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 o

If you are looking【C1】________information, library shelves are a good place【C2】________. But if you need up-to-the-minute data o

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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. 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【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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