如何写说明文初二200字作文（说明文怎么写五年级200字左右） - 学习作文网

如何写说明文初二200字作文【一】

电脑

五年级陈丽媛

提起电脑，相信大家都非常熟悉。电脑又叫电子计算机。如今，随着科技的发展，电脑已走进千家万户。

电脑一般分为两大类；一类是个人电脑，个人电脑有台式的，笔记本的，最新式的是平板的。另一类是超级电脑，每秒的运算速度在亿次以上，主要用在银行、科研、军事等方面。

电脑由硬件系统和软件系统组成。电脑的硬件系统主要由主机、显示器、键盘、鼠标、音箱、摄像头等组成。主机就是电脑的主管，就像我们的头脑，控制着电脑每天的工作。显示器就像我们的眼睛，把所有工作的成果展示给我们看。键盘上有26个英文字母键，方向键，数字键和几个重要按键，是电脑主要的输入设备。鼠标就像一只老鼠似的扒在桌子上，可是作用非常大，可以灵活地指挥各种应用程序。音箱可以带领我们进入美妙的音乐世界。摄像头可以让我们足不出户，与世界各地的人们交流。电脑的软件系统分为两类；一类是操作系统软件，主要有windows操作系统和Linux操作系统等，最原始的是dos操作系统。它们是计算机底层的系统软件，负责管理、调度、指挥计算机的软硬件资源使其协调工作，没有它，任何计算机都无法正常运行。它在资源使用者和资源之间充当中间人的角色，举个例子，一个用户（也可以是程序）将一个文件存盘，操作系统就会开始工作：管理磁盘空间的分配，将要保存的信息由内存写到磁盘等。当用户要运行一个程序时，操作系统必须先将程序载入内存，当程序执行时，操作系统会让程序使用CPU。另一类是应用软件，可以办公，也可以游戏，还能保证安全等等。

电脑的用途很多：可以上网，例如聊天、发邮件、听音乐，玩游戏、登Q、查资料等；可以管理资料，比如学校的图书室里的电脑是用来登记图书借出去情况的；可以记帐，比如超市里的计算机，就是拿来记帐的；还可以控制生产，比如水泥厂里的电脑能自动控制生产。瞧，电脑真是各方面的能人！

电脑与人们的生活息息相关，让人们的生活变得更美好。

指导老师林蔚文

如何写说明文初二200字作文【二】

说明文是以说明为主要表达方式用来说明事物，阐明事理的`一种文体。它通过揭示概念来说明事物的特征、本质及其规律性，给人准确的科学知识或正确思想。一般可分为实体事物说明和抽象事物说明两大类，词典、教材、论文、实验报告、产品说明书、广告、解说词及科学小品等都属于说明文。

按写作方法,英语说明文主要分为下面六种类型

1.例证法 2.定义法 3.分类法 4.因果关系法 5.比较对照法 6.过程分析法

1.例证法

Our life today depends very much on energy. For example, machines have made our life easier than it used to be. The machines use energy, and energy is needed for heating, lighting, communications, carrying goods-everything. Factories use a great deal of energy to make the things that we use and buy and sell.

这段主要是讲能源问题。第一句为主题句,概括地说出"我们目前的生活很大程度上依赖能源"。接着用举例的方法从三方面说明能源的作用。

2.定义法

An ideal teacher must have the following characteristics. He should know his subject, but he can make mistakes if he is willing to learn. His personality is as important as his scholarship. An ideal teacher must be enthusiastic. He should be a bit of an actor and he shouldn't be afraid to show his feelings and express his likes and dislikes. An ideal teacher is one who grows, learns, and improves himself along with his students.

本段的展开是通过对"一个模范教师"下定义的方法,关键词"ideal teacher"在文中多次重复,能加深读者的印象。

3.分类法

As far as political views are concerned, people fall into three categories. First are the conservative people. Conservatives are opposed to sudden or great changes. Second are the liberal people. These people are in favour of progress and reform. But their opinions often seem too idealistic. Third are the moderate people. The moderates keep everything within reasonable limits. They are more practical in this hard world. In my opinion, most people seem to belong to this group.

本段把人按政治观点分为三类:保守派(conservative people、自由派(liberal people和温和派(moderate people,并对他们各自的特征进行了简要的分析。

4.因果关系法

Of the four seasons, I like spring best. I prefer spring because it is a season of much joy and gaiety. New life bursts out everywhere. Plants wear a green coat again and colourful flowers blossom in gardens and mountains. The old come outdoors for fresh air and the young plan for outdoor activities. Life becomes so energetic and happy.

第一句为本段主题句,末句是总结句。在主题句后, 作者用了四个句子阐述自己喜欢春天的理由。

5.比较对照法

I like having a twin sister. When she's happy, I'm happy. When she feels unhappy, I feel the same. Often, I know what she's going to say. Sometimes, I know what she's thinking. I like what she likes. I hate what she hates. We like the same music, the same food and the same books.

这段采用AB交错的比较方式,阐述孪生姐妹的相同特征。这种写法较流畅自然,给读者的印象也更鲜明突出。

6.过程分析法

There are several steps to plant a tree. First, dig a hole large enough for the tree, but the hole should not be too deep. Second, put the tree in the hole so that it is straight. Third, put the earth back into the hole again. Push it down hard with your foot several times. Finally, water the tree well, as often as possible.

这段分析了植树过程中的几个步骤。全段层次分明,连接词语(first, second, third, finally的使用加强了语句的连贯性。

Exercises

例１请根据Wang Hua 在学骑自行车时的几个步骤，写一篇短文，说明他是任何学会骑自行车的．

参考词汇： handle-bars 自行车把手 pedal 踏板 saddle 车座

Wang Hua is learning to ride a bicycle. Let’s watch him and see how he can get on his bicycle. He put his hands on the handle-bars. He puts his left foot on the left pedal, then he pushes himself hard forward with his right leg. Now he can move on together with the bicycle and his whole body is now on the bicycle. Then, he raises his right leg over the saddle and lower himself on the saddle. Now, he is on the bicycle and stepping the pedals hard with both legs. And the bicycle is going forward.

例2

请写一篇短文介绍如何乘坐伦敦地铁．

内容提示如下：

1. 在售票处（booth购买辅币（token需30便士．

2. 在入口处将辅币投入狭孔（slot，你就可以走下地铁．

3. 在站台等车时，要站在白线以外．注意你要去的方向．不要站错站台．

4. 上下车应迅速，因为车门关闭很快．地铁内规定不准吸烟．

注意：短文的意思要连贯．字数：100个左右．

If you want to travel by underground in London, you should first find the nearest underground entrance and buy a token for 30 pence in the booth. After you drop the token into the slot at the entrance, you can walk down the stairs. Stand back of the white line while waiting for the train on the platform. Make sure that you are on the right side of the platform for your train. When the train arrives, get on or get off quickly because the doors of the train close quickly. Smoking is not allowed in the underground.

例3

家用电脑体积下，价格低，造型优美，简单易用，使用方便，灵活；可用于计算，记事，打电话，打印信件；儿童可用它来学英语，做游戏．你通过家用电脑能学会怎样使用微机；为将来寻找工作提供便利；电脑工作比人快数百倍；我们已经得到电脑的巨大帮助．请根据以上内容写一篇介绍家用电脑的说明文．字数120左右．

A Family Computer

A family computer is small. Its price is not high, and it has a good look. It can be used easily. You can calculate, make notes, call others and type letters, etc. Also, children can learn English or play games with it. Besides, you can use a family computer as a training computer. You can learn how to use an office computer, which can give you convenience to find a good job in a company. Computers can work hundreds of times faster than humans. We have been greatly helped by

computers.

例 4

请以The Importance of Trees 为题写一篇短文，说明保护森林的必要性．

1. 说明树木的主要用途：提供木材；吸水，防止水灾，旱灾；净化空气，美化生活．

2. 滥伐树木的危害；无计划砍伐造成水土流失，土壤沙化，造成水灾．

3. 每年都应植树造林，使其为人类更好服务等等．

字数：100左右．

As we all know, trees are very useful. They are of great benefit to man as follows. First, trees provide us with wood and other products. Second, their roots can allow the rain to sink in and keep the soil, so they help to prevent droughts and floods. Trees can help clean air and beautify life.

Unfortunately, nowadays in many parts of the world lots of people fail to realize the importance of trees. They have cut trees down in large numbers without a plan, which makes the soil washed away. They don’t know where there are no trees, the rain washes away the surface of the soil and this causes floods.

We ought to plant trees each year and carefully look after new trees in order not to make the forest slowly disappear. Only in this way can we make the forest serve man forever.

例 5

根据下表格提供的信息，请你推荐两本学中文的词典．

Dear Steve,

I’m pleased to learn that you and your classmates are learning Chinese. I’d like to recommend the following two dictionaries. The English- Chinese Chinese-English Dictionary is really a good one for beginners. It has 18,000 English words and 20,000 Chinese words. Besides plenty of examples, it has many notes telling you how to use a word. Xinhua Dictionary is the most popular Chinese dictionary, and it has a vocabulary of 10,000 words. It may also be useful to some advanced learners of Chinese. Of the two, ECCED is the more expensive, costing 52 yuan, and XD costs 11 yuan.

Please let me know if you want me to buy these dictionaries.

Yours, Li Yua

如何写说明文初二200字作文【三】

1.时间顺序：按时间先后顺序安排文章。说明事物的变化、发展、成长过程，说明物品的生产程序和使用程序，介绍人物传略常常采用时间顺序。

2.空间顺序：介绍建筑物等静物一般按空间方位的顺序安排文章。首先要确定观察点，或俯视、或仰视，或远眺、或近观，按一定方位，从前后左右，上下四方，内外中心来说明事物。

3.逻辑顺序：按事物内部的联系安排文章。一般事理说明文多用这种顺序。如因果关系、由现象到本质的层递关系、主次关系、总分关系、并列关系、相关关系。

如何写说明文初二200字作文【四】

美食DIY课程开始了，我们学习做包子，虽然我不爱吃，但这项技能挺有用的，能让我们的动手能力增强等。

我表哥说小升初面试的真题中有番茄炒鸡蛋怎么做？说不定我考试时有包子怎么做呢？好了，废话不多说，来看看包子怎么做吧。

第一步，准备好食材与工具，面粉五百克，糖二十克，酵母十克，泡打粉十克，清水或温水适量，盆一个，蒸格一个，香菇一百克，青菜三百克，盐二十克，菜板一个，擀面杖一根。

第二步，将青菜与香菇洗干净，烂菜叶扔掉，因为香菇蒂硬的像石头，所以扔掉，一定要洗干净。

第三步，将洗干净的菜与香菇切成小颗粒，不能太大，要小一点，大约半个小指甲盖儿那么大。

第四步，在青菜粒与香菇粒中放盐，这样能把他们的水分排出去。

如果不排，蒸好后的包子里就会全是水。

等一两分钟用手把青菜与香菇中的水分挤捏干，放在旁边备用。

第五步，把面粉倒在盆中，先把面粉做成像盆的样子，然后把酵母、糖都倒在中间，面粉上洒一圈泡打粉，加入适量清水，揉成像雪花、白棉布一样的样子，不要觉得粘手，多揉一会儿就好了。

第六步，继续加水揉面团，重复的一直揉，直到面团不干不湿，面光手光盆光，这时的'面团就像一只又大又肥的白鹅的身体，十分有光泽。

第七步，将面团搓成长条状，分成大小相等，十分均匀，大约40克的小剂子。

第八步，将小剂子擀成中间厚，四周薄的圆片，然后在中间放入做好的香菇青菜香菇馅料，一手拿着皮，一手捏出褶皱，最后封口，后面的以此类推。

第九步，每个包子大约隔两手指的距离，放在蒸锅里蒸熟。

第十步，大约10分钟后，大功告成。

可以吃了，我一口咬下去十分的美味，我也很开心，哈哈哈哈。

如何写说明文初二200字作文【五】

俗话说的好：“不爱惜时间，就等于不爱惜生命。”由此可见，时间是多么的珍贵，多么的重要。但，要如何把握时间，将每一分、每一秒都用上呢？

首先，我们要先规划行程表，写出一天中想做的事。因为如果没有明确的记录下来，就没办法有效率的完成所有工作了。

下一步，也是最重要的一件事──有效率的实行，将行程表上的`工作，一步接着一步的完成，而且要把握每一刻，让事情能更快解决。例如在等公车时可以多看点书，丰富自己的知识；休息时间可以帮忙打扫，让整个家变得一尘不染，这些正是善用时间的好例子。

总而言之，我们要好好的利用时间，充实生活。就因为时间是一去不返的，所以只能把握住每一刻，不能只是想着要再拖一下，才不会一事无成。

莎士比亚曾说过：“时间的脚步，不会因为我们有许多事情要做，而稍作停留。”因此，我们更应该要好好把握我们所拥有的时时刻刻，努力当个能珍惜时间并善用时间的好主人吧！

如何写说明文初二200字作文【六】

写说明文，一定要对说明对象有比较深刻的认识，即抓住说明对

象的特征。什么是事物的特征呢？特征就是某事物区别于其它事物的象征和标志，即该事物所特有的个性。它往往表现在两个方面：一是外显性特征，如事物的颜色、质地、空间位置、形状、温度等；二是内隐性特征，如事物的成因、原理、变化过程、内部结构、习性、性能、风格等方面。

那么怎样才能把握住事物的特征呢？必须从以下几个方面着手：一要认真观察。通过细致、反复、深刻的观察，用眼、耳、口、鼻、体、肤等感觉器官，对要说明的事物进行看、听、尝、嗅、触等，必要时，还可以做实验，以准确、全面地把握事物的特征。二要深入思考。将说明对象和类似的事物进行多方面比较，对掌握的有关信息进行筛选，深入分析其异同，抓住了“异处”，就把握了该事物的特征，也就抓住了说明的重点。三要重视积累、扩大生活视野，阅读范围，不断丰富知识，积累写作材料，注意间接的获得，提高理性认识水平。