A. To outline contrasting types of economic systems. B. To explain the science of economics. C. To argue for the superiority of one economic system. D. To compare barter and money-exchange markets. 参考答案:A 答案解析:本题为细节归纳题。据第1段导入段及后面各段的内容可确定。
第27题: [单项选择]All expenses of Cargo-handling are(). A. To be accounted for the Charterers B. To be paid for the Charterers C. To be handled for the Charterers D. To be paid by the Charterers 参考答案:D