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

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

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问题 Useful drugs are made from inorganic substances or are plant and animal by-products.
选项 A、materials
B、derivatives
C、chemicals
D、ingredients
答案B
解析 名词辨析A．materials原料，材料，物资，素材，布料；B．derivatives派生的事物，派生词；C．chemicals化学制品，化学药品；D．ingredients成分，因素；而by—products表示：副产品；因此B为答案。
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