2. 外语
  3. The United States government publishes guidelines for appropriate nutrient intakes. These are known as the Recommended Dietary A

The United States government publishes guidelines for appropriate nutrient intakes. These are known as the Recommended Dietary A

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问题     The United States government publishes guidelines for appropriate nutrient intakes. These are known as the Recommended Dietary Allowances (RDAs) and are updated regularly based on new research in nutrition. RDAs are suggested amounts of calories, protein, and some minerals and vitamins for an adequate diet. For other dietary substances, specific goals must await further research. However, for the U.S. population as a whole, increasing starch and fiber in one’s diet and reducing calories (primarily from fats, sugar, and alcohol) is sensible. These suggestions are especially appropriate for people who have other factors-for chronic diseases due to family history of obesity, premature heart disease, diabetes, high blood pressure, and high blood cholesterol, or for those who use tobacco.
    Snacks can furnish about one-fourth of the calorie requirements among teenagers. Those snacks should also provide much of the day’s allowances for protein, minerals, and vitamins. Sandwiches, fruit, and milk make good snacks for active teenagers. Food from the food pyramid may be part of any meal. A grilled cheese sandwich or a bowl of whole-grain cereal is just as nutritious in the morning as it is at noon. In addition, a good breakfast consists of any foods that supply about one-fourth of the necessary nutrients for the day.
In this passage RDAs refers to ______.
选项 A、types of vitamins
B、types of protein
C、types of minerals
D、amounts of energy, protein, vitamins, and minerals
答案D
解析 见文章第三句：RDAs are suggested amounts of calories，protein，and some minerals and vitamins for an adequate diet．选项D正确，选项A、B、C都不全面。
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