A．It is a double-edged sword.
B．It is a feature of a given culture.
C．It is a unique gift of human beings.
D．It is a result of both nature and nurture.
A．She is a tourist guide.
B．She is an interpreter.
C．She is a domestic servant.
D．She is from the royal family.
A．It is situated at the foot of a beautiful mountain.
B．It was used by the family to hold dinner parties.
C．It was frequently visited by heads of state.
D．It is furnished like one in a royal palace.