问题
单项选择题
在下面的说法中，( )是不正确的。
A．设计概念数据模型与DBMS的结构数据模型无关。
B．视图是外模式，也是一种数据库安全控制的方法。
C．事务是数据库恢复的基本单位。
D．DBMS一定拒绝违反参照完整性规则的操作。
答案
参考答案：D
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在下面的说法中，( )是不正确的。
A．设计概念数据模型与DBMS的结构数据模型无关。
B．视图是外模式，也是一种数据库安全控制的方法。
C．事务是数据库恢复的基本单位。
D．DBMS一定拒绝违反参照完整性规则的操作。
参考答案：D
完形填空(共20小题；每小题1.5分，共30分) 阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。 Once upon a time the colors of the world started to quarrel. Green said, "Clearly I am the most important. I am the sign of life and hope. I was chosen for grass, trees and leaves. Without me, all animals would ___36__." Blue interrupted, "You only think about the __37__, but consider the sky and the sea．__38__ the water that is the basis of life and drawn up by  the clouds from the deep sea．Without my peace, you would all be __39__." Yellow chuckled , "You are all so serious. I bring laughter, fun, and __40__ into the world．" Orange started next to blow her trumpet, "I am the color of health and strength. I may be __41__, but I am precious for I serve the needs of human life. When I fill the sky __42__, my beauty is so striking that no one gives another __43__ to any of you." Red could stand it __44__ and he shouted out, "I am the ruler of all of you. I am the color of danger and of bravery. I am willing to __45__ truth. I am also the color of passion and of love." Then came Purple and Indigo （深蓝）. … The colors went on boasting, each convinced of his or her own __46__. Their quarreling became louder and louder. Suddenly there was a startling flash of bright lightening thunder. Rain started to pour down __47__. The colors crouched down __48__, drawing close to one another for comfort. In the midst of the clamor （叫嚷）, rain began to speak, "You foolish colors, fighting __49__ yourselves, each trying to dominate __50__. Don't you know that you were each made for a special purpose, __51__? Join hands with __52__ and come to me." Doing as they were told, the colors __53__ and joined hands. They formed a colorful rainbow. From then on, whenever a good rain ___54__ the world, a rainbow appears in the sky. They remember to __55__ one another.
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