單格填空第 57 題
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.
| Blank |
|---|
| (A) promotion |
| (B) exploration |
| (C) surveying |
| (D) conservation |
| (E) appropriation |
出處：ETS website, #1