A.black
B.setting
C.being
D.having
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A.falls／in
B.has been falling／on
C.has fallen／at
D.is falling／in
A.is flowing towards the land
B.is moving towards the ocean
C.level is not changing
D.level is rising because of heavy rains
A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current
A.the density of the water
B.the air temperature
C.the presence of a high pressure area near it
D.underwater soil conditions
A.density differences of the water
B.rotation of the earth
C.direction of primary circulation of air
D.all of the above
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Tide is（）in direction ENE.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
Neap tides occur when the（）.
The term flood current refers to that time when the water（）.
Which statement is TRUE concerning apogean tides（）．
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）
River currents tend to（）.
Neap tides occur（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
The set of the current is the（）.