If you are looking for information, library shelves are a good place to start. But if you need up-to-the-minute data or have specialized needs, you may find a computerized database more useful, less expensive, and less time 11 .A database, a file of information on one subject or family of subjects, can be stored and 12 in a computers memory. The speed of the computer then 13 you to recall any item in this file almost 14
The three main types of databases are statistical, bibliographic, and full text. Statistical databases store 15 amounts of numerical data, such as wage and price indexes, census information, foreign 16 rates and bond prices. Bibliographic databases store references to and summaries of articles in periodicals and newspapers. Full-text databases offer the complex texts of such 17 as newspaper, magazine, and journal articles.
Thousands of databases exist today, and their numbers are growing. Many companies have their in-house database, which is 18 to employees through computer terminals or microcomputers. In addition, several hundred commercial databases are now available to the 19 , with literally millions of items of information readily obtainable. These databases 20 specific fields, such as law and financial forecasting, or general information, such as sports and weather data.
A. exchange B. public C. instantly D. cover
E. enables F. consuming G. remained H. materials
I. hide J. intensively K. vast L. communications
M. exhausting N. accessible 0. maintained
II. F 12. O 13. E 14. C 15. K 16. A 17. H 18. N 19. B 20. D
陕旅版英语四上《Unit 5 Our School》课件4
陕旅版英语六上《Lesson 6 My room is very nice》教学设计
陕旅版英语六上《Lesson 1 May I use the telephone》课件3
陕旅版英语四上《Unit 7 It s Tuesday》课件1
陕旅版英语六上《Lesson 12 We are going to see》课件3
陕旅版英语六上《Lesson 14 Will he teach you next term》导学案
陕旅版英语六上《Lesson 11 See a doctor》课件1
陕旅版英语六上《Lesson 2 May I speak to Li Shan piease》课件1
陕旅版英语四上《Unit 6 What Subjects Do They H》课件1
陕旅版英语六上《Lesson 1 May I use the telephone》课件2
陕旅版英语五上《Lesson 2 What s the weather like》导学案
陕旅版英语六上《Lesson 1 May I use the telephone》教案
陕旅版英语六上《Lesson 13 What are you going to do tomorrow》课件1
陕旅版英语五上《Lesson 14 I m going to Xi an》课件2
陕旅版英语六上《Lesson 10 I have a headache》课件2
陕旅版英语四上《Unit 4 When Do You Have Classe》课件1
陕旅版英语六上《Lesson 14 Will he teach you next term》课件2
陕旅版英语六上《Lesson 4 Where are they》课件2
陕旅版英语五上《Lesson 13 I m going to Hainan》课件3
陕旅版英语六上《Lesson 5 It s next to the office》课件1
陕旅版英语四上《Unit 4 When Do You Have Classe》课件2
陕旅版英语六上《Lesson 11 See a doctor》课件2
陕旅版英语六上《Lesson 4 Where are they》教案
陕旅版英语六上《Lesson 12 We are going to see》课件1
陕旅版英语五上《Lesson 14 I m going to Xi an》课件3
陕旅版英语五上《陕旅版英语五上《Lesson 13 I m going to Hainan》课件1》课件1
陕旅版英语五上《Lesson 9 What s the date today》课件2
陕旅版英语五上《Lesson 14 I m going to Xi an》课件1
陕旅版英语六上《Lesson 12 We are going to see》课件2
陕旅版英语六上《Lesson 13 What are you going to do tomorrow》课件2
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