During the past years, intelligent technology has evolved (116) three generations. The first was characterized by tools such as prolog and OPS. prolog is a simple backward-chaining environment, and OPS is a simple forward-chaining environment. This led to the second generation of knowledge-engineering environments. Its goal was to model, prototype and construct (117) systems.
All three generations were oriented toward generic (118) and represented generalized implementation environments for the construction of expert systems. knowledge bases and AI applications.Some of the solution-oriented products are also seamlessly integrated with generic knowledge-engineering environments, permitting end users to add (119) rules and objects, as well as predefined knowledge-based logic to address problems in manufacturing simulation.Marketplace orientation is rapidly (120) toward solution-oriented intelligent product environments. the fourth generat
A. custom
B. knowledge
C. through
D. problemsolving
During the past 30 years or so, television has become a major agent of socialization(社交), often competing with parents and teachers. It occupies more of the working hours of American children, and so it is called "a member of the family". School age children watch television between seventeen and thirty hours a week. For preschool children it is often as high as fifty-four hours a week.
By the time the youngster graduates from high school, he or she will have spentroughly 11,000 hours in school compared to more than 22,000 hours in front of television. Children are not just watching children’s programs. On the contrary, the largest part of their viewing takes place between 8 and 11 p.m. Monday throughSaturday and between and 11 p.m. on Sunday.
However, 60% of mothers said they placed no "restrictions" on the amount oftime; they permitted their children to watch television. Teachers and parents have become increasingly concerned about the
A. children learn from it
B. children spend so much time on it
C. parents emphasize its importance by watching it at night
D. children do exactly what they are told on television
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