Answer: d

Analysis on the different organizational structures of the four major exchanges in China. Among them, Shanghai Futures Exchange, Zhengzhou Commodity Exchange and Dalian Commodity Exchange are member futures exchanges, and China Financial Futures Exchange is the company futures exchange. The general meeting is composed of all members of the membership-based futures exchange and is the highest authority of the membership-based futures exchange. Membership futures exchanges are usually not for profit; Enterprise futures exchanges usually aim at profit and pursue the maximization of exchange profits. The main varieties listed and traded in Zhengzhou Commodity Exchange are cotton, sugar, PTA, rapeseed oil, wheat, early indica rice and methanol futures.