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

游客2025-01-28 32

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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