单项选择题
The movement of water away from the shore or downstream is called a(n)（）.
A.reversing current B.ebb current C.flood current D.slack current
单项选择题 The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.
单项选择题 The Humboldt Current flows in which direction?（）
单项选择题 The easiest way to anchor a vessel in a current is to（）.
