影响戒烟行为的促成因素为（） A.法规如公共场所禁烟 B.吸烟危害知识 C.个人价值

可以一天一次给药用于尿路感染治疗的药物是（）

A.氯法齐明

B.伊曲康唑

C.洛美沙星

D.新霉素

E.头孢唑林

20， 32， 58， 112， 222， ( )。

A．300

B．333

C．400

D．444

如果银行汇票丧失，持票人要求退款，持票人应提交（）

A.人民法院出具的其享有票据权力和实际结算金额的证明

B.介绍信

C.持票人身份证件和复印件

D.挂失止付通知书

熔合区是焊接接头中，焊缝向热影响区（）的区域。

A.扩散

B.传导

C.过渡

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________.

A．types of vitamins

B．types of protein

C．types of minerals

D．amounts of energy, protein, vitamins, and minerals