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【多选题】
苦味药所含的主要成分是
A.
挥发油
B.
生物碱
C.
蛋白质
D.
苷类
E.
有机酸
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【简答题】Many animals hide(躲藏) to stay alive. They hide in many ways. Some animals hide in leaves; some animals hide in snow. Usually their colors or shapes(形状) help protect them. It’s hard to see an Arctic be...
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