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【单选题】

One of the causes of ocean currents is density differences in the water. This is true because ().

A、in an area of high density the water's surface is lower than in an area of low density

B、surface water flows from an area of high density to one of low density

C、the lesser the density gradient the freer the water is to move

D、it is the density differences that cause the currents to stay in the troughs

更多“One of the causes of ocean currents is density differences in the water. This is true because ().”相关的问题
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