题目内容

【题目】“太阳大，地球小，地球绕着太阳跑；地球大，月球小，月球绕着地球跑。”重温童谣，据此回答下列各题。

【1】童谣中出现的天体，按照先后顺序排列正确的是 ( )

A．恒星、行星、卫星 B．星云、恒星、行星

C．恒星、行星、小行星 D．恒星、小行星、流星体

【2】童谣中出现的天体都属于( )

①太阳系 ②地月系 ③银河系 ④河外星系⑤总星系 ⑥宇宙

A．①②③④⑤⑥ B．①②③⑤⑥ C．①②④⑤ D．①③⑤⑥

【3】童谣中涉及的天体系统共有( )

A．一级 B．二级 C．三级 D．四级

【答案】

【1】A

【2】D

【3】 B

【解析】

试题分析：

【1】太阳属于恒星；地球属于行星，月球属于卫星，根据万有引力定律，质量小的围绕大的旋转。

【2】儿歌中反映月球绕转地球转，属于地月系，地月系属于太阳系，太阳系属于银河系，银河系属于总星系，即可见宇宙。

【3】 距离相近的天体因相互吸引和相互绕转，构成不同级别的天体系统，天体系统的层次为：最高一级为总星系（即目前所知的宇宙范围），第二级为银河系和河外星系（河外星系简称星系），银河系又向下分成第三级的太阳系及其他恒星系，太阳系向下分成最低一级的地月系和其他行星系。童谣中涉及的天体系统有太阳系、地月系。

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