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【单选题】
The founders of the Chicago school of sociology, Robert Park and Ernest Burgess, attempted to develop a dynamic model of the city, one that would account not only for the expansion of cities in terms of population and territory but also for the patterns of settlement and land use within cities. They identified several factors that influence the physical form. of cities. As Park stated, among them are 'transportation and communication, tramways and telephones, newspapers and advertising, steel construction and elevators—all things, in fact, which tend to bring about at once a greater mobility and a greater concentration of the urban populations.' Paragraph 3 indicates that all of the following are true of 'natural areas' as conceived by Park and Burgess EXCEPT:A.
Use of the land in natural areas follows a consistent pattern but is generally unplanned.
B.
People living in natural areas tend to have much in common.
C.
Natural areas are usually protected from 'invasion' by people in other areas.
D.
Natural areas are an important basic component of the model Park and Burgess developed.
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举一反三
【单选题】在Flash中 ,( )的作用是设置对象运动路径的导向,使之相链接的被引导中的对象沿着路径运动,路径在播放动画时不显示。
A.
普通图层
B.
普通引导层
C.
运动引导层
D.
遮罩层