问题
填空题
在数据库理论中，数据物理结构的改变，如存储设备的更换、物理存储的更换、存取方
式改变等都不影响数据库的逻辑结构，从而不引起应用程序的变化，称为______。
答案
参考答案：物理独立性
解析： 数据的物理结构改变，不影响数据库的逻辑结构，从而不引起应用程序的变化，这种性质叫做物理独立性。
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在数据库理论中，数据物理结构的改变，如存储设备的更换、物理存储的更换、存取方
式改变等都不影响数据库的逻辑结构，从而不引起应用程序的变化，称为______。
参考答案：物理独立性
解析： 数据的物理结构改变，不影响数据库的逻辑结构，从而不引起应用程序的变化，这种性质叫做物理独立性。
| 完形填空。 | |||
| My pen friend is a kind and friendly girl. She is in England. Her 1 is Connie. I meet Connie 2 the Internet, and we are both twelve years 3 . First, I 4 a letter to her and introduce my hobbies, my school and my daily life. A few days later, I receive Connie’s 5 . She 6 me a lot about herself. I learn that she loves languages, sports and movies. She likes China and Chinese food very much. She tells me something about England, too. Connie is good at English, French（法语）and Spanish（西班牙语）, so I ask her to 7 me a little of them. Connie wants to learn some 8 , but it’s very difficult for her. Through Connie, I know 9 about the world outside. I would like to 10 Connie some day in England. | |||
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