试题详情

Antarctic differs fundamentally from the Arctic regions.The Arctic is an ocean,（ ）with drifting packed ice and surrounded by the land masses of Europe,Asia,and North America.

中间一句说“北极是海洋”，后面又提到“浮水”一词，根据常识，我们知道浮冰是覆盖在水面上的，故正确答案应当是covered。