TOEFL Reading: ETS-TOEFL阅读机经 - NE1K0D58333P9H4PL$

According to paragraph 5, all of the following are true of the first civilizations EXCEPT: A. Their soldiers and priests also worked as farmers. B. Their populations were divided into different social classes. C. They had developed technologies for working with metals. D. They were typically administered from large cities.