But a small segment of the urban society started to specialize in nonagricultural tasks as a result of the city's role as a regional center. Within the productive sector, there was a growth of a variety of specialist craftspeople. Early in the Uruk period, the use of undecorated utilitarian pottery was probably the result of specialized mass production.
定位句中：started to specialize in nonagricultural tasks 直接呼应选项：
People not needed for farming could perform other more specialized activities.
人们开始做一些不是农业的专门活动
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