VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.Lack of Vitamin A affects the eye but not the whole body.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.Both Vitamin A and Vitamin B can be found in butter.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.Lack of Vitamin B can cause heart problem.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.Vitamin C is used by doctors to heal the diseases of nervous system.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.The body can make Vitamin D for itself if there is enough sunlight.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.Women usually need more Vitamin D than men.

VitaminsFood contains only small quantities of vitamins, but they are vital for good health. For example, if you eat a diet of meat, bread, sugar and fat, you may become ill with a disease called scurvy (坏血病). This is caused by a deficiency （缺乏） in vitamin C, which is found in fruit and vegetables.About fifty different vitamins have been identified, and a deficiency in many of these can lead to illness. Vitamin A is most important for good eyesight, but is also important for general good health. Liver contains a considerable amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, some fruits and vegetables,Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, wholemeal flour and vegetables. If a person has not enough vitamin B in his diet, this may affect his whole body, particularly the skin, the nervous system and the heart.Vitamin C prevents scurvy and helps to heal injuries. Some doctors believe that large quantities of vitamin C help people to avoid colds. Fruits and uncooked vegetables are rich in Vitamin C, but when they are overcooked, or left for a long time, they lose most of their vitamins.Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk. Vitamin D is the only vitamin which the body can make for itself, but it can only do this if there is sufficient sunlight. A lack of both sunlight and vitamin D can result in a disease called rickets (佝偻病) ， which causes bones to soften and to be deformed.Vitamins are only needed in very small quantities. A quantity sufficient for a whole life would weigh only a quarter of a kilogram. Vitamins can be manufactured and are sold as additions to our food, but a well-balanced diet will provide an adequate amount of vitamins.For a whole life, our body needs a large amount of vitamins.

Private Car in AmericaThe private automobile(私家车)has long played an important role in the United States. In fact, it has become a necessary and important part of the American way of life. In 1986, sixty-nine percent of American families owned at least one car, and thirty-eight percent had more than one. By giving workers rapid transportation, the automobile has freed them from having to live near their place of work. This has encouraged the growth of the cities, but it has also led to traffic problems.For farm families, the automobile is very helpful. It has made it possible for them to travel to town very often for business and for pleasure, and also to transport their children to distant schools. Family life has been affected(影响)in different ways. The car helps to keep families together when it is used for picnics outings, and other shared experiences. However, when teenage children have the use of the car, their parents can’t keep an eye on them. There is a great danger if the driver has been drinking alcohol or taking drugs, or showing off by speeding or breaking down traffic laws. Mothers of victims(受害者)of such accidents have formed an organization called MADD(Mothers Against Drunk Driving). These women want to prevent further tragedies(悲剧). They have worked to encourage the government to limit the youngest drinking age. Students have formed a similar organization SADD (Students Against Drunk Driving) and are spreading the same message among their friends.For many Americans, the automobile is a necessity. But for some, it is also a mark of social position and for young people, a sign of becoming an adult. Altogether, cars mean very much to American, even though they cause a lot of environmental problems to people.People in the United States start to have their private automobile recently.

Private Car in AmericaThe private automobile(私家车)has long played an important role in the United States. In fact, it has become a necessary and important part of the American way of life. In 1986, sixty-nine percent of American families owned at least one car, and thirty-eight percent had more than one. By giving workers rapid transportation, the automobile has freed them from having to live near their place of work. This has encouraged the growth of the cities, but it has also led to traffic problems.For farm families, the automobile is very helpful. It has made it possible for them to travel to town very often for business and for pleasure, and also to transport their children to distant schools. Family life has been affected(影响)in different ways. The car helps to keep families together when it is used for picnics outings, and other shared experiences. However, when teenage children have the use of the car, their parents can’t keep an eye on them. There is a great danger if the driver has been drinking alcohol or taking drugs, or showing off by speeding or breaking down traffic laws. Mothers of victims(受害者)of such accidents have formed an organization called MADD(Mothers Against Drunk Driving). These women want to prevent further tragedies(悲剧). They have worked to encourage the government to limit the youngest drinking age. Students have formed a similar organization SADD (Students Against Drunk Driving) and are spreading the same message among their friends.For many Americans, the automobile is a necessity. But for some, it is also a mark of social position and for young people, a sign of becoming an adult. Altogether, cars mean very much to American, even though they cause a lot of environmental problems to people.In 1986, thirty-eight percent of American families owned one car.

Private Car in AmericaThe private automobile(私家车)has long played an important role in the United States. In fact, it has become a necessary and important part of the American way of life. In 1986, sixty-nine percent of American families owned at least one car, and thirty-eight percent had more than one. By giving workers rapid transportation, the automobile has freed them from having to live near their place of work. This has encouraged the growth of the cities, but it has also led to traffic problems.For farm families, the automobile is very helpful. It has made it possible for them to travel to town very often for business and for pleasure, and also to transport their children to distant schools. Family life has been affected(影响)in different ways. The car helps to keep families together when it is used for picnics outings, and other shared experiences. However, when teenage children have the use of the car, their parents can’t keep an eye on them. There is a great danger if the driver has been drinking alcohol or taking drugs, or showing off by speeding or breaking down traffic laws. Mothers of victims(受害者)of such accidents have formed an organization called MADD(Mothers Against Drunk Driving). These women want to prevent further tragedies(悲剧). They have worked to encourage the government to limit the youngest drinking age. Students have formed a similar organization SADD (Students Against Drunk Driving) and are spreading the same message among their friends.For many Americans, the automobile is a necessity. But for some, it is also a mark of social position and for young people, a sign of becoming an adult. Altogether, cars mean very much to American, even though they cause a lot of environmental problems to people.For farm families, the cows and horses are more important for them.