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
To see a world in a grain of sand,
And a heaven in a wild flower,
Hold infinity in the palm of your hand,
And eternity in an hour.
一沙一世界,
一花一天堂,
手中即无限,
永恒亦短暂。
安东尼·罗宾认为:每个人心中都有一个巨人,那就是你身体内的无限潜能!如何唤醒孩子心中的小巨人,激发孩子学习的潜能呢?那就是永远使孩子乐于去做你所建议的事。
让学生乐于去学习,并完成任务,不应该来自教师的强迫。每个人从内心来讲,都喜欢指挥他人而不是听命于人。我们安排学习任务时,最主要的就是要激发学生学习的强烈需求。每个学生都是一个独立的个体,作为一个教师,在教学过程中,要针对孩子的个性进行区别教学,要面向全体学生,更要让学生喜欢上你的课,喜欢你,让孩子像花儿向往阳光一样,迫不及待的希望在你所教的学科里有所成就,有所收获。这就要求我们教师在备课时,努力在教材中寻找学生感兴趣的东西,让学生主动学习,亲自去发现某种东西,并让他们把知识运用到生活实际中,学生收获到了知识,也到了成功的快乐。那么,学生对以后知识的获取会变得更加有兴趣,更能激发他们学习的***。
让孩子乐于学习,要消除学生学习时的恐惧感。我教学以来,与学习困难的学生有过很多次沟通,通过交流发现有的孩子不愿意学习的原因。主要就是:他们对学习充满恐惧,每当学习新知识,还没有开始学习,就已经在担心自己能否学会,带着对自己的强烈怀疑去学,效果就可想而知了。课堂提问时不敢开口,害怕回答错了,同学笑话,老师批评。学生过分的担心自己学不好,导致产生恐惧,而恐惧则使孩子学会回避、躲藏,而不是迎接挑战,不畏困难。
孩子对学习的恐惧情绪主要来源于缺乏自信。学生缺乏自信,害怕做不好一件事,因而划地自限,使无限的潜能化为有限的成就。孩子在学习上的不自信,对自己的怀疑,限制了本身的潜力,就象一颗明珠蒙上了灰尘。我们所需要做的就是,抹去灰尘,让明珠发出灿烂的光辉。树立孩子的信心,使他们对自己充满自信,在这时就显得尤为重要。首先,作为一个教师要做到永不对学生失望,决不吝啬自己的表扬和鼓励。学生在成功时需要教师的表扬,在失败时更需要教师的安慰和鼓励。对于孩子来说,我们在他们取得一些成功时,适时的赞许或者一个微笑都会使他们更自信,自信自己一定能做的更好。当孩子失败时,老师的一声鼓励,会让孩子重新振作起来。其次,教师要了解每个学生,善于给他们展示自己才能的机会,让他们在同伴面前大显身手,让他们体会到成功的喜悦,也就增强了自信心。所有的孩子都有自己的舞台,他们之所以还没有表现出来,一个主要的原因就是缺乏自信,一旦这些孩子找到自信,他们一定会发出自己灿烂的光来。
激发孩子的潜能,让他们乐于去学习,还要多关注学生,不因对一个孩子成绩的失望,而把他忽视,每次提问都不理他,这样做足能扼***一个孩子的未来。在教学时,要使每一个学生感到自己一直都得到老师的关注,充分地调动学生学习的参与热情。比如,进行提问与小组活动时,要给予每个学生机会,对于学困生,只要他们能积极参与就表扬。当每个学生回答完问题后,老师还应及时予以正确的评价和鼓励,以提高他们的自信心。关注学生还要在生活中多关心他们,教学以来我发现,孩子也有自己的世界,他们也有自己生活的圈子,父母,老师,朋友都对他们有很大的影响,有时在我们看来很小的一件事,就会对一个孩子有很大的影响。比如:父母的责骂、与朋友的争吵,心爱玩具的损坏等,都可以让他们在很长时间里无所适从,这时就要求我们细心地发现他们的小悲伤,并及时的开导,让孩子回到快乐的轨道中来。
激发孩子学习的潜能,我们作为一个教师,一定要全身心的投入到教育工作中,爱学生,关心学生。告诉学生,他们有自己的潜能,有自己的优势,可以做到他们想做的所有事,给他们希望。我实在想不到,唤醒孩子心中的潜能,让他们也可以达到光辉的未来,有比给他们希望更重要的了。
让孩子爱上学习,学习中的兴趣是最重要的。假如,一位学生喜欢奥数,你给他出很难的奥数题,他也会去做,就算做到汗流浃背,满头大汗,他还会坚持。相反,如果给他不喜欢的题做,他坐着不到十分钟就会感到烦躁。十四岁之前,是智力定格期,做我们感兴趣的事情,对于我们的发育非常重要。我们希望家长多让我们学一些我们喜欢的东西,而不是强制性的去围棋,书画,音乐,舞蹈班什么的。
还有,我们希望能得到家长更多的关心和鼓励。虽然有时我们努力了,但仍然没有做得更好,我们多么希望家长这时能给我们认可和鼓励。这样能增加我们的信心和勇气。
另外,我们自己也要端正好学习态度,我们学习不是为了老师,也不是为了家长,我们是为自己而学习的。只有我们认真地学习,我们才能变得更加强大,长大以后才能更好地工作生活,才能报效祖国。
我们的健康成长,离不开自己的勤奋和努力,也离不开老师和家长的鼓励和关心。
坐在电脑前,敲敲键盘,按按鼠标,几秒钟之后,眼前便出现了色彩缤纷、畅通无阻的网络时世界,也可作为知识的太空、学习的海洋。那可真是“天高任‘我们’飞,海阔凭‘我们’跃”了。在这个世界里,我会比书中飞得更迅速、游得更舒畅,也学习得更快,学习得更广,学习得更好!
我们要查找学习资料,上图书馆查固然好,但在网上查不是更快?查书要一本又一本地翻阅,但上网学习时,只要正确地输入几个字,就会马到成功。相比之下,上网更有优势,不是吗?那查找资料一日千里的速度令人折服!
电脑网络真像其词顾名思义一样——用一张网把世界络围住了。大千世界,无奇无有,大到宇宙之广,小到原子之微,都在这包罗万象的电脑网络里。网络给我们开拓了一个广阔的世界,崭新的世界。即使再小的学习问题,它也具有广泛性,它能使我们更清楚地看见这个世界。那认识世界的广阔无边的空间使人惊异!
从原始的打绳结,到方便的算盘,至今到高科技的计算机,这一切都表明世界在前进,这些也都有助于进步的因素——学习。在网上学习,无论是从它的快、广,还是别的方面,都可总结为一句话:我们会学得更好!
如今,电脑网络一步步接近我们的世界,我们也要利用网络学习,了解世界,开创美好的未来!
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
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