题目内容：
图1到图2的变化，反映我国古代农业生产中
A.铁犁牛耕的出现
B.耕犁技术的成熟
C.精耕细作的开始
D.单位亩产量提高
参考答案：
答案解析：
单选题：图1到图2的变化，反映我国古代农业生产中A.铁犁牛耕的出现B.耕犁技术的成熟 C.精耕细作的开始D.单位亩产量提高
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A.铁犁牛耕的出现
B.耕犁技术的成熟
C.精耕细作的开始
D.单位亩产量提高
A.铁犁牛耕的出现
B.耕犁技术的成熟
C.精耕细作的开始
D.单位亩产量提高
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