单选题 Dissatisfaction (with) the economic relationships (of) industrialized and less industrialized countries led to proposals (for) environmental (trade-offs).
【正确答案】 B
【答案解析】[解析] between…and…为固定用法，指“……和……之间”，句中指“工业国和新型工业国之间的经济关系”，因此把B项中的of改为between。