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生物碱的分类方法有数种，一按植物来源分类，二按生物碱生源途径分类，三按氮原子存在的主要杂环母核类型分类，现按已知生物碱主要母核分。

属于哌吡啶类生物碱有（）

A.毛果芸香碱

B.苦参碱

C.常山碱

D.去甲乌药碱

E.麻黄碱

答案

参考答案：B

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小题1:The change in climate may __________(影响) your health.

小题2:It is reported that only two people _______(幸存)the accident at last.

小题3:The ship _______(下沉)to the bottom of the sea after hitting an iceberg.

小题4:You've been working all morning---you __________(应得) a rest

小题5:He is good at ______(解决) this kind of problem.

小题6:The textbook c________ 10 units, including a mainly revision.

小题7:Our constitution (宪法)says that all men are e __________.

小题8:I would a________ it if you could help me with my English.

小题9:The teacher decided to d________ all his life to education.

小题10:In my o_________, I don’t agree with your plan.
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