(1) Learn to care about yourself.
At first glance, you may find this topic strange: care about yourself? Who doesn't care about themselves? Actually, you are wrong. Maybe, as you said, everyone cares about themselves, but not everyone will care about themselves, and some people will inevitably go astray, so today I emphasize: learn to care about yourself.
The truth of caring for yourself is actually very easy to understand, but if you only consider it from the perspective of "body skin and bones", it is superficial. Indeed, it is necessary to care about your health. "Health is the capital of revolution". But isn't a person's thought, morality, intelligence, knowledge, culture, position in society and contribution to society? Worthy of attention? If you don't care about these problems and only care about your own health, how can a person grow up in an all-round way? Obviously, we really need to learn to care about ourselves.
To learn to care about yourself, you must first understand yourself. Know not only what you need, but also what you "lack". The lack here refers not only to the lack of material life, but also to the lack of spiritual life, moral quality, social life, knowledge and culture. One person is missing. A person can't be perfect, and what everyone lacks is different. Therefore, only by knowing what they really need and what they lack can they cultivate and improve themselves. It is necessary to know that the premise of "medicine to disease" is "the right medicine". Only by truly understanding yourself and proceeding from your own reality can you care about yourself and your care will be effective.
(4) Learn to care about yourself and pay attention to objectively evaluating yourself. If you only see your own advantages and can't see your own shortcomings and deficiencies, you will overestimate yourself, be blindly complacent and lose the motivation to make progress. On the contrary, if you only see your own shortcomings and deficiencies, you will underestimate yourself, belittle yourself and shake your enterprising confidence. The purpose of caring for yourself is to drive away evil and promote good in constant self-discovery and self-reflection, rather than shrink back in narcissism.
At the same time, we should know the dialectical relationship between learning to care about yourself and learning to care about others. Learning to care about yourself is by no means selfish. You only care about yourself, not others. Society is a big family, made up of many people. We should form a good atmosphere of "I am for everyone and everyone is for me" in society, and make our society a warm and amiable family. At present, under the impact of the tide of market economy, interpersonal relationship seems to be "cold" than before, which should promote more care for others, and I think that people who don't know how to care for themselves will also care for others well. So we should learn to care about ourselves, so that we can learn to care about others better.
Now you understand that caring for yourself is not everyone's innate ability. Of course, it is not difficult to learn. As long as you constantly correct your shortcomings, improve yourself and make yourself develop healthily in all aspects, then your life path will surely become broader and more meaningful.
1. Explain the meaning of two idioms added in paragraph (4).
Self-mockery:
Self-appreciation:
2. What is the central point of this article?
3. What are the specific contents of "these issues" added in paragraph (2)?
4. How can a person learn to care about himself?
5. What is the argumentation method used in the fourth paragraph of the article? What is the expressive function?
6. What is the function of the underlined sentence in the sixth paragraph of the full text?
7. Is there a contradiction between learning to care about yourself and learning to care about others? Please talk about your opinion.
Reference answer:
1. This question examines the ability to understand idioms used in this article. These two idioms are no strangers. "Self-belittling" is learned in the article "A Teacher", which means "underestimating yourself too much". "Self-admiration" is also a common idiom, which means "metaphor for self-esteem and self-appreciation". 2. This question examines the grasp of the central argument of the article. As far as this article is concerned, the topic itself is the central argument, and the first paragraph of the article also puts forward the central argument. The full text revolves around the central argument of "learning to care about yourself". Answer this question, just copy it once and you will get a score. 3. This question examines the understanding of pronoun reference content. This question is not difficult. The answer can be found in paragraph (2): a person's ideology, morality, intelligence, knowledge, culture, social status, contribution to society and so on. This question examines the ability to understand and summarize the content of the article. Paragraph 34 (5) of the article talks about "learning to care about yourself" from different aspects, so to answer this question, we need to summarize the contents of these three paragraphs and express them in fluent language. Every paragraph of the article has a central sentence that reveals the content of this paragraph. Organizing these central sentences is the answer to this question. 5. This question examines the understanding of the model law and its expressive function. To solve this problem, we must have the knowledge of "demonstration method". There are four common argumentation methods, namely, cause argumentation, case argumentation, comparative argumentation and figurative argumentation. The fourth paragraph of the article mainly adopts the method of comparative argument, and demonstrates it from both positive and negative aspects. Its expressive function is to make the analysis more thorough, explain more fully and give people a more vivid and profound impression. 6. This question examines the ability to understand the expressive functions of important sentences in the article. The underlined sentences in paragraph 6 take care of the beginning of the article, which makes the full text echo from beginning to end and has a rigorous structure. 7. This question examines the understanding of the dialectical relationship between learning to care for yourself and learning to care for others. In fact, there is no contradiction between learning to care about yourself and learning to care about others. Learning to care for yourself is the premise and foundation of learning to care for others. Only by learning to care for everyone can we learn to care for ourselves better.
(2) Step on the ladder and jump on your own ideas.
I have long formed the habit of consulting and smelling new materials in the reading room regularly. No matter how busy I am at work, I will persevere. So I am very aware of the latest research results in the world, which makes my research work always stand on the basis of the latest research. What's more, I think we must have our own opinions when sorting out and using all kinds of materials, and we can't follow suit. Reading materials mainly look at other people's ideas and methods, get inspiration from them, and then look at other people's achievements on the basis of forming their own ideas. In this way, other people's results provide information for their own thinking, which often leads them to draw conclusions different from others' intentions, and other people's research results become materials to explain their own thoughts.
(2) For example, the problem of nitrogen mineralization, after adding tracer fertilizer nitrogen, the release amount increases, but people often ignore another aspect, that is, the residue of fertilizer nitrogen in soil. Based on this, I put forward my own idea, that is, is it possible that there will be no net increase after the release and residual offset? How big is the net excitation? Do you have any practical opinions about the amount of excitation? Not only from the difference between release and residue, but also from the percentage of net excitation in nitrogen application! According to this idea, I summarized all the relevant information collected at home and abroad, and found that the display values of most information are very low, and some are still negative; The same is true for dry land, which is generally only within 10%. And these actual errors are also around 10%. Therefore, the so-called net incentive is actually within the range of actual error, and it cannot be said that there is a net incentive. So I come to the conclusion that nitrogen can stimulate soil, in fact, through the transformation of microorganisms, there is no net excitation and no net release. This seems to be a mechanism problem, but it is actually a question of how to evaluate nitrogen. If it is really stimulated, it will promote the consumption of soil nitrogen and cause the reduction of soil nitrogen fertilizer. This problem is related to what index is used to evaluate the utilization rate of nitrogen fertilizer. Tracer method can not be used as the standard of agronomy evaluation, but can only be evaluated by difference subtraction. In this way, a conclusion is drawn on the basis of other people's research, which provides a theoretical basis for evaluating the effect of nitrogen fertilizer utilization.
If people follow the trend, they will never surpass it. Only by forming one's own ideas and thinking and looking at problems in many ways can we surpass our predecessors and never be bound by their thoughts. In my opinion, science is not only inherited, but also cannot be limited to the thoughts and conclusions of predecessors. It is necessary to sort out the information and put forward opinions from your own point of view.
(4) For the formation of ideas, I think it should be attributed to long-term mental preparation and whim. Many ideas come from the epiphany after long-term work, not from the workbench. Taking the problem to heart, I thought for a long time, and finally one day I suddenly came up with a "method". The key here is to be a conscientious person, pay attention to the breadth and depth when accumulating knowledge, understand all aspects of the situation and knowledge, and be familiar with all kinds of information. On this basis, it is possible to jump out of the circle of previous materials and conclusions, and your own ideas can flash out.
1. What's my main point?
2. What does "this" mean in paragraph (1)?
3. What is the reason why the author's research work is always based on the latest research?
4. What demonstration method is used in the second paragraph, and what is its expressive function?
5. The title of this article is "Stepping on the ladder of predecessors and jumping on your own ideas". What does the "ladder of predecessors" mean here? How is the "own train of thought" formed?
6. What beneficial enlightenment did you get from this article?
Reference answer:
1. This question examines the most basic ability to refine opinions in argumentative writing. Argumentative opinions are sometimes at the beginning of the article, sometimes in the middle, sometimes at the end of the article, sometimes they need to be refined by themselves, and sometimes the topic is the argument. The argument of this paper can be filtered out from the first paragraph: we must have our own opinions on the arrangement and utilization of various materials, and we must not follow suit. 2. This question examines the referential content of demonstrative pronouns, which is the most common question type in reading comprehension and the most basic reading ability. Generally speaking, the way to find the referred content is to find its previous sentence according to the pronoun. "This" in this topic means "My research work has been based on the latest research". 3. This topic examines the ability to extract information. To do this, we must first learn to analyze. The author's research work can always be based on the latest research. The reason should be "I have long formed the habit of consulting the latest information in the reading room regularly, and I insist on it no matter how busy I am at work." 4. This question examines the demonstration method. There are generally four kinds of argumentation methods: example argumentation, reason argumentation, contrast argumentation and metaphor argumentation, which are the most common in junior high school. The second paragraph of this question is a typical example demonstration, which is used to prove your argument with concrete and reliable examples. 5. This question examines the ability of information reporting. The "ladder" in the article is a metaphor, just find its ontology. The article refers to "predecessors' thoughts, predecessors' ideas and conclusions". The formation of one's own thoughts depends on "long-term preparation and temporary emergence of thoughts", and "the key is to be a conscientious person and pay attention to breadth and depth when accumulating knowledge". This is an open question, which can be considered from many angles. For example, we should develop the habit of consulting the latest information regularly; Have one's own opinions; Organize information from your own point of view and use it for me; Be a man with a conscience and so on.
(3) Charm
Charm is the attraction to people. People like reading articles because they are attractive. When people are attractive, others want to be close to and associate with them.
There are three levels of human charm.
One is the charm of appearance and appearance. People are beautiful and well dressed, so others like to take a look and walk in the street. Some people want to get closer or have a high "turn around" rate. Beauty is not completely equal to beauty, and its connotation is richer. Some people are beautiful, wearing heavy makeup and colorful clothes. They are not necessarily beautiful, but they always feel that they have almost everything. What's the difference in manners? Grace can't dress up
The second is personality charm and moral cultivation. Some people are not beautiful, not necessarily powerful, not necessarily writing books, but others love to get close to him, ask him for knowledge and ask him for help. He is not necessarily obvious, flattering and netting, but he is cohesive. The reason is his personality and the charm of his moral cultivation. The first essence of a person is sincerity. This is beyond the understanding and reach of all those who cheat, make trouble and play politics.
The third is the charm of thought. Some people live to enjoy, while others live to think. Of course, he has to eat and dress when he is alive. All practice and all activities are the material of his thinking. He is constantly thinking, and his thoughts are sometimes as fleeting as the spark of calcium carbide. He tried to catch them in case they slipped away. An idea, like a sword, can cut through chaos, open it, and even illuminate the night. It is home that can form a system. Thinkers are not gods and make mistakes. A thinker who has made mistakes is still a thinker, and his thoughts are stored in his works and speeches, which are still the spiritual wealth of the world. The charm of thought is the highest level of charm of human beings. Above the charm of personality and moral cultivation, even above the charm of appearance and appearance. It is not only attractive, cohesive and influential. Generally speaking, so-and-so has a brain, which generally means that he has a mind. Be a thoughtful person! Generally speaking, the times call for thinkers!
1. What are the three levels of human charm?
2. What is the central point of this article?
3. The article mainly adopts the argument method of _ _ _ _ _ _ _.
There is a saying that "people are beautiful because they are cute". What's your new understanding of this sentence after reading this article?
5. What do you think of your charm? How are you going to make yourself more attractive?
6. Please write a sentence according to the following example.
For example, an idea, like a sword, can cut through chaos, open chaos, and even illuminate the night.
Reference answer:
1. One is the charm of appearance, the other is the charm of personality and moral cultivation, and the third is the charm of thought. 2. The charm of thoughts is the highest charm of people. 3. Comparative argument 4. This sentence is consistent with the viewpoint of this article, and it also shows the relationship between the various levels of charm. This sentence reminds us not to pay too much attention to the charm of appearance, but to strengthen the cultivation of inner character. It makes sense. This is an open test, as long as you can talk about it according to your own situation and your own understanding of the essay, express your pursuit of charm and have your own opinions. 6. For example, a smile is like a spring breeze, which can blow away indifference, bring warmth and even light up a person's heart. The sentence pattern meets the requirements, the content is reasonable, and the sentence is fluent. )
What is the hardest thing in life? Poor? No; Frustrated? No; Old? Dead? Neither. I said that the hardest thing in life is not to take on a future responsibility. If people can be satisfied, they are poor and not bitter; If you can be quiet (don't make extra hopes), although frustrated, it is not bitter; Birth, illness, death and illness are inevitable things in life. For a philosophical person, suffering is nothing at all. Solitude is something that people will do one day in the world; If you don't finish what you should do, it's like having thousands of pounds on your shoulders. No matter how difficult it is, why? Because conscience blames you, but there is nowhere to run.
You didn't do what you promised, you didn't pay back the money you owed, you didn't pay back the favor you received, the person you offended didn't give a gift, and you didn't even dare to meet this person. Even though I can't see his face, it seems that his shadow haunts me in my sleep. Why? Because I feel sorry for him, because my responsibility to him has not been lifted. This is true not only for one person, but also for family, society, country and even for oneself. I am responsible for anyone who belongs to me and benefits from him. I have the responsibility to do whatever I should do and what I can do. No matter what I decide to do, I will make a contract between myself now and myself in the future, which is a layer of responsibility for myself. With this responsibility, conscience will always supervise. If you don't do your duty for a day, you will have a miserable night. If you don't do your duty in this life, you will die painfully in the grave. But this kind of pain is not comparable to ordinary poverty, illness and old age, and can be solved in a philosophical way. So I said, there is no pain in life; If there is pain, of course, there is nothing heavier than this.
What do you enjoy most? The end of natural responsibility is the first pleasure of life. As the old saying goes, "liberation"; As the saying goes, "a stone fell to the ground." Words cannot describe how relaxed and happy people are at this time. The greater the responsibility, the longer the days of responsibility. After the responsibility is over, you will have a wide vision and feel at ease, and that kind of happiness will multiply. Generally speaking, what happens in the world and the happiness gained from suffering are the real happiness. Only by knowing the bitterness of responsibility can we know the joy of doing our duty. This cycle of bitterness and joy is an interest in this dynamic world. However, I am not responsible, and I am condemned by my conscience. These hardships are all found by themselves. Once you turn it over and do your duty everywhere, you will be happy everywhere; Always do your duty and you will be happy forever. The right to be happy is in your own hands. This is why Confucius said, "There is no progress without complacency".
……
Some people say, "since this suffering is born of responsibility, if I shirk my responsibility, won't there be suffering forever?" That was not the case. There is no responsibility for lifting it, and there is no responsibility for not lifting it. If life can always be like a child of two or three years old, there will be no pain without responsibility. When you grow up, the responsibility will naturally fall on you. How can you hide? But there is a difference in size. Do a great responsibility; You are so happy; Do a little responsibility, and you will get a little happiness. If you want to hide, you throw yourself into the ocean of pain and you will never get rid of it.
1. Fill in the blanks with the original text.
In the author's pen, you are poor but not bitter because you are frustrated but not bitter, and you are old, sick and dead because. The author thinks that the real pain comes from.
Please find a sentence from the last paragraph that accords with the meaning of "the right to happiness is in your own hands".
3. What do you think is the difference between the "unloading" responsibility and the "unloading" responsibility mentioned at the end of the article?
① The meaning of "shirking" responsibility is (within 10)
(2) "release" responsibility means (within 10)
Summarize the central point of this article in concise language. (within 10)
The title of this article is "the most bitter and joyful", not "bitter and joyful". Why?
6. After reading the whole article, what do you think of "responsibility"?
Analysis: This article talks about the responsibility of life from what is bitterness and what is pleasure. Strictly speaking, everyone has his due responsibility except two or three-year-old children. It warns us that in life, we must do our due duty to our family, society, country and ourselves, so that we can be truly happy. Judging from the topic setting, 1 focuses on careful reading of the original text, and the first three are looking for answers in the first paragraph. Look for the answer at the end of the second paragraph. Question 2 focuses on understanding and taking care of the content of the full text. The third problem is the understanding of the meaning of words in the text. The meaning of words is not fixed and rigid, and they often have their own unique explanations in articles and in the language environment of life. Only by reading the original text carefully can you answer the question correctly. The fourth question focuses on the induction of the theme, which requires a good grasp of the full text and a general exposition of the center. The fifth question is the reflection on the title of the article, paying special attention to the subtle spirit. Question 6 is an open question, which leads each of us to think deeply: What is your responsibility? How will you perform your duties? Answer: 1. Content; Quiet; Be philosophical; I didn't do my duty. 2. You will be happy if you make a great responsibility; Do a little responsibility, and you will get a little happiness. 3.( 1) Failing to do his duty and leaving it behind; (2) due diligence, no burden. Everyone must do his duty. 5. This paper talks about the truth that "people should do their duty" from two aspects: "the most bitter" and "the most happy", and "bitter happiness" has little to do with the main content of this paper's "talking about responsibility". 6. There are three main answers: ① Everyone has a responsibility; Doing our duty is the whole content of our life; Do your duty, you will be happy, otherwise, you will fall into pain.
Read the article and complete the following questions:
(1) What is first-class knowledge? Cheng Yi, a philosopher in the Northern Song Dynasty, said: "It is first-class knowledge to be willing to think of others when things are going wrong." This simple language not only popularly expresses profound philosophy, but also points out the first element of being a man.
Willing to think of others is not only a kind of fraternity, but also a realm. Those utilitarians, secular people and ordinary people can't do it. Only those who are extraordinary, kind-hearted, selfless and dedicated to the benefit of others like Bethune and Jiao He can truly master the first-class knowledge mentioned by Cheng Yi.
40 kilometers west of Taiyuan City, Shanxi Province, there is a hanging mountain. Among the towering ancient trees at the foot of the mountain, there are more than 100 temples, pavilions and bridges. A long history of cultural relics and beautiful natural scenery blend together, which is the famous Jinci.
The beauty of Jinci lies in mountains, trees and water.
The mountains here, towering into the sky, like a barrier; Dragons, like two outstretched arms, hold Jinci in their arms. In spring, the mountains are covered with yellow flowers and the paths are fragrant; Qiu Lai has sparse vegetation and clear sky. Whenever you climb a mountain, you will feel relaxed and happy.
The trees here are famous for their ancient vitality. There are two old trees: one is Bai Zhou, and the other is Tang Huai. Sabina vulgaris with straight trunk and cracked bark lies on the stone steps, with several green branches on the top. That Tang Huai is old and thick, with winding branches, clusters of soft strips and green leaves. There are pines, cypresses and willows by the water outside the temple, all of which show vigorous character. Some are famous for their strange shapes, some are like old women holding water, some are quite like strong men holding heaven, and so on. The twisted cypress tree on the left in front of Notre Dame is towering into the sky, and the texture on its bark is twisted to the left, round and round, like smoke hovering underground and like a rope hanging from the sky. Under the protection of ancient trees, Jinci Temple is particularly quiet and elegant.
The water here is rich, clear, quiet and soft. Walking in the garden, I saw a deep pool here and a small canal there. There is a river under the bridge, a well in the pavilion and a stream by the road. Between the stones, there are fine veins, such as lines and wisps; The blue waves in the forest shine like brocade. This water comes from the "Difficult Old Spring". There is a pavilion on the spring, and the word "Difficult Old Spring" inscribed by Fu Shan, a famous scholar in Qing Dynasty, hangs on the pavilion. So much water keeps flowing and tinkling day and night. The clarity of the water is really amazing. No matter how deep the water is, fish and gravel can be seen clearly as long as the light is good. The flowing potential of water is not great. The clear microwave pulled the long grass vines into wisps, spread them on the bottom of the river and hung them on the shore. Together with the reflections of goldfish, moss and stone fences, they are woven into big banners, which wear pavilions and go around pavilions, and Ran Ran is endless. When Li Bai came here, he once praised: "Jinci runs like a jasper." When you look at the pavilions by the running water, you may ask: these hundreds of buildings are probably floating on the water!
However, the most beautiful is the ancient culture left by our ancestors. There are three wonders of ancient architecture in China.
One is Notre Dame Hall. Founded in Song Tiansheng and rebuilt in Song Chongning (1 102), it is the main hall of the whole temple. There is a veranda outside the hall, which is the earliest existing palace with veranda in ancient buildings in China. The temple is seven rooms wide and six rooms deep, which is extremely spacious, but there is not a pillar. Originally, the roof truss was supported by wooden columns on the cloister outside the wall. The columns were slightly inclined inward and the four corners were higher, forming cornices. The yellow-green glazed tiles on the roof alternate with each other, and the flying pavilion flows from a distance, which is very majestic. The clay sculptures of the Virgin of the Song Dynasty, 3 1 handmaid and 4 female officials in the temple are the treasures of the existing clay sculptures of the Song Dynasty in China. Maids dress up, sweep the floor, play music, or sing and dance, with different shapes, plump and handsome figures, delicate and round faces, vivid eyes and smooth lines, which is really wonderful.
The second is the carved dragon on the front pillar of the temple. This is the earliest existing Panlong carved column in China, carved in the second year of Song Yuanyou (1087). Eight dragons, each holding a big column, glared at each other, and their whole bodies came out of the clouds, which made them angry. Although it is nearly a thousand years ago, the scales must have beards, and they seem to be still flying. People can't help but admire its fine wood and exquisite craftsmanship.
The third is the whole marsh flying beam in front of the temple. This is a square lotus pond. A cross-shaped flying beam was set up on the swamp, supported by 34 octagonal stone pillars. The railings and sentry boxes beside the bridge have strange shapes and can be left and right at will on the footbridge. This kind of cross flying beam that breaks through a straight line is also rare in ancient buildings in China.
Notre Dame Cathedral, memorial archway, bell and drum tower, golden platform and water mirror platform are the main buildings. , are simple and beautiful, exquisite workmanship. In addition to this group of buildings, there are Chaoyang Cave, Santaige, Guandi Temple, Wenchang Palace, Jellyfish Building, El Nino Building, Jingqing Gate, etc., all of which are surrounded by mountains and waters, or built on the blue waves, or hidden in the shade of trees, with different tastes.
Many sketches in the garden are also very ingenious. For example, there is a rockery. A stream of Koizumi hung down from the mountain, and there stood a young monk carved out of white marble, with bare forehead, smiling eyes, hand in hand, holding a stone bowl to catch water. Water poured into the bowl and splashed into the pool at the foot, but the bowl was not filled. Another example is a carved tiger beside a clean stream, with its two front paws grasping the stones at the water's edge, leading its neck and waist, and its lips just submerged in the water, as if to suck the river dry. Scholars of all ages loved Jinci, a good place. There are many famous poems, beautiful words and exquisite calligraphy on the stone wall beside the mountain road and the stone tablet in the hall corridor, which add a lot of charm to the lakes and mountains.
Jinci Temple is really a pearl among the splendid rivers and mountains in China.
1. Summarize the general characteristics of Jinci with one sentence in the article.
A: Yes.
2. Regarding the structural features of this article, the following options are correct.
A, general formula b, general formula c, general formula d and parallel formula
This article is an expository one, but there are many vivid descriptions, arguments and lyricism. Please find an example to fill in the following lines.
A: Description:
Discussion:
Lyrics:
4. What kind of explanation order was used to write the paragraph of Notre Dame? Is from explanation to explanation. The order of paragraph description in Essays in the Garden is: from description to description.
5. It will "rotate on the ground like a smoke." How about changing the word "rotating" to "rolling"? Please provide a justification for the answer.
A:
6. How did the author write about the water in Jinci? Please analyze it briefly.
A:
7. In order to explain Jinci accurately and clearly, the author used various methods to explain it. Please talk about the benefits of this explanation method with examples from the content of the article.
A:
Reference answers for "actual combat drills":
1, a long history and culture are integrated with beautiful natural scenery. 2, C 3, omitted 4. spatial order from the outside to the inside.
The logical order is from generalization to concreteness. 5. Not good. Because the word "spin" vividly shows the appearance of "twist to the left, round and round". The word "volume" cannot produce such an effect. 6. Using metaphor, parallelism and antithesis, the author vividly described the four characteristics of Jinci water in beautiful language: thick, clear, quiet and soft. 7. Omit.
(6) Radon: Invisible Killer
Nowadays, cancer is the main cause of death among urban residents. As the main type of cancer, lung cancer is one of the cancers with the highest mortality. After long-term statistical analysis and animal experimental research, people have realized that the occurrence of lung cancer is the result of the comprehensive action of many factors. In China, a recent survey shows that there are more than 50,000 cases of lung cancer caused by radon every year. Radon has become the second leading cause of lung cancer in China besides smoking. In the United States, the director of health also warned that radon is the second leading cause of lung cancer, which is estimated to cause 14000 deaths every year. Medical research has confirmed that radon can not only cause lung cancer, but also cause leukemia, infertility, fetal malformation and genetic variation.
Scientists tell us that radon is the only natural radioactive gas produced by the decay of radionuclide radium, which is colorless and tasteless. The decay products of radon are called radon daughters. At room temperature, radon and its daughters form radioactive aerosols (dust containing these substances) in the air, causing air pollution. Radon inhaled by people is easily intercepted by the respiratory system and accumulates in some areas. Radon can decay into a variety of radionuclides, and continuously release rays, such as A and B. These rays constantly bombard lung cells, causing lung cells to be damaged, thus causing diseases such as lung cancer.
③ The sources of indoor radon mainly include the following aspects: First, radon separated from foundation soil. The concentration of radon in soil and rock containing uranium and radium deep in the stratum is very high. When a building is built on it, radon will spread indoors along the cracks in the ground. The second is radon separated from building materials. 1982 The report of the United Nations Scientific Committee on the Effects of Atomic Radiation points out that building materials are the main source of indoor radon. Such as granite, marble, ceramic tile, red brick, blue brick, ceramic sanitary ware, cement, etc. , all contain radon and radioactive substances, especially natural stones containing radioactive substances are easy to release radon. The third type is radon that enters the room from the outside. In outdoor air, radon is diluted to a very low concentration, which does not pose a threat to human body. But after entering the room, if the ventilation is not smooth, it will accumulate indoors. Fourthly, when the radon content in water and natural gas is high, radon can also be released from the water supply and gas supply system.
After we have a general understanding of the harm of radon, we will naturally think of how to eliminate radon. In fact, because the harm of radon has no threshold, it is natural and ubiquitous, and it is theoretically impossible to completely eliminate its harm. We can only reduce its harm. Reducing the harm of radon is actually reducing the concentration of radon. The outdoor radon concentration has been diluted to a very low level by the atmosphere, which will not cause obvious harm to people. If indoor radon concentration can be reduced to a very low level, its harm can be ignored. 1996 the indoor radon concentration control standard issued by China stipulates that the radon concentration control standard in new houses is 100 baker per cubic meter of air. If indoor radon agricultural degree is within the national control standard, it will not cause medical damage to human health.
⑤ The most effective measure to reduce indoor radon concentration is to eliminate radon sources. Ideologically, it is very important to strengthen the awareness of reducing radon pollution. In action, when selecting the foundation before building, if possible, please ask the relevant departments to detect radon first, and then take radon reduction measures. When choosing building materials and room decoration, all gaps between the ground and the wall should be filled and sealed, especially in the basement and the first floor and rooms with high radon content, which can effectively reduce radon precipitation. Always keep the indoor air fresh, do a good job of ventilation and reduce indoor radon.