一朵花的主要部分是( )
A.花萼和花冠
B.花药和子房
C.花被和雌蕊
D.雄蕊和雌蕊
答案:D
— Which book could I take?
— Oh, you can take ____ of them. I'll keep none. [ ]
A.all
B.both
C.neither
D.either
按标号的顺序依次填出图中箭头所指为__________、___________、___________、___________、___________、___________。