已知热化学方程式：
① C
2H
2(g) +
O
2(g) == 2CO
2(g)＋H
2O(l) ΔH
1＝-1301.0 kJ•mol
-1② C(s)+ O
2(g) == CO
2(g) △H
2＝-393.5 kJ•mol
-1③ H
2(g)+
O
2(g) == H
2O(1) △H
3 = -285.8 kJ·mol
-1则反应④ 2C(s)+ H
2(g) == C
2H
2(g)的△H为（ ）
A、+228.2 kJ·mol-1
B、-228.2 kJ·mol-1
C、+1301.0 kJ·mol-1
D、+621.7 kJ·mol-1
