问题 单项选择题

数字视频信息的数据量相当大,对PC机的存储、处理和传输都是极大的负担,为此必须对数字视频信息进行压缩编码处理。目前VCD光盘上存储的数字视频采用的压缩编码标准是

A.MPEG-1

B.MPEG-2

C.MPEG-4

D.MPEG-7

答案

参考答案:A

解析: 本题考查计算机中视频信息的表示。MPEG-1中,源图像格式是CIF格式的,压缩后的码率为1.5Mb/s,故适用于VCD。

阅读理解

阅读理解。

     Want to be an astronaut? Then "study hard, stay healthy and have perseverance (毅力)

      This is what Chinese astronauts Fei Junlong and Nie Haisheng said in a talk with some students.

      Students were interested in the astronauts' space lives. They asked questions like "Did you see the Great

Wall from space?" Fei and Nie said they didn't see the Great Wall. But they felt excited when they passed

over China, including Taiwan. The island "looked very beautiful, like a jade (翡翠)".

     Speaking of their lives beyond (在……之外) the earth, the two astronauts said cooperation (合作) with

each other was most important."We are like the left and right hands," they said.

      Young people wanted to know how the astronauts developed their careers (事业).

     "How did you decide to be astronauts when China's space industry (工业) is still at the beginning?" asked

a young woman. The astronauts said it was because of their love of flight and also the need of the country.

      They said their love of flight could be seen from their children's names. Nie's daughter is called "Nie

Tianxiang", which means "flying up high". Fei's son is called "Fei Di", which sounds like "Feidie", meaning

UFO.

     After the success of Shenzhou VI, China plans to put a man on the moon and build a space station in

10~15 years.

1. If you want to be astronauts, what should you do from now on?

A. We should change our names.

B. We should be interested in the astronauts' space life.

C. We should love the flight and our country.

D. We should study hard, stay healthy and have perseverance.

2. What's the Chinese meaning of the word "cooperation" in the passage? 

A. 友好

B. 竞争

C. 合作

D. 手术

3. In 10~15 years, China could put a man on ______ and build a space station.

A. Shenzhou VII

B. UFO

C. the moon

D. the sun

4. Which of the following is true?

A. Nie Haisheng saw the Great Wall from space.

B. Fei Junlong met UFO in space.

C. The astronauts couldn't see Taiwan from space.

D. Fei and Nie make a contribution to China's space industry

判断题