(A)No country can indefinitely remain both economically efficient and politically stable.

(B)No country an indefinitely remain both politically unstable and wealthy.

(C)Economic efficiency is the indispensable precondition for the generation of wealth in a country

(D)Any country in which wealth is distributed equitably weill indefinitely remain politically stable.

(E)Growing economic efficiency encourages risk taking,which in turn leads to further growth in economic efficiency.

答案A

这个逻辑关系我有些弄不清楚，这个逆命题否命题逆否命题在这道题里怎么分析呀？

比较繁琐的推理，不知道有没有高人有更简洁的方法

economic efficiency —> wealth

politically stable-->equitable distribution of wealth

equitable distribution of wealth --> no risk taking

economic efficiency --> risk taking

no risk taking --> no economic efficiency

equitable distribution of wealth --> no economic efficiency

politically stable--> no economic efficiency

所以A项对

其他项同理推

risk is indispensable precondition of economic efficiency means economic efficiency requires risk taking

if A requires B, then A --> B. 因为B是A的必要条件