问题 单项选择题

______图像使用调色板来定义像素的真实颜色。

A.二值

B.伪彩色

C.真彩色

D.矢量

答案

参考答案:B

解析:[分析] 本题考查对数字图像文件格式基础知识的了解和掌握。彩色图像一般可以使用“真彩色”表达方式或者“伪彩色”表达方式。所谓真彩色图像是指在组成一幅彩色图像的每个像素值中,有R,G,B三个基色分量,每个基色分量直接决定显示设备的基色强度,这样表达的彩色数字图像被称为真彩色图像;而在伪彩色图像格式中每个像素的颜 色不是由每个基色分量的数值直接决定的,而是把像素值当作彩色查找表(调色板)的表项入口地址,去查找一个显示图像时使用的R、G、B强度值,用查找出的R、G、B强度值产生的真正的像素颜色。

单项选择题
阅读理解

阅读理解。

      Each Tuesday afternoon, after the bell rings for the fourth period, Liu becomes a fashion designer. At the

same time, the rest of the students at the High School Attached to Yunnan Normal University in Kunming are

also having classes a little bit different from the usual ones. Some students dance, others create robots, and

still others review films. These are just a few of the other 27 elective (选修的) courses besides Liu's sewing

class that the school began to offer last month.

      "The fashion design class has become the bright point of my week. I learn how to choose colors and

fabrics (织物) as well as sewing and sketching (素描) skills. It's all helping me to realize the dream of

becoming a fashion designer I've had since I was a little girl," Liu said.

      Design is Liu's favorite, but for other students the electives are interesting lessons which relieve (舒缓)

the pressures of schoolwork. Some students, for example, are learning how to play bridge. Chen Xi, 15, is

one of them. She said, "Many people think that playing a card game like this in class is a waste of time. But

in fact, bridge is a very challenging game that helps develop memory and math skills."

1. How often do the students have elective classes? [ ]

A. Once a week

B. Once a month

C. Once a term

D. Once a year

2. How many elective courses had the school offered by last month? [ ]

A. 27

B. 28

C. 26

D. 25

3. Why did the students like to have elective classes?[ ]

A. Because the elective classes are easier.

B. Because they needn't do any homework in the elective classes.

C. Because they can get an opportunity to relieve their pressures.

D. Because they want to be fashion designers in the future.

4. According to the passage many people think _____ in class is a waste of time.[ ]

A. dancing

B. creating robots

C. playing a card game

D. reviewing films