2. 外语
  3. If you are looking【C1】______information, library shelves are a good place【C2】______But if you need up-to-the-minute data or have

If you are looking【C1】______information, library shelves are a good place【C2】______But if you need up-to-the-minute data or have

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问题    If you are looking【C1】______information, library shelves are a good place【C2】______But if you need up-to-the-minute data or have specialized needs, you may【C3】______a computerized database more useful,【C4】______expensive, and less time consuming. A database, a file of【C5】______on one subject or family of subjects, can be【C6】______and maintained in a computer’ s memory. The speed of the computer then enables you【C7】______any item in this file almost instantly.
   The three main types of databases are statistics, bibliographies (书目) , and full text. Statistical databases store vast【C8】______of numerical (数字的) data, such as wage and price indexes, census (人口普查) information, foreign exchange rates, and bond prices. Bibliographic databases store references and【C9】______of articles【C10】______periodicals and newspapers. Fulltext databases offer the complete texts of such materials【C11】______newspaper, magazine and journal articles.
   【C12】______databases exist today, and their numbers are【C13】______Many companies【C14】______their in-house database,【C15】______is accessible【C16】______employees through computer terminals or microcomputers.【C17】______addition, several hundred commercial data bases are now available【C18】______the public, with literally millions of information readily retrievable (可检索的). These databases cover specific【C19】______, such as law and financial【C20】______, or general information, such as sports and weather data.
【C9】
选项 A、summaries
B、summary
C、extract
D、extracts
答案A
解析 summary的意思是“摘要、概括”；extract的意思是“摘录、节选”。这里说的是书目型数据库所储存的内容，所以应是文章的参考资料和摘要，而且应该是复数形式，故选A。
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