细胞核分裂时，染色体的变化最明显。组成染色体的物质是[ ]

A．糖类和蛋白质                

B．DNA和蛋白质

C．脂质和核酸                  

D．无机盐和DNA

— Could you please _____ your watch to me?

— OK. Here you are. [ ]

A. show

B. to show

C. showing