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　　A major theoretical issue is the relationship between productive slavery and the status of a society as a slave or a slave-owning society. In a slave society, slaves composed a significant portion (at least 20–30 percent) of the total population, and much of that society‘s energies were mobilized toward getting and keeping slaves. In addition the institution of slavery had a significant impact on the society‘s institutions, such as the family, and on its social thought, law, and economy. It seems clear that it was quite possible for a slave society to exist without productive slavery; the known historical examples were concentrated in Africa and Asia. It is also clear that most of the slave societies have been concentrated in Western (including Greece and Rome) and Islāmic civilizations. In a slave-owning society slaves were present, but in smaller numbers, and they were much less the focus of the society‘s energies.大家在进行托福备考的同时，如果对考位方面也比较紧张，可联系辛达代报为您服务