A) 18 years old. B) 15 years old. C) 20 years old. D) 21 years old.

A. it lasts a long time
B. it happens very often
C. an earthquake on one side of the ocean can cause destruction on the other
D. it builds up high waves both in deep ocean and shallow seas

Advertisements helped to transform American values. They made Americans aware of such "problems" as halitosis (口臭) and strange smell of body. More seriously, they helped promote a shift from an emphasis on savings toward consumption. They also helped to shift from a culture mainly toward words to the one toward visual images.