题目内容

胚囊母细胞减数分裂形成( )个大孢子，其中( )个发育成成熟胚囊。

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简述伞形花科植物的识别要点，列举5种常见植物。

多歧聚伞花序、单歧聚伞花序、二歧聚伞花序都属于( )花序。

The goals__________ he had fought ail his life no longer seemed important to him.

A. after which
B. with which
C. for which
D. at which

植物组织有哪几类？说明它们的形态特点、分布和功能。