单项选择题
The Benguela Current flows in a（）.
A.SW'ly direction along the NW coast of Africa B.S'ly direction off the East Coast of Australia C.NW'ly direction along the SW coast of Africa D.SW'ly direction along the SE coast of Greenland
单项选择题 Swell is the rise and fall of the ocean’s surface due to（）.
单项选择题 Stand of the tide is that time when（）.
单项选择题 Spring tides occur（）.
