单项选择题
The height of a wave is the vertical distance（）.
A.from the still water plane to the crest
B.from the still water plane to the trough
C.from crest to trough
D.between water levels at one-quarter of the wave's length
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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（）.
A.position and area of the current
B.speed and direction toward which the current flows
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The direction of the surface wind is（）.
A.directly from high pressure toward low pressure
B.directly from low pressure toward high pressure
C.from high pressure toward low pressure deflected by the earth's rotation
D.from low pressure toward high pressure deflected by the earth's rotation
