第二段A possible explanation for this inconsistency is that legitimation and competitive forces transcend national boundaries, while studies typically restrict their analysis to the national level. 是研究限制了分析,而不是模型的问题。
最后一句。。。 finding that the model's operation is seen more clearly。所以是还是模型有用。选E
rate-high.
C指代不明 不是suppliers种植鱼naturally而是fish grow naturally