A、discuss the advantages and disadvantages of skyscrapers
B、compare skyscrapers with other modern structures
C、describe skyscrapers and their effect on the environment
D、illustrate various architectural designs of skyscrapers
21.Singapore is a small state in the southeast of Asia22.According to the constitution of Singapore, the president of the state is selected23.Compared with people in other Asian countries, the Singapore24.Several technical colleges, and a teachers college are part of25.Though small, Singapore has an industry of its own and canA.live a better lifeB.made up of more than 50 islandsC.Higher education instituteD.not by the Parliament, but by the peopleE.produce goods of various kindsF.have a big population
According to the passage, which aspect of skyscrapers were some residents of North America concerned with in the late1960's?
A、The poor reception of radio and TV signals.
B、The removal of trees and grass from building sites.