The main concern of the passage is with ______.

A．eventually solve the problem of city congestion
B．relieve the strain on the city facilities
C．decrease the land value in the town center
D．bring the same problem of congestion to the suburban areas

A．were more enthusiastic about the development of science and technology
B．had a stronger sense of beauty
C．over-dependent on labor saving devices
D．paid more attention to material benefits