下列说法错误的是（  ）

A．牛奶富含蛋白质

B．蔬菜、水果富含维生素

C．为防止水产品变质，可用甲醛水溶液浸泡后出售

D．大米主要含淀粉，属于糖类

Because I’ll be very busy this weekend , I’m afraid I had to ____ to take part in the party

A．refuse

B．decline

C．deny

D．reject