问题 单项选择题

微软公司开发了一种音视频流媒体文件格式,其视频部分采用了MPEG-4压缩算法,音频部分采用了压缩格式WMA,且能依靠多种协议在不同网络环境下支持数据的传送。这种流媒体文件的扩展名是

A. ASF

B. WAV

C. GIP

D. MPEG

答案

参考答案:A

解析:ASF的视频部分采用了MPEG-4压缩算法,音频部分采用了压缩格式WMA。 WAV是微软公司专门为Windows开发的一种标准数字音频文件,该种文件能记录各 种单声道或者立体声的声音信息。GIF是一种图像文件,提供了数据压缩功能和图像 累进显示功能,可将多幅图像保存在一个文件中。MPEG是采用国际标准MPEG对 音频数据进行压缩和组织的文件,能支持多种分辨率、多种帧速率的视频图像编码。

填空题
阅读理解

The question of what children learn, and how they should learn, is continually being debated and redebated. Nobody dares any longer to defend the old system, the learning of lessons parrot-fashion, the grammar-with-a-whip system, which was good enough for our grandparents. The theories of modem psychology have stepped in to argue that we must understand the need of children. Children are not just small adults; they are children who must be respected as much.

Well, you may say, this is as it should be, a good idea. But think further. What happens? "Education" becomes the responsibility not of teachers, but of psychologists (心里学家). What happens then? Teachers worry too much about the psychological implications (暗示) of their lessons, and forget about the subjects themselves. If a child dislikes a lesson, the teacher feels that it is his fault, not the child’s. So teachers worry whether history is "relevant" to modern young children. And do they dare to recount stories about violence? Or will this make the children themselves violent? Can they tell their classes about children of different races, or will this encourage racial hatred? Why teach children to write grammatical sentences? Verbal expression is better. Sums? Arithmetic? No: Real-life mathematical situations are more understandable.

You see, you can go too far. Influenced by educational theorists, who have nothing better to do than to write books about their ideas, teachers leave their teacher-training colleges filled with grand, psychological ideas about children and their needs. They make elaborate, sophisticated (精致的,复杂的) preparations and try out their "modem methods" on the long-suffering children. Since one "modem method" rapidly replaces another the poor kids will have had a good bellyful by the time they leave school. Frequently the modem methods are so sophisticated that they fail to be understood by the teachers, let alone the children; even more often, the relaxed discipline so essential for the " informal" feelings the class must have, prevents all but a handful of children from learning anything.

8. People do not dare defend the old system mainly because under the old system________.

A. too much grammar was taught to children     B. children were spoiled (宠坏)

C. children were treated as grown-ups          D. children were made to learn passively(被动的)

9. What view do the modem psychologists hold?

A. Children must be understood and respected.

B. Children are small adults and know what they need.

C. Children are better off without learning lessons.

D. Education of children is the responsibility of psychologists.

10. What happens when teachers pay too much attention to the psychology of their lessons?

A. They find that the children dislike the lessons.

B. They tend to blame students for their failure.

C. They do not pay enough attention to the actual lessons.

D. They no longer want to teach children history.

11. Grammatical sentences are regarded as unimportant because ________.

A. it is better to use verbs only

B. words are said out of natural feelings only

C. talking freely and naturally without sentences is a better form of expression

D. it is felt that formal grammar rules might cause unnatural expressions

12. According to the passage, the modern methods are understood by ________.

A. neither teachers nor pupils      B. only a handful of teachers and pupils

C. the more sophisticated teachers  D. everyone who enjoys the relaxed discipline of the informal classes