单项选择题

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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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

单项选择题

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