A．Awards vary in monetary value.
B．Ceremonies are held on December 10 to commemorate Nobel's invention.
C．Polities can play an important role in selecting the winners.
D．A few individuals have won two awards.

A．literature.
B．peace.
C．economics.
D．science.

A．Energy conservation.
B．Transportation of the future.
C．Strip cities.
D．Advantages of air transportation over railroads.