题目内容

【题目】太空中隐藏着无限的奥秘，人类对太空的探索越来越深入……回答下列各题。

【1】人类在探月过程中发现，月球表面覆盖着厚厚的月壤。月壤的形成主要是由于月球表面( )

A．平均温度过低 B．平均温度过高

C．温度变化无常 D．昼夜温差过大

【2】2018年我国将发射嫦娥4号飞行器，实现人类首次在月球背面软着陆。飞行器在月球表面会受到诸多来自宇宙空间的威胁，其中人类难以估计的威胁可能是月球表面( )

A．空气太稀薄 B．宇宙辐射太强

C．陨石撞击太多 D．月球引力太小

【答案】

【1】D

【2】C

【解析】

试题分析：

【1】人类在探月过程中发现，月球表面覆盖着厚厚的月壤，月壤的形成主要是由于没有大气，月球表面昼夜温差过大，地球表面的大气和水加剧了土壤的形成，月球表面没有大气，昼夜温差大，物理风化作用强，岩石主要是物理风化形成月壤，不同于地球土壤。

【2】月球表面是真空状态，没有大气的保护，月球表面损石撞击密集，对人类威胁大，地球的大气层可以抵挡直径小的陨石，月球却没有这层屏障，于是任何一颗陨石也会造成伤害。

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