【名词&注释】
系统发育(phylogeny)
[单选题]姜科和兰科植物花的唇瓣都是由雄蕊变态而来。( )
A. 正确
B. 错误
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举一反三：
[单选题]从系统发育看，兰科植物的花原具( )枚雄蕊。
A. 3
B. 4
C. 5
D. 6
[单选题]
B． However
C． Therefore
D． Instead
A. RatherB． However
B. Therefore
C. Instead
[单选题]What is the message conveyed in the story?
A. Flowers are important for a date.B． Small talk is helpful.
B. Love and kindness are rewarding. D． Elderly people deserve respecting.
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