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【单选题】
地球上自有生命以来,其宇宙环境稳定的原因有 : 1太阳较稳定 2大行星及小行星的公转方向不同 3地球与太阳的距离适中 4九大行星的公转轨道面几乎在同一平面上
A.
①②
B.
①④
C.
②③
D.
③④
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