"This practice" in Paragraph 1 most probably refers to the fact that the middleman ______.

A．increases the prices in the shops

B．buys from you and sells to me

C．aims remarks at manufacturers

D．interferes with end user customers

中国对欧盟的竞争优势主要集中在机械设备和化工原料等技术密集型产品，而欧盟对中国的竞争优势主要集中在劳动密集型产品。