—No, you should ____ to bed now.
A:few, go
B:any , go
C:some, go
若x = (-2)×3,则x的倒数是 ( )
笛子是通过从吹孔向管内灌气引起空气柱 ____而发声的,演奏时,通过分别开闭六个音孔,笛子就能发出 ____(填“音调”、“响度”或“音色”)不同的声音.
读下列“山脉两侧的地形区”图,该山脉是( )