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.
The passage implies which of the following?
选项 A、The time of day when food is consumed affects its nutritive value.
B、Different foods can be combined to increase total nutrition value.
C、It can be detrimental to your health to eat breakfast foods later in the day.
D、When food is eaten has no bearing on its nutritive effects.
答案B
解析 本文第一段第一和第三句介绍：美国政府公布了饮食中合理摄入营养的指导，且建议要有合理的热量、蛋白质、矿物质和维生素的摄入量；文章第二段第四句Food from the food pyramid may be part of any meal．说明每顿饭都是由食物金字塔里的食物构成的。由此推出摄取不同的食物可增加营养价值，选项B正确。
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