Unit Sixteen
　　Passage 2
　　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 computer’s 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

買(mǎi)知識(shí)，賣(mài)知識(shí)，就上233考試大！還可以免費(fèi)賺取現(xiàn)金哦！
·您手頭有好東西嗎？上傳上來(lái)和大家一起分享吧！你也可以求購(gòu)你自己想要的資料。 　　·上傳您的精品資料，可獲得收入，既可在網(wǎng)站上進(jìn)行消費(fèi)，也可提取現(xiàn)金。 　　·若被評(píng)為資料，還可以增加任務(wù)分值。了解更多>>

　　編輯推薦：
　　2012年12月大學(xué)英語(yǔ)四級(jí)報(bào)名時(shí)間
　　2012年12月英語(yǔ)四級(jí)考試時(shí)間及流程