What is the expository text of the cicada, and what is the introduction of the cicada?

On a hot summer day, you'll hear the sound of "know what you know" in the lush foliage, which is the sound of cicadas.

The cicada is one of the families of the suborder Hemiptera Cervicular Beak of the insect class, commonly known as known or borrowed. Survive by eating the sap of plants.

The cicada is 2 5 cm long, with two pairs of membranous wings, basically the same shape, with prominent compound eyes, three single eyes, and well-developed digging feet. The larvae live in the soil, and the last instar larvae are mostly brown and similar to the adults.

Cicadas use stinging mouthparts to suck the sap of plant roots, weaken the tree, make the treetops die, affect the growth of trees, usually stay in the soil for several years or even more than ten years, such as three years, five years, and 17 years, these numbers have one thing in common, they are all prime numbers. At the end of June, the larvae begin to emerge into adults, the newly emerged cicadas are green, and the longest lifespan is about 60-70 days, in late July, the female adults begin to lay eggs, and in early and mid-August, the eggs are mostly laid on the treetops with a thickness of 4-5 mm.

In general, cicadas can be divided into two main categories, one is the male cicada, which chirps; the other type is the female cicada, which cannot chirp; The male cicada's articulator is at the base of the abdomen, like a large drum covered with a layer of tympanic membrane, the eardrum is vibrated and makes sound, because the vocal muscle expands and contracts about 10,000 times per second, the cover plate and the tympanic membrane are empty, and can play a resonant role, so its song is particularly loud.

There are more than 2,000 species of cicadas, including fried cicadas, autumn cicadas, cockroaches and so on.

The cicada body is rich in nutrients, with a dry protein content of more than 70%, a fat of about 7%, vitamins and various beneficial trace elements that are about higher than that of general meat foods, and can be called the "protein king" in today's food.

Since the life of the cicada is very short, only about two months, it and its cicada molt can be used as medicine to cure diseases and save people. Adults live in the summer and chirp "Zhizhi" from the trees, so sometimes they are sympathetic to the ancients. Luo Bing Wang sang its poem in "The Cicada in Prison and the Preface":

The cicadas of the West Continent sing, and the southern crown is thoughtful.

The cicada is an insect. Cicadas live in temperate to tropical regions of the world and more than 2,000 species of cicadas have been recorded. Some species found in desert areas will excrete excess water from the backplate tergum when the body temperature is overheated, which in turn will achieve the effect of cooling and heat dissipation.

The reason why we have the illusion that cicadas have a short life is because of their unique life cycle. The life of a cicada goes through three stages: fertilized egg, larvae, and adult. In the summer, fertilized eggs laid in the early years hatch into larvae, which burrow into the soil and feed on the sap of plant rhizomes.

Types of cicadas

Cicada species include grasshoppers, cockroaches, grass cicadas, spotted cicadas, thin-winged cicadas, etc. Grasshopper, also known as chirping lizard, horse lizard, chirping cicada, autumn cicada, spider, grasshopper, etc., the male body is long and wide, centimeter long, wingspan centimeter, female slightly shorter, black, shiny.

Cockroach cricket, a relatively small cicada, body length of about centimeters, black stripes, hind wings except for the edge of the black hair, widely distributed, May to June song, from morning to night, grass cicada, common species at low altitude and flat grass, adults appear in spring and summer, often in grass and other green leaf activities, body length 13-15 mm, the front edge of the head is slightly triangular, body color changeable.

1. This small round hole is about an inch in diameter, and there is no soil around it. Most burrowing insects, such as golden dung trees, always have a mound of dirt outside the cave.

2. This difference is due to the difference in their working methods. The work of the golden dung starts at the entrance of the hole, so the excavated waste is piled up on the ground. The cicada larvae come from the ground, and the final work is to open the gate.

Since the door has not yet opened, it is impossible to pile up dirt at the door.

3. Common cicadas like to lay eggs on dry twigs. It chooses the smallest branches, as thick as dead grass or pencil, and tends to be upturned, almost dead branches.

4. Gnats, like cicadas, also have puncture tools, which are located near the middle of the lower part of the body, and stick out at right angles to the body. Jujube touch.

5. This weak animal is in desperate need of concealment, so it must immediately go underground to find a place to hide. When it's cold, there's a danger of death if you're slow. It had to look for soft soil everywhere. There is no doubt that many of them died before they were found.

Summary. The essay "Cicada" uses three explanatory techniques: listing numbers, making comparisons, and facsimile appearances.

1. Column figures: accurate, rigorous and specific.

In order to make the thing to be illustrated concrete, you can also use the method of column numbers so that the reader can understand. It should be noted that the figures cited a lot must be accurate, and inaccurate figures must not be used, even the estimated figures must have a reliable basis and strive to approximate them.

2. Glossary appearance: more vivid and concrete.

In order to make the object to be described more vivid and concrete, the appearance can be copied.

3. Comparison: distinct, prominent, and concrete.

Comparison is an explanatory method that compares two things or phenomena of the same or different categories to illustrate the characteristics of things. Explain some abstract or relatively unfamiliar things, and compare them with concrete or familiar things, so that readers can get a concrete and distinct impression through comparison. The characteristics of things also tend to be revealed in comparisons.

When making comparisons, it can be similar or different, and things can be "sideways" or "vertical".

What are the methods of explanation used in this article.

The essay "Cicada" uses three explanatory techniques: listing numbers, making comparisons, and facsimile appearances. 1. Column figures: accurate, rigorous and specific.

In order to make the thing to be illustrated concrete, you can also use the method of column numbers so that the reader can understand. It should be noted that the figures cited a lot must be accurate, and inaccurate figures must not be used, even the estimated figures must have a reliable basis and strive to approximate them. 2. Gac-likeness:

More vivid and concrete. In order to make the object to be described more vivid and concrete, the appearance can be copied. 3. Make a comparison

Distinctive, prominent, concrete. Comparison is an explanatory method that compares two things or phenomena of the same or different categories to illustrate the characteristics of things. Explain some abstract or relatively unfamiliar things, and compare them with concrete or familiar things, so that readers can get a concrete and distinct impression through comparison.

The characteristics of things also tend to be revealed in comparisons. When making comparisons, it can be similar or different, and things can be "sideways" or "vertical".

1.Most burrowing insects, such as golden dung trees, always have a mound of dirt outside the cave. This sentence uses the method of comparison and example to compare the crypt of the "cicada" with the crypt of the "golden dwindle", and explains that the crypt of the "cicada" has no soil at all, so that the reader can get a specific and distinct impression.

2."Most of the cicada's tunnels are ......fifteen or sixteen inches deepThis sentence uses the method of illustrating the number of columns.

Explanation method sentence appreciation of the cicada in the eighth grade:

1. Cicada uses a lot of illustration methods, there are examples, the function of this illustration method is to make the object of the description specific image, easy for readers to understand, its main role is to make the object of the description vivid and vivid, enhance the interest of the article.

2. It also uses the classification method, and the main function of using the classification method is to make the description more organized and clear, arouse the reader's interest in reading, and lead to the most obvious feature of the cicada that is the object of the explanation-singing.

3. It also uses the method of comparison, its main function is to make the object of description vivid and vivid, and enhance the interest of the article.

4. Introduce the body structure of cicadas, because there are huge castanets in the body, so that the vital organs have nowhere to place, so they have to be pressed to the smallest corner of the body.

"Cicada" is an essay written by the French writer Fabre, from his work "Insects". This article describes the characteristics of cicadas from two aspects: the burrows of cicadas and the eggs of cicadas.

Raising his voice from afar, not by the autumn wind.

An explanatory method of interpretation is used.