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單項選擇題

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

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單項選擇題

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

單項選擇題

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

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