單項(xiàng)選擇題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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1.單項(xiàng)選擇題The steady current circling the globe at about 60°S is the().

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

2.單項(xiàng)選擇題The speed of an ocean current is dependent on().

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

3.單項(xiàng)選擇題The set of the ocean current is caused by().

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

4.單項(xiàng)選擇題The set of the equatorial countercurrent is generally to the().

A.north
B.east
C.southwest
D.northwest

5.單項(xiàng)選擇題The set of the current is the().

A.speed of the current at a particular time
B.maximum speed of the current
C.direction from which the current flows
D.direction in which the current flows