- 问题详情:Nooneknowsexactlyhowtheearthbegan.However,accordingtoawidely__61_(accept)theory,itbaganwitha“BigBang”.Thentheearthexploded__62_(loud)andproducedwatervapourandmanygases,__63_(make)theearth’satmosphere.Andthenastheearthcooleddown,waterappear...
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