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【单选题】
吗啡属于下列哪类生物碱A.
苯丙胺类
B.
莨菪烷类
C.
异喹啉类
D.
吲哚类
E.
吡咯烷类
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【单选题】Although few would deny that it is better to be rich than poor, for some people the quest for money is so all-consuming that it extinguishes all other aspects of life. The cause of the urge to make en...
A.
is rooted in people's minds
B.
is pushed in America
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is considered unsocial
D.
varies with the individuals
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