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Evenbeforetherewerepeople,therewerecasesofairpollution....
问题详情:Evenbeforetherewerepeople,therewerecasesofairpollution.Therewereduststorms(沙尘暴).Volcanoeserupted,sendingashandpoisonousgasesintotheatmosphere.Whenpeopleappearedonthescene(登上历史舞台)andbe...