A.heavy rain
B.heavy snow
C.thick fog
D.clearing skies
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A.draft
B.cutoff
C.draw
D.crossing
A.abyssal plain
B.continental shelf
C.borderland
D.offshore terrace
A.of the wave's crest
B.of the wave's trough
C.measured from crest to trough
D.measured from crest to crest
A.at right angles to the flow of the current
B.against the flow of the current
C.in the same direction as the flow of the current
D.over slack water
A.weak pressure gradients and light，variable winds
B.the formation of typhoons or hurricanes in certain seasons
C.steady winds in one direction for six months followed by wind reversal for the next six months
D.steady winds generally from the southeast in the Southern Hemisphere
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The horse latitudes are characterized by（）.
The apparent wind can be zero when the true wind is from（）.
A tide is called diurnal when（）.
The currents are（）mosoonal origin．
The direction of the southeast trade winds is a result of the（）.
Advection fog is most commonly caused by（）.
A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.
The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
The presence of stratus clouds and a dying wind will usually result in（）.