Write a popular science explanatory essay

1. Write a common sense expository essay

Write a common sense expository essay 1. Common sense expository essay

It is an expository essay whose main purpose is to introduce the object clearly. .

There are many ways to use expository texts to introduce common sense. Commonly used ones are:

(1) Define. Using concise language to point out the essential characteristics of the object being explained and distinguishing it from objects that are easily confused with it is called definition. For example, "the overall planning method is a mathematical method for arranging the work process."

(2) Classification. Dividing the objects to be explained into different categories according to certain standards and explaining them one by one is called classification. For example, "Where Food Comes from" divides the ways and methods for organisms to obtain food into two categories: "autotrophic" and "heterotrophic", and then explains them respectively.

(3) Give examples. Giving examples to illustrate and make the content concrete is called giving examples. "Chinese Stone Arch Bridge" introduces Zhaozhou Bridge and Lugou Bridge to help people understand the characteristics of Chinese stone arch bridges in detail, using examples to illustrate.

(4) Column numbers. Using accurate data to illustrate certain aspects of things is called numbering. For example, "The total length of the pen is 13.5 cm, the pen body accounts for about 3/5, and the pen cap accounts for about 2/5. The small movable hinge at the top can be freely extended and retracted, like a raven, 0.7 cm long, and the pen hanging length is 3.9 Centimeter." ("My Ballpoint Pen")

(5) For comparison. It is to explain things and affairs through comparison. For example, in "Suzhou Gardens", the asymmetry of Suzhou garden architecture is compared with the symmetry of ancient Chinese palaces and modern general housing to highlight the natural beauty of Suzhou gardens.

(6) Use an analogy. An explanation method that uses the similarities between two things to highlight the characteristics and characteristics of the things and enhance the image and vividness of the explanation is called metaphor. "The bridge opening of the stone arch bridge is arc-shaped, like a rainbow." The image accurately explains the appearance characteristics of the stone arch bridge. This sentence uses an analogy to explain.

(7) Draw charts. Sometimes, it is difficult to be clear and specific with text explanations alone. In this case, you can supplement it by drawing a list of pictures. This method is called drawing a chart. The article "Overall Planning Method" uses this method of explanation.

(8) Quote information. The range of materials is very wide, including classic works, famous quotes, formulas and laws, allusions and proverbs, etc.

2. Fifth grade Chinese Lesson 9 This article is a common sense expository essay. The explanation methods of expository essays are: Column

The explanatory object of this article is spider silk. Linguistically speaking, this article belongs to things. Expository text.

The object of this type of expository description is a specific thing, and the purpose of the explanation is to enable readers to understand and recognize the characteristics of the thing. Reference: The object explained in this article is ( ).

Linguistically speaking, this article belongs to the ( ) type of expository text. Introducing a new exploration of the mystery of spider webs. Why use orb spiders as an example? Tell us your understanding.

What two types of spider silk are spider webs made of? What are the functions of these two types of spider silk? What do scientists mean by their new discovery of the mysteries of spider webs? Summarize the answer in your own words Spider Silk Thing Explanation Essay Because ball beads are common dry silk and wet silk dry silk and wet silk. The outer traction lines and radial radius lines of the net are dry silk. They are basically non-sticky and just form a large frame to fix and support the hunting net.

The traction line is very thick and can be called the main lead. The spirals on this skeleton are wet silk. They are not only very sticky, but also extremely elastic. This is a real hunting net.

The small area in the center of the web is non-sticky and is where the spider rests. Dry yarn is not very elastic and will break when its length increases by about 20% after being stretched.

Wet silk is completely different. Even if the length is tripled, it can still bounce back and return to its original shape. Therefore, it is difficult for mosquitoes and flies caught in the net to escape through the net (ask the principal) 4. Spider webs can contribute to bionics.

3. Write an essay on the topic of "common sense"

Common sense

Man follows the earth, the earth follows the sky, heaven follows the Tao, and the Tao follows nature. ——Lao Tzu

As early as more than 2,000 years ago, Lao Tzu revealed to us what common sense is. In fact, nature is a kind of common sense. It does not require too much exploration. It exists objectively. It has always been Just ignored by us. Common sense has its relativity. Of course, what we have to do is to apply common sense to our lives.

For a farmer, plowing, transplanting, irrigating, and harvesting in agriculture are common sense; for a college student, addition, subtraction, multiplication, and division in operations are common sense; For a stock investor, buying a position, covering a position, bear market, and small cap in the stock market are common sense; for a chef, frying, boiling, stir-frying, and deep-frying in cooking are common sense; however, for a baby to say , the so-called eating, drinking, defecation, and sleeping is a kind of common sense... But as long as the object changes, common sense becomes advanced applied knowledge. You can't ask a farmer uncle to do advanced physics problems with a pen. It is very irrational for a baby to go to work in farming and so on, because common sense is relative. Common sense is like "being and non-being create each other, difficulty and difficulty complement each other, long and short complement each other, high and low are in harmony with each other, sounds and voices harmonize each other, and front and rear follow each other." Similarly, everyone has his or her own scope of common sense, and we need to expand our scope of common sense. "Knowing or not knowing is the best; not knowing is the disease." None of us are saints. There is too much common sense about everything in the world, and we cannot understand it all. Knowing means knowing, and not knowing means not knowing, so we should continue to study hard.

Of course, no matter how much knowledge a person knows, it is useless just to learn it. You must know how to apply it! "Tao is big, sky is big, earth is big, and people are big. There are four big things in the domain, and humans live in one of them." Human beings are a part of nature and should contribute their own abilities to transform nature so that nature and human beings can life is more harmonious and beautiful. All water conservancy experts know that blocking, dredging, draining, and storing are common sense in controlling floods. However, China still has the danger of floods. As early as the end of the Warring States Period, Li Bing of the Qin State designed a "deep beach, low-level weirs, and floods." The Dujiangyan Irrigation System, which cut off corners of the bay and pumped out the heart at the right time, completely solved the local water hazards and turned them into benefits. Sichuan became the "Land of Abundance". Gun, the father of Yu the Great, also failed in water control. Traditional Chinese medicine doctors all know that looking, smelling, asking, and feeling are common sense. According to legend, Hua Tuo’s master was ill and none of his brothers could diagnose and treat him. In the end, Hua Tuo also looked, smelled, asked, and felt, so he concluded that the master was pretending to be ill. In the end, his master also Admittedly, the same medical skills taught by the same master, the same diagnosis and treatment methods, Hua Tuo diagnosed and treated correctly, but the other brothers failed. For military strategists, all kinds of troop movements, formations, offenses and defenses, and strategies are all common sense. During the Warring States Period, during the great battle between Zhao and Qin, Lian Po used deep ditches and high fortresses for defense. However, after Zhao Kuo was replaced, Zhao Kuo's paper tactics Of course, the ability was a huge defeat, and 400,000 Zhao troops were sacrificed in vain, which was the famous Changping Battle... Various signs can show that even if you learn countless common sense, it will be in vain if you don't use it, so we must use common sense Apply it to our lives to make nature and human life more harmonious and beautiful.

In the scope of my common sense, common sense is just like this. It has its relativity, but the more important thing is to use common sense to actively change lives!

Only this one was found for now.

If you are from Chaoyang Experiment...don't copy it. (If they are similar, it will trouble you and I will have a hard time haha)

4. Common sense explanatory text (500 words) Urgent

Common sense about fire extinguishing 1. Solid fires should be extinguished with water first, Foam, ammonium phosphate dry powder, and haloalkane type fire extinguishers are used to put out the fire.

2. Liquid fires should be put out first with dry powder, foam, haloalkane, and carbon dioxide fire extinguishers. 3. Gas fires should be put out first with dry powder, haloalkane, and carbon dioxide fire extinguishers.

4. Fires involving charged objects should be put out first with haloalkane, carbon dioxide, or dry powder fire extinguishers. 5. Fire extinguishing equipment for extinguishing metal fires should be negotiated between the design department and the local public security fire supervision department. Currently, there are no regular fire extinguisher products in our country.

6. Please refer to "How to use fire extinguishers" for how to use fire extinguishers and how to put out fires. How to use fire extinguishers Classification of fire extinguishers There are many types of fire extinguishers, which can be divided into: portable type and cart type according to the way they move; according to the power source for driving the fire extinguishing agent, they can be divided into: gas storage bottle type, pressure storage type, chemical reaction type, According to the filled fire extinguishing agent, it can be divided into: foam, dry powder, haloalkane, carbon dioxide, acid and alkali, water, etc.

Fire extinguishers are suitable for fires and how to use them (portable) 1. Foam fire extinguishers are suitable for fires and how to use them. The scope of application is suitable for extinguishing general Class B fires, such as oil products, grease and other fires. It can also be applied to Class A fires. Fires, but cannot extinguish fires caused by water-soluble flammable and flammable liquids in Class B fires, such as fires involving alcohols, esters, ethers, ketones and other substances; nor can they extinguish live equipment and Class C and Class D fires. Instructions for use: You can carry the lifting ring on the upper part of the cylinder and rush to the fire scene quickly.

At this time, care should be taken not to tilt the fire extinguisher excessively, nor to hold it horizontally or upside down, to prevent the two agents from mixing and spraying out in advance. When you are about 10 meters away from the ignition point, you can turn the cylinder upside down, hold the lifting ring tightly with one hand, hold the bottom ring of the cylinder with the other hand, and aim the jet at the burning object.

When fighting a flammable liquid fire, if it is burning in a flowing manner, spray the foam from far to near so that the foam completely covers the burning liquid surface; if it burns in a container, the foam should be sprayed out. To the inner wall of the container, make the foam flow along the inner wall, gradually covering the fire liquid surface. Do not spray directly at the liquid surface to avoid the impact of the jet from scattering or flushing the burning liquid out of the container and expanding the combustion range.

When fighting a solid material fire, the jet should be aimed at the most violent burning point. When extinguishing a fire, as the effective spray distance shortens, the user should gradually approach the burning area and always spray foam on the burning object until it is extinguished.

When in use, the fire extinguisher should always be kept upside down, otherwise the spray will be interrupted. (Portable) foam fire extinguishers should be stored in a dry, cool, ventilated and easily accessible place. They should not be near high temperatures or places that may be exposed to the sun to prevent carbonic acid from decomposing and becoming ineffective; antifreeze measures should be taken in winter to prevent freezing; and should Wipe off dust and unclog the nozzle frequently to keep it clear.

2. Cart-type foam fire extinguishers are suitable for fires and are used in the same way as portable chemical foam fire extinguishers. How to use: When used, it is usually operated by two people. First, quickly push and pull the fire extinguisher to the fire scene, and stop it about 10 meters away from the fire point. After one person releases the spray hose, he holds the spray gun tightly with both hands and aims it at the burning point; the other First, turn the handwheel counterclockwise to raise the screw to the highest position to fully open the bottle cap, then tilt the cylinder backward to make the pull rod touch the ground, and rotate the valve handle 90 degrees to spray foam to extinguish the fire.

If the valve is installed at the spray gun, the person responsible for operating the spray gun should open the valve. The fire extinguishing methods and precautions are basically the same as those of portable chemical foam fire extinguishers, so you can refer to them.

Because this type of fire extinguisher has a long spray distance and a long continuous spray time, its advantages can be fully utilized to extinguish initial fires in large-area storage tanks or oil tankers. 3. Air foam fire extinguishers are suitable for fires and how to use them. Scope of application: The scope of application is basically the same as that of chemical foam fire extinguishers.

However, anti-soluble foam fire extinguishers can also extinguish the first fires caused by the burning of water-soluble flammable and combustible liquids such as alcohol, ether, ketone and other solvents. Instructions for use: When using, you can carry it by hand or shoulder and quickly run to the fire scene. When you are about 6 meters away from the burning object, pull out the safety pin, hold the opening pressure handle with one hand, and hold the spray gun tightly with the other hand; squeeze the opening pressure handle firmly to open the seal. Or pierce the sealing piece of the gas storage bottle, and the air foam can be sprayed out from the spray gun mouth.

The fire extinguishing method is the same as that of a portable chemical foam fire extinguisher. However, when using an air foam fire extinguisher, the fire extinguisher should always be kept upright. Do not use it upside down or lying down, otherwise the spray will be interrupted.

At the same time, you should always hold the opening pressure handle tightly and do not let go, otherwise the spray will be interrupted. 4. Acid-base fire extinguishers are suitable for fires and how to use them. Scope of application: Suitable for extinguishing initial fires burning Class A substances, such as fires burning wood, fabric, paper, etc.

It cannot be used to extinguish fires burning Class B substances, nor can it be used to extinguish Class C flammable gas or Class D light metal fires. At the same time, it cannot be used to fight fires involving electrically charged objects.

How to use: When using, you should carry the lifting ring on the upper part of the cylinder and quickly run to the fire location. Never carry the fire extinguisher on your back or tilt it too much to prevent the two liquids from mixing and spraying in advance.

When you are about 6 meters away from the burning object, you can turn the fire extinguisher upside down and shake it several times to speed up the mixing of the two liquids; hold the lifting ring with one hand and the barrel with the other hand. The bottom ring under the body aims the ejected jet at the most violent burning point. At the same time, as the injection distance decreases, the user should push closer to the burning place.

5. How to use a carbon dioxide fire extinguisher: When extinguishing a fire, just lift or carry the fire extinguisher to the fire scene. When you are about 5 meters away from the burning object, put down the fire extinguisher and pull out the safety pin. Hold the handle at the root of the horn with one hand. Hold the pressure handle of the opening and closing valve tightly with the other hand. For carbon dioxide fire extinguishers without spray hoses, the horn should be raised 70-90 degrees.

When using, do not directly grasp the outer wall of the speaker or the metal connecting tube with your hands to prevent frostbite on your hands. When extinguishing a fire, when the flammable liquid burns in a flowing form, the user sprays the jet of carbon dioxide fire extinguishing agent toward the flame from near to far.

If flammable liquid is burning in the container, the user should lift the horn. Spray into the burning container from the upper side of the container.

However, the carbon dioxide jet cannot directly impact the flammable liquid surface to prevent the flammable liquid from rushing out of the container and expanding the fire, making it difficult to extinguish the fire. Trolley-type carbon dioxide fire extinguishers are generally operated by two people. When in use, two people push or pull the fire extinguisher to the burning place, about 10 meters away from the burning object.

5. Common sense expository essay, urgent

The so-called expository essay is an article that uses explanation as the main expression to explain things, clarify things and give people knowledge. Explanation, or interpretation of abstract arrangements, enables people to understand the shape, structure, nature, type, cause, function, relationship of things, or the concept, characteristics, origin, evolution, similarities, etc. of things, thereby gaining relevant knowledge. Knowledge. The emphasis on explanation is a sign of the difference between expository writing and other literary styles in terms of expression.

Among various article styles, descriptive style is a relatively independent category. In people's social life, expository writing has increasingly demonstrated its important role and practical value. Real life fully shows that expository writing is not an insignificant article form, but a commonly used style with an extremely wide range of applications. It is closely related to people's production, work and life, and due to the needs of social life, expository writing is emerging in large numbers .

Regarding the classification of expository texts, people now classify expository texts differently from different perspectives and according to their own standards. According to the expression techniques of expository writing, we generally divide it into three categories: 1. Explanatory writing; 2. Narrative writing; 3. Literary writing.

An expository essay that explains things and explains things from several different aspects is called an expository essay. Informative texts or teaching materials on history, geography, physics, chemistry, animals, plants, science and health, language, literature and art, scientific experiment reports, instructions for using utensils, etc. all fall into this category.

An expository essay that introduces things through a brief overview or plot is called a narrative expository essay. Plot synopses of movies, TV series and operas, synopses of novels and other literary works, comic strips or commentary on certain photographs, etc. all belong to this category.

Expository essays that use visual techniques to introduce things and explain things are called literary expository essays. This type of expository essay has more literary color. Knowledge sketches (or science sketches), descriptions of scenic spots and historical sites, cultural relics, etc. all belong to this category.

Generally speaking, the first two types of writing are relatively plain, focusing on the detailed and analytical explanation of things or events. The latter type of writing is lively and interesting, and often adopts a literary style.

6. How to write a common sense explanatory essay on "Squirrel"

There are many types of squirrels. There are about 240 species in the world and 26 species in my country.

Among them, the squirrels living in the woods are very common in Northeast my country and North China, so they are also called common squirrels. Its body is slender and its body hair is gray, dark brown or auburn, so it is also called gray squirrel.

When people go up the mountain, they can often see squirrels scurrying back and forth on the pine trees, with a long and fluffy tail often turned back towards the back. Sometimes, he holds a pine cone in his two front feet and gnaws it with his sharp front teeth, like a pilgrim in a temple worshiping Buddha.

Squirrels build nests on dense branches, or use the abandoned nests of crows and magpies, or sometimes in tree holes; in addition to eating wild fruits, they also eat twigs, buds, and leaves. , as well as insects and bird eggs. As soon as autumn arrives, squirrels begin to store food. A squirrel often stores several kilograms of food in several places. Sometimes you can see squirrels drying food on trees to prevent it from going bad and moldy.

In this way, the squirrels will not have to worry about having nothing to eat in the cold winter. Squirrels are generally active during the day and are more active in the early morning.

It has good hearing and vision, and is agile and lively. The fur of squirrels is light and warm. Although the quality is not as good as that of otters and sables, it is abundant in quantity and is one of the important fur animals in our country.

Squirrels have particularly long ears and tail hairs that are adapted to life in trees; they use long hook-like claws and tails to hang upside down from branches. At dawn and dusk, they will also leave the trees and hunt on the ground.

After squirrels find abundant food in autumn, they will use tree holes or dig holes in the ground to store fruits and other food, and block the hole entrances with soil or fallen leaves. Squirrels have red fur all over their bodies in summer, and in autumn they change to black and gray winter fur that covers their bodies tightly.

Newborn squirrels are hairless and have unclear eyes. They begin to grow hair only 8 days after birth. They open their eyes after 30 days. They can eat stiff fruits at 45 days and their movements become very fast. agile. Squirrels are very docile little guys to their owners. We should also treat them gently, so that they will be devoted to you and will never hurt you with their teeth.

Of course, they will gently nibble your fingers with their teeth and play with you. They will feel itchy, which is a sign of their friendliness towards you. Squirrels build nests on dense branches, or use the abandoned nests of crows and magpies, or sometimes in tree holes; in addition to eating wild fruits, they also eat twigs, buds, leaves, as well as insects and bird eggs.

As soon as autumn arrives, squirrels begin to store food. A squirrel often stores several kilograms of food in several places. Sometimes you can see squirrels drying food on trees to prevent it from going bad and moldy. In this way, in the cold winter, the squirrels will not have to worry about having nothing to eat.

Squirrels have a strong ability to give birth to children. Like other rodents, they mature early and reproduce quickly. Every year in January and February, male and female squirrels begin to fall in love. The male squirrel swings his thick tail and jumps on the tree canopy to chase the female squirrel. At this time, the female squirrel is also excited and enthusiastically following her.

*** The period lasts for about two weeks, during which the male and female are almost inseparable. Female rats give birth to pups on 35-40 days of gestation, usually two, and occasionally three, per year.

Female rats that give birth in the first year will give birth to 3 to 6 pups per litter, and after the second year, they can give birth to 5 to 10 pups per litter. Newborn cubs are smooth and hairless, with red bodies and closed eyes. They weigh 7 to 8.5 grams, have a body length of 5.6 cm, and a tail length of 2.4 cm.

Young mice begin to mature sexually when they are 8-9 months old, that is, they can mate and breed in the second year. Squirrels like to eat vegetarian food and occasionally eat meat.

Its vegetarian diet mainly consists of the dried fruits and seeds of Korean pine, spruce, fir, larch, Scotch pine, hazelnuts and acorns; its meat-based diet mainly consists of insects, larvae, ant eggs and other Mainly small animals, etc. When food is scarce, squirrels have other options.

In the spring, we eat tree buds, in the summer we eat mushrooms, berries, bilberries and other berries. In the autumn, food is abundant and we don’t have to worry about eating and drinking. We can eat whatever we want, but the most delicious ones are red pine nuts. . When it comes to picking pine seeds, this is a specialty of squirrels. No matter how tall the tree is or where the cones grow, squirrels can get them in their mouths.

The specific process is: it first bites off the mature cones and drops them to the ground, then comes down from the tree, like a primate, uses its front feet to peel off the cone scales, bites the seed coat, and takes out the seeds. , feed on pine nuts. Interestingly, squirrels do not easily put down their food when frightened, but run away with the cones in their mouths. Squirrels have an extremely well-developed sense of smell, and they can accurately identify whether pine nuts are empty or solid. All the seeds abandoned by squirrels on the top of pine cones have no kernels. Although the shell of these seeds has not been bitten, the squirrel still smells them. Then you will know.

Squirrels also have the instinct to store food. When the red pine seeds mature in autumn, the squirrels will run around holding the pine seeds in their mouths and transport them to a safe place to hide them. A few or more than a dozen of them will be buried in the ground. , reserved as overwintering food. Although the ground is covered with snow in winter, squirrels can still find hidden food without any difficulty, and some may miss it.

But it is precisely because they are buried underground that they cannot be found, which helps the spread and spread of Korean pine seeds and promotes natural regeneration. Squirrels are widely distributed and can be found almost throughout the forest.

Its population size depends to a large extent on the abundance of food. If food is abundant for several consecutive years, the population will increase significantly. Especially in the years when pine seeds are harvested, squirrels living in other places will migrate here in groups and breed on the spot the next year, so the population will increase sharply; if this area When the pine seed harvest fails, the squirrels will move their families to find another habitat, causing a sharp decline in the population in the area.

The behavior of squirrels in determining the number of populations as food becomes abundant and scarce is really superior. It not only helps the population reproduce but also helps the population spread widely. The living habits of squirrels are different from other animals. They like to move around in broad daylight, especially in the early morning. They often jump back and forth between tree trunks and tree branches, sometimes looking for food, sometimes playing, and they are carefree and uncomfortable.

Squirrels do not have the habit of hibernating, but in the mid-winter season, they are afraid of the cold and are not very active. Especially in severe winter weather, the time for the smokers to leave the nest is shorter. They usually come out for 1 to 2 hours around 9 a.m. and then come out for 1 hour to 2 hours at around 1 p.m., and stay in the den for the rest of the time.

A squirrel has a habit that no matter how cold the weather is, it does not eat in its nest. Instead, it sits on a branch, facing the sun, holding the food with its forelimbs and bringing it into its mouth, chewing and tasting it with relish, and sometimes erecting its ears. Listening attentively, sometimes turning his eyes to look around, his behavior is funny and makes people laugh.

7. Write an explanatory essay

My dear, he is the greatest and most noble person in the world.

Since I was born, I have been bathed in the sunshine of maternal love. In order to raise me well, she did everything a mother could do.

What impressed me the most and made me even more grateful was my mother’s kind and sincere smile. When I made progress, she smiled and praised me; when I made mistakes, she criticized me with a smile; when I was proud and complacent, she smiled and poured some cold water on me; when I was decadent and frustrated, she smiled and gave me some motivation... …I am a small tree that thrives under the dew of my mother’s smile. I am a small flower that blooms under the spring breeze of my mother’s smile.

I am growing up day by day, but I don’t know why. My mother’s kind smile is no longer common, and is often replaced by a stern face. The only things that accompany me every day are my desk, lamp and countless exercises.

"Doesn't my mother love me anymore?" I came up with this idea again and again, and denied it again and again. I think of my mother teaching me to write and recite poems when I was a child. She washed my clothes in the cold winter and tidied my room in the hot summer... One day when I was nine years old, at one o'clock in the middle of the night, there was pouring rain, lightning and thunder outside.

I suddenly developed a high fever, and my father was not at home. My mother looked at me, then looked out the window, carefully put a raincoat on me, and resolutely carried me on her back and ran to the hospital. I lay on my mother's back and clearly heard her rapid breathing.

My heart was about to break. I said, "Mom, let me come down and walk by myself!" My mother replied resolutely, "How can that be done? You have a high fever, how can you walk in the rain?" Wear your raincoat tightly, don't get wet." My eyes couldn't help but moisten.

It was raining and the road was slippery. My mother tilted and almost fell. After she stood firm, she asked me eagerly: "Are you okay?" I said, "It's okay!" My mother breathed a sigh of relief and said with relief. "That's good, that's good." Just like that, my mother carried me to the hospital with a deep kick and a shallow kick.

8. Looking for common sense explanatory text to introduce items and literary explanatory text to introduce items.

Today I will introduce to you the pencil box.

Its outer surface is crystal powder plus crystal purple. There is a picture on the box.

In the painting, there is a child playing games in the garden. There are several big green trees and a naughty kitten next to them. This pencil case has three layers.

You can put a lot of pencils. When you open the pencil case, you can see that it is a foldable three-layer pencil case.

When closed, it will automatically fold, and when opened, it will automatically reveal three levels, like a three-story building.

There is a blue shelf on the top floor where you can put books. You can put books on it and read them without them falling down. This layer is generally relatively small, and it is best to put things like rubber on it.

This layer makes it easier for us to read and study. Let me introduce the middle layer again! The middle layer is very ordinary and is best for items such as pencils, pens, and ballpoint pens. When I want to use the pen, I only need to tilt the pencil case slightly, and I can easily take out the stationery I need.

The bottom floor is relatively wide and can be used to store items such as rulers and computers. You see, my pencil case is practical. In fact, its price is also very cheap. If you want to buy it, look no further. I recommend it to you! Comment from a famous teacher: Your explanatory text is very clear, and you introduce the pencil box from the outside to the inside.

The article focuses on describing the structure of the pencil box. This pencil box has three layers. You can describe these three layers clearly in clear language without a trace of confusion. This is Very rare. What's more worth mentioning is that you also introduced the functions when describing it.

Very smooth and natural. "If you want to buy it, don't look away, I will recommend it to you!" I forgot the wrong word.

(Xuele China Distinguished Teacher: Teacher Luo Danna) 2008-11-25 20:46:00.

9. Learn common sense expository text about bees

Bees

Bees are a small insect that everyone is familiar with. During the season when flowers are in bloom, traces of it can be seen everywhere. When it comes to bees, there is really a lot of knowledge!

Bees are a group that works together. Usually we only see bees searching among flowers alone, but in fact this is just a superficial phenomenon. When you look closely, it is not difficult to find that bees are insects that live in groups. A bee colony usually consists of a queen bee and one to two hundred worker bees. They usually seem to be very few, but if they gather together they can be overwhelming! It is said that the division of labor is harmonious because the queen bee (mother bee) is only responsible for laying eggs.

According to statistics, it can lay 15,000 to 20,000 eggs in a day and night. Now we can understand the reason why the bee swarm is so big. With this "superrebirth champion", can we still worry about the lack of bees? The rest are worker bees, who are responsible for collecting pollen and nectar, brewing honey, nurturing bees, and feeding bee workers. They are also responsible for building hives, guarding the hive, and regulating the temperature and humidity in the hive. Alas, what a lot of labor! I'm really worried about the little worker bees. ?

Bees are hardworking little insects. Let’s just say worker bees collect nectar. When flowers bloom every year, worker bees are busy going out early and returning late. Sometimes they even take advantage of the moonlight to make honey from the flowers. To make one kilogram of honey, bees must collect raw materials from 1 million flowers. If the average distance from the flower bush where bees collect nectar to the hive is one and a half kilometers, then the bees have to fly 450,000 kilometers to collect one kilogram of honey, which is almost equivalent to flying around the earth's equator 11 times. ah!

What an astonishing number, what a hard work. But when we taste the sweetness of honey, how many of us would think that it is the result of the huge labor of little bees?

Having said this, another question comes to mind. How do bees know what plants bloom where? Don't worry. According to reliable information, they "revealed" that they first sent many bees out of the nest to conduct reconnaissance, and then came back to tell their companions the results of the reconnaissance. In this way, they can always know where the nectar is hidden in the boundless nature. At this time, we have to admire their "intelligence".

Bees are "selfless" little insects. Bees only need a little bit of honey each time, but they give up a large part of the delicious honey to humans.

One final point. Bees don't sting easily, and they won't fight back until you hurt them. However, it lost its life for this sting. Therefore, everyone must not harm bees. For no other reason than for their hard work and selfless dedication, we should care more about them and love them more.

This article is a popular science expository article. It introduces readers to a small animal, the bee. The article uses illustrative methods such as listing numbers and making comparisons. The explanation is accurate, and the language is vivid, smooth and interesting. It can be regarded as an excellent expository article for junior high school students. .