David Ricardo's theory of comparative advantage explains: 的比较优势理论解释道:
A.
domestic trade in terms of international differences in political environments.国内贸易在国际政治环境方面的差异。
B.
international trade in terms of international differences in political environments.国际贸易是指政治环境中的国际差异。
C.
domestic trade in terms of international differences in labor productivity.国内贸易按国际劳动生产率差异计算。
D.
international trade in terms of international differences in labor productivity.国际贸易是指国际间劳动生产率的差异。