1. [单选题]吗啡急性中毒导致死亡的主要原因是（ ）。
A. 瞳孔极度缩小
B. 呼吸麻痹
C. 血压降低甚至休克
D. 昏迷
E. 支气管哮喘
2. [多选题]党参的横切面特征有( )
A. 木栓层(cork layer)外侧有石细胞
B. 韧皮部(phloem)散有乳管群
C. 形成层成环
D. 木质部中央有栓化细胞环
E. 薄壁细胞中含菊糖和少量的淀粉粒
3. [单选题]请根据以下内容回答 60～64 题
A. 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.
B. It grow horizontally， as a food-storing organ， beneath the surface of the ground， and enables a plant to reproduce itself.It has nodes， buds，and tiny leaves and does not die when cut； replanted， it yields new plant.
C. both A and B
D. neither A nor B
E. 第 60 题 一种起运输作用的器官是（ ）
