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    【题目】绚烂的宇宙由天体和天体系统构成，半径约150亿光年，年龄约为137.5亿年。据此回答下列各题。

    【1】下列天体与我们的视觉对应正确的是( )

    A．星云——轮廓模糊

    B．行星——圆缺多变

    C．彗星——一闪即逝

    D．流星——拖着长尾

    【2】下列天体系统中，不包括月球的是( )

    A．总星系B．银河系C．太阳系D．河外星系

    【答案】

    【1】A

    【2】D

    【解析】

    试题分析：

    【1】星云是轮廓模糊，一闪即逝的是流星，行星是明亮的，圆缺多变的是月亮，彗星是拖着长尾的，距离太阳愈近，彗尾越长，月亮是圆缺多变的，轮廓模糊的是星云。

    【2】总星系包括银河系和河外星系，其中银河系包括太阳系，太阳系包括地月系，地月系中包括地球和月球，故河外星系不包括月球。

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