Now Tom with his classmates ________ football on the playground.

A．play

B．are playing

C．plays

D．is playing

专门经营不再分装包装种子的门店，备案时除提供种子经营者名称、住所、经营方式、负责人、联系方式以及种子销售地点、品种名称、种子数量、种子来源等内容外，还应当提交那三个方面的材料？