【導讀】questions.waterontheearth?earthcooleddown.intooceansandseas.earthlike?(2)Whathappenednext?down?oflifeontheearth.thebeginningoflife?oceansandseas.waterappeared?aboutthelifeonland?appeared?solidball.appeared.water.ondryland.witha“BigBand”.直擊高考。earth.earth.foundhardtosolve.thepassage?Howdoestheuniverse(earth)form?