Snails write their own compositions.

1. Write a composition according to the snail you have observed and ask to imagine yourself as a snail.

One day in the summer vacation, the rain cleared up. My mother and I walked in the community, and the fragrance of grass after bathing was overflowing, which made people relaxed and happy.

I suddenly found many small snails climbing up the flower bed one by one. Maybe they came for a walk and smelled the grass. They crawled slowly with their houses on their backs. They look so cute! Wherever they climbed, they left traces like silver lines. I opened my eyes wide and asked my mother curiously, "Mom, are snails pests or beneficial insects?" Why is there a silver line where they climb? Mom smiled and cocked her head and replied, "Do you want to know the answer? Just find it yourself! "

Hum! Find it yourself! I caught three snails, first put them in a clean and beautiful box, then put a piece of tender vegetables and rice in the box, and they all scrambled to climb on the vegetables and chew them. After a while, I ate all the vegetables. I don't even smell rice. I preliminarily concluded that snails are pests.

I began to analyze "why is there a silver line where snails climb?" I put the snail in my hand and it immediately climbed into its home. I had to hold my breath and stare. After a while, it poked its little head out in fear, made a reconnaissance to see if there were any enemies around, and then stuck its head out carefully. My hand was just about to touch it when it shrank back timidly. I was very angry. It accidentally fell down, and with a bang, its shell was broken. I picked it up with my hand and felt sticky. I didn't know what it was, so I looked it up in the book. Oh! So those little things are its feet! That silver thread is a gland at the foot of a snail, called the foot gland, which secretes mucus. This mucus has a lubricating effect, which can reduce the friction between the snail's feet and the ground and help it crawl. So snails leave mucus everywhere they climb. When this mucus dries, it turns into a sparkling saliva line. Oh! I see! The book also wrote: Snails like to eat rotten plants, and after eating, they will eat fresh plants and young leaves, so I can conclude that snails are pests.

Children, science is all around us. As long as you are good at careful observation and careful analysis, you are an amazing "little scientist".

2. Write a 600-word composition on the topic of "relying on yourself". Everything depends on yourself. Parents may have said it a hundred times. They asked us to rely on ourselves when something went wrong. In fact, everything depends on oneself, that is, self-reliance, which is not only a sign of maturity, but also the quality of every successful person.

There is an inspirational fairy tale about a little snail asking its mother why they have to carry a big and stupid shell. His mother said, "We can't run fast enough to fly. We need a hard shell to protect ourselves. " "That earthworm elder brother? It can't run fast and can't fly. " Asked the snail. "It can drill the ground and the earth will protect it." Mother snail replied. "What about the caterpillar sister? It can't run fast and can't fly. " The little snail asked again. "It will become a butterfly, and the sky will protect her." Mother snail replied. "blare. . They will protect them one day, so who do we rely on to protect them? " The little snail cried and asked. "We rely on ourselves, and we have a shell to protect ourselves." Mother snail replied. This is a simple fairy tale that tells us a survival skill: survival of the fittest and elimination of the unsuitable. Life is a process of survival of the fittest. If you want to survive, you can only strengthen yourself by yourself. If you can't stand on your own feet, how can you survive?

Poor people can't stand on their own feet. Do they want their parents to support them for life? In ancient times, there was a rich man who loved his son until he was 30 years old. Soon after, his wife died and his son became his only relative. Therefore, he dotes on his son even more, and even prevents him from working and learning technology, for fear of losing his only relative. This led to his son's incompetence. One day he went to play with his son and met a fortune teller, so he made a fortune-telling. As a result, the rich man can live to be 80 years old and his son can live to be 60 years old. His son cried, and he said, 10 years after his father died, what should I do? This fully shows the incompetence of the neet people, and also shows that people who can't stand on their own feet can't survive without something to rely on.

In a word, self-reliance is necessary for everyone, but it is often affected by the environment. If you can't take care of yourself, you will be ruthlessly eliminated by society.

3. Write yourself as a snail and write a composition with "a snail's day". "I want to climb step by step and fly forward on the blade of the highest point. I have big dreams in my married life ..."

I listened to Jay Chou's Snail again, and I felt a lot every time I listened to it. Take this as my motto!

"I want to climb step by step and fly forward on the blade of the highest point. Little days, big dreams ... "This is the lyrics of the snail. "I want to climb up step by step and fly forward on the blade of the highest point" shows the snail's firm perseverance and perseverance, and "small life, big dream" makes me think that everyone should have a dream. Dreams are beliefs that support people's thoughts. Without dreams, people have nothing. Dreams are beautiful, but many of them cannot be realized. What happened? It is because of the lack of snail spirit. When the snail "climbs" upwards, it may slide down 1 m 2 meters upwards, but the snail is not afraid of suffering and fatigue, and continues to climb upwards, and finally it can fly forward on the highest leaf and fly to its own sky. I think we all lack snail spirit. With the snail spirit, everything is simple. For example: study, you are not afraid of hardship and fatigue. Listen carefully in class, take notes carefully, do your homework carefully after class, and review well. The exam is a piece of cake, no problem!

I want to climb up step by step like a snail and fly to the blue sky on the leaves. I hope that friends who have never heard of it will listen to it and get some insights from it. I also hope that everyone will have the snail spirit and build our motherland better! I am Daoxiang and Fairy. I hope everyone can support me and have the same snail spirit as me!

4. the composition "live by yourself" is 800 words. I always feel a little irritable and exhausted these days. The biological clock is constantly changing, so I forget what is day and what is night. I only know that waking life is daytime and sleeping life is night. But life is always black and white, and life will always be lost. Life is not life, but life is life, which requires hard work, no waiting, and no need. Hard work and diligence will lead to success. The story of the snail inspired me: the story is like this. The little snail asked his mother, "Why am I born with this hard and heavy shell?" Mother said: "Because our bodies have no bones to support, we can only climb, and we can only rely on this shell to protect us." Snail: "Sister Caterpillar has no bones, why not carry this hard and heavy shell?" Mother said, "Because sister caterpillar can become a butterfly, the sky will protect her!" " "The little snail asked again," but the earthworm brother has no bones, can't climb fast, and won't become a butterfly. Why doesn't he carry this hard and heavy shell? Mother said, "because brother earthworm can drill the earth, the earth will protect him!" The little snail said, "We are too poor. The sky will not protect us, and the earth will not protect us! " "Mother comforted him and said," so we have a shell. We don't depend on the sky or the ground. We rely on ourselves! " "A person's fate is in his own hands. The key to his success depends on whether his way of thinking and thoughts are consistent with his actions and his attitude towards failure. Being a strong man is not as simple as talking casually! Especially those who live in today's world, you must have a mature mentality, rich experience, strong self-confidence and love. Success is close at hand, and success is around you. However, the first premise is that you must always keep a clear understanding of your goals and try to get close to them. Otherwise, everything will be in vain. It doesn't matter if you start low, because you have hope. Your dream is tomorrow, but the road to tomorrow is at your feet. You should have a winner's mentality. The power of success can be seen everywhere. Open your closed heart, and the sunshine of success will dispel the haze of failure. Ford said: Most people succeed when others waste their time. Darwin said: The way to finish the work is to love every minute, so you can grasp the fate of life by cherishing time and become a strong person in life. The same is true of our work. Did you work hard today? Have you set a goal for yourself? Did you fight for the goal you set? Did you finally achieve your goal? It depends on your own efforts, and no one can help you. Can only rely on their own struggle! Realize your goals through your own study efforts. I understand this truth. Snails all know to rely on their own advantages to compete with nature, let alone us! People must rely on themselves, your career, your family and everything you have to get it. Finally, the stage is as big as your heart. The secret of success is to rely on your own efforts.

5. It is better to rely on the sky than on your own composition. One day, the little snail left his mother and went to see the world alone.

It carries a heavy shell and climbs and climbs, but it can't climb fast. The weather is fine, and all the animals come out to bask in the sun. While crawling, the little snail greets his friends: "Hello, friends."

Small snails always think that other animals, like themselves, have shells. However, many small animals he met had no shells. They only carried heavy shells on their backs. Not to mention ugly, it is very inconvenient to move.

The little snail went back and asked his mother, "Why do we have to carry this hard and heavy shell all the time when we were born?" Mother snail said, "Because our bodies have no bones to support us, we can only climb, but we can't climb fast." . But this shell can protect itself. "

The little snail then asked, "that caterpillar sister has no bones and can't climb fast." Why doesn't she have to carry this hard and heavy shell? " Mother snail said, "That's because Sister Caterpillar can become a butterfly in the future, and the sky will protect her." The little snail asked again, "But Brother Earthworm has no bones and can't climb fast, let alone become a butterfly. Why doesn't he carry this hard and heavy shell? " Mother snail said, "That's because Brother Earthworm can drill soil, and the earth will protect him!" " The little snail began to cry sadly: "how pitiful we are!" "The sky does not protect us, nor does the earth protect us. What can we do? " Mother snail comforted him: "Son, we have no one else to protect us, but we can protect ourselves."

You see, sister caterpillar has no shell, brother earthworm has no shell, and only we have shells. They are all protected by others, only we don't rely on the sky or the ground, we rely on ourselves. "

Mother snail said, "Son, we don't depend on the sky or the ground. We depend on ourselves."

Reading the above story reminds me of the development of our country. During the Qing Dynasty, China closed its doors to the outside world and lived a feudal self-sufficient handicraft life. At that time, we were conceited and didn't know what industry was and what machines were. Finally, when the enemy invaded, we had no resistance and were repeatedly threatened by foreign guns. At that time, it was a disgrace to China.

Butterflies rely on the blue sky, earthworms rely on the earth, snails rely on themselves ... Blue sky is also dangerous, the earth is not the most reliable guarantee, and their own strength is not necessarily strong enough to support life. Just like China now, it is still vast in territory and abundant in resources, but we dare to say that it does not depend on the sky or the ground. Are we on our own? We can't. It is not feasible to build a car behind closed doors. After recognizing the advanced technology of western countries, the Westernization School took the lead in putting forward the idea of "using foreign techniques to control foreign countries". After the reform and opening up, we actively developed foreign relations, learned advanced western technology, and never dared to sell ourselves short again. So at this time, China occupies an unshakable position in the world, and the world should not be underestimated.

Life is precious. Being able to protect yourself, relying is also a way, and learning is also a skill. For the ridiculous so-called self-esteem, swearing to be self-reliant is a kind of rigidity in the eyes of others. Lao Tzu said, if you are poor, you will change, if you change, you will get through, and the general rules will last for a long time. Why stick to the rules when there are better ways to protect yourself?

We rely on the sky, the earth, ourselves and all available forces to make ourselves strong. At this time, the sky and the earth are no longer the trees we live on, but the abilities we have in our hands.

7. Write yourself as a snail, and write a composition every day. Snail spirit and dream.

"I want to climb step by step and fly forward on the blade of the highest point. Have big dreams in a small life ... "

I listened to Jay Chou's Snail again, and I felt a lot every time I listened to it. Take this as my motto!

"I want to climb step by step and fly forward on the blade of the highest point. Little days, big dreams ... "This is the lyrics of the snail. "I want to climb up step by step and fly forward on the blade of the highest point" shows the snail's firm perseverance and perseverance, and "small life, big dream" makes me think that everyone should have a dream. Dreams are beliefs that support people's thoughts. Without dreams, people have nothing. Dreams are beautiful, but many of them cannot be realized. What happened? It is because of the lack of snail spirit. When the snail "climbs" upwards, it may slide down 1 m 2 meters upwards, but the snail is not afraid of suffering and fatigue, and continues to climb upwards, and finally it can fly forward on the highest leaf and fly to its own sky. I think we all lack snail spirit. With the snail spirit, everything is simple. For example: study, you are not afraid of hardship and fatigue. Listen carefully in class, take notes carefully, do your homework carefully after class, and review well. The exam is a piece of cake, no problem!

I want to climb up step by step like a snail and fly to the blue sky on the leaves. I hope that friends who have never heard of it will listen to it and get some insights from it. I also hope that everyone will have the snail spirit and build our motherland better! I am Daoxiang and Fairy. I hope everyone can support me and have the same snail spirit as me!

8. Help write an article about 700 small snails, entitled "It is better to rely on the ground than the sky", and ask their mothers: Why do we have to bear this hard and heavy shell from birth? Mom: Because our bodies have no bones to support, we can only climb, but we can't climb fast. So we need the protection of this shell! Snail: Sister Caterpillar has no bones and can't climb fast. Why doesn't she have to carry this hard and heavy shell? Mom: Because sister caterpillar can become a butterfly, the sky will protect her.

Snail: but brother earthworm can't climb fast without bones, and he won't become a butterfly. Why doesn't he carry this hard and heavy shell? Mom: Because Brother Earthworm can drill soil, the earth will protect him. The little snail began to cry: we are so poor that the sky is unprotected and the land is unprotected.

Mother snail comforted him: "So we have shells!" " We don't rely on the sky, we don't rely on the ground, we rely on ourselves. "Students must have a deep understanding of the dialogue between Little Snail and Mom. Please write an article about 600 words on the topic of "dependence", which can describe experiences, express feelings, make comments and make up stories. The style is not limited, and the topic is self-made.

[writing tips].

9. Investigation composition about snails The investigation about snails has a strong survivability, and snails are found almost everywhere; In spring or autumn, if there is light rain, snails can often be found in corners, trees, leaves and grass-they crawl slowly with long tentacles and shells on their backs ... First, the reason for choosing the topic Snails are a common small animal. Since I was a child, I think it looks strange and often plays with snails.

After school, I learned it from the book natural science. I am interested in the phenomenon that snails swing their long tentacles, crawl on their backs and secrete mucus. Curiosity makes me pay attention to it. With observation, I have some doubts: Why doesn't the snail give up its shell and crawl? What is snail mucus for? Are snails valuable to humans? ..... These drive me to follow snails for a long time. Fortunately, snails are easy to catch and raise, which helps me to observe and explore it.

Secondly, after my official investigation, I caught several snails from Purple Mountain on April 26th, 2006, prepared a big transparent bottle, built a "home" for it, and observed snails with a magnifying glass. Through daily observation and diary writing, ask questions → establish hypotheses → explore experiments → collect data → conduct experiments again → draw conclusions by reasoning; Sometimes you need to consult a professional teacher to learn about snails step by step and uncover the secrets of snails bit by bit. After nearly half a year, I have a relatively complete understanding of snails.

3. Survey content 1. According to books, snails lived in water at first, and then went ashore to adapt to the environment. Their gills evolved into "lungs" (mantle) and evolved into land mollusks. Snails are widely distributed on land. There are more than 40,000 kinds of snails in the world. Although there are many kinds of snails, their internal and external structures are basically the same.

Attached are the internal and external structural diagrams of snails; Its vulgar characteristics: two pairs of antennae, ventral feet and spiral shell. Snails have high edible value and have certain medical, health care and beauty functions.

2. Through observation, we can directly find: the snail's head (eyes, nose, mouth and tongue), neck skin, breathing holes, abdomen and feet peristalsis, secreted mucus, excrement, excreta, snail shell (right hand) and tail. 3. Through observation and reasoning, it is found that the taste of snails, the neck near the shell mouth can secrete mucus, the abdomen foot can absorb water, the role of snail shells and their self-repair ability.

4. Through observation and experiment, the results are obtained: snail's vision, smell and touch, snail's eating habits (like wet and dark, afraid of dry and bright light). 5. Through observation and consultation, we realize that mollusks, evolution, mantle (breathing), cold-blooded animals, the reasons why snails sleep in winter and summer, internal structure, hermaphroditism and tongue.

6. Through observation, experiment and reasoning, it is concluded that snails have no hearing, the nerves of snails are concentrated in the movements of the top of the head and abdomen, snails crawl at a constant speed, and the role of mucus. Four. Investigation methods and results (1) snail's vision, smell, taste, tongue and touch.

Vision: Snail's eyes grow at the top of long tentacles, only the size of a needle's eye. Slowly approaching its eyes with a cotton swab, it was observed that the long tentacles of the snail only retracted at a distance of 5-6 cm from the eyes. Repeatedly, it was confirmed that the snail had vision, but its vision was very weak, and it could only see 5-6 cm away.

Smell: Snails (such as onions and mangoes). ) are fed with * * * flavored food. It is observed that they will raise their heads and crawl away with their necks crooked, and when the smell is strong, they will shrink into their shells, which shows that snails have a sense of smell. Taste: Snails must touch food with short tentacles before opening their mouths to eat.

Mix shredded white paper with cabbage leaves, and its short tentacles touch to find out the cabbage leaves to eat, then grind several lettuce leaves that snails usually eat together, and the short tentacles touch to pick out the lettuce leaves they like. Searching for food also proves that short antennae have olfactory function; Inferred from picky eaters, short antennae have taste function.

Tooth tongue: when a snail eats, it can be observed that its rabbit's lips and mouth are slightly open with a magnifying glass, from which it can quickly expand and contract its tongue for contact. Snail's tongue is unique, with more than 10 thousand teeth, called toothed tongue, and no taste cells.

When the tongue touches the food, it will scratch the food like a falling board of fruits and vegetables, which can be observed from the traces left by the leaves just eaten by snails, and when it touches the leaves, the surface of the toothed tongue will become thinner. Touch: reaction to the outside world.

Touch the tentacles, head, neck, shell and tail of a snail with a cotton swab. Snails will retract their bodies, and the strength of retraction is different.

Touch the tentacles and the top of the head, see the body retract into the shell, touch the neck and abdomen, find the head retract into the shell and touch the tail of the shell, but the body retract slightly. According to observation, the nerves of snails are concentrated on the top of the head.

(2) The crawling speed of snails. Snails crawl close to the abdomen, and the speed is very slow. Test the crawling speed of snails on different materials, and prepare glass, tiles and cardboard. First, put the feeding snail on the glass, put a square next to it, and tie a small piece of apple with thin thread to lure it. The food is about 5-6 cm within the snail's range. After a while, the snail came out of its shell and found that the apple was crawling towards it, gently pulling the thin line parallel to the edge of the ruler, so that the snail could only see and smell but could not eat the apple. The hungry snail had to climb all the way to get the apple.

Taking the tail of the snail's belly as the starting point and the end point, after 60 seconds, the crawling distance from the ruler is 12 cm, the calculated crawling speed is 0.2 cm/s, and the crawling speeds are 0.10.5 cm/s and 0. 1 cm/s respectively.

Snails crawl at different speeds on different materials, and glass climbs faster than cardboard. The reason is that the glass is smooth and the resistance is small. Observation conclusion: Snails crawl really slowly.

(3) Observe the movement and continuous crawling of abdominal feet for three times. Although the speed is different, it is found that the speed remains the same during each crawling process. The crawling speed of snails is directly related to the movement of gastropods. Observing the gastropod of the crawling snail from the back of the glass, we can see that the gastropod muscles contract from back to front, and at the same time stick to the surface of the object to prevent it from sliding backwards. When contracted to the front, the ventral foot is released and the snail can fully extend and slide forward. Abdominal foot muscles contract in waves.

After observing for a long time, it was found that the contraction frequency of wave type was constant, and the snail crawled on its arm, and its movement rhythm was consistent, so as to judge that the movement of abdomen and feet was uniform. After reasoning, it is concluded that snails do crawl at a constant speed. (4) Function of mucus 1. Snails are mollusks with soft bellies and feet.

Snail's gastropod will secrete mucus during crawling, so as to avoid direct friction between gastropod muscles and the ground, resulting in injury and adhesion.