试题与答案

在撰写科研报告时，正确的做法是（）。 A.表述自己的论点，缺乏科学的论证 B.罗列大

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题目：

在撰写科研报告时，正确的做法是（）。

A.表述自己的论点，缺乏科学的论证

B.罗列大量材料

C.采用图、表、照片来集中反映数据和关键的情节

D.尽量采用文字叙述

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C

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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.

Why are RDAs regularly updated

A．New discoveries in the science of nutrition are constantly being made.

B．Americans’ diets are constantly changing.

C．As people age, their nutritional needs change.

D．Very little is currently known about nutrition.
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