正确答案:

呼吸麻痹

B

题目：吗啡急性中毒导致死亡的主要原因是（ ）。

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延伸阅读的答案和解析：

[多选题]党参的横切面特征有( )

木栓层外侧有石细胞

韧皮部散有乳管群

形成层成环

薄壁细胞中含菊糖和少量的淀粉粒

解析：ABCE  [知识点] 根及根茎类中药——党参

[单选题]请根据以下内容回答 60～64 题

An organ of higher plants， usually subterranean and having several functions，including the absorption and conduction of water and dissolved minerals， food storage，and anchorage of the plant in the soil. It is distinguished from the stem by its structure，by the manner in which it is formed， and by the lack of such appendages as buds and leaves.

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