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

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

选项 A、materials
B、derivatives
C、chemicals
D、ingredients

答案B

解析 此处的by-product意为“副产品”,derivative意为“派生的事物”,可以引申为“派生产品,衍生产品”,符合题意,所以选B;material(材料);chemical(化学制品,化学药品);ingredient(组成成分,要素)。
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