夏令营的老师带领同学们再现了西周时期成千上万奴隶在一起耕作和

夏令营的老师带领同学们再现了西周时期成千上万奴隶在一起耕作和战国时期以个体家庭为单位生产的场景，这种耕作方式变化的主要原因是

A．商业的兴盛	B．水利工程的兴修
C．铁器、牛耕的使用和推广	D．劳动力的增加

答案

C解析:
略

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夏令营的老师带领同学们再现了西周时期成千上万奴隶在一起耕作和

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