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Useful drugs are made from inorganic substances or are plant and animal by-produ
Useful drugs are made from inorganic substances or are plant and animal by-produ
游客
2025-01-30
9
管理
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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