What is the main difference between the economies of china and north korea?
a. north korea is not centrally planned.
b. north korea is privatizing businesses.
c. china is privatizing businesses.
d. china is not centrally planned.

Why are slanted roofs found on many buildings within russia and finland? a. to prevent ice slides. b. to prevent the build-up of water during heavy rains. c. to prevent heat from escaping during the clod winter months. d. to prevent snow build-up.