About composition

Can I make a toad skeleton specimen?

Today, I participated in an extracurricular biological activity. The leader asked a group of us to cooperate and make a toad skeleton specimen.

A live toad, holding it in your hand, looking at its bulging eyes and pimpled skin is really scary. However, it is still very interesting for you to dissect and make a specimen of bone canal. If you are interested, let me introduce the practice.

The first step is dissection.

The first step; Execute. There are two methods: one is anesthesia with ether; The other is to destroy its central nervous system with a probe-first draw a "T" shape on its chest with a knife, and be careful not to damage the sternum when crossing, and then drill a few times on the spine with a probe, gently, so as not to break the spine. At this time, the toad whose central nervous system was destroyed was unconscious.

Step 2: Peel. Tear it down from the chest first, and then tear it from head to back, thus peeling off a piece of skin completely. If you tear it at will, it will tear the bone under the skin and the specimen will be incomplete.

Step 3: Remove the internal organs. Cut open the abdomen with a knife and carefully remove the internal organs. Then wash its body with water, so that the internal anatomical structure of toad can be seen at a glance.

Step 4: Remove muscles. Blanch the washed toad in boiling water for 5 minutes, and remove large muscles after taking it out. Then put the spine on with copper wire first, and then pick the meat, so as not to come after picking the spine. It is especially important to pay attention to that when removing the minced meat of the front and rear paws, you should be extra careful not to scatter the paws. Another thing to note is that the skull should be intact and cannot be disassembled. However, there is a black substance under the two bones. Take off the bones first, pick out the "black substance", and then stick the two bones together.

In this way, the toad's skeleton specimen is ready. Looking at this specimen, I feel a sense of accomplishment.

narrate

Rainy days, I remember. ...

The drizzle is floating again, tearing off pieces of melancholy. Looking back, holding up a lonely umbrella with my memory and looking at a wet gray basket in the sky, I can't help thinking: that day, the weather was not very good, but I still rode to my sister's house to get books, which was related to the mid-term exam three days later! When I got to my sister's house and got the book, I couldn't wait to go home. I rolled over and got on the bus, riding fast. Before long, the rain fell, and I felt very proud-because I brought an umbrella. In order to show my skills, I simply held the umbrella in one hand and pulled the handlebar in the other, and performed the "stunt" of "cycling with one hand". The car flew past me and the owners stared at me, which made me even more proud. ? Suddenly, 1 of "Wow ……", I fell to the ground with my car and people, got up and looked-the chain fell off! Now I'm dumbfounded, standing there at a loss. Rain also came to "demonstrate" at this moment, as if mocking my "madness" just now. The original raindrops gathered into rain columns and knocked on the thin umbrella surface. In the rain, I hold an umbrella and wait for a miracle helplessly, but I also know that this is a delusion. Who will stop in such a heavy rain? ? I stood alone in the rain, holding an umbrella, and I really felt like a leaf in the wind and rain. What should I do? ? In the dim light, I saw a figure with an umbrella coming here, near, near again ... "Uncle-",as if catching a life-saving grass at the bottom of the valley, I shouted at the top of my lungs, "Uncle-help, ok?" ? "Ah-? Uncle promised, "Little girl, what's wrong with you?" ? "My car ... my car ..." I don't know what to say at the moment. ? Don't worry, let me see? "Nothing, the chain fell off, I'll fix it." My uncle looked at the paralyzed car and comforted me. ? He squatted down and picked up the car chain on the ground ...? I stood by and tried to hold my umbrella ...? Finally, my uncle repaired the chain of the car and turned it several times by hand to ensure safety. He stood up and smiled and said to me, "Little girl, hurry up and go home quickly!" " " ? " Ah! Uncle … I … I … "I don't know what to say. ? "I'm leaving. Be careful. It's getting dark and the road is slippery." ? "ah-""ah? …… ? Outside the window, the rain is getting smaller and smaller, and everything in front of me is so refreshing. The phoenix tree outside the window was washed exceptionally clean, green and transparent by the rain. In the darkness, my uncle's smiling face appeared again. The beautiful scene in the rain will be fixed in my mind for a long time ... Rain, pure, scattered in my heart, like a pure song, nourishing the tender rings. Rain man hugged me tightly, returned to freedom, was no longer silent, rotated himself, and carved life with happy truth.

A soldier.

"Hey, why don't you watch Yan Luowang?" I feel glad in my heart, hum! That's great. While you are away, I can pass by the Military Sports Institute. When I mention this "Yan Luowang", I will hold my breath. The path that I went home recently is being renovated, so I have to go home through this military sports college. But I happened to meet this "Yan Luowang" and said that I had to have a pass to get in. I told the truth and the truth, but he stared at me and said, "This is the rule of our hospital!" " "Everything is pinned down. It's not. I dare to go there only after watching him fail. But I'm still not at ease. When I looked over there, I saw a PLA man guarding the gate and several passers-by.

So, I got up the courage and went straight over. On closer inspection, a tall young soldier stood guard. A neat uniform was soaked with sweat, and the green color of the uniform became stronger. He was carrying a shiny black submachine gun on his shoulder, and the whole person stood upright like an unshakable flagpole. At this time, he quickly took a card from a person and looked at it skillfully for a while. "ah! Shit, I have to check my pass again. What should I do? " Well, I'm a child. He seems to be new here. I believe there is no problem getting along. I made up my mind, so I stepped up and walked straight to the gate with my head down. "Little brother." A kind voice stopped me. I looked up at his appearance: his clean face was still a little childish, and his big black eyes were like two deep pools. "Where do you live?" "Well, it's inside." I pointed my finger at it. "Do you have a pass!" "Oh, I forgot to bring it when I came out this morning." "So, which building do you live in?" "This ..." I hesitated, and then replied: "10 building." "/kloc-building 0/0?" He showed a surprised expression. "Yes, that's right." I'm going in. "Wait!" A pair of big hands stood in my way. I looked up and saw him smile and say to me, "Little brother, we don't have a 10 building here." Oh, no, he saw through the lie. What should we do? Yes, reason with him. Thinking of me, I said to him, "It makes no sense to say that the people's soldiers are public servants of the people and even people are not allowed in." Instead of being angry, he smiled. "Yes, our army is to serve the people. But think about it, you have your home and I have mine. My home is this military sports college. Will you let strangers in and out of your house casually? " I felt a heat on my face and bowed my head shyly. "It's getting late, let you in this time. But don't come here again! " What? I can't believe my ears. I stared at him with my eyes wide open. Still that white face, or those eyes like two pools of deep water. "I know, I will never go here again. Thank you! "

I hurried through the gate. I don't know why, his short and simple words have been echoing in my ears. I couldn't help but turn my head and look at him again: he was still standing there like an unshakable flagpole, and his neat military uniform was still green. Oh, this is a soldier, an ordinary soldier.

The land of Mayflower

Taiwan Province told a sad story, the story of Paradise Lost. He used to be in the Garden of Eden, but in his 30-year-old life, it was only three hours. There, all the beauty lies in her. A girl in a blue veil glides across the river slope and stops in front of him. He knew that the love of his life had arrived, and when he held her hand, it felt like two people shared a heart.

We were by the river when Taiwan Province told this story. It's summer, willow branches are hanging lightly on the water, and fish are spitting. It is beautiful, but it is not the beauty of Eden. Teva swore that this river was the Garden of Eden on this day ten years ago. He fell in love with her because he couldn't stand the sweetness. When he woke up, everything disappeared. If he doesn't have fragments of her gauze in his hand, he will think that everything is an illusion. Oh, I think he heard her say, See you in ten years.

Now ten years have passed, when Taiwa was 20, now she looks more than 30, thanks to the suffering of missing 10 years. We waited by the river. I don't believe his story, but as a friend, I have an obligation to comfort him as a frustrated person. When the sun approached the water, a thin and dense sound suddenly sounded, like ... like the sound of grass buds breaking through the ground, and thousands of voices were pressed together. In a blink of an eye, the yellow flowers like Spanish dance skirts were unscrewed everywhere, and blue dragonflies and white seagulls appeared out of thin air. "Here she comes!" Teva burst into tears.

I heard a discordant sound: wheezing ... wheezing ... a one-meter-long brown caterpillar climbed up the river slope. I didn't dare to look closely ― would you like to observe a guy with a dozen legs and short hair that looks poisonous? Teva, like a demon, broke off a willow branch and rushed over. I covered my eyes and dared not look. A few minutes later, Teva had hidden the ugly body in the bushes. "It won't scare her." He said.

We continued to wait for two hours. That kind of small yellow flowers will wither after only half an hour, but one batch will wither and another batch will bloom again; Bai Ou is not the ornament of blue dragonflies, but their deadly enemy: it is eating them. If you don't eat it, the dragonfly will die of exhaustion in an hour or two. At this time, the flowers and dragonflies have flown to the end, and the number has decreased. The Garden of Eden will disappear.

Suddenly, a terrible premonition came to my mind, "Don't wait." I said to Teva, "Do you know what this place is? Mayfly country! These' dragonflies' are actually not dragonflies, but ephemera. The ephemera's flash in the pan is a rumor, but it is not. Like cicadas, they have to live underground for ten years before they can come out of their pupae. I once saw the expression "the land of ephemera" in a note novel in the Tang Dynasty, which appeared once every ten years, and all kinds of life in it were ephemera. That yellow flower is called' back-illuminated flower' and shines back and forth. In addition, there is a kind of' ephemera', which also appears once every ten years and lives for a few hours. It also needs to come from ugly caterpillars ... "

"Stop it!" Teva's expression almost went crazy. The kingdom of ephemera disappeared here, leaving only messy petals and blue elf-like bodies on the ground. I peeked at the bushes. The caterpillar he just killed used the rest of his life to hatch half of himself for her promise of "ten years" The head and body came out, wrapped in blue gauze, with a serene face like an ivory sculpture. A pair of legs is still the body of a caterpillar. Who would have thought that being so beautiful and ugly was the same kind of life?

Look who is wearing glasses.

There was a rich man in the state of Song. One day, the wall of his house was damaged by heavy rain. His son said it would be stolen if it was not repaired, and an old man in the neighbor's house said the same thing. In the evening, the rich man really lost a lot of things at home. The rich man thinks his son is very clever, but he suspects that the old man next door stole it.

Of course, according to the general public, the rich man's conscience is really bad. I don't care whether you say he is rich and heartless or that he should be chopped to pieces. One of my buddies once said: I read all the Confucian works and found that the old gentleman Kong said many good things in his life, but I think one of his words was wrong. What's so hard about raising a woman? Only rich and powerful tropical fish are really difficult to raise. Especially, with the raging tax investigation storm, the boss's flight and the frequent exposure of the rich, the brother's hatred for the rich is also intensifying. Regarding the attitude towards this story, he thinks that rich people should wash their mouths and hands with disinfectant before reaching this conclusion irresponsibly.

And I mean that I have always adhered to the traditional virtues of the Chinese nation, at least in my attitude towards the elderly. Although you can say that my arbitrary conclusions are emotional, I would rather believe that the old people are completely incapable of stealing with physical strength, so I believe that most bad people come out of the pile of young people. What's more, from the point of common sense, what is said is not done, and what is done is not said. Just as impotent people like to brag about their sexual excitement, you have never seen a thief warn his master before stealing: "Your brother will repair the wall and lock the door at night, buddy. I'm going into the house! "

Then, the blond child, the son of the rich man, said the same thing, but because of his blood relationship with the old man, he was not suspected but was considered smart, which made people think that the old man's eyes were either squint or indeed astigmatism. Although there is no doubt that his son is stealing, it can be seen that the old man is wearing color-changing glasses. It seems that it is really easier to love relatives than to love neighbors, and it is more practical to hate neighbors than to hate relatives. In other words, what is emotion? Affection is not that you look at me and I look at you, but that you and I look at him together-with defensive eyes.

So what do you mean by selfless and broad-minded? Do you think a person can sacrifice his life for justice, be impartial and honest? People's egoism is deeply rooted, but since people are social, they can't just rely on feelings, such as judges and prosecutors, landlords and old money, even though you have zero deposits!

Just like you can't wait for enthusiasm to save people, you can't wait for inspiration to write a composition. This is not only a question of professional ethics, but also a basic principle of being a man. I am not a missionary, but I still can't help saying: love the people in front of me, love all mankind, and love your neighbor as your son.

-Who are you looking at with glasses? Hi! Say you!

Argumentative writing

Creativity is more important than knowledge.

There is a competition problem for American middle school students' thinking Olympics, which requires students to design a water vehicle, but it is necessary to break the conventional mode, emphasize the thinking of seeking differences and embody the spirit of innovation. Many students have racked their brains to design various shapes of vehicles, but they can't get rid of the well-known shape and structure of ships. Only one student has a strange idea. His design works are like a giant "water spider". Instead of sailing on the water like a boat, he "crawls" on the water like a water spider. This work is unique and eye-catching among all the entries. Although the design failed in practice, almost all the judges gave him the highest score.

This is an example of cultivating students' creative ability. The society has entered the information age, and the new technological revolution is surging. All countries attach great importance to cultivating students' innovative spirit and creativity. Because creative activity is an important guarantee for human survival and the sustainable development of human civilization, and it is the source of human knowledge evolution. Creativity is more important than knowledge.

So, how to cultivate creativity?

Newton, a great scientist, said that he made great achievements because he stood on the shoulders of giants. This: "giant" can be understood as the embodiment of the knowledge created by countless predecessors. Accumulating knowledge is the foundation, and integrating knowledge is more important. Modern science and technology are developing in the direction of continuous differentiation and integration, and the growth point of new knowledge often appears at the intersection of disciplines and disciplines. Students who study liberal arts should know something about science, and students who study science should also dabble in literature and art. French chemist Lichtenberg said, "A chemist who only knows chemistry may not really know chemistry." It should be the common pursuit of contemporary high school students to read widely, learn extensively and memorize, make the past serve the present and draw inferences from others.

The more knowledge we have, the easier it is to produce new associations, new insights and new creations. But if we know too much about the traditional meaning of something, it will hinder the flexibility of thinking and make us involuntarily led by the nose by our predecessors, thus forming intellectual obstacles and leading to the rigidity of creative ability. Many people in ancient and modern times, at home and abroad are hardworking, but throughout their lives, they are accumulating rather than creating, and they are all tired and trapped by knowledge. Students should learn to empty the "cup" of their minds, leaving enough space for the development and change of ideas, so that knowledge can be flexibly aggregated, replaced, jumped and collided, and generate can spark creativity.

Be good at catching the hotline and recording inspiration at any time. A "hotline" is a mature idea and train of thought. Once a hotline flashes, we should seize it and dig deeper. Of course, we should also be good at grasping fleeting thoughts. For those new ideas, new concepts and new images that suddenly flash in your mind, you should take notes at any time, organize them regularly, think deeply and stimulate creativity. Inspired by the phrase "Nitroglycerin falls on the sand and condenses" in the notebook, chemist Nobel successfully solved the transportation problem of nitroglycerin. Every student should prepare a thought record book for himself. When new ideas and new inspirations flash in his mind, write them down in time, stick to them for a long time, form habits, and gradually cultivate agile thinking quality and outstanding creativity.

Three benefits of reading

We often hear people sigh: "With so much work and so many ideas, how can we afford to study?"

Sounds reasonable, but it's not.

In fact, people's reading time is mostly squeezed out from their leisure time. The ancients said that "reading more than three", that is, those in winter are at leisure; At night, after the day; When it rains, there is time. Ouyang Xiu also summed up the "three theories of reading", namely: on the bus, on the toilet and on the pillow. Times have changed, and the "Three Plus Theory" may not be feasible today. Whether the "Three Plus Theory" is scientific or not is also worth discussing, but the spirit of squeezing time to learn is always worth promoting. Now "weekends", plus holidays and annual leave, have nearly 100 days of leisure time a year. Why worry about not having time to study?

Some people may say that leisure, as the name implies, is to rest. How to use it in reading? In fact, there is a question of how to understand "leisure". In my opinion, reading is also a kind of leisure, and it is elegant and high-quality leisure, which has at least three benefits:

⑤ Reading is a kind of enjoyment. All kinds of books, whether it is political theory, literary classics, poems and songs, or natural science, will be a pleasure as long as you read them. Lu You said in a poem: "Officials often owe money for studying, but Mi Lu doesn't give money for selling wine. I am glad that I have nothing to do today, burning incense and reading Yuxi poems. " Ding Ling also said with deep experience: "Reading is a kind of enjoyment. Reading is so tasty that you can forget everything ... "There are all kinds of leisure enjoyment. Some people like to sleep late, some people like to enjoy an outing, and some people like to enjoy surfing the Internet. Reading should also be a very good way to relax.

Reading can strengthen the brain and heart and prolong life. The more people use their brains, the smarter they become. American psychologists have found that the old nerve roots of brain cells can grow new nerves under the stimulation of new environment. Persist in reading and learning, and brain cells will be constantly updated. At the same time, reading can also concentrate people's thoughts, nourish the heart and refresh themselves, which is beneficial to physical and mental health. The book "Revolution of the Brain" by Japanese medical scientist Maoxiong Chunshan elaborated this theory of keeping in good health by using the brain in detail. He believes that when people relax and concentrate on a goal, magical ripples will occur in their brains. This kind of ripple can make the brain secrete a substance, make people relaxed and agile, and improve their thinking ability and creativity.

7 reading can also cure diseases. Reading books and newspapers can relieve people's troubles, eliminate mental disorders, and make blood flow smoothly, thus achieving the effect of treating diseases. In Germany, many hospitals have set up special libraries for patients. These libraries are rich in books, not only interesting books that nourish the heart and refresh the mind, but also various medical popular science books, newspapers, cassettes, famous songs and audiobooks that introduce the knowledge of recuperation and health care, providing patients with high-quality "book therapy" services.

What is advocated here is to cultivate reading interest and be good at seizing time to learn. B Not only can you learn knowledge and sharpen your thoughts, but you can also nourish your mind and keep fit. Where can I find such a good leisure activity? C use leisure time to read and benefit yourself. D Of course, if a good fashion that everyone loves books and everyone reads books is formed in our society, the quality of the people will be improved, the social atmosphere will be more civilized and the country will develop faster and better.

Write a landscape article

sakura festival

Spring is an elegant and equally romantic season, with green leaves, white flocks and blue sky as beautiful as a blurred picture. One rainy night, the moon crept through the clouds.

As the floor rises, the air at midnight is crisp and pure, and it is sad because of purity, and there is a subtle despair for the song coming from the roadside bar. A hoarse, intermittent tail

Swimming like water under the mountain dyed the air black.

After a night of spring rain, Kyoto remains the same. Like brocade, cherry blossoms are full of trees, and pink petals are falling in the breeze full of flowers-mountains.

Cherry blossoms, full of fragrance, soft and fragrant. I walked alone in Iwate's stone-cutting bushes, watching the flowers flying in the forest, as if I were an angel who fell into the world.

The cherry tree is surrounded by a huge granite stone, which just cracks from the middle of the rock. On the other side of Edo in the crevice, a vibrant cherry tree grows. "Go and ask the big shot.

Life is short, to live is as brilliant as cherry blossoms, and to leave decisively when you die. When the cherry blossoms fall, they are not dyed, but simply there.

Let people pity. Cherry blossoms are in full bloom at present. Petals with lingering rain and wet buttonwood leaves embrace in the wind and then leave, and the soft soil can't stand the scattered cherry blossoms.

With the fragrance of earth. Everything is so casual, but I don't know the "fragrance loss" of petals from flowers.

April wind blows the hair, making thousands of cherry blossom petals ferry with the wind, which is better than snow. Watching people enjoying cherry blossoms under the tree, the party was very lively. And I, only

Willing to form a wind for others: kimonos and cherry blossoms wearing shaking sleeves pass through the eyes and then disappear.

The wind still hasn't stopped "killing" and the cherry blossoms are still raining. When I walked out of the flowers, I saw a mysterious and ancient shrine. The roof of the club has been covered with mountain cherry blossoms, and

Next to the club is a running stream down the mountain, with cherry blossoms floating on the water. Everything never stopped, even for a moment, and I was not depressed. I picked up a petal and put it in.

In the prayer basin. Hope and prayer: The afterlife is still an elegant moment for the dead who turn over cherry blossoms. Let nature take its course and get favorable comments. . . . . .