The reason humans walk upright could be because of a series of apocalyptic lightning strikes caused by ancient star explosions millions of years ago, exciting new research suggests.
The reason humans walk upright could be because of a series of apocalyptic lightning strikes caused by ancient star explosions millions of years ago, exciting new research suggests.
Lisazhang1
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WoAiYM1314
The reason humans walk upright could be because of a series of apocalyptic lightning strikes caused by ancient star explosions millions of years ago, exciting new research suggests.
WoAiYM1314
The reason humans walk upright could be because of a series of apocalyptic lightning strikes caused by ancient star explosions millions of years ago, exciting new research suggests.
harriet_xk
老师讲得很清晰，对我的学习属于对症下药，感觉思维豁然开朗，感谢老师
英语大阅读 回复 @harriet_xk：
讲故事的小狮
好棒!