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小学科学知识趣味学1：地球由什么组成
广阔的非洲大地上，一轮红日缓缓升起，叫醒了沉睡的动物们。一群小鸟飞过瀑布、高山和河流；羚羊在草场上欢快地奔跑；长颈鹿妈妈带着她的孩子缓缓爬上小丘；斑马和大象从湖泊穿过，溅起一路水花。 更多知识内容，欢迎关注微信公众号 科学嬉游记
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