介绍西安的英语作文（汇编20篇）

攻克英语写作：滴水穿石，积累成章

考研作文作为考查考生语言表达等综合能力的题型，是考研英语的压轴戏。考生在日常复习中应更趋向于积累。考研作文的复习和提高是与一些科学的学习方法和有效的学习技巧分不开的，在此，万学海文考研英语辅导专家提供大家一些练习方法及技巧，希望对同学们有所帮助。

考研作文分为大、小两类。小作文多以应用文体裁为主，例如求职信、感谢信、辞职信，道歉信等，这类作文不需要复杂华丽的文采修饰，表意明确就可以了；大作文的题型多是通过图片或者提示文字，要求考生完成提示所透视出来的问题。命题范围，从近几年看，都比较倾向于当前社会热门话题或观念。

一、欲速则不达，步步行进

想要达到一定的程度，首先要向这个程度看齐。就写作来说，如果你想将自己的作文水平提高到一个质的飞跃，首先你要懂得去吸取别人文章中的精华。这个吸取精华的过程就是阅读。只有多阅读，才能够培养起良好的语感，才会知道如何去构思，如何去质疑别人的观点，表达清楚自己的意思。正所谓"读书破万卷，下笔如有神"。无论何时，大家都勿急躁，因为"跑"得好的前提是"走"，

作文这种慢火候才能提高的题更是如此，一步一个脚印才是写作稳步提高的策略。

近些年写作考题的内容和主题，基本都与当年的热点话题有一定的关系，所以平时多阅读英语报纸、杂志，能够帮助你掌握更多的话题资源。对于比较热点、比较重要的主题，可以有目的地进行搜集整理。阅读的过程也应该讲究方法，应该以泛读与精读结合的方式进行学习。一些好的文章建议你读过以后做英文阅读笔记（即观后感）。在读与写的过程中，你的写作水平自然会得到快速提高。

二、在研读中背记

除了读与写，还要进行适当的背。背诵是积极备战快速提高写作成绩的一条捷径。建议考生可以选择历年真题中的写作佳文，先是研究，思考人家是怎么构思，怎么写的，获得高分的闪光点在哪。再在理解的基础上记忆，更能够在无形中增强你的表达能力。同学们也可以拿一些英语原著名篇来读、背，这样可以加强自己的语感，使自己的表达更加地道。

三、每周一练，积累成章

表达能力需要考生平时多一点练习，给自己制定一个写作计划。一周至少练习一篇文章。在加强写作练习之后，你的文章才能够 "成章"。因此，实际动手的能力至关重要。平时训练的重点应该锁定在文章是否切题，行文是否表意明确、通顺，有无语法错误等。另外，一定要给每一次行文限定一个可行的时间。并且，按照这个时间严格要求自己完成。

如果你能够找到范文，然后在练习之后进行比较，效果会更加明显。假使没有范文作为标样，建议你可以找英语水平较好的同学看一看。也许评看你作文的这个考生英语水平不是很高，但个人看别人文章的缺点很容易看出来。如果条件允许，找老师请教一下最好。

掌握好的方法加之持之以恒，相信最后的成功一定属于你，继续坚定的考研信念，自信满满的走下去。

I have got two baby cats. they are very beautiful.

One is yellow. the other is white. they are very lovely. the yellow cat is very naughty. He likes to play with people. He often runs here and there. His favourite game is playing with balls, ropes and stones.

But the white cat is very gentle. She likes to wash her face.

And she doesn′t like to play with people. She often jumps onto my knees. I like to give her a bath.

Oh, my baby cats bring me much happiness. We are very good friends. I love them.

Hi, My name is Jay, Im from the beautiful ancient city of Kaifeng. As you can see, I am a very casual girl, and a lot of people here, like 18-year-old, I love a lot, I love guitar, love to sing love dancing, very fond of English, I am very love to watch "Prison Break", like the actor micheal clever wit I like making friends, and hope you will be able to and I have become good friends, I think I will, and you get along with.Hello, everyone, please allow me to introduce myself with a minute let you know me, know me and accept me. I come from Shandong, xxx, 20-year-old, my hometown Qilu earth gave me a straightforward character, and yet steady, and later the city of Nanjing travel long distances to school.As one saying goes: "Ten years out of sharpening sharp, sword-jun to knowledge only pending." Zaikuzailei, I am willing to try, "eat life of hardship, Fang Wei Ren Exalted", in later school life, I will definitely be one to make their own efforts, but had a substantial significance of post-secondary life. Student life in the future please give more concern, a simple self-introduction is completed, thank you!

each examiner:

i call/**, come from shandong province.this year is 21 years old, , is a student who will soon graduate.

passes the foundation knowledge that the teachers guidance controled a calculator with personal effort firmly in the school.mainly studied c language at the software aspect. c#. java etc. plait the distance language, the data structure, vf. access etc. database is applied, calculator operate system.studied the dreamweaver web page manufacture and the asp network to weave a distance also.studied the calculator network at the hardware aspect, the calculator construction with www.oh100.combine many times to attend to pack machine, set the fulfillment of the net operation lesson, make me control the work principle of the calculator and the set of the calculator network net process.

in addition, i attend various activities of the school organization to come to the oneself of 锻炼 actively and do various part-time to increase social experience.the teacher is divided into the group to us in the experiment and practice of the lesson remaining to complete mission, make we the deep comprehension arrive the importance of the team.the and the rise time acquires the school scholarship during the period of school, three staffs.

however necessarily limited at the knowledge that the school learn, therefore i would ready to take advice study in the later work, the backlog working experience, the exaltation work ability.hope your company to give me a displays an own opportunity!

this with the result that

salute

[面试英语自我介绍内容

导语：袁隆平热爱祖国、一心为民、造福人类的崇高品德，与中国共产党肝胆相照、同心同德的思想风范，下面是yuwenmi小编为大家整理的优秀英语作文，欢迎阅读与借鉴，谢谢!

Yuan Longping (born September 7,1930) is a Chinese agricultural scientist and educator,known for developing the first hybrid rice varieties in the 1970s.His "hybrid rice" has since been grown in dozens of countries in Africa,America,and Asia —providing a robust food source in high famine risk areas.

Mr.Yuan won the State Preeminent Science and Technology Award of China in 2000,the Wolf Prize in agriculture

and the World Food Prize in 2004.He is currently is DirectorGeneral of the China National Hybrid Rice R&D Center andhas been appointed as Professor at Hunan Agricultural University,Changsha.He is a member of the Chinese Acade my of Engineering,foreign associate of the US National Academy of Sciences (2006) and the 2006 CPPCC.

Mr.Yuan was born in Beijing,China.He loves playing Majong and the Erhu (Chinese violin),swimming and motorcycling.

【参考译文】

袁隆平(生于九月71930)是中国农业科学家和教育家，被称为在上世纪70年代开发第一个杂交水稻品种。他的“杂交水稻”已经在国家在非洲、美国和亚洲数十家长大，在大饥荒危险地区提供了稳定的食物来源。

袁先生获得国家最高科学技术奖的2000的中国，沃尔夫奖

2004、世界粮食奖。他目前是中国国家杂交水稻研发中心总干事并被任命为湖南农业大学的教授，他是中国科学院我的工程的一员，美国美国国家科学院外籍院士(2006)和2006届全国政协委员。

袁先生出生在北京，中国喜欢玩麻将和二胡(中国小提琴)、游泳和骑摩托车。

Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insects include some of the greatest enemies of the human race.Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals.We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.Moreover, unlike some of the other insect eaters, spiders never do the least harm to us or our belongings.

Spiders are not insects, as many people think, nor even nearly related to them.One can tell the difference almost at a glance, for a spider always has eight legs and an insect never more than six.

How many spiders are engaged in this work on our behalf? One authority on spiders made a census of the spiders in a grass field in the south of England, and he estimated that there were more than 2,250,000 in one acre; that is something like 6,000,000 spiders of different kinds on a football pitch.Spiders are busy for at least half the year in killing insects.It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day.It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.

你可能会觉得奇怪，蜘蛛怎么会是我们的朋友呢?因为它们能消灭那么多的昆虫，其中包括一些人类的大敌。要不是人类受一些食虫动物的保护，昆虫就会使我们无法在地球上生活下去，昆虫会吞食我们的全部庄稼，杀死我们的成群的牛羊。我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。此外，蜘蛛不同于其他食虫动物，它们丝毫不危害我们和我们的财物。

许多人认为蜘蛛是昆虫，但它们不是昆虫，甚至与昆虫毫无关系。人们几乎一眼就能看出二者的差异，因为蜘蛛都是8条腿，而昆虫的腿从不超过6条。

有多少蜘蛛在为我们效力呢?一位研究蜘蛛的权威对英国南部一块草坪上的蜘蛛作了一次调查。他估计每英亩草坪里有225万多只蜘蛛。这就是说，在一个足球场上约有600万只不同种类的蜘蛛。蜘蛛至少有半年忙于吃昆虫。它们一年中消灭了多少昆虫，我们简直无法猜测，它们是吃不饱的动物，不满意一日三餐。据估计，在英国蜘蛛一年里所消灭昆虫的重量超过了这个国家人口的总重量。

It is the day that the families get together.

The spring festival is usually in the February ,sometimes in January.In the spring festival,every family all paste the lucky inscriptions,they fire the cracker,they eat the dumplings.The day before the new years first day is the new years eve,same as the christmas eve,all the families get together to have the new yaars dinner,wishes each other,talk about the wishes about the new year.Small children will receive the money given to children as a lunar new year gift.

Welcome to our school! Our school is the key middle school in this city.

Now we are in the front gate. Entry in this school, you can see there is a big

football playground on the left and a big resturant on the right. If you’re

hungry, you can have something good in there. The grand teaching building is

right behind the football playground. We spend most time in the classrooms.

Behind the teaching building, there is a little lake with many fish in it. Oh,

there is also a nice library next to the lake. After the class, we can entry the

library freely to read the books we like. This is our school. Don’t you think

it’s great?

Respected business leaders:

My name is ××× , and I will graduate from Xian FanYi University in the year 2015, My major is secretary in English department.

It’s my great pleasure to have this opportunity to improve our mutual understanding. During the three –year college study, I tried my best to learn all kinds of knowledge, and weigh the hard work of my teachers and myself; I have mastered English listening, speaking, writing and reading skills.

Moreover, I have a good command of business English and the basic theory, public relationship of secretary. Meanwhile, in order to enlarge my knowledge, I always read some newspapers and magazines about business and trade, and I used to do some representative of business in my spare time. At the same time, I learnt computer skills during my summer vacation, and now Im familiar with Office 2007. It is my three –year college life that makes me form my life attitude. Also my three-year college life that makes me rich in knowledge, and its also my three-year college life that makes me form my life attitude. Honesty, Trust, Diligence is principle of how to be a man.

As a college graduate, I believe "where there is a will, there is a way", and I will try my best to do a good job in my business. So I sincerely hope that I can make a position in your company so that I can serve for the company in the future.

Yours faithfully

Dear sirmadam,

My name is Jingjing Wang and I’m from Jingmen city, Hubei Province. By the end of this June I’ll graduate from Shaanxi University of Science and Technology, located in the famous and historical city Xi’an.

I choose the major of Machinery in the future for my great interests and I have already learned all the basic knowledge of this major. As is known to all that ‘Interests is the best teacher’, I pursuit my dream of making great progress in the scientific area by competing to become a graduate student in the very famous Hunan University which is ranking on the top universities in China, more importantly, Mechinery is a highly valued major in this great university and this will undoubtedly making my dream come true !

I really admire such a great university with profound culture and abundant ability of scientific research. Moreover, the hard-working mentors are showing great patience to all students here which convince me that I’ve made the best choice of joining this Hunan University.

I appreciate it if you may provide me with such a great opportunity of becoming a graduate student here !

Thank you all !

[面试的英语自我介绍

Im very happy that we visited Xian last year.We enjoy those days in Xian very much.Xian is a great city,it has long history and great views.We went to the Xian museum,and the great two towers.I also saw the great ancient soldiers,and a lot of wonderful things.Xian also has clean and wide streets,high buildings and a lot of good food.I love the noodles!Xian is so lovely that a lot of people go to visit it.I also saw many foreign visitors,they were all very interested in Xian.I was so proud about xian,and our great country.

带翻译：

我很高兴我们去年参观了西安。我们很喜欢在西安的那些日子。西安是一个伟大的城市,它有悠久的历史和伟大的观点。我们去了西安博物馆,和伟大的两座塔楼。我也看到了古代伟大的士兵,很多美好的事情。西安也有清洁和宽阔的街道,高楼和很多好的食物。我喜欢面条!西安太可爱了,许多人去参观它。我还看到许多外国游客,他们都是西安非常感兴趣。我对西安非常自豪,和我们伟大的国家。

my name is ________. i am graduatefrom ________ seniorhigh school and major in ________. there are ________ people in my family. my father works in a computer company. and my mother is a housewife. i am the youngest one in my family.

in my spare time, i like to read novels. i think reading could enlargemy knowledge. as for novels, i could imagine whatever i like such as a well-known scientist or a kung-fu master. in addition to reading, i also like to play pc games. a lot of grownups think playing pc games hinders the students from learning. but i think pc games could motivate me to learn something such as english or japanese.my favorite course is english because i think it is interesting to say one thing via different sounds. i wish my english could be improved in the next four years and be able to speak fluent english in the future.

我的名字是________。我graduatefrom ________ seniorhigh学校及主要________。有________人在我的家人。我父亲的作品在一家电脑公司。和我母亲是一位家庭主妇。我是家里最小的一个。

我在业余时间，我喜欢看小说。我认为阅读可以enlargemy知识。至于小说，我可以想象不管我，如著名的科学家或功夫师父。除了阅读，我也喜欢玩电脑游戏。很多的成年人认为玩电脑游戏阻碍从学习的学生。

但我认为，个人电脑游戏可以激励我学到一些东西，英语或japanese.my喜欢当然，这样的英语，因为我觉得有趣的是，说的是一套通过不同的声音。我希望我的英语可以提高在未来4年，可以说在未来流利的英语。

My name is Jiao Rui. Im 9 years old. My birthday is May 16. Im a dog. My

weight is 95 Jin and my height is 143 cm. Im in grade 3 of Nanjing No.2 primary

school. My hair is black, my eyes are small, I am a single eyelid, my skin is

black. My mother said, "Im too fat.". I said, "although Im burnt and fat, Im

the fastest runner in my class. My favorite sport is swimming. shuttlecock. Play

football I like swimming best. I can swim six times in the natatorium. The coach

said I have made progress. I like not only sports, but also reading books. I

recommend Cao Wen to you

Hi, my name is xxx. Im xx years old, a middle school student apparently.

I love music very much although Im not very good at singing. Ive been playing guzheng, an ancient traditional instrument for a long time and now Im in level 10, which means a really high level among the amateurs. Apart from that, I also like to reading and writing. They both give me a lot of fun and build my unique personality as well as my goal and dream. I like Wangfei very much. She could be my favorite singer.... Personally, Ive been considering I have a really complicated personality BECause sometimes dont really like to study, sometimes.....

However, Im very positive and look forwards to my future BECause Im the one who will realize my goal.

The Moon Festival or Mid -autumn Festival is one of the three major traditional festivals celebrated by Chinese people. Like harvest time in other countries, the Mid-autumn Festival actually began as a

thanksgiving celebration, honoring the Soil God and the Crop God. This is also a time for family reunions. Chinese people enjoy moon cakes during this feast just as they eat rice dumplings for the Dragon Boat Festival. It is quite appropriate to bring moon cakes with you in token of festival greetings when calling on people during this season.

The Mid-Autumn Day

August 15th in Chinese Lunar Calendar is the

Mid-Autumn Day. It is one of the most important traditional festivals in China.

On that day people usually go back home to have family reunion. Each family will have the members get together to have a big dinner. The most popular food is moon cakes. They are round and look like the moon.

The moon is the brightest this night. People ate the delicious food while they were enjoying a beautiful full moon in their yard. At this time, some old people would like to tell many past events and tell the children a story about the rabbit. The children really believed that there was a rabbit on the moon. They wanted to go to the moon and have a look one day.

What a great festival!

中秋节

农历八月十五日是中秋节，在中国它是最重要的传统节日之一。 在那一天，人们通常回家与家人团聚，一家人聚在一起饱餐一顿。最流行的食品是月饼，它们圆圆的就像月亮。

中秋节晚上的月亮特别地圆。人们都在自家的院子里一边赏月一边吃着可口的月饼。这个时候；一些老人会讲述许多古老的故事，如月亮上的玉兔，孩子们信以为真，他们真想有一天登上月球看个究竟。 中秋是个美好的节日啊 !

[难忘的中秋英语作文

My mother has a pair of keen eyes which can speak. With her eyes,she observed my mood, gave me courage and made me strong. Therefore, I could face difficulties.

When I was a baby learning to walk, my mother always lent me a hand and encouraged me to get up while I fell down. As I finally threw myself into her arms, her eyes smiled with praise. Later as I grew up, I met with more difficulties. But whenever I was frustrated, my mothers eyes always

gave me hope and encouragement. Once I failed in exams, my mother encouraged me to find out the reasons. Instead of blaming me she pushed me to do better. At last I overcame the difficulty. Now I have grown up and become more independent, but whenever I come across setbacks, my mothers eyes are always with me encouraging me wherever I go.

我母亲有一双敏锐的、会说话的眼睛.那双眼睛能洞察我的心情,给我鼓励,促我坚强,因此我能面对一切困难.

孩提学步时,妈妈总是帮助我,鼓励我摔倒了就爬起来.最后我晃晃悠悠地扑进她怀抱时,她的双眼充满了赞扬之情.成长过程中,我遇到了很多困难,但灰心失望时,妈妈的双眼总给我以希望和鼓励.一次我考试不及格,妈妈没有责备我,而是鼓励我找出原因,提高我的成绩.最后我终于度过了难关.现在,我长大了,不用再让她操心了.但每当遇到挫折时,妈妈的眼睛总是伴随着我,给我鼓励

My name is thumer o, 8 years old this year. I live at 79 king street shop. My hometown is liu first, where the scenery is very beautiful. I was in the sea bo experiment elementary school, I read three class 2. Has good grades have been, every time take miyoshi students. My strengths are many, such as painting. Once, I drew a picture, and showed everyone. Everybody said I really like painting better than. I also love reading. Others lend me a book, I could see god. Friend called me, I also cant hear you. Therefore, they called me a nerd. This is me, a Renaissance man.

我叫刘彤，今年8岁了。我住在王铺街79号。我的家乡是刘佰先，那里景色十分美丽。我在海博试验小学读书，我读三2班。一直以来成绩都不错，每次都拿三好学生。我的长处很多，比如说画画。一次，我画了一张画，拿给大家看。大家都说我画得比真的还像。我也很爱看书。别人借我一本书，我看得出神。朋友叫我，我也听不见。因此，大家叫我书呆子。这就是我，一个多才多艺的人。

hello,everyone!

my name is xxxx is my english name,which is also the name of my idol.i’m a recommended student from ccfls,in which i have studied for six years.during the time i stayed there,i’ve learned a lot from the teachers who i must thank sincerely.another school in my life is my family.1990 witnessed me born in a happy family.i was treated as the apple of my family members’ eyes since childhood.genuineness,perseverance,conscientiouness,the urge for improvement are the characters my family gives me.today,but for their support,i would not be this confident.many thanks to my family.i love them all.

i’m an optimistic,energetic,outgoing,active,humorous girl with any amount of hobbies,such as listening to music and writing my blog.what deserves to be introduced is my blog on sina,which takes me a lot of pains.it’s without much gaudy decorations,but many articles which are really worth reading.the website address is here.your prensence and guidance are requested.

unlike many other girls,i’m quite good at sports.swimming,skating,basketball,volleyball,badminton,table tennis and etc. are my preferences.in spite of my height,i have a good jumping capacity.due to this,i’m the captain of the female basketball team and the principal member of the female volleyball team in our school.in addition,i’m fond of playing chess.i’ve got a silver medal when i was a child.futhermore,i’m a very versatile girl.piano and clarinet are my forte.they all get the ninth level.besides,i’m a good organizer and leader in the school activities.i organized many english speech contest,also took a part in it and ranked among the best.especially,i directed an english play called“the sound of music”,which is a gorgeous success,so that every audience spoke highly of it.i’m very proud of that.

to conclude,i’m sure i won’t let you down.i hope that you can give me a chance to study in xiamen university,which is the shrine in my mind, and i’ll give you much glory in return.

that’s all.thank you for your attention.

I like dancing very much. I learn to dance from four years old. Until now,

there are already nine years. I take part in many activities, because I think I

want to perform in front of people. I have a good dance teacher. She dances very

well. She is strict with me. Once I make mistakes, she points it out directly. I

learn a lot from her. Now, we are good friends. She always encourages me. I

think dance is good to me. I make many dancing friends. And it’s good way to

build my body.

My name is . I am from . There are people in my family. My father works in a com#puter com#pany. He is a com#puter engineer. My mother works in a international trade com#pany. She is also a busy woman. I have a older sister and a younger brother. My sister is a junior in National Taiwan University. She majors in English. My brother is an elementary school student. He is 8 years old.

Hello,everyone. My name is giffer and Im 12-year-old .I am Very pleased to be admitted to the Xicheng Foreign Language School. My favourite subject is Chinese and English. My hobby is blown flute and reading. There is also a very good Orchestra here. The school orchestra and this will allow me to learn a lot of knowledge in this three years. I want to study well. To give our parents and ourselves a satisfactory answer at this holiday. I took part in the training of the orchestra. Participated in the torch relay Task. I will Learn a lot and I hope that I can learn more knowledge at this secondary school.

参考译文:

大家好，我叫giffer，今年12岁。很高兴今年考上了西城外国语中学。我喜欢的科目是语文、英语、我的爱好是吹长笛、看书。在这里也有一个很好的管乐团.这个学校和这个乐团能让我学习到很多知识.在这三年里。我要好好学习，给自己和家长一个满意的答卷，在这个假期，我参加了管乐团的训练，参加了火炬传递的任务，学到了很多东西，我希望我能在这所中学学到更多的知识。

考研复试英语口语一般涉及这样几个话题，象自我介绍、家乡和大学的状况、研究生期间的科研设想等等。如何在这些地方让老师满意呢？下面这些话题的模板和范文，供广大考生参考。

自我介绍

Good morning. I am glad to be here for this interview. First let me introduce myself. My name is ***, 24. I come from ******, the capital of *******Province. I graduated from the ******* department of *****University in July, 2001. In the past two years I have been preparing for the postgraduate examination while I have been teaching *****in NO. ****middle School and I was a head-teacher of a class in junior grade two. Now all my hard work has got a result since I have a chance to be interviewed by you。

I am open-minded, quick in thought and very fond of history. In my spare time, I have broad interests like many other youngers.I like reading books, especially those about *******. Frequently I exchange with other people by making comments in the forum on line. In addition, during my college years, I was once a Net-bar technician. So, I have a comparative good command of network application. I am able to operate the computer well. I am skillful in searching for information on Internet. I am a football fan for years. Italian team is my favorite. Anyway, I feel great pity for our countrys team。

I always believe that one will easily lag behind unless he keeps on learning. Of course, if I am given a chance to study ****** in this famous University, I will spare no effort to master a good command of advance ******。

Good morning, my dear teachers, my dear professors. I am very glad to be here for your interview. My name is Song Yonghao, I am 22 years old. I come from Luoyang, a very beautiful ancient city. my undergraduate period will be accomplished in Changan university in July, 2004; and now, I am trying my best for obtaining a key to Tongji University。

Generally speaking, I am a hard working student especially do the thing I am interested in. I will try my best to finish it no matter how difficult it is. When I was sophomore, I found web design very interesting, so I learned it very hard. To weaver a homepage for myself, I stayed with my personal computer for half a month, and I am the first one in my class who own his homepage. Furthermore, I am a person with great perseverance. During the days preparing for the first examination, I insist on running every day, no matter what the weather was like. And just owning to this, I could concentrate on my study and succeeded in the end。

Well, in my spare time, I like basketball, tennis and Chinese chess. Also English is my favorite. I often go to English corner to practise my oral English on every Thursday, and write compositions to improve my written ability. But I know my English is not good enough, I will continue studying。

Ok, that is all, thank you for your attention。

[考研复试英语口语自我介绍经典作文