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【单选题】

How did the science of preparing metals for use happen
A.By any planned purpose.

B.By chance.
C.With fire.
D.On the part of those who were concerned about it.
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根据网考网移动考试中心的统计,该试题:

28%的考友选择了A选项

70%的考友选择了B选项

1%的考友选择了C选项

1%的考友选择了D选项

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