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结构化分析方法的基本思想是（）逐步求精。
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（D）Television will turn 86 years old on September 7, 2013, and it has never looked better. In its youth, television was a piece of furniture with a tiny, round screen showing unclear pictures of low-budget programs. In spite of its shortcomings, it became popular. Between 1950 and 1963, the number of American families with a television jumped from 9% to 92% of the population.As the audience got larger, the technology got better. Television sets became more reliable through the 1960s. Both of the reception and the picture improved. The major networks started broadcasting programs in color.Even greater improvements were coming according to Sanford Brown, who wrote an article for the Post in 1967. Surprisingly, just about every prediction he made in the article became a reality. For example: All sets in the not-distant future will be color instruments. He also predicted that TV sets would become smaller, simpler, more reliable and less expensive and may forever put the TV repairman out of work. Smaller sets do not, of course, mean smaller screens. TV engineers expect screens to get much bigger. However, today’s 3-D TV is even farther away, if it’s coming at all. There is some doubt whether the public would be eager to pay for it, in view of people’s cold reception given to 3-D movies.But the technology with the greatest potential, according to Brown, was cable television (有线电视), which was still in its early stages then. As he predicted, the future of cable television was highly interactive (互动的). It wasn’t cable television that gave Americans their electronic connection to the world, however. It was the Internet. He even foresaw the future office: using picture phones, big-screen televisions for conferences, and computers providing information, at the touch of a button.Brown ever said, “The future of television is no longer a question of what we can invent. It’s a question of what we want.” What is the text mainly about?（）
在模块结构图中，用来表示数据的图形符号是（）
最近,很多中学生都纷纷开通了自己的微博。一方面, 微博可以作为展示自己的平台，以释放学习的压力，因此已经被越来越多的中学生所接受。但是，另一方面，很多家长和老师都认为管理个人微博要花相当多的时间和精力，会耽误学习。请简要介绍这一现象，并发表自己的看法。注意:词数100左右。参考词汇：开微博 open one’s microblog 平台 platform释放压力 release one’s pressure 精力 energy
BSP法将企业数据分为四种类型，它们是（）
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