问题 填空题

数据库管理系统常见的数据模型有层次模型、网状模型和 【5】 三种;

答案

参考答案:关系模型

解析:[评析] 数据库管理系统是位于用户与操作系统之间的一层系统管理软件,是一种系统软件,是用户与数据库之间的一个标准接口,其总是基于某种数据模型,可以分为层次模型、网状模型和关系模型。

单项选择题
阅读理解

任务型填词。

     请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。

注意:每个空格只填1个单词。

     The most important factor (因素) that leads to success is what you do every single day. Your habits will

decide whether you are successful or not. If you have strong and healthy positive habits, it does not matter

whether or not you fail today because you will succeed in the long term. Having positive habits does not mean

that you will succeed every single time. However, in the long term, there is no doubt that you will achieve all

your goals and be successful. On the other hand, if you have strong negative habits, you will fail in the long

term. It does not matter whether you succeed today or not. Why are habits so important?

     A single positive action will not change your life, but the same action repeated 1,000 times will have a great

effect on your life. For example, if you go to the gym one time, you won't see a big difference in your life.

However, if your go to the gym 1,000 time over a five-year period, you will see a big difference in your body.

The same principle (原则) is true of finance (金融), health, relationships, work, career, and school. Simple

positive actions repeated every single day will have a great effect on your life in the long run. How to develop

positive habits?

     There's nothing easier than developing positive habits. You simply have to do every single day the action

you want to make a habit. If you want to develop the habit of running, run almost every day. If you want to

develop the habit of reading, read every day. Habits are created by repetition (重复). The more you do an

action. the easier it becomes in the long run. How to get rid of negative habits?

      The only way to destroy negative habits is to stop reinforcing (加强) them. If you are a smoker, stop

smoking. If you are a drug user, stop using drugs. Yes, it will be very difficult at the beginning. The first

week will be very hard. After three weeks, you will feel a lot better. It's hard to get rid of negative habits

because you got a lot of pleasure from these habits in the past. You can do it!

     Everybody can change. All it takes is courage and determination. Decide right now to improve your life

by changing your habits. Take action right now! Don't be afraid. Yes, you will probably make mistakes along

the way. But never forget that success is waiting for you if you have positive habits in your life. If you refuse

to give up, success will be yours.