数据的物理独立性是指当数据库的 (40) 。 A．外模式发生改变时，数据的物理结构需

根据对话内容，选择恰当的句子补全下列对话。（每小题1分，共5分）

A. I will come back soon. B. For a whole week. C. Where did you buy it? D. Why did you go to Qingdao? E. I hope to visit it one day. F. When did you go there? G. Did you go there?

A: Hi, Lin Mei. You look so nice in the red skirt.
B: Thank you very much.
A: 小题1:_________
B: In Qingdao.
A: Qingdao? 小题2:_________
B: Last week. I went there with my family.
A: How long did you stay there?
B: 小题3:_________ We went sightseeing in many places.
A: We all know the beaches of Qingdao are very beautiful. 小题4:_________
B: Yes, when I was lying on the beach, I felt so cool and relaxed.
A: 小题5:_________
B: I’m sure you will love it.