【名词&注释】
维管束(vascular bundle)、双子叶植物(dicotyledon)、中柱鞘(pericycle)
[单选题]下列哪个结构不是双子叶植物茎初生结构的维管柱所具有的( )。
A. 维管束
B. 髓
C. 中柱鞘
D. 髓射线
查看答案&解析
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举一反三：
[单选题]What do we know about the girl?
A. She is new to the school,
B. She writes for the school newspaper.
C. She seldom asks questions in class.
[单选题]InParagraph2,theauthorusesjazzanexampleto
A. compareitwithrockmusic
B. showmusicidentifiesasociety
C. introduceAmericanmusicaltraditions
D. provemusicinfluencespeople’slifestyles
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