胚珠生于花的哪一种结构里( )
A.雄蕊
B.雌蕊
C.子房
D.花药
花蕊是花的主要结构,雌蕊的结构包括柱头、花柱、子房,雄蕊由花丝和花药组成,胚珠生于雌蕊的子房中.
故选:B
— How was the televised NBA Total Finals last night?
— Super! Rarely _____ so much media attention. [ ]
A. a game attracted
B. did a game attract
C. a game did attract
D. attracted a game
环境与资源保护立法的指导原则