正确答案: A

正确

题目：姜科和美人蕉科的花最美丽的部分是由雄蕊变态而来的。( )

解析：A

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举一反三的答案和解析：

[单选题]what was mrs.franks ding doing when the accident took place?

standing outside a bank

[单选题]菠萝果实顶端的叶丛称( )。

冠芽

[单选题]What do we know about the indian IT industry?

It is seeking further decelopment in China

[单选题]心皮是构成雌蕊的基本单位，是适应生殖的变态叶。( )

正确

[单选题]A wheelchair user may need help to enter ．

the House

[单选题]豌豆的卷须是小叶变态，属叶卷须。( )

正确

[单选题]由含有三个染色体组的生殖细胞直接发育的生物体为（ ）

单倍体