30 [Label: Modern Literature Reading, Modern Literature, Extracurricular] Dalian University of Technology Press, ... from page 4 1, that is 1-7, type all the answers, please add the question 2008-10-0417:/kloc.
Since my father didn't write. Thank you. Please answer anonymously: 2 popularity: 2 solution time: 2008- 10-05 17:58.
The present situation of marine pollution is that there are many pollution sources, a wide range of pollution and a serious degree. Marine pollution mainly includes oil pollution, red tide, poison pollution, plastic waste and nuclear pollution. At present, marine pollution is serious. As far as sea areas are concerned, there are Baltic Sea, Mediterranean Sea, Tokyo Bay, new york Bay of the United States, Gulf of Mexico and so on. As far as countries are concerned, there are Japan, the United States and western European countries. Pollution in Bohai Sea, Yellow Sea, East China Sea and South China Sea in China is also quite serious. Although the concentrations of mercury, copper and lead are generally within the allowable range of standards, some areas have exceeded the prescribed standards. The most serious one is the Bohai Sea, where some fish stocks died and the fishing grounds moved out. Some beach farms were abandoned; Some precious marine resources are disappearing. How does marine pollution destroy the seawater environment? The turbidity of seawater caused by marine pollution seriously affects the photosynthesis of marine plants, thus affecting the productivity of water bodies and endangering fish, heavy metals and toxic organic compounds. Through the enrichment of marine life, it accumulates and poisons other animals and even humans in this sea area; Oil pollution forms a huge oil film on the ocean surface, which prevents oxygen in the air from dissolving in seawater. When oil decomposes, it will consume dissolved oxygen in the water, resulting in hypoxia in seawater and endangering marine life. Organic pollution will make seawater eutrophic, make algae multiply abnormally, cause red tide flooding and destroy ecological balance. Now, marine pollution has attracted more and more attention from the international community. The summary of this paper's explanation center is to find out the key sentence that best reflects the characteristics of the explanation object, that is, "How does marine pollution destroy the seawater environment?" , extract the center we want to summarize; "How marine pollution destroys the seawater environment" or "How marine pollution destroys the seawater environment". The center of the summary statement can start with the title. Some topics summarize the center of the article and reflect the main content of the article. For example, "Seeing the weather from the clouds", as can be seen from the title, this article introduces the relationship between clouds and weather. The center of summarizing and explaining the text can also be understood from the writing intention. For example, in the article "Wonderful Cloning", in order to clearly explain what cloning is, the author carefully organized the materials, divided them into four subheadings, and clearly and easily introduced what cloning is, the development of cloning technology, the birth of Dolly the Sheep, and how cloning technology benefits mankind. Summing up the center of the exposition, we should also pay attention to analyzing the characteristics and essence of things and things. For example, the article "Biological Invaders" mainly explains to us what biological invasion is, as well as the causes and harm of biological invasion. This paper first explains what a "biological invader" is, reveals its essential characteristics, and then explains the causes and harms of biological invasion in detail, first enumerates examples (phenomena), and then analyzes the causes and consequences. If we can analyze the characteristics of the object and the essence of the related content, the central problem will be solved. The center of summarizing the explanatory text can also be analyzed from the process of explanation. For example, in the article Lop Nur, the Lost Fairy Lake, the author introduces the past of Lop Nur, compares it with the present, and writes the disappearance of Lop Nur with detailed data, thus revealing the tragic reason why Lop Nur has changed from Fairy Lake to desert-human greedy and blind demand for nature. 2. Reading the explanatory text should also pay attention to the generalization of the explanatory content. The summary of the content of explanatory paragraphs can be carried out from the following two aspects: first, determine the central sentence; The second is to clarify the relationship between sentences in paragraphs, summarize the meaning of paragraphs, and synthesize the meaning of paragraphs. For example, in the article "Suzhou Gardens", "Planting trees and pruning in Suzhou Gardens" also focuses on painting. ..... When the flowers bloom, they are full of jewels, which makes tourists feel infinite prosperity and joy, but they can't say it. The central sentence is clear, so the meaning of this paragraph is clear. Its central sentence is the first sentence of this paragraph. Another example is the article "Language of Nature", "Phenology is a science close to ecology in biology and agrometeorology in meteorology. In order to promote the development of agriculture in mountainous areas, it is necessary to carry out phenological observation in mountainous areas. After careful reading, we can find that the four meanings of "first", "right", "usable" and "usable" are arranged in the logical order from main to secondary and from heavy to light, which highlights the importance of phenology to agriculture in four aspects, such as the following questions: Read the following article and summarize the contents of the explanation. (1) When a certain external force is applied to the gas, it will flow like water and form an airflow. When we blow into our hands, we can feel the existence of airflow. (2) When the airflow is small, you can blow out matches and candles; A larger, very strong airflow that can blow a balloon or inflate a bicycle tire is usually used to clean grease on a machine or dirt on cotton cloth. Sometimes, people compress air and store it in air tanks or gas tanks. When the valve is opened, the compressed gas will expand rapidly, forming a powerful airflow. This kind of compressed air is often used to spray and clean buildings. ③ In the era of the development of modern science and technology, the application of airflow is full of magical colors. In the early 1980s, German and German scientists first proposed and realized the utilization of airflow to generate electricity. The structure of this airflow power station is very strange. It looks like a tall and thick chimney. The chimney has a diameter of10m and a height of 200m, and can be used for inhaling air, so that the hot air can be discharged quickly. Around the chimney is a huge circular arc transparent plastic shed. The connecting part between the greenhouse and the chimney is about 8m high, the edge is 2m high, and the Fiona Fang is 252m2. The generator is installed at the bottom of the chimney. Due to the transparency and thermal insulation of plastics, the air in the greenhouse will gradually heat up after being irradiated by the sun, making the temperature in the greenhouse about 200c higher than that outside the greenhouse. Using the characteristics of air temperature rising and cooling, and the rapid exhaust of tall chimneys, hot air can pass through the generator at the bottom of the chimney at a speed of 20 ~ 60 meters per second to drive the generator to work. With this power generation device, this power station can generate electricity during the day100 MW; At night, 40 kilowatts of electricity can be generated by using waste heat. It is estimated that the cost of power generation is similar to that of nuclear power plants, and it is economical to use. (4) The United States developed a waterless air swimming pool by using the action of airflow. In a circular room with a diameter of 6 meters and a height of 7 meters, a large blower was installed to blow air to the top. Under the action of airflow, there will be upward tension in the room, which will make people float in the room, both like swimming in water and flying in the air. This environment can be used not only for physical exercise, but also for bionic flight science research, which opens up a new adaptive way for human survival. ⑤ Now some people are studying how to make air curtain roofs by the action of airflow. When the pouring rain falls on the sports ground, the high-pressure air nozzles installed around the stadium will spray a strong airflow into the sky and move the rain to other places. In this way, the stadium was transformed into a gymnasium. It's really interesting that people watch the game in the huge airflow and rain. The research object of this paper is airflow, and the function of airflow and its application in the era of modern science and technology development are expounded around this object. Can you think of a single training course on life and climate? For millions of years, the climate of the earth has been determined by the struggle between the animal kingdom and the plant kingdom, the two life kingdoms of the earth. Animals breathe in oxygen and exhale carbon dioxide, while plants mainly breathe in carbon dioxide and release oxygen. Carbon dioxide is a greenhouse gas, so it can be immediately concluded that animals can warm the earth and plants can cool it. If which side has the upper hand, then the earth will face the greenhouse effect or another severe cold period. During the "Cambrian Big Bang" more than 500 million years ago, arthropods released carbon dioxide into the air everywhere, which made the carbon dioxide content in the air 20 times higher than today, so the climate at that time was extremely warm. However, the plants fought back. Fossils show that plants containing lignin first appeared 450 million years ago. Lignin hardened cells, so plants could grow, and the first trees appeared on the earth. With the growth of a large number of plants around the world, unconstrained photosynthesis absorbs carbon dioxide from the air, which greatly reduces the content of carbon dioxide, but hungry arthropods who can't absorb lignin can do nothing about it-the earth has entered a cold period. Animals fight back through further evolution. The main characters are termites and dinosaurs. They learned how to eat lignin and how to prosper. Their heavy breathing and damage to plants have made the carbon dioxide in the air as high as three times that of today, and most parts of the earth are hot and humid, restoring the greenhouse effect. However, the plants were not destroyed. 65 million years ago, after dinosaurs disappeared completely because of asteroid collision or other disasters, plants seized this opportunity to fight back again, and the breakthrough point was the emergence of the first batch of grasslands. Grass itself does not store much carbon dioxide, but it can form soft soil and store a lot of carbon dioxide, thus reducing the carbon dioxide content in the air. In fact, grassland ecosystem contains more carbon dioxide than forest ecosystem. In the past 40 million years, a large number of grasslands have spread all over the world, replacing forest areas many years ago. Under the influence of grassland, the earth gradually cooled down and finally entered the ice age 2 million years ago. About 654.38 million years ago, due to the remarkable enhancement of human activities, the carbon dioxide content in the earth's air rose again. Especially in the last hundred years, the greenhouse effect of the earth has become more and more obvious. Perhaps, the whole biosphere on the earth is constantly adjusting the atmospheric environment of the earth, just as we know that biological individuals adjust their own internal environment to adapt the climate to the needs of life and evolution on the earth. In other words, the earth's biosphere actively adjusts the environment, not passively adapts to it. If so, billions of years of climate change is not only the cause of the sun or the earth, but also the deep participation of creatures for their own interests.