数据库系统由数据库、 (35) 和硬件等组成，数据库系统是在 (36) 的基础上发展起来的。
数据库系统由于能减少数据冗余，提高数据独立性，并集中检查 (37) ，由此获得广泛的应用。数据库提供给用户的接口是 (38) ，它具有数据定义、数据操作和数据检查功能，可独立使用，也可以嵌入宿主语言使用。 (39) 语言已被国际标准化组织采纳为标准的关系数据语言。
37（）
A．数据完整性
B．数据的可用性
C．数据的操作性
D．安全性
参考答案：A
There are some funny activities this week! Everyone who is interested in them looks at the notice!
| Monday Meeting Room 19:00—21:30 Dr.Thomas West’s report: Space and Man Come and listen to it if you want to learn more about the stars and the universe. | Wednesday Science Room 18:00—20:00 Mrs Smith’s report: UFO Would you like to learn about UFOs? Please come and listen. |
| Friday Meeting Room 18:30—21:00 Mr Green’s lesson: Computer Science Mr Green is from Oxford University. Learn to use computers. | Sunday Library 18:30—11:30 Robot Show You can see all kinds of robots made by the students. You may also bring your own robot here. |
小题1:Who can you learn something about UFOs from?A．A student.
B．Mrs Smith.
C．Mr Green.
D．Dr.Thomas West.小题2:What does Mr Green from Oxford University teach?
A．Computer science.
B．Robot science.
C．Space science.
D．Life science.小题3:When may you have a chance to show people your robot?
A．On Monday.
B．On Wednesday.
C．On Friday.
D．On Sunday.小题4:If you are free on Monday, you can go to .
A．Mr Green’s lesson
B．a report about UFO
C．a report about Space and Man
D．see some robots小题5:If you want to learn how to use computers, you can go to the lesson .
A．from 8:30 am to 11:30 am on Sunday
B．from 7:00 pm to 9:00 pm on Monday
C．from 6:00 pm to 8:00 pm on Wednesday
D．from 6:30 pm to 9:00 pm on Friday