Which of the following statements best describes humor in China a. It is more or less the same in all parts of the country. b. It is drastically different in every part of the country. c. It is distinguished from Hong Kong. d. It is more a verbal act than a physical act in the north.

已知：2H₂(g)+O₂(g)=2H₂O(l) △H= -571.6 kJ/mol

CH₄ (g) +2O₂( g)=CO₂(g)+2H₂O(1) △H= - 890 kJ/mol

现有H₂与CH₄的混合气体112 L（标准状况），使其完全燃烧生成CO₂和H₂O(1)， 若实验测得反应放热3 695 kJ，则原混合气体中H₂与CH₄的物质的量之比是