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问题 单项选择题

完整的原型化的工具，应具有几个基本成分。以下成分中哪个(些)是原型化工具应该具备的　　Ⅰ集成数据字典　　　　　　　　　　　Ⅱ．高适应性的数据库管理系统　　Ⅲ．非过程查询语言和报告书写器　　　Ⅳ．自动文档编辑器　　Ⅴ．屏幕生成器

A．Ⅰ和Ⅴ

B．Ⅰ和Ⅳ

C．Ⅲ和Ⅳ

D．全部

答案

参考答案：D

解析：回收用户U1，U2和U3在关系employee的salary属性上的UPDATE权限的语句是REVOKE UPDATE(salary) ON employee FROM U1，U2，U3。

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由实业、实利与实用主义教育思想发展来的中国现代职业教育“内容”，即文艺教育，解决“（）”的问题；生计教育，解决“（）”的问题；卫生教育，解决“（）”的问题；公民教育，解决“（）”的问题。
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The United States counts its population every ten years, and each census reveals that the racial and ethnic mix is changing dramatically, so by the year 2050, the "average" American will not be descended from (1) , but the majority of U. S. residents will trace (2) ancestry to Africa, Asia, the Hispanic world, the Pacific Islands, or the Middle East. Once the United States was a microcosm of European nationalities, (3) the United States is a microcosm of the world. The United States is (4) considered a "melting pot" society by many of its residents. (5) , many people prefer the term "salad bowl." They use this (6) to describe American society. American society will soon be (7) nonwhite. "Melting pot" implies that the different ethnic groups blend together (8) one homogeneous (9) , "salad bowl" (10) that nationalities, like the ingredients in a mixed green salad, retain their cultural (11) . Earlier generations of (12) believed they had to learn English quickly not only to survive but also for (13) .
Now, many immigrant groups do not (14) the same need. Because there are many places in America (15) you can work, shop, get medical care, marry, divorce and die without knowing English. (16) , Chinatown in San Francisco and New York. Also, Los Angeles has many Vietnamese immigrants and immigrants from Mexico. (17) , many immigrant groups want their children to know their (18) culture. Many Hispanics, for instance, want their children to learn (19) English and Spanish and study the Spanish language in school. They are fighting for the (20) to bilingual education in many communities. In many communities they are in the majority.
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