Students in English-speaking countries usually address their man teacher ‘sir”, but __________ their woman teacher “madam”.

A．seldom they address

B．do they seldom address

C．seldom do they address

D．they seldom do address

电子商务物流柔性化的含义是（）

A.物流配送中心能根据消费者的需求变化灵活组织和实施物流作业

B.物流配送中采用自动分拣系统和人工分拣系统相结合

C.物流信息传递的标准化和实时化相结合

D.物流配送中心经营管理的决策支持与标准化支持