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【单选题】

Basalt, (which )composes (most) of the ocean (floor), is a dark-grey rock (rich )in iron and magnesium than most surface rocks.

A、which
B．most
C．floor
D．rich
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根据网考网移动考试中心的统计，该试题：

6%的考友选择了A选项

4%的考友选择了B选项

4%的考友选择了C选项

86%的考友选择了D选项

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