2. 医学
  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 by-product副产品，派生。
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