37. When two chemical compounds are combined, a ______ effect can be achieved: the resulting combination can be more potent than either of the individual compounds alone.
A. synergistic
B. naturalistic
C. competitive
D. retroactive
E. neutralizing

38. Artists who are described as ______ are the first to experiment with new forms or concepts.
A. aesthetic
B. partisan
C. decorous
D. cerebral
E. avant-garde