初三英语语法知识汇总【热门20篇】

I were a bird, but the fathers love is the sky, I fly in the fathers care. I am a little fish, and fathers love is the sea, I swam in the warmth of a father.

My father is an ordinary teacher, but in my eyes is the worlds greatest dad.

I remember one year winter, I went to school wearing a quilted jacket, the less I shivering cold, I rub regret didnt listen to mothers words to heart. Then listen to wu slightly said: "Ma Fengqi, your father is coming!" I walked out of the classroom, I saw dad with a smile, holding a cotton-padded jacket, said "here, put on". I put on my winter jacket, warm, the in the mind is warm, father said "later should pay attention to". I tried nodded with a smile. Back home, mother heard that I went to school wearing a quilted jacket, less mercilessly scold me a meal, was going to beat me, dad came over with a smile, say "children dont understand, forget it." I am grateful to look at dad, dad I with tolerance education.

At another time, I ran a curse outside also lied to my mother, mother criticism let me blush with shame, I shed tears of regret. Dad saw hurriedly give me wipe tears, give me a reason, and the mother said: "beat and scold the child is not the best education method, to give them reasonable. After all, was a child." Father has told me a lot of truth, let me be a mistake.

I grew up day by day, know to be grateful parents. When I tired parents pass a hot cup of tea; Finished eating dinner, mom and dad rest, I to wash the dishes.

I have a good father, he let me know what love is. I grew up in love, in the heart lit a lamp that gratitude lamp, light up my life!

我是一只小鸟，而爸爸的爱是天空，我飞翔在父爱的关怀中。我是一条小鱼，而爸爸的爱是海洋，我游弋在父爱的温馨中。

我的爸爸是一名普通的教师，但在我眼里却是世界上最伟大的爸爸。

记得有一年严冬，我上学少穿了一件棉袄，冻得我直哆嗦，我搓着手心里后悔没听妈妈的话。这时听吴微微说：“马凤岐，你爸爸来了!”我走出教室，只见爸爸微笑着，手里拿着一件棉袄，说“来，穿上吧”。我穿上棉袄，身上暖和了，心里更是暖洋洋的，爸爸说“以后要注意啊”。我笑着使劲地点了点头。回到家里，妈妈听说我上学少穿了一件棉袄，狠狠的训斥了我一顿，正要打我，爸爸笑着走过来，说“小孩子不懂事，算了吧。”我感激的看着爸爸，爸爸用宽容教育了我。

还有一次，我在外面闯了祸还对妈妈撒慌，妈妈的批评让我脸红，我流下了悔恨的泪水。爸爸见了急忙给我擦干眼泪，给我讲道理，并对妈妈说：“打骂孩子不是最好的教育方法，要给他们讲道理。毕竟还是小孩子嘛。”爸爸有给我讲了好多道理，让我心悦诚服的认了错。

我一天天长大，知道了要感恩父母。我会父母劳累的时候递上一杯热茶;吃完了饭，爸爸妈妈休息，我来洗碗。

我有一个好爸爸，他让我知道了什么是爱。我在爱中成长，心中亮着一盏感恩的灯，照亮我的人生路!

All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer.

Sports change with the seasons. People play different games in winter and summer. Swimming is fun in warm weather, but skating is good in winter.

Some sports are so interesting that people everywhere go in for them. Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers. Some sports or games go back thousands of years, like running or jumping. Chinese wushu, for example, has a very long history. But basketball and volleyball are rather new. People are inventing new sports or games all the time. Water skiing is one of the newest in the family of sports.

People from different countries may not be able to understand each other, but after a game together they often become good friends. Sports help to train a persons character. One learns to fight hard but fight fair, to win without pride and to lose with grace.

Spring comes at last. Everything begins to grow. The trees turn green, and the flowers come out. On the playground, in the fields, on each side of the road, the young grass grows everywhere.

Spring also arrives in our school. Come and see, behind our teaching building, there are some small pear trees covered with white flowers; on both sides of it, there are some other flowers smiling at you, Some are yellow, some are red. In our school garden, more flowers are there. All kinds of flowers of many colours can be seen.

Look, there are some Kites flying in the sky. The spring wind is blowing. The sun is shining brightly. Some boys are playing games in the sun, Listen, a group of girls are singing Where’s spring? It sounds like the singing of lark birds. All these make me think that spring is here, spring is there, and spring is just in our school. Fhe boys and the girls are all like flowers in spring.

Nowdays,TV and computer is becoming more and more popular in our ldaily life,since which is a important tool to our entertainment and a way which we can scan and understand the thing that happened outside.

But every coin has two sides .computer and TV can make us learn new knowledge which we cant leran from class ,it can help us find out the diference between our life and out world,so that us make a progress.However,on the contary TV and computer also take us some disadvantage to our life ,especially to young student ,like us.TV and computer easily male us addicted to its fun ,we easily like its game so fogert to finish our homework ,even want to play game so cut classes .

So to younger generation,as far as i am concerned,i think that we should handle the problem ofTV and computer in a prpper way ,not pnly see the advantage but also see the disadvantage of it ,apply it reasonable to that it can help to our study.

[初三英语作文电视电脑的优缺点

First we should check the wound to say how serious it is.

If it is only a small wound and bleeding a little blood,we should use some clean

gauze or cotton to press on his wound,give a little strength to stop it.

If it is bleeding harder and dark red blood bleeding in flow,wind the bandage in the distal end of the wound and then take him to the hospital.

If the wuond is bleeding seriously and the blood is fresh red,wind the bandage in the proximal endof the wound and then take him to the hospital.

I m a primary school student. I go to school every day from Monday to Friday. Every morning I have some milk and toast for a quick breakfast. I like toast with strawberry jam.

我是一名小学生。我每天星期一到星期五都要去学校。每天早晨我都是快速地喝牛奶、吃面包来作为早餐。我喜欢在面包上蘸草莓酱。

I don t have lunch at the school canteen. I like to have a sandwich, an apple or a bar of chocolate for lunch.

我不在学校饭堂吃午餐。我午餐喜欢吃一片三明治，一个苹果或者一块巧克力。

Dinner is usually nice with my family together. My mother likes to cook some beef or chicken, vegetables, and some fruit salad. After dinner, I have some ice cream. It s delicious.

晚餐通常都是很好的，而且都是和我的家人一起吃。我的妈妈喜欢煮牛肉或者鸡肉，蔬菜，还有一些水果沙拉。晚餐后，我会吃冰淇淋。冰淇淋很好吃的。

[精选初三英语作文:我的三餐

Advantages of owning a private car. 2)Disadvantages of owning a private car. 3)Should it be necessary to enlarge the private car market? Why or why not? Nowadays, any Chinese can enjoy the luxury of owning a private car - if he or she can afford it. Having a car of your own means no more traveling to work on crowded buses or subway trains, and you can drop off the children at school on the way. Moreover, it also means that you can enjoy the weekends and holidays better, because with a car you can go to places where theregular buses and trains do not go, and so you can find a quiet scenic spot with no crowds. However, there are drawbacks to owning a car. For one thing, with the increase in car ownership in recent years, the roads are becoming more and more crowded, often making the journey to work more of a nightmare than a dream. For another, it is not cheap to run a car, as the prices of gasoline and repairs are constantly rising, not to mention the prices you have to pay for a licence and insurance coverage. Having considered both sides of the argument, I have come to the conclusion that the advantages of owning a car outweigh the disadvantages. Therefore, it seems to me that China should increase its output of automobiles and enlarge the private car market. The result would be that cars would become cheaper, while at the same time the extra demand would encourage the auto industry to produce more efficient and family-oriented vehicles.

[关于初三英语的作文:Private car

The earth moves round the sun,and the moon moves round the earth.When our part of the earth turns to the sun,it is day. When our part of the earth turns away from the sun,it is night.

The sun is bigger than the moon.But sometimes the moon looks bigger than the sun,because it is much nearer to the earth.

The sun is very bright.It gives very strong light.The moon looks quite bright,too,but it doesnt give any light at all.The light from the moon comes from the sun.

The moon looks much bigger and brighter than the other stars.But in fact many stars are much bigger and brighter than the moon.They look smaller than the moon because they are farther away from the earth.

[初三英语作文之The space

For the young people, it is very important to have ambition, they need the motivation to move on. But most of them are just talking about the ambition and never take the action. The action is as important as the ambition. On the one hand, ambition sets up the goal for a person to fight. Without ambition, no one can be successful, ambition is just like the light in the dark, it leads people to see the bright future.

On the other hand, action helps people to realize their dreams. Sometimes, action even is more important than the ambition. Everyone has the ambition, but the action makes them different. The one who just keeps thinking and not to take action will never be successful. As the saying that no pain, no gain, it reminds people to take action. So we need to have both ambition and action.

对于年轻人来说，有雄心壮志是很重要的，他们需要动力来前进。但是他们大部分人只是嘴上说说，从来不行动。行动和决心一样重要。一方面，决心为人定下目标去奋斗。没有决心，没有人能够成功，决心就如黑暗中的灯光，引导着人们来看光明的未来。

另一方面，行动帮助人们实现他们的梦想。有时候，行动比决心更加重要。每个人都有决心，但是行动才会有所作为。谁只是想想而不采取行动的话，是不会成功的。正如有句话说没有付出，就没有收获，这告诉人们要采取行动。因此我们既需要决心，也需要行动。

一、以形式主语it引导的句型。

句型1. It happened(chanced) that +clause. = sb. happened /chanced sth. = sb. did sth. by chance. 如：

It happened that he was out when I got there. 当我到那儿时，碰巧他不在。

句型2、It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ be doing/ have done/ had done 如：(还有动词appear可这样使用)

It seemed that he had been to Beijing before.好象你以去过北京。

二、定语从句：

句型1、由as引导的非限定性的定语从句。如：

As we have known, he is a most good student.众所周知，他是个很好的学生。

句型2、由which引导的非限定性的定语从句。如：

He is a professor, which I have been looking forward to becoming.

他是个教授，那是我一直盼望的职业。(因为先行词professor是表示职业的名词，因此引导词用which，而不用who。(注意：关于which和as之间的比较请看语法的定语从句部分。)

三、让步状语从句

句型1、No matter what / which / who / where / when /

whose+从句，+主句。注意从句中的时态一般情况用一般现在时态。如：

No matter what you do, you must do it well.

四、条件状语从句

句型1、When / So long as / As long as / Once +从句，+主句。(从句也可以放在主句之后。)如：

As long as you give me some money, I will let you go.只要你给我一些钱，我就让你走。

句型2、主句+on condition that+从句。如：

I will go with you on condition that you give me some money.我和你一起去的条件是你给我一些钱。

句型3、主句+unless+从句.(注意：由于unless本身是否定词，所引导的从句的谓语动词用肯定。)如：

I will go there tomorrow unless it rains.我明天去那儿除非下雨。

五、原因状语从句

句型1、主句+in case+从句。(in case表示以免)如：

I will take my raincoat in case it rains.我要把雨衣带上以免下雨。

句型2、主句+due to / because of / owning to / + the fact that +从句。如：

He did not come to school because of the fact that he was

ill.由于他有病了，所以没有来上学。

六、时间状语从句

句型1、When / While / As +从句，+主句。(关于它们之间的区别请看语法。)如：

When I was in the country, I used to carry some water for you.当我在农村时，我常常给你打水。

句型2、主句+after / before +从句. 如：

They hadn’t been married four months before they were

devoiced.他们绘结婚不到四个月就离婚了。

We went home after we had finished the work.我们做完此工作就回家了。

七地点状语从句

句型1、Where +从句，+主句. 如：

Where there is no rain, farming is difficult or impossible.哪里没有雨水，种庄稼是很难的或者是不可能的。

句型2、Anywhere / wherever+从句，+主句. 如：

Anywhere I go, my wife goes too.无论我去哪儿，我的妻子也去哪儿。

八、目的状语从句

句型1、主句+in order that / so that +从句.如：www.yingyuzuowen.cn

I got up early in order that I could catch the first bus.我起得很早，以便能赶上早班车。

九、结果状语从句

句型1、主句+so that+从句. 如：

It was very cold, so that the river froze.天气很冷，因此河水结冰了。

句型2、So+形容词/ 副词+特定动词+主语+…+that+从句.

So interesting is this book that I would like to read it again.这本书那么有趣，我想再读一遍。

十、比较状语从句

句型1、The +形容词比较级……，(主句)the +形容词比较级+……如：

The sooner you do it, the better it will be.越早越好。

句型2、主语+谓语+as +形容词原级+as +被比较的对象. 如：

He is as busy as a bee.他非常忙。

希望以上的初中英语句型可以帮你在写作上解决一个大忙。

How to be Stronger

with the improvement of peoples material conditions, people have higher demands for living quality. everyone wants to have a strong body and good living habits. how can we do that?

first, get up early and keep doing exercises in the morning every day. its a good beginning of the day.

second, pay attention to daily diet and have balancedfood.it can ensure your health.

besides these, the most important thing is to be calm and good-natured. hope you will be happy forever.

with the improvement of peoples material conditions, people have higher demands for living quality. people wish to be in good health and to have good living habits. how shall we do?

first, keep going to bed and getting up early every clay. then do some exercises in the open air to breathe the fresh air in the morning, so we will have a pleasant mood in a day.

then have balanced food to ensure our health. eat more vegetables.

being calm and good-natured is most important for our health. hope you will be happy forever.

[How to be Stronger初三英语作文

Christmas is one of the most important celebrations of the year for the western countries. it falls on the twenty- fifth of december and has the same importance as chinese new year to people with english backgrounds. the celebration is for the birth of jesus christ, who is the son of god in christianity. now days christmas is no longer only celebrated by the christians, but by most people from all over the world.

On the twenty- fourth of december everyone gets excited for it’s the day before christmas which is called christmas eve. the children are usually sent to bed early and are warned that “santa claus will only come and give you a present if you be good.” the younger kids actually believe that santa will come down the chimney on the sleigh that’s pulled by his reindeers. food like short bread and beer are prepared for santa when he comes, however most times parents just eat them. some children put socks and sacks up for the holding of the presents (that their parents put in).

Rise and shine on christmas morning! the children are always the first ones to wake up, some even do at four. present wrappers everywhere! they look into their presents with a big smile on their face and oh dear….i hope no one’s disappointed. i feel sorry for anyone that got pink underwear. children play while dinner is prepared by the adults. the christmas dinner are usually eaten together by relatives. the tradition of christmas pudding and roosters are usually eaten with deserts afterwards. the rest of the day is usually games and fun before the good days all come to an end.

I wish everyone a merry christmas and a happy new year!

Environment is a basic human existence conditions, if we destroy the environment, it is ruined our survival conditions.

At present, the ecological environment is becoming more and more bad, is the greatest influence on our water resources. According to the relevant information reported: the laying of drainage system and detergent used to grow, consume the oxygen in the water, fish died, deterioration of ecosystem. Human activities can make a lot of industrial and agricultural pollutants into the water, the water is polluted. The world each year about 4200 sewage into the river, polluting the 5. 5 trillion of fresh water.

This is how the startling fact, protect the environment is everyone duty, why want to destroy?

Lies a small river near my grandmas home, on the bottom, before my sister and brother in ones childhood often swimming in the river, and their friends to play in the water, uncles and aunts are often in the river to wash clothes, wash dishes, and now, near the river built a chemical plant, the production of waste water discharge into the river, originally the bottom stream gradually turned into a black sending out the smell of the river. The adults never go to the river to wash clothes to wash the dishes, friends never go to the river to play, too!

How I miss the crystal-clear stream! I think: cherish resources, good care environment, these are GongZaiDangDai, force and art event! If we are in such polluted water, that we can use water resources will be less and less, we destroy the environment, is destroying our living conditions.

Let us join hands to jointly protect the environment, dont let water into water, protect the environment, is our common responsibility!

环境是一个人类生存最基本的条件，如果我们破坏了环境，这等于破坏了我们生存的条件。

目前，生态环境日益恶劣，对我们影响最大的就是水资源。据有关资料报道：排水系统的铺设和清洁剂的使用有增无减，消耗水中的氧，使鱼类死亡，生态系统恶化。人类的活动会使大量的工业、农业污染物排入水中，使水受到污染。全世界每年约有4200多亿的污水排入河中，污染了5。5万亿的淡水。

这是多么让人触目惊心的事实啊，保护环境是人人有责的，为什么要破坏呢?

我外婆家附近有一条小河，以前清澈见底，我的姐姐、哥哥小时候常常在小河里游泳，和他们的小伙伴们在水中嬉戏，叔叔、阿姨们也常常在这小河中洗衣服、洗菜，而如今，小河旁建造了一个化工厂，把生产的废水排放到河里，原本那清澈见底的小河渐渐变成了黑黑的散发着怪味的小河。大人们再也不去小河洗衣服洗菜了，小伙伴们也再也不去河里嬉戏!

我多么怀念那条清澈见底的小河啊!我想：珍惜资源，爱护环境，这些都是功在当代、力及千秋的大事啊!如果我们在这样污染水，那我们可以用的水资源就会越来越少，我们破坏环境，就是破坏我们生存的条件。

让我们携起手来，共同保护环境，不要让淡水变成污水，保护环境，是我们共同的责任!

敬爱的马老师：

I apologize that I cannot go to school today. Last night my mother had a high fever and coughed badly. I think that she has got flu. She didn t have a good sleep and is very weak today, so I will go to Tiantan Hospital with my mother, and then stay at home to attend her. Because of this I have to ask for leave. I will appreciate you very much if you can allow my leave.

很抱歉我今天不能去上学了。昨天夜里我妈妈发高烧，咳嗽得厉害，我想她可能是得了流感。昨天晚上她休息得不好，而且今天很虚弱，所以我陪妈妈去天坛医院，然后在家照顾她。因此我不得不请假。如果您能准假我会非常感激。

Yours,

Li Li

您的学生 李丽

[初三英语请假条模版

Last week,our class had a parents’Meeting.At the meeting,all the parents talked about whether doing a lot of homework was useful or not.Many parents thought that doing much homework was useful,but a few parents disagree.They thought it takes a lot of time.Most parents thought that it can develop students’ mind.Others thought sudents can’t have a good rest because of it.Some parents thought it can stop students playing computer games.Others disagree,they thought it stops students doing the things they like.

I think too much or little homework are bad for students.Too much homework will make them stressed out,and few homework will make them be lazy,because they’ll have too much time to play,won’t they?

[关于初三英语作文推荐：A Parents’ Meeting

there are 4 members in my warm family, my father, my mother my grendmother and i. My father is a worker, he works hard every day and makes the decision of the family. My mother is a teacher, she has many students which a lot of them have great achievement. My grendmother only stays at home every day , And I am a student reading in XX school, I worked hard on my study, and I have many friends.

In my family, we love each other. We are living in a happy life.

外籍教师Richard想了解一下你所在班级学生的到校方式。假如你是李华，请以The way I go to school为题，写一篇英语短文，想Richard介绍自己的到校方式。

提示：

1. How do you go to school?

2. Why do you prefer to go in that way?

注意：

1. 短文必须包括所有提示内容，并围绕你所选择的某种交通方式，写出二至三个理由，可适当发挥。

2. 文中不得出现真实的人名，校名和地名。

3. 词数60-80个。(短文开头已给出，不计入总词数)

The way I go to school

I’m Li Hua.

参考样文：

I’m Li Hua. I go to school on foot. I have several reasons for that.

First, my home is not very far from my school, it is just about two kilometers away from school. It takes me about 20 minutes to get there. Second, walking to school is a kind of exercise. It is good for my health. Third, it’s pretty safe to walk to school because there is a lot of traffic on the road at this time of a day. So I prefer going to school on foot. It’s really a good choice.

March 6th, 2014

Dear Mr Li,

李老师：

I’m sorry to tell you that I have to ask for sick leave for the whole afternoon class. Because I have a heavy headache now and feel very sick. I think I have to ask for sick leave to go to hospital for medicine. I will attend the next day classes on time.

我很抱歉地告诉你，我想请一整个下午的病假。因为我现在头很疼而且感觉很难受。我觉得我必须得请假去医院看医生。我会准时参加明天的课。

Yours repectful,

Tim

蒂姆

On June 5, 1972, the United Nations was held in Stockholm the United Nations conference on the human environment, the meeting adopted the declaration of the human environment, and puts forward 5 June every year would be a "world environment day". In October the same year, the 27th United Nations general assembly adopted a resolution to accept the proposal. World environment day, is the United Nations to promote global environmental awareness, improve government attention to environmental problems and take action to one of the major media.

The United Nations system and governments, every year on June 5 this day to carry out various activities to promote and stress the importance of protect and improve the human environment.

The United Nations environment programme (unep) announced at the beginning of each year the world environment day theme, and published in the annual world environment day annual report on environmental conditions. During this period of Chinas state environmental protection administration issued the environment bulletin.

From June 5, 1985, China began to commemorate the world environment day activities, with "youth population, environment" as the theme. Since then, every year on June 5, the country hold commemorative activities. 1993 Beijing was elected to the celebration of the city, its theme is "to break the cycle of poverty and environment". Released in April 2014 revision of the environmental protection law of the Peoples Republic of China, article 12: for environment day on 5 June every year.

1972年6月5日联合国在瑞典首都斯德哥尔摩召开了联合国人类环境会议，会议通过了《人类环境宣言》，并提出将每年的6月5日定为“世界环境日”。同年10月，第27届联合国大会通过决议接受了该建议。世界环境日，是联合国促进全球环境意识、提高政府对环境问题的注意并采取行动的主要媒介之一。

联合国系统和各国政府，每年都在6月5日的这一天开展各项活动来宣传与强调保护和改善人类环境的重要性。

联合国环境规划署在每年的年初公布当年的世界环境日主题，并在每年的世界环境日发表环境状况的年度报告书。中国国家环保总局在这期间发布中国环境状况公报。

中国从1985年6月5日开始举办纪念世界环境日的活动，以“青年人口，环境”为主题 。自此之后，每年的6月5日全国各地都要举办纪念活动。1993年北京被选为举办庆祝活动的城市，其主题是“打破贫穷与环境的怪圈”。2014年4月修订公布的《中华人民共和国环境保护法》第十二条：每年6月5日为环境日。

In the life, everybody has a lot of problem. For example, I am a wonderful student. I can usually get a high mark. I study very well. But sometimes I reckless of the examination, so, I cant do it very well. After the exam, I blow it. Most of my teachers usually apprehend me, but my mother sometimes makes little of me. She usually says that, Honey, why you blew the exam, dont forget, you are an excellent student, you must study hard, and you must get the high mark next exam.

When my mother says that, I always feel very chagrin. I am not oracle, why I cant make mistakes. But my father apprehends me. He thinks I am a children, so I can make a little mistake. I always study hard after I blew the exam, because my father cheers on me. I study hard for me, for him, of course, I study hard for my mother too.

When we barge up against, dont trepidation, dont be scared, and tell the tribulation to our kiths, they can help you.

收获，人生之喜悦；

收获，人间之快乐；

收获，世间之甜蜜。

初三，我收获了知识。在短暂的三年初中生活中有快乐，有分享，有喜悦，有悲伤。。。但现在已经要结束初中生活的我还有那么多的不舍与怀念。初三，在这紧张的一年中，我收获更多的是知识。

收获是什么？收获是老师培育的学生，有所作为；收获是农民伯伯春天播种，秋天所得；收获是医生病人生命垂危时，将他从死亡边缘救起……收获就是付出所得的回报。

初三，我的收获很多，不仅是因为紧张的生活而带来的充实，还有在题海中畅游得到的知识。所谓付出就一定有收获。

还记得刚步入初三的我的确有些不知所措，分到实验班的我既高兴又紧张。因为只要自己不努力就会有到差班的风险，所以我不得不努力并把精神时刻紧绷着。在新班级的竞争的确很大，大家都不放过一点时间，下课时再也看不到外面奔跑同学的身影了。

初三就是这样，有人欢喜有人忧，让人紧张也让人充实。摆满课桌的习题与黑板上的中考倒计时都在时时刻刻的提醒着我们要加油要努力，要么奋斗，要么失去。这你洪战辉鼓励自己的一句话，他也认同没有艰苦奋斗的精神是不会有将来的，因此他敢于向命运挑战，不畏命运。有人说初三是残酷的，初三的确充满了挑战，但是只要自己努力，哪怕失败也不会难过。

像蜗牛一样背负着整个家园前行，肩头的重担注定会耽误他的行程，扛着家园却拥有无家的感觉让我心痛，他的励志报告感动无数青少年也许逃避、放弃可以使我跑得飞快，但责任又让我宁愿忍受苦痛扛也是苦放也是痛。初三的我收获的知识最多，因为在初三才能学到更多的知识，虽然有些不得不学，但学到后还是有成就感的

初三:汪思琳

[初三我收获了知识650字作文