参考答案

正确答案：C
解析：细节题。文章第三段说明为什么在有些部落社会中会出现技术专业化。本段第三句说They don't specialize，as one might suppose，because certain raw materials happen to be available near particular village”，可见A错误；第五句说Everyone knows how to make pots，but not everybody does so，可见B错误；最后一句说Specialization contributes to keeping the peace，although it has not prevented intervillage warfare，可见D错误；本段倒数第二句说Such specialization promotes trade，which is the flint step in creating an alliance with enemy village，即这种专业化可以促进贸易，这是与敌对村落结盟的第一步，因此C为正确答案。