阅读理解

　　There are three main kinds of food. Sugar and starch are grouped together as carbohydrates(碳水化合物) , they are found in bread, potatoes and rice. These are mainly energy-giving foods which the muscles and other tissues use. Fats are also energy-giving foods but do not give it up as quickly as the sugars and starches as they have to be broken down in the liver(肝)and made into sugar before they can be burnt by the body. Proteins(蛋白质), the third class, are the main solid part in all living cells(细胞). They are found in milk, meat and fish, and are necessary to the body in building new cells. For this reason growing children need more proteins than adults. Children cannot get much of their energy form fat because it makes them unwell if they eat too much of it.

　　In addition to these foods the body needs small quantities of vitamins. Vitamin A and D are found in fat. If a child doesn’t receive enough vitamin D, his bones do not harden so that he begins to walk late and when he does so his bones bend(弯曲). Vitamin C is found in fresh fruit and vegetables. If people go short of vitamin C, they developed scurvy(坏血病). Normal people need very little of these vitamins which they get easily in an ordinary diet, so there is no need to take vitamin pills. Babies, however, get very little to eat so that they have to be given in orange juice to prevent scurvy.

1．According to this article there are three main kinds of food. They are ________.

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A．sugar, fats and vegetables

B．carbohydrates, fats and milk

C．carbohydrates, fats and proteins

D．sugar, fats and meat

2．Milk, meat and fish are rich in ________.

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3．Which of the following is not true?

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A．Children need less proteins because they are smaller in size.

B．Fat cannot be used directly by the body.

C．Carbohydrates, fats and proteins are all energy-giving foods.

D．Too much fat is not good for children.

4．Which of the facts is caused by the lack of vitamin D?

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5．Normal people can get enough vitamin C ________.

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A．by taking vitamin pills

B．by drinking orange juice

C．from their ordinary diet

D．from the fat they eat