下列可以利用物理性质区分的是（　　）

A．葡萄糖和蔗糖

B．棉线和羊毛线

C．碳酸钙粉末和碳酸钠粉末

D．电木和聚乙烯薄膜

Because of the rain, the sports meeting will be _____ two days.[ ]

A. put off

B. take off

C. taken off

D. took off