A. The poor reception of radio and TV signals.
B. The removal of trees and grass from building sites.
C. The harmful effects on the city's plants.
D. The obstruction of air traffic.
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