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  3. A balanced diet provides an adequate intake of nutrients for maintenance of the body and therefore good health. A diet can easil

A balanced diet provides an adequate intake of nutrients for maintenance of the body and therefore good health. A diet can easil

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问题     A balanced diet provides an adequate intake of nutrients for maintenance of the body and therefore good health. A diet can easily be adequate【C1】______normal body functions, yet may not be a balanced diet. An ideal human diet【C2】______fat, protein, and carbohydrates (碳水化合物) in correct【C3】______The exact amount varies for each【C4】______because everyone has different metabolic (新陈代谢的) rates and levels of activity. Malnutrition (营养不良) results【C5】______an unbalanced diet, this is【C6】______an excess of some dietary components and【C7】______of other components. Too much of one component can be as much【C8】______to the body as too little. Energy is【C9】______by carbohydrates, fats and proteins. Proteins are【C10】______used as building blocks for repair of many body tissues. The energy providing compounds are needed in【C11】______quantities in our diet. We also need much smaller amounts of other nutrients, such as vitamins and minerals.【C12】______the small quantities needed these are essential to provide a healthy diet as they have【C13】______roles in metabolic reactions. The【C14】______absorbed are converted to other compounds which are then used for metabolism. Starch, a major carbohydrate, can be then synthesized into fat for【C15】______There are some organic compounds which in spite of being【C16】______for health cannot be made by cells. A balanced diet is imperative to【C17】______a healthy body. People who choose to be vegetarians and【C18】______must make sure that their diet contains all the correct nutrients to【C19】______any deficiencies. This is the same for people living in countries【C20】______their diet lacks certain important food groups.
【C14】
选项 A、elements
B、components
C、nutrients
D、ingredients
答案C
解析 名词辨析题。结合上下文可知，本句想表达的是“被吸收的营养成分被转化成其他的化合物”，故应选nutrients。elements“要素”；components“成分”；ingredients“成分，原料”。这三个词虽然都表示“基本成分，要素”，但是没有“营养成分”的意思。
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大学英语四级

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