The World Tourism Organization attempts to _________ tourist pol

The World Tourism Organization attempts to _________ tourist policies among nations through formulating and applying principles of international tourism.
A、make
B、raise
C、provide
D、harmonize
【正确答案】：D
【题目解析】：(P33)世界旅游组织试图制定并推行国际旅游业的原则，以此协调各国的旅游政策。