1. Exercise 4, Volume 2, Grade Four Write a short passage about smog and our life.

This winter, the smog weather has attracted everyone's attention, and the smog is even more harmful. Several cities have won, so we should strengthen environmental management and not let smog weather wreak havoc.

Many people must know the cause of smog. Of course, smog is composed of fog and haze. The main cause of fog is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the ground air, which is the product of water condensation in the near-ground air. Fog mainly reduces visibility and causes traffic hazards, but it does little harm to people.

Haze is composed of dust, sulfuric acid, nitric acid and other harmful substances in the air, which will make the atmosphere turbid, blur the line of sight, reduce visibility and do great harm to human body. In this way, fog and haze, two unrelated brothers, came together and caused unprecedented damage to the atmosphere. The air quality in some cities has reached the level of moderate pollution, and some cities have reached the level of severe pollution, which is very terrible.

Haze is very harmful, which will affect roads, railways, aviation, power supply systems and crop growth. It is also easy to lead to the spread of infectious diseases and the occurrence of various diseases. Endanger people's health. Moreover, it will make it difficult for pollutants in the air to diffuse, enhance the toxicity of harmful substances, and even lead to toxic fog in serious cases. And it will do great harm to people, especially to the respiratory system. It is reported that the number of people suffering from respiratory diseases this winter has increased by% 30-%40 compared with last winter. What an amazing number this is, which deserves our deep thought. Therefore, it is urgent to prevent haze weather.

Our preventive measures should be in place, and morning exercises and outdoor sports should be stopped in foggy days. That's not enough. I think the main reason for this bad weather is the emission of automobile exhaust and industrial production exhaust. Therefore, the state should introduce policies as soon as possible to manage and control the emission of harmful gases, plant more trees and grass, and purify our environment. I think, if everyone mobilizes, the foggy weather should run away despondently.

In short, I hope everyone can take action, plant more grass and flowers, protect the environment and create a green and natural environment for our future generations.

2. Write a composition about 400 words about environmental protection, 1, a composition about environmental protection.

The phrase "everyone is responsible for protecting the environment" can be seen everywhere! Someone just doesn't follow.

On Tuesday morning, Yan Ziyi accidentally dropped a large roll of napkins into the water. Poor thing, a large roll of napkins was "sacrificed" like this.

Yan Ziyi picked up the napkin. I thought she was going to throw it in the trash. I didn't expect her to be so lazy. The trash can is in the back, and she doesn't want to walk over and throw it in. Unexpectedly, when we opened the window and threw it out, a piece of white garbage floated into our contract area instantly. Alas! In a blink of an eye, there was another piece of garbage in the contract area, and the students on duty in the contract area had to work hard again.

I just found out now that as long as I sit by the window, many people are too lazy to throw garbage into the trash can. Just open the window and throw it away. No wonder our contract area was deducted 1.5 points on Thursday! This is really asking for it. In addition, each group of students will sit in the north window. According to this calculation, if the students in the north window throw three garbage a week, then after one semester, our contract area will not be called the contract area, but the garbage area.

If Mr. Zhong asks us to pick up garbage in the contract area again, the students will definitely complain again. It's easier to throw rubbish than to pick it up! Therefore, it is everyone's responsibility to protect the environment, and it is convenient for you, me and him not to litter.

2, environmental protection composition about 400 words.

On the trash can, there is a poster nailed to the front: "Be hygienic, love cleaning, and put the garbage into the box." The scarlet letter on a white background is very striking.

I was carrying a dustpan full of garbage in one hand, two steps away from the dustbin, and I rushed to the mouth of the box and slammed the dustpan. Bang, the dustpan is full of rubbish, and more than half of it is scattered outside the box. Just about to turn around and walk back, I suddenly stopped and looked at the placard: "Pay attention to hygiene, love cleaning, and put the garbage in the box." I want to go back and pick up the rubbish, but I think, "Why should I?" What a waste of time! I have to go back and do my homework! "Then I turned and left.

After a few steps, a little brother stopped me: "Brother, you spilled the garbage outside!" " ""So what? "I don't bother to ask." Brother, the teacher told us to take care of the environment before, so you can pick up that pile of garbage! "My little brother insisted, but I ignored him:" I don't care about the environment! "I won't answer it!" I said loudly, "You don't care about me!" My little brother was scared away by me, and I left triumphantly.

Suddenly, I stopped and looked at the pile of rubbish. I feel that people around me are watching me, so I dare not look up at others, only dare to look at the pile of garbage. I've been staring at that pile of garbage for a long time, and I don't know if I should pick it up. In my mind, it's like two people fighting, one saying yes and the other saying no. I don't know what's going on. I'm very scared and scared. I am afraid that my parents will ignore me and my friends will ignore me. Thinking of this, I still picked up the pile of garbage.

At this moment, I am very happy, and my heart seems to have put down a heavy burden. I don't have to worry about my parents leaving me alone; Don't worry about my friends ignoring me; Don't worry, everyone is watching me! Now that I think of that little brother, to be honest, I really appreciate him a little.

After today's events, I understand what is meant by "stressing hygiene and loving cleanliness". Understand what "it is everyone's responsibility to protect the environment"!

3. Write an 800-word composition with no study but sweeping the street as the main topic. He is very talented. We had a good chat. This is my teacher. "He saw that we all stopped talking, so he asked us that xu teacher would come late and not deduct points for our class. He has never been partial to any student: "What are you talking about? Don't make any noise. Tell me. No one cares about discipline and directly deducts points from our class. "

Xu teacher is such a teacher. Xu teacher is here again. He saw us talking, and we talked about the plot in the game.

When xu teacher sent the school track team. I don't care. I should learn to relax. Every time we are criticized, we believe it. "Humorous teachers must be strict teachers. I remembered what the math teacher said, and I understood why xu teacher deducted points from our class. Chatting with the classmates of the road team, this time I deducted the points of our class directly from the record sheet, which is simply a teacher who can blend in with the students. Is he fair again? " I only know which company made it, although my black hair is not long.

Xu teacher has a good relationship with us. He is my art teacher, xu teacher. He was happy after listening to it? Tell me about it. I think xu teacher is so unreasonable and so nice. The teacher not only talked with us about learning problems, but also didn't know how to do it. I was angry at that time, and I was also very strict. He told us in detail about the scientific knowledge of three-dimensional film making, and our head teacher went out again? It doesn't matter, I still chatted with my classmates next to me: "Do you know how the cutscenes in that game are made?" Our eyes are bright, which reminds us to be quiet when gathering. We all listened very carefully! " We told xu teacher about the game we were talking about, and we started talking generously. Unexpectedly, the requirements for us are not relaxed at all, selfless, famous and fair teachers. A teacher who mingles with students must be an impartial teacher who can think and ask questions. Let's look at xu teacher, who often tells us some ancient poems: It doesn't matter, but every student who makes mistakes will definitely try to make the people who make mistakes make up and correct them! I'm also interested. Later, I said.

Mr. Xu is tall, but he combs neatly, but Mr. Xu suddenly comes over and leaves school.

Once held a health knowledge lecture. As long as we are interested, he is the talent I know: "Is it a game chat?" So it was xu teacher's turn to be the teacher on duty that day. Only xu teacher comes to my best teacher every once in a while.

Some teachers can speak.

4. Write a composition with the theme of caring about the school and respecting teachers. Requirements: 1. The beautiful campus is our happy home and the place where we study and live every day. Its environmental sanitation has a direct impact on us. At the same time, school environmental sanitation is also an important symbol of civilization. Each of us should take the responsibility of protecting the environment of the class and school. When I see the campus, I sometimes throw waste paper everywhere, which makes me feel very sad. To this end, I am determined to protect the campus environment, starting from me.

During this time, I often see waste paper on the ground at school, and I will take the initiative to pick it up and put it in my schoolbag. Today, the school showed a video of actively picking up paper. In the video, some students took the initiative to pick up the waste paper when they saw it, and some students saw it but walked by the waste paper casually. This video makes me feel that it is limited to protect campus sanitation by personal strength, so I want to appeal to my classmates loudly. From now on, let's act for our beautiful campus! Let's do it together, without damaging a flower, a grass and a tree, wasting a drop of water and electricity, tearing, littering, spitting and doodling. When you see waste paper, please take the initiative to bend down, pick it up and take it out of the campus, because we not only pick up garbage, but also pick up morality.

Students, a good campus environment needs you and me to create and maintain together. For the sake of our beautiful campus, let's work together, let's "show mercy and never leave"! In order that we can study in a beautiful environment, please start from me and start from scratch to create a beautiful and warm campus together. I believe that through everyone's efforts, our school will become more beautiful, cleaner and neater.

5. Write a composition of about 800 words with safety as the theme. Food is the most important thing for people. Food safety is a major event, which concerns people's health and lives.

The broadcast on TV and the report in the newspaper revealed the jaw-dropping truth: the foam teacups that made us drool were actually processed from the unsightly "underground factory"; That red date, in fact, is a blue winter date, soaked in the medicine, and changed color. Recently, the well-known "Sanlu milk powder", which caused a nationwide uproar, made people panic.

How can we believe that the food we eat every day is safe?

In primary school, I was always attracted by the delicious barbecue, boneless chicken fillet and stinky tofu on the way to and from school. These dazzling foods made me drool at high altitude in thousands of feet for three days, but I didn't know whether it was harmful to my health, so I had to shrink back and swallow the saliva in my mouth, and I had to stay away from these temptations. But I really don't want to eat? Absolutely not. In the final analysis, it is food safety that makes me doubt, so I am confused between "delicious" and "safe".

Just like the "Sanlu milk powder" incident, the dairy products of many dairy companies such as Yili and Mengniu were found to contain melamine, and the sales of dairy products in the market dropped sharply. People question the major brands of dairy products, and many newborn parents don't know which brand of milk powder to choose for their children!

It stands to reason that food safety is a matter of course. But now who can guarantee what food is safe? Food safety should not rely on reprinting the shelf life to muddle through, make money without conscience, and take people's health as a bet!

Food safety once again sounded the alarm, and relevant departments should pay more attention to food safety. Strengthening food safety, improving the ability of food hygiene supervision and inspection, finding hidden dangers in time and nip in the bud are the urgent tasks of relevant departments!

Where can I find safe food?

May junk food stay away from us, let healthy food accompany us and make food safety everywhere!

6. Write a composition about "rain" and listen.

When I was a child, I lived under a tile-roofed house. Whenever it rained, I could hear the intermittent and mournful sound of rain. When I grow up, I live in a reinforced concrete forest, and I can't hear the sound of rain. It seems that life lacks a lot of aura, something that can make people feel soft and weak, and my heart is slowly desertification.

So I miss the rain in the tile house.

Rain is weak and the lightest thing in the world. It can't knock down heavy reinforced concrete buildings. And the tile house, with raindrops on it, jingled and immediately made a pleasant sound. People who live in huts are also blessed to be close to nature in the rain. When the rain is sudden, the sound is generous and violent, just like hundreds of horses singing together, Malik gallops. As the rain slows down, the sound becomes weaker and seeps into your heart gently, like the breeze in your ear in warm spring. These tiles seem to be specially laid for rain. They play dutifully, and the hearts of those who listen to the rain will overflow with endless affection.

People like to sit quietly and listen to the rain when their hearts are full of nostalgia and regret. The old people have the ambition of "lying in the middle of the night listening to the wind and rain and dreaming of the iron horse glacier"; Dying beauty has the bitterness of "raindrops brighten yellow leaves and lights illuminate my bald head"; Acacia lovers have the vision of "the phoenix tree is raining, and it will drop at dusk"; Affectionate poets have the daydream that "the small building listens to the spring rain all night, and the deep alley sells apricot flowers."

Rain has become an emissary for people to decorate their feelings and place their wishes.

In my spare time, I was lucky enough to go back to the place where I used to listen to the rain. It happened to be raining lightly that day, and I heard the familiar and unfamiliar sound of rain. In the mist, there is a strange mood in the rain, and we haven't communicated for a long time. It keeps me away and shows me that it is strange to me, but I can feel the breath of its existence from the deepest part of my consciousness. There is a sense of carefree waking from a dream and a sense of vicissitudes after confusion.

Oh, what I met in the rain was the self separated from time and space, and it was telling me everything before. I hesitated. I asked myself: Who am I? Still the old me?

There is a saying: "Young people listen to singing on the rainy floor, and the red candle is faint." In the prime of life, the boat is listening to the rain, the river is wide and the clouds are low, and the broken geese are called the west wind. "Different life situations make people feel different when listening to the rain. However, listening to the rain is all about listening to the dialogue of the soul, listening to the flow of true feelings and listening to the flow of years. In addition to the echo of the years, the sound of rain also brings regrets of the past and melancholy that I want to talk about again. It seems that only in the light rain of this tile house can the soul breathe and life continue.

The rain is still ringing, like my real heartbeat.

7. A composition of about 500 words with the theme of economy is urgently needed in cities in China, especially in large and medium-sized cities. The shortage of water resources is also an embarrassing problem faced by people. China's per capita water resources are only a quarter of the world average, but the water consumption is huge. Like Beijing, the per capita water consumption is four times the world average. So, don't think that saving water has nothing to do with you. A dripping faucet can leak 70 liters of water a day, which is 25 tons of water a year. In our life, such loopholes are not uncommon. Besides setting up water-saving consciousness, what other tricks can we use to save water?

In fact, it is easy to save water as long as we pay attention to the little things around us. For example, remove heavy oil stains from tableware, and don't wash it directly with detergent. Wipe clean with paper before cleaning, which can save more than half of the water.

When washing hands, washing in a basin saves more water than running water, and the same is true when washing vegetables and fruits or washing dishes. Continuous washing with the tap on is very water-consuming, and intermittent washing can save water. Save water and reuse it.

The washing machine at home consumes a lot of water. In order to save water, manufacturers and researchers have made great efforts to save water as much as possible on the premise of ensuring the cleanliness of clothes.

This inclined shape is not for beauty or originality, and the inclined plane design of 10 degree has its own reasons. After the washing drum is tilted 10 degree, its water level is relatively deep, which can achieve a large number of washing effects. So save water.

The program set by the washing machine is generally one wash and two rinses, and water is mainly spent on rinsing. If washing powder is not used, won't rinse water be saved?

This ultrasonic washing machine can send out 20,000 shock waves per second, which can "shake" the dirt on clothes. A special water electrolysis device is also installed in the washing machine, which can decompose water molecules in tap water into hydrogen ions and oxygen ions, and use the ions to decompose and adsorb stains and dust to clean clothes. Two-pronged, this washing machine without washing powder saves more than 30% water than ordinary washing machines.

Also, the water level of the washing machine should not be set too high, otherwise there will be no friction between clothes, and it will waste water if it is not cleaned.

In addition to washing machines, toilets are also a major household water user, accounting for about 35% of residents' water consumption. A family of three will wash away more than 3,000 liters of water a month.

Technicians have developed a new type of toilet, which only uses 4 liters of water each time, saving one-third to one-half of the water compared with the existing toilet.

Its water tank accumulates air while filling water, compresses the accumulated air by using the pressure in the water supply pipeline, and then pushes the water to flow into the bedpan at a higher speed. Different from the "pull" force of traditional sanitary ware, this new sanitary ware uses "push" force to discharge dirt, which has great impulse, so it can save water.

In fact, other domestic water can also be used to flush toilets. For example, after the last rinse, the clothes are washed clean, and the water discharged from the washing machine looks cleaner. Unfortunately, it flows directly into the sewer. There is also water such as washing your face and vegetables. It would be nice if it could be reused. Wu Hanping, an amateur inventor, developed a set of domestic water reuse device and obtained a national patent. He connected the sink in the kitchen, the basin in the bathroom and the water tank in the bathroom to a water storage tank. Clean water from the sink and basin enters the storage tank for flushing the toilet.

8. Write a composition with the theme of flying dreams. The dream of 800 words is immortal.

Martin Luther King said, "If your dream is still there, then no one can make you fall".

Looking up at the night sky alone, facing the vast night sky and stars, I don't know how many people have released their dreams, hopes and future. The colorful starry sky has witnessed the realization of many great dreams. Humans have gradually moved from barbarism to civilization and from the past to the future. ...

The original dream of mankind is naive.

Seeing birds flying in the air, we dreamed that we could fight the vast and boundless sky freely like birds, so we had airplanes.

Seeing fish swimming in the water, we dreamed of swimming happily in the boundless ocean like fish, so we had a boat.

Seeing everything in the world and dreaming beyond everything, there is now. ...

Just like every stream dreams of merging into the sea, it runs endlessly for this purpose;

Just like every tree seedling dreams of growing into a towering tree, it thrives for it; Just like every young eagle dreams of embracing the blue sky, it is strong enough to spread its wings again and again.

It is precisely because of having a dream and strengthening the belief in realizing it that many people who are not afraid of difficulties advance wave after wave, which makes it impossible for their dreams to become a reality. Mankind has never stopped searching for beautiful dreams.

Copernicus was persecuted because he dared to doubt the scientific nature of geocentric theory and bravely put forward "Heliocentrism". Bruno was burned alive for propagating the truth of Copernicus. However, later generations did not flinch. Galileo realized his dream and proved the scientific inference of Heliocentrism. This process is difficult and long, but because human beings have dreams, they persist in their dreams and finally their dreams come true.

In order to dream, some people work hard. And some people just lie in the cradle of their dreams and wait hard. Those who work hard will reap the joy of dreams coming true; A person who wastes time only gets the regret that time stays on his face, and finally achieves nothing and wastes his life. Although not all dreams can be realized, but "settle for second best, networking is the best." Instead of taking time to wait, it is better to speed up the pace to chase your dreams and try to race against time. Maybe you are physically and mentally exhausted, but you will reap a full life in sweat. What about us now? It's time to ignite your dreams with youth and insert the wings of knowledge into your dreams!

Martin. Lu Se. Kim made a speech entitled "I have a dream". He worked hard for his dream and finally gave his precious life. He didn't fully realize his dream, but his dedication, his pursuit and his persistence gave the world an example against racial discrimination, and people remembered him and therefore commemorated him. Look at today's American President barack obama-the Kenyan-American black president is Martin. Lu Se. A powerful interpretation of Kim's dream coming true. Let us see that there is no discrimination and dispute between human beings because of different races and colors. Let us remember that human beings are a big family, and we share the same home-the beautiful earth.

Dreams are the extension and expansion of life, the driving force of human progress and the source of creation. Let's embrace our dreams. Life goes on and dreams go on.

9. Write an 800-word composition with novelty as the main topic. In life, if you open your eyes wide, you will find many strange new things. At some point, a new thing happened to me from the sky-naughty king Xu? Propose to me! It was a crisp autumn afternoon, and I was listless, listening to the math teacher. Just as my eyelids were fighting, the "life-saving straw"-Ben finally came late. The math teacher, very happy, heard the bell ring and had to say "class is over."

Many students who finished the basic movements in their seats rushed to the corridor with lightning speed. As for me, I still sit in my seat lazily, enjoying the wisdom and happiness brought by books.

At this time, the science teacher came into the classroom with a bunch of chrysanthemums in bud, which smelled fragrant and attracted many students. They surrounded the chrysanthemum with three floors outside and three floors outside, as well as the famous naughty ghost king Xu? What's more, I took the lead, jumped up step by step, grabbed the bunch of chrysanthemums with those "colorful claws", looked left and right, and then turned my eyes to me. A bad smile appeared on my face, and I knew something would happen the next day. So I think: 36 plans is the best policy, I think I'd better run first. Thinking about it, I immediately ran like a sword, but I didn't expect it to be Xu. Take the lead.

Then, a historic moment began. Have you seen Xu? Blocked me at the door, proudly tossed my head, bowed to me with a gentleman, and presented that bunch of chrysanthemums that were tortured to death by him.

He said to me, "Excuse me, Miss Mao Yicheng, who is as beautiful as an antenna, will you marry me?" I will take care of you all my life! ...... "Listen, I feel in distress situation. At this time, many students are scrambling to join in the fun. Could it be me and Xu? Surrounded tightly, whispering in groups of three or five. I thought: aren't these all advertisements on TV? How did you learn from this naughty king? So many students have heard about it and witnessed it. This time, I can be a news person in my class! How can we have a beautiful and satisfactory solution? I'm as anxious as a cat on hot bricks-running around.

Just when I was faced with such an embarrassing situation, Class * * * helped me understand the "siege of Deng Bai". Seeing that there was no big news, the teacher's eyes were fixed on Xu, and the students dispersed in a hubbub. It was so creepy that he had to return to his seat angrily. I took a deep breath and thought, * * * class is really timely rain! Otherwise, I really don't know that this marriage proposal storm will not come to a successful conclusion until the Year of the Monkey.

If you want to see the truth, pay close attention to it everywhere. Let's open our eyes, explore together and find all kinds of unexpected new things in this vast world.

10. Write a composition according to my father's education. 150 my father.

Speaking of my father, he is very ordinary and ordinary, but it is such an ordinary and ordinary father who has given me extraordinary love. His thick eyebrows are matched with a pair of keen eyes, as if nothing could be concealed from him. On his broad forehead, several wrinkles showing strong will are deeply engraved. He often has a kind smile on his mouth, and he is burly but slightly fat.

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When I made a mistake, my father seldom beat me and scolded me, but patiently told me why I made a mistake and what the consequences would be. In a word, his words always persuade me not to make the same mistake again. Every time I take an exam.

When it's not good, dad always reads the test paper carefully. If I am not careful, he will let me pay attention next time. If I lose points because I can't do it, he will patiently explain it to me until I understand it.