The teacher asked the students to make their own ______in pairs. They can talk about anything they like.     [ ]

A. minds                        

B. conversations    

C. words                        

D. opinions

明清时期中国人数最多、实力最强的商人群体是 [ ]

A、粤商和徽商

B、徽商和晋商

C、闽商和粤商

D、台商和港商