2. 外语
  3. Plugging into Electronic Databases If you are looking【C1】______information, library shelves are a good place【C2】______. But i

Plugging into Electronic Databases If you are looking【C1】______information, library shelves are a good place【C2】______. But i

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问题                  Plugging into Electronic Databases
   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, and full text. Statistical databases store vast【C8】______of numerical data, such as wages and price indexes, census information, foreign exchange rates, and bond prices. Bibliographic databases store references to and【C9】______of articles【C10】______periodicals and newspapers. Full-text 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 have their【C14】______database,【C15】______is accessible【C16】______employees through computer terminals or microcomputers.【C17】______addition, several hundred commercial data bases are now available【C18】______the public,【C19】______literally millions of information readily retrievable. These databases cover specific fields, 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 summaries(概要)，extracts(摘录)；从上下文判断应为复数，所以答案为A。
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