世界海洋和陆地面积的比例约为( ) A．7：3 B．3：7

世界海洋和陆地面积的比例约为( )

A．7：3 B．3：7 C．6：4 D．4：6

答案

A．

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世界海洋和陆地面积的比例约为( ) A．7：3 B．3：7

答案

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