题目内容
In 1997, devotees of home electronics eagerly awaited the DVD player, a new device that could play movies without videotape, and with greater clarity. It caught on even faster than CD music players and within four years, DVD movies surpassed VHS tapes in sales. The DVDs success is just one example of a historic shift from analog to digital technologies. They began with computing and are now spreading to industries from banking to publishing. Products and services are shedding the limits of their physical form to become encoded information that never degrades, can be reproduced perfectly and distributed around the world in minutes, or less. Another example is photography: by the end of this year, the number of images captured digitally each day is expected to surpass the number of images captured on film. With digital cameras and other devices linked to personal computers, we can collect vast amounts of data, which fortunately takes up little or no closet space. Today’’s average personal computer has a hard drive that can store 300 times more information than a decade ago. Technologies, such as broadband e-commerce, are expected to be the primary means of delivering entertainment and media by the end of this decade. Even life itself is increasingly digitized. The human genome, the recipe for our genetic makeup, has been mapped and encoded and researchers are harnessing the power of computing to accelerate the development of new, lifesaving drugs. The implications of this broad, digital revolution are enormous, although they tend to be over-shadowed by the struggles of high-tech industries to recover from the go-go years of the 1990s. Those struggles are real, yet there are reasons for optimism about a return to robust economic growth and job creation in the next several years. The digital innovations(创新)of the past two decades continue to bear fruit, so stay tuned for good news--digitally, of course. The author implies that excitement over the digital revolution may be hindered by _______.
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系统分析包括目标分析、环境分析、业务分析、数据分析和效益分析等内容，其主体内容是______。
BSP方法在实施其主要研究活动时，最基础的活动应是定义______和数据类。
One of the earliest changes experienced by newly modernizing countries is the reduction of infectious disease through the diffusion of public health technology. Public health technology lowers the death rate, especially among infants and children, causing rapid population growth. Since most of the people of less developed nations live in rural areas that cannot absorb the increased population, unemployment presses people off the land. They tend to migrate into urban areas where newly developing industry and commerce and modern consumer goods and services offer hope for employment and a better life. Unfortunately, the opportunities are more apparent than real; and often the transition is more painful than pleasant.In the courses of the transition from agrarian life to modern urban living, the family undergoes major changes in function, structure, relations, and style. Functionally the family changes from a production unit to a consumption unit. No longer is there need for a large multi-worker household to operate the family’s farm interests, and the extended family household changes to the one containing only a core nuclear family. In the city children become economic liabilities rather than economic assets, and eventually families have fewer of them. Wives lose their functions as producers and maintainers of the labor force and become free to pursue extra household activities.The modern economy forces work outside the home away from kinfolk. Not only the father but also the mother is forced into the marketplace or factory to obtain enough money for the family to survive in a pecuniary economy. Without the extended family household, no one remains at home to supervise children, so they are left on their own. They may be sent into the streets to earn money. Daily life becomes filled with more secondary than primary relations. There is an erosion of family control over individual members.Scarce urban housing forces overcrowding in both dwelling and neighborhood. Dense structures with common halls, stairways, and utilities cause more intensive contact with neighbors than in rural villages. Loss of rural courtyards, over rooms, and large family areas drives group activities such as cooking, eating, and sitting into small rooms or city streets. More positively, household furnishings change as families are able to acquire the high-status accoutrements of modern living such as kerosene burners for cooking ( replacing dung cakes) and beds (instead of mats). The first sentence of Paragraph 3, "The modern economy forces work outside the home away from kinsfolk" means that（）
结构化设计的总体设计用______来实现对系统或子系统的划分。
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