Vitamins are another essential requirement for health. There are about florty, known vitamins, lint the most generally referred to are A, B, C, D and E. Deficiency of Vitamin A, foundin carrots, rose -hips (玫瑰果), liver, etc., is alleged to affect the vision and the skin and reduce resistance to infection. Vitamin C, present in nearly all fruit, particularly oranges and other citrus fruit (柑橘属水果), has come to be regarded as particularly effective in the preventipn of cold and low energy states.

A:According to the paragraph, the best source of Vitamin C is citrus fruit B:fruit in dark color C:carrots D:rose - hips.

Vitamins are another essential requirement for health. There are about forty known vitamins, but the most generally referred to are A, B, C, D and E. Deficiency of Vitamin A, found in carrots, rose -hips, liver, etc. , is alleged to affect the vision and the skin and reduce resistance to infection. Vitamin C, present in nearly all fruit, particularly oranges and other citrus fruit, has come to be regarded as particularly effective in the prevention of cold and low energy states.
What will probably happen to a person with Vitamin C deficiency according to the paragraph

A:He will be easily infected. B:He will have a poor vision. C:He will have smooth skin. D:He will catch cold ffequently.

The primary consideration in achieving a balanced diet is now how much or how little we eat, but what we eat. Basically we need carbohydrates, protein, fat, vitamins and minerals, together with regular but not excessive exercise.
Carbohydrates are found in foods such as bread, potatoes and sugar. They are excellent energy products, but if eaten to excess may be largely converted to fat and a reduction in the amount of carbohydrates or "starchy: foods is one of the obvious ways to reduce weight, since most of us eat too much of them anyway.
Protein, found in meat and cheese, is used for tissue building and in the developed countries most people eat about 110g daily, which is a good deal more than the recommended minimum of 70g a day. Animal fats, e. g. butter are also good sources of energy, but are sometimes held to caus increased cholesterol levels in the blood (which may lead to fatty deposits in the arteries) and are therefore best avoided by people suffering from certain forms of heart disease, vegetable fats being recommended as a substitue.
Vitamins are another essential requirement for health. There are about forty known vitamins, but the most generally referred to are A, B, C, D and E, Deficiency of Vitamin A, found in carrots, rose - hips, etc. , is alleged (据称) to affect the vision and the skin and reduce resistance to infection. Vitamin C, present in nearly all fruit, particularly oranges and other citrus fruit, has come to be regarded as particularly effective in the prevention of cold and low energy states.
Among the minerals we need, the most important are calcium, iron and iodinc (碘). Milk is one of the richest sources of calcium, which helps to build our bones and our teeth. Lack of iron in the blood produces anaemia anay children and others suffering from anaemic conditions are generally advised to increase their intake of iron, which: may be found in liver, lentils, molasses and dates among other foods.
Which of the following is the richest source ofcalcium

A:Oranges. B:Milk. C:Cheese. D:Carrots.

Vitamins are another essential requirement for health. There are about florty, known vitamins, lint the most generally referred to are A, B, C, D and E. Deficiency of Vitamin A, foundin carrots, rose -hips (玫瑰果), liver, etc., is alleged to affect the vision and the skin and reduce resistance to infection. Vitamin C, present in nearly all fruit, particularly oranges and other citrus fruit (柑橘属水果), has come to be regarded as particularly effective in the preventipn of cold and low energy states.
According to the paragraph, the best source of Vitamin C is

A:citrus fruit B:fruit in dark color C:carrots D:rose - hips.

Among all the malignancies, lung cancer is the biggest killer: more than 100,000 Americans a year die of the disease. Giving up smoking is one of obvious way to reduce the risk, but another answer may lie in the kitchen. According to a new report, even heavy smokers may be protected from developing lung cancer by a simple dietary measure: a daily portion of carrots, spinach or any other vegetable or fruit containing a form of vitamin A called carotene.
The finding, published in the British medical journal The Lancet, is part of a long-range investigation of diet and disease. Since 1957 a team of American researchers has monitored the dietary habits and medical histories of 2,000 middle-aged men employed by the Western Electric Co. in Chicago. Led by Dr. Richard Shelelle of Chicago’s Rush-Presbyterian, St. Luke’s Medical Center, the researchers recently began to sort out the links between the subjects’ dietary patterns and cancer. Other studies of animals and humans have suggested that vitamin A offers some protection against lung cancer. The correlation seemed logical, since vitamin A is essential for the growth of the epithelial (上皮的) tissue that lines the airways of the lungs.
Vegetables: But the earlier research did not distinguish between two different forms of the vitamin. "Preformed" vitamin A, known as retinol, is found mainly in liver and dairy products like milk, cheese, butter and eggs. But vitamin A is also made in the body from carotene, which is abundant in a variety of vegetables and fruits, including carrots, spinach, squash, tomatoes, sweet potatoes and apples.
In the Western Electric study, Shekelle and his colleagues found little correlation between the incidence of lung cancer and the consumption of foods containing preformed vitamin A, but when they examined the data on carotene intake, they discovered a significant relationship. Among the 488 men who had the lowest level of carotene consumption, there were. fourteen cases of lung cancer; in a group of the same size that ate the most carotene, only two cases developed. The apparent protective effect of carotene held up even for longtime smokers but to a lesser degree.
Further studies will be necessary before the link between lung cancer and carotene can be firmly established. In the meantime, researchers warn against taking large numbers of vitamin A pills, because the tablets contain a form of the chemical that can be extremely toxic in high doses. Instead, they advise a well-balance diet that includes foods rich in carotene. For a smoker, a half-cup of carrots every day might possibly make the difference between life and death.
Among the groups studied, who had the most cases of lung cancer

A:Those with the lowest level of carotene intake. B:Those with the highest level o carotene intake. C:Those who ate only foods containing carotene. D:Those with the lowest intake of carrots.

Our lunch break from 11:50 AM to 1:40 PM. We are 86._______________ like bird that are set free from our cage. The first thing 87. _______________ we do is rush to the field to have the lunch. Students bring 88. _______________ out what they prepare in the morning for lunch, things 89. _______________ such as bread, carrots, drinks, etc. At lunch students who get 90. ______________ into three groups according to their liking, every doing their 91. ______________ own things. The first group of students like to sit in the field, 92. _____________ having lunch and talking. They eat very slow and talk about 93. _____________ the news, homework, etc. I don’t find it excited at all. 94. _______________ That is because I don’t usually eat lunch with them. 95. _____________

Our lunch break from 11:50 AM to 1:40 PM. We are 86._______________ like bird that are set free from our cage. The first thing 87. _______________ we do is rush to the field to have the lunch. Students bring 88. _______________ out what they prepare in the morning for lunch, things 89. _______________ such as bread, carrots, drinks, etc. At lunch students who get 90. ______________ into three groups according to their liking, every doing their 91. ______________ own things. The first group of students like to sit in the field, 92. _____________ having lunch and talking. They eat very slow and talk about 93. _____________ the news, homework, etc. I don’t find it excited at all. 94. _______________ That is because I don’t usually eat lunch with them. 95. _____________

Our lunch break from 11:50 AM to 1:40 PM. We are 86._______________ like bird that are set free from our cage. The first thing 87. _______________ we do is rush to the field to have the lunch. Students bring 88. _______________ out what they prepare in the morning for lunch, things 89. _______________ such as bread, carrots, drinks, etc. At lunch students who get 90. ______________ into three groups according to their liking, every doing their 91. ______________ own things. The first group of students like to sit in the field, 92. _____________ having lunch and talking. They eat very slow and talk about 93. _____________ the news, homework, etc. I don’t find it excited at all. 94. _______________ That is because I don’t usually eat lunch with them. 95. _____________