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【单选题】

Science is still ______ of the causes of many kinds of cancer.

A．ignorant

B．unconscious
C．conscious
D．informed

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根据网考网移动考试中心的统计，该试题：

88%的考友选择了A选项

9%的考友选择了B选项

2%的考友选择了C选项

1%的考友选择了D选项

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