问题
单项选择题
数据库设计的4个阶段是：需求分析、概念设计、逻辑设计和( )。
A．编码设计
B．测试阶段
C．运行阶段
D．物理设计
答案
参考答案：D
解析：数据库的生命周期可以分为两个阶段：一是数据库设计阶段；二是数据库实现阶段。数据库的设计阶段又分为如下4个子阶段：即需求分析、概念设计、逻辑设计和物理设计。
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数据库设计的4个阶段是：需求分析、概念设计、逻辑设计和( )。
A．编码设计
B．测试阶段
C．运行阶段
D．物理设计
参考答案：D
解析：数据库的生命周期可以分为两个阶段：一是数据库设计阶段；二是数据库实现阶段。数据库的设计阶段又分为如下4个子阶段：即需求分析、概念设计、逻辑设计和物理设计。
请先阅读下面短文，掌握其大意，然后根据短文内容从下面方框内的七个选项中，选择五个还原到文中，使短文意思通顺、结构完整。  You have been thinking about it all week. It kept you awake last night. Now, as you walk to the front of the class, your throat is dry and your stomach feels funny. 81. __________________________ However, by making a few small preparations and rehearsing (预演) carefully, you too can be a public speaking star. 82. __________________________ Being excited about your topic is necessary for all the good speeches, so it's important to choose carefully. If you enjoy your topic, your audience (观众) will, too. Even if you are given a topic, try to find something about it that is exciting or funny. Next, do some research. Don't just research your topic. 83. _________________________ If you can, study video of a great speaker to see how they move, speak, and pause (停顿). Copying their style will help you to write a great speech. After researching, it's time to write your speech. During this stage, think of your audience all the time. 84. __________________________ It helps you relax if you know that your audience is enjoying your speech. Finally, rehearse. You really need to rehearse a lot. Measure your speech with a watch, and practice in front of a mirror (镜子). 85. __________________________ If you have followed all these steps, you should be ready for your audience. Good luck!
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