单项选择题
A．To outline contrasting types of economy. B．To explain the science of economics. C．To argue for the superiority of one economics. D．To compare barter and money exchange markets.
A．the first word children learn in any language is "bread" B．the Phrygian language was the oldest in the world. C．the oldest word in any language is that of "bread" D．the Phrygian language was the easiest in the world to learn.
A．but B．if C．nearly D．fortunately