A:钠熔成小球并在液面上四处游动
B:有气体产生
C:溶液底部有银白色物质生成
D:溶液变浑浊
He ____ (wake) up to find himself outside the house yesterday morning.
①Na2SO4+4C 高温__ Na2S+4CO↑;
②Na2SO4+4CO 高温__ Na2S+4CO2.