In 1969, the Who produced ________, an album that is considered to be the first "rock opera."

The temples of Angkor Wat have remained in relatively good condition in recent centuries because __________

A. it was overgrown and hidden by the jungle B. it has often been occupied by Buddhist monks C. it was protected by French occupying forces D. it has never been the site of war

The use of red and green at Christmas is an example of ____ colors

a. complementary b. accent c. keystone d. subtractive