Talks and Conversations
Directions: In this part of the test, you will hear several short talks and conversations. After each of these, you will hear a few questions. Listen carefully because you will hear the talk or conversation and questions ONLY ONCE, when you hear a question, read the four answer choices and choose the best answer to that question. Then write the letter of the answer you have chosen in the corresponding space in your ANSWER BOOKLET.
听力原文:W: Hello, Jimmy, nice to meet you!
M: Hi, Sandy, can I have a word with you? Just a couple of minutes.
W: Sure. What's up? This morning I saw you in the telephone booth making a phone call. You looked a bit serious and worried.
M: Well, I got to use your advice Sandy. You know the science project that we have to finish by next Friday?
W: Yes, it put a little bit of pressure on all of us.
M: Well, I'm having trouble finding out information yet. I have been to the college library, but I couldn't find any books there.
W: Neither did I! But I asked my friend to borrow some from the main library of Hurl University. They have a good selection.
M: Lucky you! Would you mind if I borrow one of them for a few days?
W: Yes, sure. I have nearly finished with them. If you drop in sometime tomorrow afternoon, I think I can let you have all of them, provided of course, that you return them before next Wednesday, or my friend will be fined by the university library for those over-due books.
M: That would be great! Thanks a lot! I'll see you tomorrow afternoon then. Bye-bye!
W: OK, see you tomorrow afternoon, bye!
(31)
A.Make a phone call.
B.Ask for her advice.
C.Return some books.
D.Borrow her notes.
第1题
数据库的三级体系结构即关系子模式、(131)与存储模式,是对数据抽象的三个级别。 DBMS主要由(132)两大部分组成。SQL的SELECT语句中“From Q”(这里Q为基本表名),应理解为(133)。关系代数中的9连接操作由(134)操作组合而成。元组比较操作(c1,c2)<=(d1, d2),其意义等价于(135)。
A.外模式
B.内模式
C.关系模式
D.表模式
第2题
数据模型是——。
A.现实世界数据内容的抽象
B.现实世界数据特征的抽象
C.现实世界数据库结构的抽象
D.现实世界数据库物理存储的抽象
第4题
A.A.概念数据模型
B.B.抽象数据模型
C.C.逻辑数据模型
D.D.主题域模型
第5题
数据库的数据体系结构分为三个级别,(44)最接近用户,是用户能看到的数据特性。(45)涉及到所有用户的数据定义。最接近物理存储设备的是(46)。这些模型用数据库的(47)描述。
A.关系级
B.概念级
C.内部级
D.外部级
第6题
数据库的三级模式体系结构的划分有利于保持数据库()。
A.数据独立性
B.数据安全性
C.结构规范性
第8题
A.模式是对数据的抽象,数据的结构性描述称为模式
B.数据模型是对模式的抽象,模式的结构性描述称为数据模型
C.一个数据库是由一系列模式及其数据构成的
D.模式是对数据模型的抽象,数据模型的结构性描述称为模式
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