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    【题目】据报道称：2050年1月1日，人类在距离地球50亿光年的地方，发现有与地球一样的存在生命的行星A。下列关于这颗“A”行星的叙述，可能性较少的是：（ ）

    A. 该行星表面应存在大气层

    B. 该行星的温度应能使水经常能处于液体状态

    C. 离该行星最近的恒星比较稳定

    D. 该行星应有象月球一样的卫星

    【答案】D

    【解析】2.试题分析：地球生命存在的条件有：外部条件：①太阳光照稳定（太阳没有明显变化）；②运行轨道安全（大、小行星公转各行其道、互不干扰，使地球处于比较安全的宇宙环境中）；内部条件：③地表温度适宜（日、地距离适中，自转周期不长不短）；④适合生物呼吸的大气（地球的体积和质量适中且原始大气经长期演化）；⑤有液态水（地球内部热量产生水汽，地球内部水汽逸出形成水圈）。是否有卫星与地球是否有生命影响不大，故选D。

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