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【题目】2010年元旦过后,美国科幻大片《阿凡达》在我国上映。影片讲述人类试图从极遥远的潘多拉星球(距离太阳大约4.4亿光年)开采矿产以解决地球的能源危机而与纳美人(潘多拉星球上的土著人类)发生一系列矛盾冲突。回答下列问题。

【1】假如影片中潘多拉星球在宇宙中是存在的,那么它不可能属于

A.总星系 B.银河系 C.河外星系 D.太阳系

【2】影片中地球人在潘多拉星球行动时需要带氧气罩,证明其大气不适合人类呼吸,适合生物呼吸的大气是地球上存在生命的重要条件之一,下列叙述与地球大气有密切关系的是

A.地球的质量与体积适中 B.地球的昼夜更替周期适中

C.地球与太阳的距离比较适中 D.地球自转周期适中

【答案】

【1】D

【2】A

【解析】

试题分析:

【1】根据天体系统的层次关系:最低一级的天体系统是地月系,较地月系高一级的天体系统是太阳系,比太阳系再高一级的天体系统为银河系和河外星系,最高一级的天体系统为总星系.潘多拉星球距离太阳约4.4亿光年,说明他不属于太阳系,银河系系主体部分的直径约为8万光年,说明它可能在银河系的范围内,它可能属于河外星系,总星系是可见宇宙,该星球属于总星系。故选D。

【2】地球的质量体积适中使得地球有合适的大气厚度和大气成分,A对。地球的昼夜更替周期适中使地球的昼夜温差适中,B错。地球与太阳的距离比较适中,使得地球有适宜生物生存的温度范围,C错。地球自转周期适中,与大气产生无关,D错。故选A。

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