英語作文(經(jīng)典5篇)

　　在日常的學(xué)習(xí)、工作、生活中，大家都嘗試過寫作文吧，借助作文可以提高我們的語言組織能力。相信許多人會覺得作文很難寫吧，以下是小編為大家收集的英語作文5篇，歡迎大家分享。

英語作文 篇1

　　Gym Class

　　Out of all my classes, I particularly like gym class. Why? Because in gym class you can have fun and get out in the fresh air. We play baseball, basketball, football and practice running. It＇s fun. When you are defeated, you can＇t lose hope because failure is the mother of success. And when you are victorious, you will be happy. I like gym class. I really like it.

英語作文 篇2

　　Passage Five

　　A balanced diet is one that provides an adequate intake of energy and nutrients for maintenance of the body and therefore good health. A diet can easily be adequate for normal bodily functioning, yet may not be a balanced diet.

　　Carbohydrates

　　Carbohydrates are a rapid source of energy, they are the body’s fuel. The bulk of a balanced diet should be made from carbohydrates. If eaten in an excess of the dietary requirements carbohydrates are easily stored as fats in the cells, although carbohydrate is the first source of energy in the body.

　　An average adult requires about 12,000kJ of energy a day, most of this is supplied by the respiration of carbohydrates in the cells.

　　Carbohydrates are used principally as a respiratory substrates, i.e. to be oxidised to release energy for active transport, macromolecule synthesis, cell division and muscle contraction. Carbohydrates are digested in the duodenum and ileum and absorbed as glucose into cells. Sources of carbohydrates such as starch are rice, potatoes, wheat and other cereals. Sugars are also carbohydrates, sources of sugars are refined sugar - sucrose, which is a food sweetener and preservative and fruit sugars - fructose. If the diet lacks carbohydrate stores of fat are mobilised and used as an energy source.

　　Proteins

　　Protein is not a direct source of energy in the body, it is used primarily for growth and repair of body tissues while remaining an energy source as a last resort. Proteins fulfill a wide variety of roles in the body. They are broken down in the stomach and intestines to amino acids which are then absorbed. The body can only form 8 amino acids to build proteins from, the diet must provide Essential Amino Acids (EAAs) which are synthesised into proteins which can be structural, i.e. collagen in bone, keratin in hair, myosin and actin in muscle; metabolic enzymes, hemoglobin, protective antibodies and communicative hormones.

　　Sources of protein include meat, fish, eggs and pulses. The diet needs to provide 8 EAAs as the body is unable to synthesis proteins without these molecules. 2 other amino acids are synthesised from EAAs so if the diet lacks the original EAAs these other two will not be present either. Phenylalanine is converted to tyrosine and methionine is converted to cysteine. Cells draw upon a pool of amino acids for protein synthesis which either come from dietary protein digested and absorbed in the gut and the breakdown of body protein such as muscle. However, unlike fats and carbohydrates there is no store of amino acids for cells to draw on, any amino acid in excess of immediate bodily requirements is broken down into urea and excreted. It is therefore important to maintain the dietary intake of protein everyday. If the body lacks protein, muscle wasting occurs as muscle is broken down.

　　If protein is lacked in a diet a person develops kwashiorkor which is caused when high levels of carbohydrates are eaten to overcome the lack of protein in the diet. One symptom of kwashiorkor is the abnormal collection of fluid around the abdomen due to the lack of protein in the blood. The body cannot retain water by osmosis and fluid accumulates in tissues causing them to become waterlogged.

　　Vitamins

　　Vitamins cannot be synthesised by the body so must be supplied by diet. Vitamins have no common structure or function but are essential in small amounts for the body to be able to utilise other dietary components efficiently.

　　Vitamins fall into two categories, fat soluble vitamins such as vitamin A, D, E and K which are ingested with fatty foods and water soluble vitamins such as the B group vitamins and vitamin C. Vitamins are known as micronutrients because only small quantities are required for a healthy diet, in fact fat soluble vitamins can be toxic in high concentrations, for example the body stores vitamin A, or retinol, in the liver as it is toxic if kept in high concentrations in the blood stream, a dose of more than 3300mg of vitamin A can be considered toxic. Water soluble vitamins such as vitamin C and B groups vitamins can be excreted in the urine if in excess in the diet.

　　Vitamins carry out a wide range of functions and prevent specific deficiency diseases. A diet that lacks a certain vitamin is not a balanced diet, vitamins have vital roles in the maintenance of a healthy body.

　　An example of a deficiency is when the diet does not contain enough, or any vitamin A. Vitamin A is found in some animal foods such as milk, eggs, liver and fish liver oils, related compounds such as carotenoids e.g. b carotene, are in a wide variety of vegetables such as cabbages, carrots and spinach.

　　Vitamin A is essential to the proper functioning of the retina in the eye and the epithelial tissues. A lack of vitamin A results in dry, rough skin, inflammation of the eyes, a drying or scarring of the cornea - xerophthalmia, which occurs when the secretion of lubricating tears is stopped, the eyelids become swollen and sticky with pus. Mucous surfaces of the eye may become eroded allowing infection to set in, leading to ulceration and destruction of the cornea. Night blindness - an inability to see in dim light can also occur. Rod cells in the retina of the eye detect light of low intensity, they convert vitamin A into a pigment, rhodopsin, which is bleached when light enters the eye. Rod cells resynthesis rhodopsin, but if there is a deficiency of the vitamin, rod cells can no longer function and the result is night blindness. Epithelial cells use retinol to make retinoic acid, an intracellular messenger used in cell differentiation and growth. Without retinoic acid epithelial cells are not maintained properly and the body becomes susceptible to infections, particularly measles and infections of the respiratory system and gut.

　　Xenophthalmia is common among children who’s diets consist of mainly cereals with little meat or fresh vegetables, this is common in Indonesia, Bangladesh, India and the Philippines.

　　Vitamin D, or calciferol, is another fat soluble steroid vitamin which functions to stimulate calcium uptake from the gut and its deposition in bone. vitamin D acts as a hormone when converted by enzymes in the gut and liver into an active form of "active vitamin D", which stimulates epithelial cells in the intestine to absorb calcium. vitamin D is therefore essential in growing children’s diets to enable the growth of strong bones. Without adequate amounts of vitamin D children can develop rickets, which is the deformation of the legs caused when they lack calcium to strengthen the bones. In adults a lack of vitamin D in the diet can lead to osteomalacia, a progressive softening of the bones which can make them highly susceptible to fracture.

　　Vitamin D is made by the body when exposed to sunlight and is stored in the muscles, however, if the skin is rarely exposed to the sunlight or is dark little vitamin D is produced. Foods such as eggs and oily fish are all rich in vitamin D.

　　Vitamin K, phylloquinone, is found in dark green leafy vegetables such as spinach and kale. It is a fat soluble vitamin which is involved in the clotting process of blood. In the intestines bacteria synthesize a number of important clotting factors which need vitamin K. Without vitamin K cuts can fail to heal and internal bleeding can occur.

　　Vitamin C is a water soluble vitamin, known chemically as ascorbic acid. It is found in citrus fruits such as oranges and lemons, and also in potatoes and tomatoes. The main function of vitamin C is the formation of connective tissues such as collagen. It is also known to be an antioxidant which helps to remove toxins and aids the immune system. A lack of vitamin C leads to Scurvy, a condition experienced by sailors on long journeys when they did not have fruit in their diets. Scurvy causes painful, bleeding gums. As vitamin C is water soluble, it is not toxic in high doses as it can be excreted in the urine, very high doses can however cause diarrhea.

　　B group vitamins have a wide range of roles acting as co-enzymes in metabolic pathways. They are found in most plant and animal tissues involved in metabolism, therefore foods such as liver, yeast and dairy products are all rich in B group vitamins. Deficiency of B group vitamins include dermatitis, fatigue and malformation of red blood cells.

　　1. When we have too much of carbohydrates, they are most likely be stored as sugar units.

　　2. In the process of digestion, carbohydrates are finally turned into cells.

　　3. The Essential Amino Acids which build part of proteins can be formed by human body.

　　4. The ultimate cause of kwashiorkor is lack of protein, rather than lack of carbohydrates.

　　5. There are generally two different kinds of vitamins, they are __________________________.

　　6. Night blindness is a disease normally caused by lack of _____________.

　　7. One of the main function of vitamin D is to prevent adults from ________________.

　　8. Although the human body produces vitamin D normally, it fails to do so if there is not enough ______________.
9. The reason why vitamin C is seen as an antioxidant is that it drives ___________ out of the body.

　　10. If you are in lack of B group vitamins, you should turn to ________________________.

　　當(dāng)看完這篇六級英語作文，昨晚這篇閱讀的時候我才發(fā)覺自己被耍了�。。。。。�！因為題目簡單的`要命，但是文章很長，令我難受的一篇英語六級作文，英語四六級作文《令我難受的一篇英語六級作文》。不過之所以這么難受也是我做題策略出現(xiàn)問題。本質(zhì)來說這篇文章條例很清晰，結(jié)構(gòu)很嚴(yán)謹(jǐn)，但由于我第一次看這種文章所以一開始就蒙了，一開始就承受了很大的心理壓力，越看越煩躁，越看越郁悶，但好在我硬是把這篇文章給看完了，看來還是要多看不同類型的文章，找出做題的規(guī)律才行。

　　像這種文章，應(yīng)該先看體后看文章才對，不能像我那樣拼死去看，后果真是慘不忍睹，及浪費了時間有給自己帶來了很大的壓力，看來以后還是得繼續(xù)練習(xí)才行！加油！

英語作文 篇3

　　Chinese New Year is the longest and most important celebration in the Chinese calendar. Chinese months are reckoned by the lunar calendar, with each month beginning on the darkest day. New Year festivities traditionally start on the first day of the month and continue until the fifteenth, when the moon is brightest. In China, people may take weeks of holiday from work to prepare for and celebrate the New Year.

　　中國春節(jié)：

　　中國最重要的節(jié)日是春節(jié),亦稱中國新年。對中國人民來說它的重要性就如方圣誕節(jié)對于西方人民。這個一年一次的節(jié)日日期取決于陰歷而不是格里歷，因此假日的時間變化從一月下旬到上旬2月。對普通的中國人，節(jié)日總是在除夕夜開始,結(jié)束于陰歷的第一個月的'第五天。 但1第一個月的15號，通常稱燈會，在國家的大部分地區(qū)意味春節(jié)的正式結(jié)尾。

英語作文 篇4

　　【提要】中考英語作文英語信息 : 20xx年中考英語作文常見話題之保護(hù)環(huán)境

　　Sample ： Pollution around us(保護(hù)環(huán)境)

　　In recent years our life is becoming better and better.

　　But our environment is becoming worse and worse. It’s very bad for our life. Now many people have air-conditioners and cars, they produce (give off ) waste gas. More and more trees are being cut down. There are so much sand on the earth (leaving only sand ) . We often see factories pour waste into rivers or lakes. Water in the river is quite dirty. We haven’t enough clean water to drink in cities. Now we are in danger. It’s very necessary and important to protect the environment well.

　　I think if everyone tries his best to protect the environment, the world will become much more beautiful , and our life will be better and better .

英語作文 篇5

　　I have studied English since three ears ag. On wa t learning English, I have se was t shw u.

　　First, we can cp the new wrds again and again in rder t reeber the wrds. Secnd, we shuld read as uch as pssible. Be sure t chse tpics r bs u are interested in. Third, we can tal with friends and teachers as ften as pssible s that we will iprve ur speaing sills. Last, we shuld eep an English diar t iprve ur writing sills.

　　I hpe I can help u. I hpe was are useful fr u.

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