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【单选题】
从江侗乡位于贵州省东南部,其“稻鱼鸭系统”已有上千年历史。当地根据多山少地、降水充沛的自然条件,形成了在水稻“种植一季稻、放养一批鱼、饲养一群鸭”的农业生产方式。该耕作方式不使用农药、化肥。下图示意稻鱼鸭耕作模式及其农事安排。 据此完成 8 ~ 9 题。 8 .影响 “ 稻鱼鸭系统 ” 农业生产方式的主要自然条件是 ( )A.
．气温
B.
．地形
C.
．水源
D.
．土壤
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