A. Electricians
B. Environmentalists
C. City planners
D. Television viewers
A. Skyscrapers provide more usable space than other buildings
B. The skyscrapers first appeared in the late 1960s
C. Where there are skyscrapers, television reception is poor
D. The two World Trade Center towers are skyscrapers
A. certain factors that determine the ease with which social changes occur
B. certain factors that promote social change
C. the necessity of social change
D. two different societies
A. joint interest
B. different points of view
C. less emotional people
D. advanced technology