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就整个地球大气来说，受热能量的根本来源是太阳辐射，太阳辐射被大气接收和转化的过程十分复杂，其加热大气的过程大致可以用下图表示。读图完成题。 小题1:下列描述正确的是 A．①——以长波辐射为主 B．②——是加热大气的主要直接热源 C．③——多云的夜晚辐射能力减弱 D．④——是加热大气的主要直接热源 小题2:低层大气的主要组成中，吸收④辐射的主要是 A．水汽和氧气 B．氮气和水汽 C．二氧化碳和水汽 D．氧气和氮气
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