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.
【C18】

选项 A、for
B、to
C、in
D、on

答案B

解析 be available to为固定搭配，表示“可接近的”，故选B。

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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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有三个关系R、S和T如下：则由关系R和S得到关系T的操作是（）。