外层2个电子为稳定结构，与Ne 相似）。
（4）背写1-20号元素，会画出原子结构示意图。
（5）稀有气体的原子最外层都有8个电子（氦为2个电子），是相对稳定结构；金属元素的原子最外层电子数小于4，在化学反应中易失去电子；非金属元素的原子的最外层电子数大于4，在化学反应中易得到电子。
2、离子：带电的原子或原子团（1）表示方法及意义：如Al 3+：一个铝离子带3个单位正电荷 （2）离子结构示意图的认识注意：与原子示意图的区别： 质子数=电子数则为原子结构示意图*原子数≠电子数为离子结构示意图3、物质的构成分子： 元素符号右下角带下标数字的单质：如H 2、O 2、N 2、Cl 2；以及非金属化合物，如水（H 2O ）、二氧化碳（CO 2）等。
原子：金属单质：如汞（Hg ）、铁(Fe)等；非金属固体单质：如红磷(P)、硫(S)、金刚石(C)等；稀有气体单质：如氦气(He)、氖气(Ne)等。
离子：金属化合物：如氯化钠（NaCl ）由钠离子（Na +）氯离子（Cl -）构成等。
4、（1）相对原子质量=（2）相对原子质量≈质子数+中子数元素 1、元素（1）定义：具有相同核电荷数（质子数）的一类原子的总称决定元素化学性质 最外层电子数 决定原子的质量 原子核一个原子的质量一个碳12原子质量的十二分之一注意：（1）一种元素与另一种元素的本质区别：质子数不同；（2）元素与原子的区别：元素只讲种类不讲个数；原子既可以讲种类又可以讲数量。
（2）表示方法——元素符号：一大二小 a 、书写方法：b 、意义注意：*有些元素符号还可表示一种单质 如Fe 、He 、C 、Si*在元素符号前加上数字后只能有微观意义，没有宏观意义，如3O ：只表示3个氧原子 c 、有关元素周期表*发 现：门捷列夫*排列依据*注：原子序数=质子数d 、元素之最：地壳：O 、Si 、Al 、Fe 空气：N。