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【单选题】

The word "it" in line 21 refers to
A.( biological productivity

B.( oil
C.( organic material
D.( petroleum
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根据网考网移动考试中心的统计,该试题:

11%的考友选择了A选项

12%的考友选择了B选项

76%的考友选择了C选项

1%的考友选择了D选项

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