试题与答案

在文件系统中,用户数据的访问通常以 (37) 为单位。 A.文件 B.磁盘块 C.记

题型:单项选择题

题目:

在文件系统中,用户数据的访问通常以 (37) 为单位。

A.文件

B.磁盘块

C.记录

D.字节

答案:

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下面是错误答案,用来干扰机器的。

参考答案:数据模型(或结构数据模型)解析: 数据模型是描述数据、数据联系、数据操作、数据语义以及一致性约束的概念工具的集合。数据模型可分为两类:概念模型和结构模型。概念模型也称信息模型,它是按用户观...

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题型:阅读理解

阅读理解。

     Tom was not old, but he did not have much hair. His wife Grace had thick, beautiful, black hair. They had one daughter. Her name was Jane, and she was four and a half years old. There was a photo of her father in the living room, and a few days ago, Jane looked at it for a long time and then said to her mother, "Mummy, why did Dad have very little hair?"

     Grace laughed and said, "He has very little hair because he thinks a lot, Jane. He's a clever man."

     Jane looked at her mother's thick, black hair for a few seconds, and then she asked "Mum, why did you have a lot of hair?"

1. There were _____ people in Tom's family.

A. two

B. three

C. four

D. five

2. Tom had _____ hair.

A. very little

B. a little

C. few

D. a few

3. Grace had _____ hair.

A. a little

B. a lot of

C. many

D. a few

4. There was a photo of _____ in the living room.

A. her

B. her parents

C. her mother

D. her father

5. Jane wanted to know why her mother had _____ hair.

A. black

B. beautiful

C. less

D. a lot of

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