单项选择题
On an Atlantic Ocean voyage from New York to Durban，South Africa，you should expect the Agulhas Current to present a strong（）.
A.offshore set B.onshore set C.head current D.fair or following current
单项选择题 Of the following，（）is not likely found in The Mariners Handbook.
单项选择题 Mean high water is the average height of（）.
单项选择题 Mariners not entering the port are（）to keep at least one mile off.
