All the members of the WTO should follow the of trust and fair(公平) trade.
A. instructions
B. principles
C. orders
D. rules
网友回答
A. instructions
(答案→)B. principles
C. orders
D. rules
解析：考查名词：A. instructions说明B. principles原则C. orders订单，命令D. rules所有WTO的成员都要遵循信任公平交易的原则。选B。