如何利用网络资源学习作文【一】
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
如何利用网络资源学习作文【二】
看，一张张雪白的纸被人丢弃在冰凉的地上;听，一滴滴晶莹的水滴在没有扭紧的水龙头里流逝。
大街上，一张张看完的报纸、用过的白纸，一罐罐喝完的易拉罐随地可见;学校里，厕所的水龙头没有关紧，一滴滴水随着时间的流逝，慢慢的积少成多。大家都在操场上，空无一人的课室里亮着所有的灯;家里，多开了不必要的灯，洗澡时没有节约用水等。而对此，有些人不是那么在意，他们认为滴一点水，多开几盏灯，丢弃一两张纸都没有关系。但是大家因该明白积少成多这个道理，如果每个人都这样想，那我们该损失多少资源。大家也因该明白地球的资源也不是无限的，大家要节约使用。
当然，节约资源，也不是一朝一夕的事情，要从小开始养成。
妈妈从小教育我要节约，不要浪费。洗菜用的水我会把它们拿去浇花，如果用不完，就把它们倒到厕所的桶里;用过的废纸我会把它们订成一本本子做我的草稿本。报纸呢，看完后我会把它们放置好，如果需要擦窗就把它们拿出来用;洗脸时，我会把水倒在盆子里，听说这样可以节约水，而且方便把水倒在厕所的桶里;出门时，我总会带一个环保袋，绝不用塑料胶袋。相信大家都明白，塑料胶袋即不环保又不卫生;而那些喝完的饮料罐、不用的纸皮等废物，我会储存好，有空时拿出来拼装，把它们制作成科技作品。
节约资源，让我们一起保护地球。
如何利用网络资源学习作文【三】
水是我们生活中必不可少的资源。没有了水，一切都是脏的；没有了水，人的生命将会中止；没有了水，地球上的一切都不复存在。
今天，我跟随着红晚小记者的工作人员走进了农博会的展厅，当走到设施农业站台，看到在桌子上一个奇怪的柱子在不停的伸缩，我立刻就被这奇怪的现象吸引住了。我凑上前去观察这个柱子。我发现：这根柱子在伸出来的时候还喷洒着小水滴，滋润着旁边的植物。它的伸缩及其有规律，每次伸出来还必定伴有小水滴。
经过工作人员细心的讲解，我知道了这根柱子叫喷灌，一个完整的喷灌系统一般由喷头，管网，首部，和水源组成的。
喷灌是借助水泵和管道系统或利用自然水源的落差，把具有一定压力的水喷到空中，散成小水滴或形成弥雾降落到植物上和地面上的灌溉方式。使用这种喷灌方法非常的节约水，因为喷灌可以自由的控制喷水量和均匀性，能保证所有植物都可以吸收到水，喷灌比漫灌节省水量大约在百分之五十左右，省水还意味着节约动力，降低灌水成本。
听完工作人员的讲解我一直在想，如果全国人民都在用这种喷灌系统呢？会有多少节约下来的水呢？如果是这样，多少喝不上水的偏远地区能喝上甘甜，解渴的水呢？我暗暗发誓，以后一定要设计出比这更节约水资源的灌溉系统。让全国人民都过上不缺水的生活。
节约水资源吧，水是我们生活总必不可少的东西，我们也只有一个地球，保护水资源，人人有责。
如何利用网络资源学习作文【四】
水，是生命之源，是生命之母，是人们生活中必不可少的一部分。生活离不开水，但有些人们非但不节约用水，反而还疯狂地浪费，真是太可耻了。
窗体底端
· 中国人均淡水资源占有量仅为世界平均水平的28％，看到这个数据后，有些人开始节水了，但有些人还是老样子，甚至更加浪费水。
· 我们江南水乡水源充足，但是现在西南西北地区经常闹干旱。土地干裂、庄稼枯死、骄阳似火，人们喝不上水，也洗不上早，这些新闻里的场景仿佛让我记忆犹新。到那时候，人们才知道水源的可贵，但是已经太晚了。我们家乡虽然还没到干旱期间，但如果在浪费水，我们也会那样，我们从今天，从现在做起节约水资源，还不算太晚。
· 那么，怎样节水，养成节水的好习惯呢？其实，节约水资源是从日常生活中一点一滴做起的。我们要及时把水龙头拧上，还可以要重复利用水资源。
大家知道吗？虽然地球是一个“水球”，表面72％的全是水，但可惜的是其中98％是咸水（海水），淡水只有2％，但淡水中有88％都被冰封在南北极，剩下的12％中，绝大多数都是地下水，不能开采也不能应用，能应用的只占淡水的0。04％。这是多么惊人的数目啊！看来，我们得马上行动起来，正当节水小卫士，不要让地球上最后一滴水成为我们的眼泪。
