正确答案: B

错误

题目：姜科和兰科植物花的唇瓣都是由雄蕊变态而来。( )

解析：B

查看原题

举一反三的答案和解析：

[单选题]从系统发育看，兰科植物的花原具( )枚雄蕊。

6

[单选题]

B． However C． Therefore D． Instead

Therefore

[单选题]What is the message conveyed in the story?

Love and kindness are rewarding. D． Elderly people deserve respecting.