[题目]与地球上存在生命无关的因素是 ( )A．地球的体积和质量适中 B．地球附近大小行星各行其道.互不干扰C．日地距离适中.地表温度适宜 D．月球是地球的卫星题目和参考答案——青夏教育精英家教网—

题目内容

【题目】与地球上存在生命无关的因素是（）

A．地球的体积和质量适中

B．地球附近大小行星各行其道，互不干扰

C．日地距离适中，地表温度适宜

D．月球是地球的卫星

【答案】D

【解析】

试题分析：考查地球上存在生命的条件。地球上存在生命与地球处在安全的宇宙环境，地球本身有适宜的温度、大气、液态水有关。D项正确。故选D。

地球上存在生命的条件		形成生命条件的原因
外部条件	太阳光照稳定	太阳从诞生至今没有明显的变化
外部条件	运行轨道安全	地球附近的大、小行星各行其道、互不干扰
自身条件	有适宜的温度	日地距离适中，自转周期不长不短，使地球平均气温为15℃
	有适合生物呼吸的大气	地球的体积和质量适中，吸引气体形成大气层，并经过漫长的演化形成以氮和氧为主的大气
	有液态水	地球内部放射性元素衰变和原始地球体积收缩，产生热量，不断产生水汽，并随地球内部的物质运动带到地表，形成原始海洋

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