Sixth grade math winter vacation homework

Prose is a genre of prose, and its content is often in life. The information conveyed to readers by the author through the idea of salvation has no limit in content and subject matter, and there is no limit in the truth or thought conveyed. Let's start with a model essay.

On Sunday, after finishing my homework, I have nothing to do, so I want to play with soap bubbles. I mixed the soapy water, soaked the plastic pipe in a small bottle filled with soapy water, and then blew it gently with my mouth. A string of bubbles flew out of the plastic pipe, colorful and beautiful. I blew harder and harder, blowing over and over again, and soap bubbles kept coming out, as if it had rained with soap bubbles. Suddenly found a problem: a string of soap bubbles always rises gently first, and then falls slowly. What's going on here? Has the quality of soap bubbles changed?

I put this question to my mother. Mom thought for a moment and said, "well ... I think it's the same principle as a hot air balloon." Is that really the case? I know that hot air balloons can fly into the sky because of the hot air generated by fuel combustion, but is there hot air in the soap bubbles?

In order to find out this problem, I rummaged through all the books at home and finally found the answer in a book "100,000 Why": when we blow soap bubbles, the soap bubbles are full of the gas we blow in. Unless it is very hot weather, the gas we exhale is always hotter than air. The quality of hot air is light, so the soap bubbles just blown out will rise upwards; However, with the passage of time, the temperature of the gas in the soap bubble drops, the volume of hot air shrinks, and the soap bubble gradually becomes heavier than air, so it has to fall slowly.

Haha, it turns out that my breath is the fuel of soap bubbles.

1. What is a scientific paper?

Scientific papers are also called knowledge papers or literary discourses. It adopts the style of prose, that is, with the help of some literary writing techniques, it vividly expresses the scientific content.

Scientific papers are written in literary style, which is scientific, informative, interesting and entertaining, and enables readers to gain scientific knowledge in literary appreciation.

Science and technology sketches are generally short and pithy, easy to understand, rich in language and lively in form. Reading such articles can activate thinking, enrich knowledge and broaden horizons, which is very popular with readers.

With the rapid development of high technology and the popularization of scientific knowledge, the social demand for scientific papers is increasing day by day, and the social benefits are becoming increasingly obvious. Scientific papers have become the content that people like to write and read. In recent years, the proportion of scientific papers in various examinations is getting higher and higher, and there are new attempts and innovations in content, form and proposition design. Therefore, in the study of expository writing, the value of scientific papers can not be ignored, and we should pay more attention to it.

2. The main characteristics of scientific papers

A. Scientific content

The scientificity of scientific sketch is very important, the content must be scientific, the quoted materials must be reliable and the data must be accurate. The purpose of writing scientific sketches is to popularize scientific knowledge to people. If the knowledge introduced is unscientific, it will not only fail to achieve the purpose of writing, but also have a very bad influence. For example, there is a scientific sketch "potted flowers should not stay indoors for the night" on the grounds that plants should inhale oxygen and exhale carbon dioxide at night, which is harmful to people's health. In fact, the carbon dioxide exhaled by every 300 square meters of leaves is equivalent to the amount exhaled by a person. It can be seen that putting a few potted flowers indoors for the night will not affect people's health.

B. the vividness of writing.

The vividness of writing is the main sign that scientific papers are different from general expository articles.

How to make the writing of scientific papers vivid?

One is good at narration and description. For example, it tells a fairy story about the Dead Sea, and there are many wonderful descriptions about the strange peaks and caves in Guilin.

The second is to be good at interspersed anecdotes. For example, inserting a fairy tale into the Dead Sea vividly describes the situation that people don't sink in the Dead Sea, and illustrates the scientific truth of the buoyancy of the Dead Sea water from the side. For example, in the article "The Language of Human Beings", two sentences were inserted into the composition of the master elder brother when he was in primary school, which made the writing relaxed and lively.

Third, be good at using rhetoric. Read the expositions in Unit 2 and Unit 7 carefully, consciously find out the rhetorical methods used in the text and taste its language characteristics. Because some scientific knowledge is not easy to understand, being good at using figurative rhetoric methods can make scientific principles easy to understand, easy to introduce and popularize scientific knowledge.

C. Content popularity

Scientific papers are not for professional scientific research, but for popularizing scientific knowledge, so scientific content must be explained, introduced and expressed in simple terms. For example, human language, tea, Shi Tian and other articles are characterized by easy-to-understand content.

3. The form of scientific sketch.

With the extensive content of scientific sketches, from basic particles and atoms invisible to the naked eye to the huge earth and sun; No matter in industry, agriculture, physics, chemistry, astronomy, geology, biology and so on. , you can find the theme of scientific sketches. Therefore, the representation of sketch must be diverse and flexible. But to sum up, the common ones are as follows:

A. descriptive type

Description means description; Narrator refers to narration. This kind of sketch is rich in imagination and beautiful in language, with vivid description and narrative; The style of literary prose aims at introducing scientific knowledge. For example, Guilin with strange peaks and caves is one of the most typical examples. This description is convenient to say that from ancient times to the present, the circumstantial evidence is extensive and interesting, attracting readers.

B. Self-description

Self-description is a scientific knowledge that is introduced in a personification way with the thoughts, feelings, language and actions given by the first person, which makes the explained things stand up and introduce themselves. For example, topics such as "dust self-reporting" and "I am electricity" are self-reporting.

C. Story style

Compile the scientific knowledge to be introduced into vivid and interesting stories, so that people can acquire scientific knowledge when reading or listening to stories. This form of expression is called storytelling. It is different from self-report and uses the third person; Similarly, anthropomorphic methods are mostly used. Using this form, we should not only make the story fascinating, but also pay attention to its rationality.

When you tell a story on the phone, you should explain the time and place. "People" is to personalize the things mentioned and have a plot. In terms of expression, narrative and description are generally equally important, and the language is vivid and vivid. Of course, we can't just emphasize stories and ignore scientific knowledge, and the meaning of writing will be lost.

D. Conversational style

Conversation, also called dialogue, is an explanation in the form of question and answer and dialogue. This way gives people a kind of cordial and real feeling, which is easy to communicate with readers and produces a * * * sound. At the same time, this writing is easier to refine.

Conversations are generally divided into three types: question and answer, dialogue between Party A and Party B, and dialogue in the text. The first two are more common and easy to master. The second is to organize the dialogue between characters into concrete stories. The development of storyline is mainly driven by the change of dialogue content, and dialogue is the main body of the article.

In short, no matter which form is adopted, it depends on the content, highlighting description as the main line and integrating narrative, description, lyricism and even discussion. It looks like prose, but it is actually an explanation. The infection of literary brushwork achieves the purpose of explanation and is more readable.

Several texts selected in Unit 2 and Unit 7 of Book 4 are very literary, but their forms are relatively simple. The Dead Sea is not dead, the rest are descriptive. There is no dialogue, self-report and other forms. It is also necessary to accumulate articles in future reading and enrich the reading content.

4. Example analysis

[example]

I am electricity.

I am electricity, I am electricity, haha! I am singing a cheerful song!

Hey! Children, I have many skills. Everyone will be bored without me! Maybe you think I'm bragging! I, I'm not bragging, and I'm not selling melons-bragging is true. Listen to me if you don't believe me: you live in an era when I am indispensable. A city, without me, cough! That's unthinkable. The city will be paralyzed, the factory will have to stop working, the lights will not turn on, the tram will not move, the radio will be silent, the TV will have no image, and even your precious electric toys will not move! ..... everything seems indispensable to me. Don't you think? You see, in today's efforts to realize the "four modernizations", workers work with machines, farmers use water pumps and pumps for irrigation, submarines can be operated by radar, and the great power of airplanes and cannons is remotely controlled by computers ... Here, the technological revolution has shown its magic; For me, automation is great. Do you know what Grandpa Gao Shiqi praised me for? He praised me for "serving the people tirelessly", which made me very happy.

Perhaps, you will feel strange, where did I get this great ability? Did God create me, or did he jump out of a crack in the stone? Don't! Neither. A long time ago, a man named Franklin found me. Later, many diligent people used scientific methods to transform the energy of Grandpa Huo, Grandma Shui and Grandma Sun into me. This is what people usually call thermal power generation, hydropower generation and solar power generation. At present, Gezhouba Hydropower Station has the strongest power generation capacity in China. It is said that its power generation capacity can reach 2.7 million kilowatts. In addition, large hydropower stations such as the Three Gorges and Longyangxia are being actively built ... In short, intelligent human beings can use many ways and means to create me and let me serve mankind.

Oh! To think of it, I have to introduce two families of electricity: positive charge family and negative charge family. When you rub a glass rod with silk, the charge is positive, so many positive charge groups are positive charge families. When rubbing a rubber rod with fur, the charge it carries is negative charge, and a group of many negative charges is of course a negative charge family. I have to remind you that we have a particularly strange temper: within the same family, we are intrigued and mutually exclusive, while two different families can live in harmony and attract each other. This is what people usually call "like-sex repulsion, like-sex attraction".

I usually walk with my foot on the copper wire. I can walk fast! At the fastest time, it can fly 300,000 kilometers in 1 second. Only uncle guang can compete with me in speed.

However, sometimes I am also very upset. If people accidentally touch me, they will be numb. Actually, it's not all my fault. It was people who used me carelessly and touched me. But people who don't know my temperament always say, "He was electrocuted!" " ""this damn electricity is really harmful! "alas!" Strange "call me a person to carry. What bad luck Those careless people don't review themselves first. Hey! I can say hello in advance: when you use me, the line must not be connected wrong; Don't break the rubber sweater I am wearing; My household appliances also have a "tail cover", which is the ground wire, which is much safer to use underground! What if I run into you while using me? First, cut off the power. Second, give artificial help to the person who met me and bring him back to life.

Children, then again, my work is always greater than that! Especially when the line is out of order, when people light candles, they always say angrily, "Why isn't the electricity on now!" "But when I meet someone again, I will always hear the ecstatic voices of thousands of families in Qian Qian:" Electricity is coming, electricity is coming ... "Then the lights are on, the cough is ringing, the TV is singing ... not to mention the joy in my heart, and I can't help singing that happy song again.