数据库设计包括两个方面的设计内容，它们是______。
A．概念设计和逻辑设计
B．模式设计和内模式设计
C．内模式设计和物理设计
D．结构特性设计和行为特性设计
参考答案：A
解析：[分析] 数据库设计可分为概念设计与逻辑设计。数据库概念设计的目的是分析数据间内在语义关联，在此基础上建立一个数据的抽象模型。数据库逻辑设计的主要工作是将E-R图转换为指定的 RDBMS中的关系模型。
请仔细阅读下面的短文，读后按信息表中项目要求，填写下面的表格。 Nowadays more and more people are worrying about their health. But how to keep healthy？Different people may give different answers to this question. In my opinion, it is important to do the following. First, we should take exercise every day. Plenty of exercise helps us build a strong body and makes us work better. That is why more and more people are becoming active in different kinds of sports and exercises. In morning many people get up early and take exercise. Some practice running while others walk or dance to music. In the afternoon, there are also many people doing sports. Some play basketball or volleyball, others play football or badminton. Second, have a healthy diet. Over-eat or too little food is very bad for our health. We should not eat too much or too little for every meal. We should eat healthy food, such as all sorts of grain, green vegetable and fruit. Third, give up bad habits like smoking and drinking. Because they are also bad for people’s health. All above are my thoughts about keeping healthy. If we can do as them, we will become healthier and stronger.
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