问题
单项选择题
概念模型是将现实世界的客观对象抽象为某一种信息结构，它并不依赖于计算机系统，它的基本语义单位是______。
A．位与字节
B．数据与信息
C．实体与联系
D．概念与模型
答案
参考答案：C
解析：[评析] 实体是指客观存在并相互区别的事物。实体可以是具体的人、事、物，也可以是抽象的概念或联系。联系在信息世界中反映为实体内部的联系和实体之间的联系。
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概念模型是将现实世界的客观对象抽象为某一种信息结构，它并不依赖于计算机系统，它的基本语义单位是______。
A．位与字节
B．数据与信息
C．实体与联系
D．概念与模型
参考答案：C
解析：[评析] 实体是指客观存在并相互区别的事物。实体可以是具体的人、事、物，也可以是抽象的概念或联系。联系在信息世界中反映为实体内部的联系和实体之间的联系。
Mike didn’t do his English homework. The teacher asked him 31 . “I’m sorry, I 32 .” “But why did you forget?” “It didn’t seem 33 or important,” said Mike. “Are you going to punish (惩罚)me?” asked Mike. “ 34 . The punishment is for me. I didn’t teach you well,” said the teacher. “Thank you,” said Mike. “You are the best 35 in the world. I can never know as much as you , but you taught me a lot.” “How can I be a good teacher if the students do not know more than me? I will not succeed until that happens,” 36 the teacher. Mike’s 37 teacher was a strict（严厉的） man.. Every day Mike played the same piece of music,and the teacher said it was not good and he must practise 38 . After two years of hard work, Mike left and felt sad. 39 when he played it in public, everyone said it was perfect, and he found he could play other pieces of music easily. What do you think of these two 40 ?
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