有下列五个化学方程式(X、Y、Z均为正值):
①C2H2(g)+H2(g)C2H4(g)
②CH4(g)H2(g)+C2H4(g)
③C(s)+2H2(g)CH4(g);△H=-X kJ·mol—1
④C(s)+H2(g)C2H2(g);△H=-Y kJ·mol—1
⑤C(s)+H2(g)C2H4(g);△H=-Z kJ·mol—1
当温度下降时①式平衡向右移动,②式平衡向左移动。据此判定③—⑤式中关于X、Y、Z的大小顺序排列正确的是
A.X>y>Z | B.X>Z>Y | C.Y>X>Z | D.Z>X>Y |