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

游客2023-12-31 20

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。

转载请注明原文地址:https://tihaiku.com/zcyy/3321437.html

相关试题推荐

随机试题

最新回复(0)

Almost______substancesexpandinvolumewhenheatedandcontractwhencooled.A