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【单选题】

Useful drugs are made from inorganic substances or are plant and animal by-products.
A．materials

B．derivatives
C．chemicals
D．ingredients
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根据网考网移动考试中心的统计，该试题：

10%的考友选择了A选项

53%的考友选择了B选项

9%的考友选择了C选项

28%的考友选择了D选项

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