单项选择题
A.a current setting your vessel on the wall B.a current setting into the lock chamber C.an eddy working along the lower guide wall D.a current setting counterclockwise
A.spring，around late evening B.spring，around early evening C.fall，around early morning D.fall，around midday
A.is generated by waves striking the beach B.flows outside the surf zone C.flows in a circular pattern D.is also known as a longshore current