试题与答案

下面的一段叙述中,空缺处信号的英文名称分别是( )。 “8237接收到通道的DM

题型:单项选择题

题目:

下面的一段叙述中,空缺处信号的英文名称分别是( )。
“8237接收到通道的DMA请求信号 后,向CPU发出总线请求信号 ,CPU接收到该信号后,在当前总线周期结束之后让出总线,并使总线允许信号 有效;当8237获得CPU送来的该信号后,便产生DMA响应信号 送到相应的外设端口,表示DMA控制器响应外设的DMA请求,从而进入DMA服务过程。”

A.DREQ、DACK、HRQ、HLDA
B.DREQ、HLDA、DACK、HRQ
C.HRQ、DREQ、DACK、HLDA
D.DREQ、HRQ、HLDA、DACK

答案:

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Every artist knows in his heart that he is saying something to the public. Not only does he want to say it well, but he wants it to be something which has not been said before. He hopes the public will listen and understand—he wants to teach them, and he wants them to learn from him.
What visual artists like painters want to teach is easy to make out but difficult to explain, because painters translate their experiences into shapes and colors, not words. They seem to feel that a certain selection of shapes and colors, out of the countless billions possible, is exceptionally interesting for them and worth showing to us. Without their work we should never have noticed these particular shapes and colors, or have felt the delight which they brought to the artist.
Most artists take their shapes and colors from the world of nature and from human bodies in motion and repose; their choices indicate that these aspects of the world are worth looking at, that they contain beautiful sights. Contemporary artists might say that they merely choose subjects that provide an interesting pattern, that there is nothing more in it. Yet even they do not choose entirely without reference to the character of their subjects.
If one painter chooses to paint a gangrenous leg and another a lake in moonlight, each of them is directing our attention to a certain aspect of the world. Each painter is telling us something, showing us something, emphasizing something m all of which means that, consciously or unconsciously, he is trying to teach us.

The writer says that contemporary art contains ______ .

A.nothing but meaningless patterns

B.uninteresting aspects of the world

C.subjects chosen partly for their meaning

D.completely meaningless

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