GRE Text Completion: ETS Fundamental-GRE填空ETS基础 - 3X0VRY63QSE5J73KX

From the outset, the concept of freedom of the seas from the proprietary claims of nations was challenged by a contrary notion-that of the ____________ of the oceans for reasons of national security and profit. A. promotion B. exploration C. enclosure D. conservation E. surveying