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
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
当新学期来临时,许多学生对新生活表现得很兴奋。在大学,新生快乐地享受着自由。在接下来的四年里,他们希望过着高中描绘的'美好生活。但事实是,大学生活中有很多东西要学。
First, the major knowledge occupies the most important role. As a student, learning knowledge is their job, while many students focus on playing cellphone in the class, or just sleep. They lose interest in studying when they come to the free environment. Mastering the professional skill helps them to be competitive. The sad thing is that most of them can't realize it.
首先,专业知识占据着最重要的角色。作为一名学生,学习知识是他们的工作,而很多学生在课堂上玩手机,或者睡觉。当他们来到自由的环境后对学习失去了兴趣。掌握专业技能帮助他们提高竞争力,可悲的是,大多数人没有意识到这一点。
Second, as there is much free time, they can make use of it and gain the valuable experience. Students can join some clubs to develop more interest, or find part-time jobs. It is better than to stay in the dorm and play computer games all the time.
第二,由于空闲时间多,他们可以充分利用好这些时间,并从中获得宝贵的经验。学生可以参加一些活动来发展更多的兴趣爱好,或找份兼职工作。比呆在宿舍玩电脑游戏好多了。
A lot of students feel lost in the campus, because they don't plan campus life well. The things you learn will make you different in the future.
很多学生因为没有计划好校园生活在所以迷失了。所学到的东西会让你在未来有所作为。
(1 模版1
Different people have different views on_____.Some people think that_____,whereas others aegue that __________.
As far as I am concerned, I agree with the opinion that ___________.For one thing,I firmly believe that ___________.For another,_____________.Just think of________,who/which_______.
Taking all these factors into consideration,we may safely come to the conclusion that______.Only if_______can we _______,just as the saying goes,________________.
(2模版2
In recent years there have been many reports of ________.It turns a new chapter of _________in China,and will have far-reaching effects in the forthcoming years.
The biggest benefit,in my eyes,is that_______.In addition,_______.Finally,______________.
Apart from the benefits mentioned above,we should also face several unavoidable challenges.In the first place,_____________.In the second place,________.What’s more,_______________.In summary,we should_______________.
(3模版3
Nowadays more and more ______are commonly and widely used in everyday life,ranging from __________to_____________.
The popularity of _______will have a great influence on ______.On the one hand,_________.On the other hand,__________.
To conclude,____________are just like a double-edged sword.With them we may________.However,one point should be kept in mind that we should make sensible use,always being a master instead of slaving of them.
写景时必须按照一定的顺序来写,才能使条理清楚,才能让读者欣赏中的优美景致。我们常用的顺序有以时间为序和以空间为序两种。
以时间为顺序,就是以时间的先后来描写景物。主要表现在描写同一景物时,突出景物在不同时间、不同季节发生的变化。例如一天之内的早、中、晚,一年春,夏,秋,冬四季……
例如董铃同学《小路》一文中的描写:
在宽阔的大路旁,有一条不引人注目的小路。
温暖的春天,微风吹拂着,小路边小树上才发出一点点嫩绿小芽的树枝。乌黑发亮的小燕子,“叽”的一声,像离弦的箭飞过了小路。含苞未放的小野花快要开了,小草偷偷地冒出了地面,显得非常娇嫩,给小路增添了许多生趣。
夏天,野花开了,散发出一阵阵清香。远远望去路两边的小草郁郁葱葱,配上黄色的野花,好看极了。天气闷热,有些人在路边的大树下乘凉,享受着着甜蜜的快乐。暴雨无情地打在小路上,小草小花没有屈服,毅然挺立在风雨之中。小路一片泥泞,我踏着泥泞的小路向学校走去。
凉爽的秋天,金黄的谷穗沉甸甸地低下了头,高粱红了脸,小路上的小草变黄了。野葡萄野熟了,摘一个,酸甜可口,好吃极了。小路也变成金黄的了。
寒冷的冬天,西北风呼呼地吹着树枝来回摇摆。我迎着刺骨的寒风走在小路上。天上飘下白莹莹的小雪花,小路变成了银白的路。小路上留下一串串深深的脚印。雪渐渐地盖住我的脚印。
这篇作文按照春、夏、秋、冬四个不同的季节,描写了小路景色的变化。小作者观察细致,抓住了小路各季节的不同特征。这条小路是小作者非常熟悉的景物,所以小路在他的笔下充满生机,“活”了起来。通过作者的描写我们看到了萌动的春天,小草“偷偷地冒出地面”;暴风雨的夏天,“小草小花没有屈服”;凉爽的秋天,“小路一片金黄”;寒冷的冬天,“小路变成了银白的路”。
写景还可按景物的空间顺序来写,如左,右,前,后,东,西等方位。或由远到近,或由近到远,或由上到下,或由下到上,还可以按游览顺序来写。
例如苏雁同学《登青秀山塔》一文中的描写:
秋末冬初,天高气爽。星期天,爸爸妈妈带着我们和哥哥来到青秀山公园参观游览。
刚一进门,我和哥哥便向那塔跑去。来到塔脚,举目仰望,才发现比在远处看见的更雄伟,更高大。塔是八角形的,共分九层,塔身直插苍天。塔的每层都有彩色的琉璃瓦檐角,角下垂挂着金色的风铃,这漂亮的小巧的风铃儿,在微风中时而发出美妙动听的铃声,吸引游人停住脚步欣赏一会儿。随后,我们便进入拱门的塔门,开始攀登了。
塔的梯子真奇特,是螺旋形的,像个巨大的螺丝钉。……从窗口往外望,每层的酱色都不一样。第二层看到的是四周郁郁葱葱的树木。第五层可看到整个青秀山的面貌了,还可以望见江水由西向东奔流而去。……
越往上登,窗户越小,风声却越来越大,我的帽子差点被吹掉了。到了顶层往下看:江边的公路细得像根管子,马车、行人都小得像蚂蚁,旁边的房子成了火柴盒。
步出塔门,我们还依依不舍地瞧那风铃。……
小作者是按照从外到内、从低到高的顺序写了塔的特点,和登上塔顶向下俯视看到的情景。脉络清晰,层次分明表达了自己所看所想。
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