下列各种物质间的转换能通过一步反应实现的是 请选择DCBA9N:~1a;i0m1W(X7j'T;V3{(W
①P→P2O5;②SO3→H2SO4;③Fe2O3→FeCl2;④CH4→C(X7j'T;V3{(W
A.①②③(X7j'T;V3{(W
B.①③④(X7j'T;V3{(W
C.①②④(X7j'T;V3{(W
D.②③④(X7j'T;V3{(W