单项选择题

The term flood current refers to that time when the water（）.

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

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单项选择题

A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current

单项选择题

A.the density of the water
B.the air temperature
C.the presence of a high pressure area near it
D.underwater soil conditions

单项选择题

A.density differences of the water
B.rotation of the earth
C.direction of primary circulation of air
D.all of the above