单项选择题
The set of the current is the（）.
A.speed of the current at a particular time B.maximum speed of the current C.direction from which the current flows D.direction in which the current flows
单项选择题 The Benguela Current flows in a（）.
单项选择题 Stand of the tide is that time when（）.
单项选择题 Spring tides are tides that（）.
