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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
参考答案
参考解析
解析：
名词辨析题。此处的by-products意为“副产品”，derivatives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原料，材料。chemical化学制品，化学药品。ingredient组成成分，要素。
名词辨析题。此处的by-products意为“副产品”，derivatives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原料，材料。chemical化学制品，化学药品。ingredient组成成分，要素。
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