单项选择题
The edge of a hurricane has overtaken your vessel in the Gulf of Mexico，and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the（）.
A.navigable semicircle B.dangerous semicircle C.low pressure area D.eye of the storm
单项选择题 The drift and set of tidal，river，and ocean currents refer to the（）.
单项选择题 The direction of the surface wind is（）.
单项选择题 The direction of the southeast trade winds is a result of the（）.
