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问题 单项选择题

彩色视频信号的数字化过程中，图像的子采样技术通过减少（1）的采样频率来降低数据量。以下属于标准子采样方案的有（2），其中子采样方案（3）得到的数据量是相同的。①4：2：2②2：0：0③4：1：1④4：4：4⑤4：2：0 空白（3）处应选择（）

A.①和②

B.①和④

C.②和③

D.③和⑤

答案

参考答案：D

解析：

数字图像的颜色子采样技术是利用人眼对亮度分量的敏感程度远高于对颜色分量的敏感性这一生理特征，对彩色图像的颜色（色度、色差等）信号使用的采样频率低于对亮度信号使用的采样频率。这样的图像信号采样方式是一种简单、直观并且十分有效的图像数据压缩技术。

图像的颜色子采样方案其表示方法是使用对亮度和颜色信号的单位空间采样频率的比值来表示，数字图像采样通常在YCrCb颜色空间上实现，采用的采样方案包括4：2：2、4：1：1、4：2：0和4：4：4几种，其中4：1：1和4：2：0两种子采样方案的采样策略不同，但采样后的数据量是一样的。

阅读理解

阅读理解。

    Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine (酒)

and good food very much. Each time the rich man left his home, the servant would drink the wine and

eat up all the nice food in the house. The rich man knew what his servant did, but he had never caught

his servant doing that.

    One morning, when he left home, he said to the servant, "Here are two bottles of poison (毒药) and

some nice food in the house. You must take care of them." With these words, he went out.

    But the servant knew what the rich man had said was untrue (假的), after the rich man was away

from his home, he enjoyed a nice meal. Because he drank too much, he was drunk and fell to the ground.

When the rich man came back, he couldn't find his food and his wine. He became very angry. He woke

(叫醒) the servant up. But the servant told his story very well. He said a cat had eaten up everything. He

was afraid to be punished (被惩罚), so he drank the poison to kill himself.

1. In the story, _____ liked wine and good food very much. [ ]

A. the rich man

B. the servant

C. both A and B

D. neither A and B

2. The rich man knew that it was _____ that drank the wine and ate up all the nice food.[ ]

A. the cat

B. himself

C. nobody

D. the servant

3. The rich man told the servant that there was poison in the two bottles, because _____. [ ]

A. there was in fact poison in the bottles

B. he did not want the servant to drink his wine

C. he wanted to kill the cat

D. he wanted to kill the servant

4. In fact _____ ate all the nice food and drank the wine.[ ]

A. the servant

B. cat

C. the rich man

D. nobody

5. From the story, we know that the servant is very _____. [ ]

A. lazy

B. bad

C. clever

D. kind

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论述题

（30分）阅读材料，回答问题。

材料一          

图1  W省信息消费规模（亿元）             图2 W省信息消费占GDP的比重（%）

表1  2013年W省和其它国家、地区信息消费对比（美元）

 W省我国东部某发达省份美国日本
人均信息消费支出18062034002400
注：信息消费，是一种直接或间接以信息产品和信息服务为消费对象的消费活动。据测算，信息消费每增加100亿元，将带动国民经济增长338亿元。

（1）分析说明材料一蕴含的经济信息。（6分）

材料二 近几年，W省转变经济发展方式，大力发展信息产业，成效显著。在发展信息产业的过程中，W省压缩了部分造纸、采掘、制造等高能耗工业，农业和第三产业增长明显。数据显示，2013年，W省工业用水用电下降了32%，工业废水和废气排放量骤减，空气质量较往年有较大改善。为推动信息产业发展， W省吸引和培育了大批富有创造力和创新意识的人才。“网络到村、电话入户”工程极大地推进了W省城镇化进程，缩小了城乡差距。

（2）结合材料二，谈谈W省是怎样抓住“加快转变经济发展方式”这一主线的？（12分）

材料三  农业现代化成为“新四化”短板，核心原因是农业信息化建设仍然滞后，推进农业信息化已成为摆在政府面前的一大挑战。在W省，农业领域信息化发展存在的问题主要有三个：一是农村信息资源开发利用的基础设施薄弱；二是许多农民科学文化素质较低，难以有效利用各种信息化工具；三是城乡之间存在“数字鸿沟”，信息类企业在农村发展较慢，信息技术应用严重滞后。

（3）结合材料三，运用《政治生活》知识，说明W省政府在推进农业信息化方面应该怎样有所作为？（12分）
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