The pattern of China's foreign trade has changed substantially s

The pattern of China's foreign trade has changed substantially since the founding of the People's Republic.  (   )
A、model
B、structure
C、means
D、tradition
【正确答案】：A
【题目解析】：pattern意为”模式“；model模型，模范；structure结构；means方法；tradition传统；故选A。